First measurement of Ξ− polarization in photoproduction
Publication date: 10 August 2018Source: Physics Letters B, Volume 783Author(s): J. Bono, L. Guo, B.A. Raue, S. Adhikari, M.C. Kunkel, K.P. Adhikari, Z. Akbar, M.J. Amaryan, J. Ball, L. Barion, M. Bashkanov, M. Battaglieri, V. Batourine, I. Bedlinskiy, A.S. Biselli, W.K. Brooks, V.D. Burkert, F. Cao, D.S. Carman, A. CelentanoAbstractDespite decades of studies of the photoproduction of hyperons, both their production mechanisms and their spectra of excited states are still largely unknown. While the parity-violating weak decay of hyperons offers a means of measuring their polarization, which could help discern their producti...
Source: Physics Letters B - July 13, 2018 Category: Physics Source Type: research

Nearly isentropic flow at sizeable η/s
Publication date: 10 August 2018Source: Physics Letters B, Volume 783Author(s): Aleksi Kurkela, Urs Achim Wiedemann, Bin WuAbstractNon-linearities in the harmonic spectra of hadron–nucleus and nucleus–nucleus collisions provide evidence for the dynamical response to azimuthal spatial eccentricities. Here, we demonstrate within the framework of transport theory that even the mildest interaction correction to a picture of free-streaming particle distributions, namely the inclusion of one perturbatively weak interaction (“one-hit dynamics”), will generically give rise to all observed linear and non-lin...
Source: Physics Letters B - July 13, 2018 Category: Physics Source Type: research

The gluon and charm content of the deuteron
Publication date: 10 August 2018Source: Physics Letters B, Volume 783Author(s): Stanley J. Brodsky, Kelly Yu-Ju Chiu, Jean-Philippe Lansberg, Nodoka YamanakaAbstractWe evaluate the frame-independent gluon and charm parton-distribution functions (PDFs) of the deuteron utilizing light-front quantization and the impulse approximation. We use a nuclear wave function obtained from solving the nonrelativistic Schrödinger equation with the realistic Argonne v18 nuclear force, which we fold with the proton PDF. The predicted gluon distribution in the deuteron (per nucleon) is a few percent smaller than that of the proton in t...
Source: Physics Letters B - July 13, 2018 Category: Physics Source Type: research

A new method to study the number of colors in the final-state interactions of hadrons
Publication date: 10 August 2018Source: Physics Letters B, Volume 783Author(s): Ling-Yun Dai, Ulf-G. MeißnerAbstractBased on Chiral Perturbation Theory we introduce the dependence on the number of colors (NC) for the ππ→ππ scattering amplitudes. Those amplitudes are calculated from dispersion relations that respect analyticity and coupled channel unitarity, as well as accurately describing experiment. By varying NC the trajectories of the poles and residues (the couplings to ππ) of the light mesons, the σ/f0(500), f0(980), ρ(770) and f2(1270) are investigated. Our results show that th...
Source: Physics Letters B - July 13, 2018 Category: Physics Source Type: research

Renormalon free part of an ultrasoft correction to the static QCD potential
Publication date: Available online 12 July 2018Source: Physics Letters BAuthor(s): Hiromasa TakauraAbstractPerturbative calculations of the static QCD potential have the u=3/2 renormalon uncertainty. In the multipole expansion performed within pNRQCD, this uncertainty at LO is known to get canceled against the ultrasoft correction at NLO. To investigate the net contribution remaining after this renormalon cancellation, we propose a formulation to separate the ultrasoft correction into renormalon uncertainties and a renormalon independent part. We focus on very short distances ΛQCDr≲0.1 and investigate the ultrasof...
Source: Physics Letters B - July 13, 2018 Category: Physics Source Type: research

“Invisible” QCD axion rolling through the QCD phase transition
Publication date: Available online 12 July 2018Source: Physics Letters BAuthor(s): Jihn E. Kim, Se-Jin KimAbstractVisible matter in the current Universe is a consequence of the phase transition of the strong force, quantum chromodynamics (QCD). This phase transition has occurred at the Universe temperature around Tc≃165 MeV while it was expanding. Strongly interacting matter particles are quarks above Tc, while they are pions, protons and neutrons below Tc. The spin degrees of freedom 37 (u and d quarks and gluons) just above Tc are converted to 3 (pions) after the phase transition. This phase transition might hav...
Source: Physics Letters B - July 13, 2018 Category: Physics Source Type: research

Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)
Publication date: Available online 11 July 2018Source: Physics Letters BAuthor(s): M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. BernhardAbstractWe have searched for exclusive production of exotic charmