On quiver W-algebras and defects from gauge origami
Publication date: Available online 14 November 2019Source: Physics Letters BAuthor(s): Peter KoroteevAbstractIn this note, using Nekrasov's gauge origami framework, we study two different versions of the BPS/CFT correspondence – first, the standard AGT duality and, second, the quiver W algebra construction which has been developed recently by Kimura and Pestun. The gauge origami enables us to work with both dualities simultaneously and find exact matchings between the parameters. In our main example of an A-type quiver gauge theory, we show that the corresponding quiver qW-algebra and its representations are closely ...
Source: Physics Letters B - November 16, 2019 Category: Physics Source Type: research

Thick brane in mimetic f(T) gravity
Publication date: Available online 14 November 2019Source: Physics Letters BAuthor(s): Wen-Di Guo, Yi Zhong, Ke Yang, Tao-Tao Sui, Yu-Xiao LiuAbstractWe apply the mimetic f(T) theory into the thick brane model. We take the Lagrange multiplier formulation of the action and get the corresponding field equations of motion. We find solutions for different kinds of f(T). Besides, we investigate the stability of the mimetic f(T) brane by considering the tensor perturbations of the vielbein. Localization problem is also studied and it is shown that the four-dimensional gravity can be recovered for all the solutions. The effects o...
Source: Physics Letters B - November 16, 2019 Category: Physics Source Type: research

Five-loop static contribution to the gravitational interaction potential of two point masses
Publication date: Available online 14 November 2019Source: Physics Letters BAuthor(s): J. Blümlein, A. Maier, P. MarquardAbstractWe compute the static contribution to the gravitational interaction potential of two point masses in the velocity-independent five-loop (and 5th post-Newtonian) approximation to the harmonic coordinates effective action in a direct calculation. The computation is performed using effective field methods based on Feynman diagrams in momentum-space in d=3−2ε space dimensions. We also reproduce the previous results including the 4th post-Newtonian order. (Source: Physics Letters B)
Source: Physics Letters B - November 16, 2019 Category: Physics Source Type: research

Fine structure in the α decay of 223U
Publication date: Available online 14 November 2019Source: Physics Letters BAuthor(s): M.D. Sun, Z. Liu, T.H. Huang, W.Q. Zhang, A.N. Andreyev, B. Ding, J.G. Wang, X.Y. Liu, H.Y. Lu, D.S. Hou, Z.G. Gan, L. Ma, H.B. Yang, Z.Y. Zhang, L. Yu, J. Jiang, K.L. Wang, Y.S. Wang, M.L. Liu, Z.H. LiAbstractFine structure in the α decay of 223U was observed in the fusion-evaporation reaction 187Re(40Ar, p3n) by using fast digital pulse processing technique. Two α-decay branches of 223U feeding the ground state and 244 keV excited state of 219Th were identified by establishing the decay chain 223U →α1 219Th &rarr...
Source: Physics Letters B - November 16, 2019 Category: Physics Source Type: research

Free-fall Rainbow BTZ Black Hole
Publication date: Available online 15 November 2019Source: Physics Letters BAuthor(s): Benrong Mu, Jun Tao, Peng WangAbstractIn this paper, we investigate properties of rainbow BTZ black holes in the scenario with the free-fall (FF) orthonormal frame. After the FF rainbow BTZ metric is obtained, the Hawking temperature is calculated via the Hamilton-Jacobi method, and the thermodynamic properties are discussed. For radiated particles with a subluminal modified dispersion relation, we find that the effects of rainbow gravity tend to increase the Hawking temperature but decrease the black hole entropy. However, it shows that...
Source: Physics Letters B - November 16, 2019 Category: Physics Source Type: research

Post-Minkowskian Hamiltonians in modified theories of gravity
Publication date: Available online 13 November 2019Source: Physics Letters BAuthor(s): Andrea CristofoliAbstractThe aim of this note is to describe the computation of post-Minkowskian Hamiltonians in modified theories of gravity. Exploiting a recent relation between scattering amplitudes of massive scalars and potentials for relativistic point-particles we derive a contribution to post-Minkowskian Hamiltonians at second order in the Newton's constant coming from R3 modifications in General Relativity. Using this result we calculate the associated contribution to the scattering angle for binary black holes at second post-Mi...
Source: Physics Letters B - November 15, 2019 Category: Physics Source Type: research

Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fb−1 of pp collisions at s=13TeV with the ATLAS experiment
Publication date: Available online 13 November 2019Source: Physics Letters BAuthor(s): G. Aad, B. Abbott, D.C. Abbott, A. Abed Abud, K. Abeling, D.K. Abhayasinghe, S.H. Abidi, O.S. AbouZeid, N.L. Abraham, H. Abramowicz, H. Abreu, Y. Abulaiti, B.S. Acharya, B. Achkar, S. Adachi, L. Adam, C. Adam Bourdarios, L. Adamczyk, L. Adamek, J. AdelmanAbstractA search for flavour-changing neutral current (FCNC) events via the coupling of a top quark, a photon, and an up or charm quark is presented using 81 fb−1 of proton–proton collision data taken at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC. Ev...
Source: Physics Letters B - November 15, 2019 Category: Physics Source Type: research

Instability of Higgs vacuum via string cloud
Publication date: Available online 13 November 2019Source: Physics Letters BAuthor(s): Issei Koga, Sachiko Kuroyanagi, Yutaka OokouchiAbstractWe study the instability of the Higgs vacuum caused by a cloud of strings. By catalysis, the decay rate of the vacuum is highly enhanced and, when the energy density of the cloud is larger than the critical value, a semi-classical vacuum decay occurs. We also discuss the relation between the string cloud and observational constraints on the cosmic strings from the viewpoint of the catalysis, which are converted into bounds on the parameters of the Higgs potential. (Source: Physics Letters B)
Source: Physics Letters B - November 15, 2019 Category: Physics Source Type: research

Towards massless sector of tensionless strings on AdS5
Publication date: Available online 13 November 2019Source: Physics Letters BAuthor(s): Alexey Sharapov, Evgeny Skvortsov, Tung TranAbstractA Higher Spin Gravity in five dimensions is constructed. It was shown recently that constructing formally consistent classical equations of motion of higher spin gravities is equivalent to finding a certain deformation of a given higher spin algebra. A strong homotopy algebra encoding the interaction vertices then follows. We propose two different and novel realizations of the deformed higher spin algebra in the case of five dimensions: one in terms of the universal enveloping algebra o...
Source: Physics Letters B - November 15, 2019 Category: Physics Source Type: research

Multiplicity dependence of light (anti-)nuclei production in p–Pb collisions at sNN=5.02 TeV
Publication date: Available online 23 October 2019Source: Physics Letters BAuthor(s): S. Acharya, D. Adamová, S.P. Adhya, A. Adler, J. Adolfsson, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S. Ahmad, S.U. Ahn, A. Akindinov, M. Al-Turany, S.N. Alam, D.S.D. Albuquerque, D. Aleksandrov, B. Alessandro, H.M. Alfanda, R. Alfaro MolinaAbstractThe measurement of the deuteron and anti-deuteron production in the rapidity range −1
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Configurational entropy and instability of tachyonic braneworld
Publication date: Available online 23 October 2019Source: Physics Letters BAuthor(s): Chong Oh LeeAbstractWe consider tachyonic braneworld with a bulk cosmological constant and investigate a configurational entropy of various magnitudes of scale factor. It is found that for a bulk negative/zero cosmological constant, the configurational entropy has a global minimum when the magnitude of scale factor reaches the critical value. This result seems to have intriguing implications such that an accelerated rate of the universe and cosmological inflation rate for radiation/matter domination are able to be determined by such criti...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Observation of nuclear modifications in W± boson production in pPb collisions at sNN=8.16TeV
Publication date: Available online 24 October 2019Source: Physics Letters BAuthor(s): A.M. Sirunyan, A. Tumasyan, W. Adam, F. Ambrogi, E. Asilar, T. Bergauer, J. Brandstetter, M. Dragicevic, J. Erö, A. Escalante Del Valle, M. Flechl, R. Frühwirth, V.M. Ghete, J. Hrubec, M. Jeitler, N. Krammer, I. Krätschmer, D. Liko, T. Madlener, I. MikulecAbstractThe production of W± bosons is studied in proton-lead (pPb) collisions at a nucleon-nucleon centre-of-mass energy of sNN=8.16TeV. Measurements are performed in the W±→μ±νμ channel using a data sample corresponding to an integrated...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Pion valence quark distributions from maximum entropy method
Publication date: Available online 31 October 2019Source: Physics Letters BAuthor(s): Chengdong Han, Hanyang Xing, Xiaopeng Wang, Qiang Fu, Rong Wang, Xurong ChenAbstractValence quark distributions of pion at very low resolution scale Q02∼0.1 GeV2 are deduced from a maximum entropy method, under the assumption that pion consists of only a valence quark and a valence anti-quark at such a low scale. Taking the obtained initial quark distributions as the nonperturbative input in the modified Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (with the GLR-MQ-ZRS corrections) evolution, the generated valence quark distribution fun...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Spectroscopy, lifetime and decay modes of the Tbb− tetraquark
We report accurate solutions of the four-body problem in a quark model, characterizing the structure of the state as a function of the ratio MQ/mq of the heavy to light quark masses. For such a standard constituent model, Tbb− lies approximately 150 MeV below the strong decay threshold B−B⁎¯0 and 105 MeV below the electromagnetic decay threshold B−B¯0γ. We evaluate the lifetime of Tbb−, identifying the promising decay modes where the tetraquark might be looked for in future experiments. Its total decay width is Γ≈87×10−15 GeV and therefore its lifetime τ...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Parametric correlations in energy density functionals
Publication date: Available online 31 October 2019Source: Physics Letters BAuthor(s): A. Taninah, S.E. Agbemava, A.V. Afanasjev, P. RingAbstractParametric correlations are studied in several classes of covariant density functional theories (CDFTs) using a statistical analysis in a large parameter hyperspace. In the present manuscript, we investigate such correlations for two specific types of models, namely, for models with density dependent meson exchange and for point coupling models. Combined with the results obtained previously in Ref. [1] for a non-linear meson exchange model, these results indicate that parametric co...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Beam-beam effects on the luminosity measurement at LEP and the number of light neutrino species
Publication date: Available online 31 October 2019Source: Physics Letters BAuthor(s): Georgios Voutsinas, Emmanuel Perez, Mogens Dam, Patrick JanotAbstractIn e+e− collisions, electromagnetic effects caused by large charge density bunches modify the effective acceptance of the luminometer system of the experiments. These effects consequently bias the luminosity measurement from the rate of low-angle Bhabha interactions e+e−→e+e−. Surprisingly enough, the magnitude of this bias is found to yield an underestimation of the integrated luminosity measured by the LEP experiments by about 0.1%, significantly...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Searches for lepton-flavour-violating decays of the Higgs boson in s=13 TeV pp collisions with the ATLAS detector
Publication date: Available online 4 November 2019Source: Physics Letters BAuthor(s): G. Aad, B. Abbott, D.C. Abbott, A. Abed Abud, K. Abeling, D.K. Abhayasinghe, S.H. Abidi, O.S. AbouZeid, N.L. Abraham, H. Abramowicz, H. Abreu, Y. Abulaiti, B.S. Acharya, B. Achkar, S. Adachi, L. Adam, C. Adam Bourdarios, L. Adamczyk, L. Adamek, J. AdelmanAbstractThis Letter presents direct searches for lepton flavour violation in Higgs boson decays, H→eτ and H→μτ, performed with the ATLAS detector at the LHC. The searches are based on a data sample of proton–proton collisions at a centre-of-mass energy s=13 TeV,...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Unitary matrix with a Penner-like potential also yields Nf = 2
Publication date: Available online 6 November 2019Source: Physics Letters BAuthor(s): Shun'ya Mizoguchi, Hajime Otsuka, Hitomi TashiroAbstractIt has been known for some time that a hermitian matrix model with a Penner-like potential yields as its large-N free energy the prepotential of N=2 Nf=2 SU(2) SUSY gauge theory. We give a rigorous proof that a unitary matrix model with the identical potential also yields the same prepotential, although the parameter identifications are slightly different. This result has been anticipated by Itoyama et al. (Source: Physics Letters B)
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Gravitational wave denoising of binary black hole mergers with deep learning
Publication date: Available online 6 November 2019Source: Physics Letters BAuthor(s): Wei Wei, E.A. HuertaAbstractGravitational wave detection requires an in-depth understanding of the physical properties of gravitational wave signals, and the noise from which they are extracted. Understanding the statistical properties of noise is a complex endeavor, particularly in realistic detection scenarios. In this article we demonstrate that deep learning can handle the non-Gaussian and non-stationary nature of gravitational wave data, and showcase its application to denoise the gravitational wave signals generated by the binary bl...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Double D-meson production in proton-proton and proton-lead collisions at the LHC
Publication date: Available online 6 November 2019Source: Physics Letters BAuthor(s): Ilkka Helenius, Hannu PaukkunenAbstractWe consider the simultaneous production of two heavy-flavoured hadrons – particularly D mesons – at the LHC. We base our calculations on collinearly factorized QCD at next-to-leading order, using the contemporary parton distribution functions and D-meson fragmentation functions. The contributions of double-parton scatterings are included in the approximation of independent partonic interactions. Our framework benchmarks well with the available proton-proton data from the LHCb collaboratio...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

The number of sufficient and necessary conditions for CP conservation with Majorana neutrinos: Three or four?
Publication date: Available online 6 November 2019Source: Physics Letters BAuthor(s): Bingrong Yu, Shun ZhouAbstractAs is well-known, there exist totally three CP-violating phases in the leptonic sector if three ordinary neutrinos are massive Majorana particles. In this short note, we raise the question whether the number of sufficient and necessary conditions for CP conservation in the leptonic sector with massive Majorana neutrinos is three or four. An intuitive answer to this question would be three, which is also the total number of independent CP-violating phases. However, we give a counter example, in which three con...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Search for light pseudoscalar boson pairs produced from decays of the 125 GeV Higgs boson in final states with two muons and two nearby tracks in pp collisions at s=13TeV
Publication date: Available online 8 November 2019Source: Physics Letters BAuthor(s): A.M. Sirunyan, A. Tumasyan, W. Adam, F. Ambrogi, E. Asilar, T. Bergauer, J. Brandstetter, M. Dragicevic, J. Erö, A. Escalante Del Valle, M. Flechl, R. Frühwirth, V.M. Ghete, J. Hrubec, M. Jeitler, N. Krammer, I. Krätschmer, D. Liko, T. Madlener, I. MikulecAbstractA search is presented for pairs of light pseudoscalar bosons, in the mass range from 4 to 15 GeV, produced from decays of the 125 GeV Higgs boson. The decay modes considered are final states that arise when one of the pseudoscalars decays to a pair of tau leptons, ...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Initial transverse-momentum broadening of Breit-Wheeler process in relativistic heavy-ion collisions
Publication date: Available online 8 November 2019Source: Physics Letters BAuthor(s): W. Zha, J.D. Brandenburg, Z. Tang, Z. XuAbstractWe calculate the cross section and transverse-momentum (P⊥) distribution of the Breit-Wheeler process in relativistic heavy-ion collisions and their dependence on collision impact parameter (b). To accomplish this, the Equivalent Photon Approximation (EPA) was generalized in a more differential way compared to the approach traditionally used for inclusive collisions. In addition, a lowest-order QED calculation with straightline assumption was performed as a standard baseline for compari...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Quenching of gA deduced from the β-spectrum shape of 113Cd measured with the COBRA experiment
Publication date: Available online 12 November 2019Source: Physics Letters BAuthor(s): Lucas Bodenstein-Dresler, Yingjie Chu, Daniel Gehre, Claus Gößling, Arne Heimbold, Christian Herrmann, Rastislav Hodak, Joel Kostensalo, Kevin Kröninger, Julia Küttler, Christian Nitsch, Thomas Quante, Ekaterina Rukhadze, Ivan Stekl, Jouni Suhonen, Jan Tebrügge, Robert Temminghoff, Juliane Juliane, Stefan Zatschler, Kai ZuberAbstractA dedicated study of the quenching of the weak axial-vector coupling strength gA in nuclear processes has been performed by the COBRA collaboration. This investigation is driven by n...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Neutrino oscillations in Unruh radiation
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): M. Blasone, G. Lambiase, G.G. Luciano, L. PetruzzielloAbstractThe study of the decay of an accelerated proton recently provided a “theoretical proof” of the Unruh effect. On the basis of general covariance of Quantum Field Theory, indeed, it was found that the decay rates in the inertial and comoving frames do coincide only when the thermal nature of the accelerated vacuum is taken into account. Such an analysis was then extended to the case with mixed neutrinos. In this paper, we show that, by further embedding neutrino oscillatio...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Search for compact dark matter objects in the solar system with LIGO data
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): C.J. Horowitz, M.A. Papa, S. ReddyAbstractDark matter could be composed of compact dark objects (CDOs). A close binary of CDOs orbiting in the interior of solar system bodies can be a loud source of gravitational waves (GWs) for the LIGO and VIRGO detectors. We perform the first search ever for this type of signal and rule out close binaries, with separations of order 300 m, orbiting near the center of the Sun with GW frequencies (twice the orbital frequency) between 50 and 550 Hz and CDO masses above ≈10−9M⊙. This mass limit is ...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Search for direct production of the f1(1285) resonance in e+e− collisions
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): M.N. Achasov, A.Yu. Barnyakov, K.I. Beloborodov, A.V. Berdyugin, D.E. Berkaev, A.G. Bogdanchikov, A.A. Botov, T.V. Dimova, V.P. Druzhinin, V.B. Golubev, L.V. Kardapoltsev, A.S. Kasaev, A.G. Kharlamov, I.A. Koop, A.A. Korol, D.P. Kovrizhin, S.V. Koshuba, A.S. Kupich, R.A. Litvinov, A.P. LysenkoAbstractA search for direct production of the f1(1285) resonance in e+e− annihilation is performed with the SND detector at the VEPP-2000 e+e− collider. The analysis is based on data with an integrated luminosity of 15.1 pb−1 accumulated...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Shell evolution of N = 40 isotones towards 60Ca: First spectroscopy of 62Ti
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): M.L. Cortés, W. Rodriguez, P. Doornenbal, A. Obertelli, J.D. Holt, S.M. Lenzi, J. Menéndez, F. Nowacki, K. Ogata, A. Poves, T.R. Rodríguez, A. Schwenk, J. Simonis, S.R. Stroberg, K. Yoshida, L. Achouri, H. Baba, F. Browne, D. Calvet, F. ChâteauAbstractExcited states in the N=40 isotone 62Ti were populated via the 63V(p,2p)62Ti reaction at ∼200 MeV/nucleon at the Radioactive Isotope Beam Factory and studied using γ-ray spectroscopy. The energies of the 21+→0gs+ and 41+→21+ transitions, observed her...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

With or without U(2)? Probing non-standard flavor and helicity structures in semileptonic B decays
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): Javier Fuentes-Martín, Gino Isidori, Julie Pagès, Kei YamamotoAbstractMotivated by the recent hints of lepton flavor universality violation observed in semileptonic B decays, we analyze how to test flavor and helicity structures of the corresponding amplitudes in view of future data. We show that the general assumption that such non-standard effects are controlled by a U(2)q×U(2)ℓ flavor symmetry, minimally broken as in the Standard Model Yukawa sector, leads to stringent predictions on leptonic and semileptonic B decays....
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Two-point string amplitudes revisited by operator formalism
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): Shigenori Seki, Tomohiko TakahashiAbstractSo far we have considered that a two-point string amplitude vanishes due to the infinite volume of residual gauge symmetry. However recently Erbin-Maldacena-Skliros have suggested that the two-point amplitude can have non-zero value, because one can cancel the infinite volume by the infinity coming from on-shell energy conservation. They derived the two-point function by Fadeev-Popov method. In this paper we revisit this two-point string amplitude in the operator formalism. We find the mostly BRST exac...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Resolving the degeneracy in top quark Yukawa coupling with Higgs pair production
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): Gang Li, Ling-Xiao Xu, Bin Yan, C.-P. YuanAbstractThe top quark Yukawa coupling (yt) can be modified by two dimension-six operators OH and Oy with the corresponding Wilson coefficients cH and cy, whose individual contribution cannot be distinguished by measuring yt alone. However, such a degeneracy can be resolved with Higgs boson pair production. In this work we explore the potential of resolving the degeneracy of the unknown Wilson coefficients cH and cy at the 14 TeV LHC and the 100 TeV hadron colliders. Combining the information of the sin...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

C12+16O molecular resonances at deep sub-barrier energy
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): Yasutaka Taniguchi, Masaaki KimuraAbstractThe existence of C12+16O molecular resonances at sub-barrier energy has been a significant problem in nuclear astrophysics because they strongly affect the C12+16O fusion reaction rate in type Ia supernovae and heavy stars. However, experimental surveys have been limited to 4 MeV and cannot access the deep sub-barrier energy due to a very small fusion cross section. Here we predict a couple of resonances with Jπ=0+, 2+, and 4+ in the deep sub-barrier energy based on the antisymmetrized molecular dyn...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

On the inexistence of self-gravitating solitons in generalised axion electrodynamics
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): Carlos A.R. Herdeiro, João M.S. OliveiraAbstractBuilding upon the methods used recently in [1], we establish the inexistence of self-gravitating solitonic solutions for both static and strictly stationary asymptotically flat spacetimes in generalised axion electrodynamics. This is an Einstein-Maxwell-axion model, where the axion field θ is non-minimally coupled to the electromagnetic field. Considering the standard QCD axion coupling, we first present an argument for the absence of static axionic solitons, i.e. localised energy ax...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Dynamic fast flavor oscillation waves in dense neutrino gases
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): Joshua D. Martin, Changhao Yi, Huaiyu DuanAbstractThe flavor transformation in a dense neutrino gas can have a significant impact on the physical and chemical evolution of its surroundings. In this work we demonstrate that a dynamic, fast flavor oscillation wave can develop spontaneously in a one-dimensional (1D) neutrino gas when the angular distributions of the electron neutrino and antineutrino cross each other. Unlike the 2D stationary models which are plagued with small-scale flavor structures, the fast flavor oscillation waves remain coh...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

5d superconformal field theories and graphs
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): Fabio Apruzzi, Craig Lawrie, Ling Lin, Sakura Schäfer-Nameki, Yi-Nan WangAbstractWe propose graphs, the Combined Fiber Diagrams (CFD), to characterize all 5d superconformal field theories (SCFTs) that arise as S1-reductions of 6d SCFTs. Transitions between CFDs encode mass deformations that trigger RG-flows between SCFTs. They provide a combinatorial classification of all such 5d SCFTs and encode physical information about the strongly coupled theories, like the superconformal flavor symmetry and BPS states. We consistently reproduce know...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Holographic Lifshitz superconductors with six derivative correction
Publication date: 10 January 2020Source: Physics Letters B, Volume 800Author(s): Jun-Wang Lu, Ya-Bo Wu, Bao-Ping Dong, Yu ZhangAbstractWe numerically realize the holographic s-wave conductor/superconductor model in the four-dimensional Lifshitz black hole with six derivative (SD) correction, and mainly study the influences of the Lifshitz parameter z as well as the SD parameter γ on the superconductor model. The results show that the increasing z inhibits the superconductor phase transition for large enough γ but enhances the phase transition for small enough γ. Meanwhile, the larger γ enhances the ...
Source: Physics Letters B - November 13, 2019 Category: Physics Source Type: research

Spiraling string in Gauss–Bonnet geometry
Publication date: Available online 11 November 2019Source: Physics Letters BAuthor(s): Mahdi Atashi, Kazem Bitaghsir FadafanAbstractIn this paper, we consider a spiraling string falling in the bulk with Gauss–Bonnet geometry that is holographically dual to a heavy particle rotating through a hot plasma at finite coupling. One finds such interesting simple problem provides a novel perspective on different channels of the energy loss in the corresponding strongly coupled theory. Depending on the sign of the coupling, one observes that the influence of finite coupling on total energy loss and contribution of drag force ...
Source: Physics Letters B - November 12, 2019 Category: Physics Source Type: research

FCNC-free multi-Higgs-doublet models from broken family symmetries
Publication date: Available online 11 November 2019Source: Physics Letters BAuthor(s): Ivo de Medeiros Varzielas, Jim TalbertAbstractWe demonstrate how residual flavour symmetries, infrared signatures of symmetry breaking in complete models of flavour, can naturally forbid (or limit in a flavour specific way) flavour-changing neutral currents (FCNC) in multi-Higgs-doublet models (MHDM) without using mass hierarchies. We first review how this model-independent mechanism can control the fermionic mixing patterns of the Standard Model, and then implement the symmetries in the Yukawa sector of MHDM, which allows us to intimate...
Source: Physics Letters B - November 12, 2019 Category: Physics Source Type: research

Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1)X model
Publication date: 10 December 2019Source: Physics Letters B, Volume 799Author(s): Arindam Das, P.S. Bhupal Dev, Nobuchika OkadaAbstractA gauged U(1)X extension of the Standard Model is a simple and consistent framework to naturally incorporate three right-handed neutrinos (RHNs) for generating the observed light neutrino masses and mixing by the type-I seesaw mechanism. We examine the collider testability of the U(1)X model, both in its minimal form with the conventional charges, as well as with an alternative charge assignment, via the resonant production of the U(1)X gauge boson (Z′) and its subsequent decay into a...
Source: Physics Letters B - November 8, 2019 Category: Physics Source Type: research

Information paradox and corrected thermodynamics for black holes
Publication date: 10 December 2019Source: Physics Letters B, Volume 799Author(s): Ming ZhangAbstractWe generally consider that entropy and temperature of a spherically symmetric black hole are corrected by quantum effect. We calculate interior entropy variation of massless scalar field and compare it with corrected Bekenstein-Hawking entropy variation for the evaporating black hole. We find that the corrected ratio between them is greater than the uncorrected one. The information paradox is then discussed. (Source: Physics Letters B)
Source: Physics Letters B - November 6, 2019 Category: Physics Source Type: research

Improving cosmological parameter estimation with the future 21 cm observation from SKA
Publication date: 10 December 2019Source: Physics Letters B, Volume 799Author(s): Jing-Fei Zhang, Li-Yang Gao, Dong-Ze He, Xin ZhangAbstractFuture observations of 21 cm emission from neutral hydrogen survey will become a promising approach to probe the large scale structure of the Universe. In this paper, we investigate the impacts of Square Kilometre Array (SKA) 21 cm observation on the estimation of cosmological parameters. We use the simulated data of the baryonic acoustic oscillation (BAO) measurements based on the future SKA experiment with the intensity mapping (IM) technique to do the analysis. For the current obser...
Source: Physics Letters B - November 6, 2019 Category: Physics Source Type: research

Prediction of hidden charm strange molecular baryon states with heavy quark spin symmetry
Publication date: 10 December 2019Source: Physics Letters B, Volume 799Author(s): C.W. Xiao, J. Nieves, E. OsetAbstractWe have studied the meson-baryon S−wave interaction in the isoscalar hidden-charm strange sector with the coupled-channels, ηcΛ, J/ψΛ, D¯Ξc, D¯sΛc, D¯Ξc′, D¯⁎Ξc, D¯s⁎Λc, D¯⁎Ξc′, D¯⁎Ξc⁎ in JP=1/2−, J/ψΛ, D¯⁎Ξc, D¯s⁎Λc, D¯⁎Ξc′, D¯Ξc⁎, D¯⁎Ξc⁎ in 3/2− and D¯⁎Ξc⁎ in 5/2−. We impose constraints of h...
Source: Physics Letters B - November 6, 2019 Category: Physics Source Type: research

A note on string excitations and the Higuchi bound
Publication date: 10 December 2019Source: Physics Letters B, Volume 799Author(s): Dieter Lüst, Eran PaltiAbstractIn this brief note we consider the interaction between high spin excitations in string theory along the Regge trajectory and the Higuchi bound in de Sitter space. There is always a point along the Regge trajectory where the Higuchi bound is violated. However, this point precisely coincides with a string whose length is of order the de Sitter Hubble scale. String theory therefore manifests no immediate inconsistency as long as the string scale Ms is above the Hubble scale H. However, an implication is that t...
Source: Physics Letters B - November 6, 2019 Category: Physics Source Type: research

X(3872) in a hot pion bath
Publication date: 10 December 2019Source: Physics Letters B, Volume 799Author(s): Martin Cleven, Volodymyr K. Magas, Angels RamosAbstractRight since its discovery in 2003 by the Belle collaboration, establishing the nature of the X(3872) meson has been one of the main priorities in the field of quarkonium physics. Not qualifying as a conventional cc¯ state, the multiquark structure of this exotic meson has received very different interpretations, ranging from a compact tetraquark configuration to an extended DD¯⁎+c.c. molecule. In this work we explore the effect that a hot pion bath may have in the properties o...
Source: Physics Letters B - November 6, 2019 Category: Physics Source Type: research

Freeze-in axion-like dark matter
We present an interesting Higgs portal model where an axion-like particle (ALP) couples to the Standard Model sector only via the Higgs field. The ALP becomes stable due to CP invariance and turns out to be a natural candidate for freeze-in dark matter because its properties are controlled by the perturbative ALP shift symmetry. The portal coupling can be generated non-perturbatively by a hidden confining gauge sector, or radiatively by new leptons charged under the ALP shift symmetry. Such UV completions generally involve a CP violating phase, which makes the ALP unstable and decay through mixing with the Higgs boson, but...
Source: Physics Letters B - November 6, 2019 Category: Physics Source Type: research

Deep learning the hyperbolic volume of a knot
In this report we use a deep neural network to approximate Vol(K) from the Jones polynomial. Our network is robust and correctly predicts the volume with 97.6% accuracy when training on 10% of the data. This points to the existence of a more direct connection between the hyperbolic volume and the Jones polynomial. (Source: Physics Letters B)
Source: Physics Letters B - November 6, 2019 Category: Physics Source Type: research

Model-independent bounds on the standard model effective theory from flavour physics
Publication date: 10 December 2019Source: Physics Letters B, Volume 799Author(s): Luca Silvestrini, Mauro ValliAbstractMeson-antimeson mixing provides the most stringent constraints on baryon- and lepton-number conserving New Physics, probing scales higher than 105 TeV. In the context of the effective theory of weak interactions, these constraints translate into severe bounds on the coefficients of ΔF=2 operators. Generalizing to the effective theory invariant under the Standard Model gauge group, valid above the electroweak scale, the bounds from ΔF=2 processes also affect ΔF=1 and even ΔF=0 operat...
Source: Physics Letters B - November 6, 2019 Category: Physics Source Type: research

Thermodynamic properties of novel dilatonic BTZ black holes under the influence of rainbow gravity
Publication date: Available online 24 October 2019Source: Physics Letters BAuthor(s): M. DehghaniAbstractThrough exact solution of the coupled scalar and gravitational field equations, in an energy dependent spacetime, two classes of novel dilatonic BTZ black holes have been found. The black hole solutions have only one horizon and their asymptotic behaviors are non-flat and non-AdS. The black hole mass, entropy and temperature have been calculated, as the conserved and thermodynamic quantities, and it has been shown that, although these quantities get modified in the presence of rainbow functions, they satisfy the first l...
Source: Physics Letters B - October 27, 2019 Category: Physics Source Type: research

Measurement of the single top quark and antiquark production cross sections in the t channel and their ratio in proton-proton collisions at s=13TeV
Publication date: Available online 24 October 2019Source: Physics Letters BAuthor(s): A.M. Sirunyan, A. Tumasyan, W. Adam, F. Ambrogi, E. Asilar, T. Bergauer, J. Brandstetter, M. Dragicevic, J. Erö, A. Escalante Del Valle, M. Flechl, R. Frühwirth, V.M. Ghete, J. Hrubec, M. Jeitler, N. Krammer, I. Krätschmer, D. Liko, T. Madlener, I. MikulecAbstractMeasurements of the cross sections for the production of single top quarks and antiquarks in the t channel, and their ratio, are presented for proton-proton collisions at a center-of-mass energy of 13 TeV. The data set used was recorded in 2016 by the CMS detector ...
Source: Physics Letters B - October 27, 2019 Category: Physics Source Type: research

Hidden relations in three generation seesaw model with Dirac mass matrix of four-zero texture
We present predictions for CP violating phases of the Type-I seesaw model with four-zero textures on the Dirac mass matrix. For the four-zero textures, the effective low energy Majorana mass matrix is parametrized with seven parameters. They are three mass-dimensional parameters, two angles and two CP violating sources. The number of these parameters is less than that of the general description of the Majorana mass matrix with three neutrino masses, three mixing angles and three CP violating phases. In particular, only two independent CP violating sources give rise to three CP violating phases. The efficient and comprehens...
Source: Physics Letters B - October 25, 2019 Category: Physics Source Type: research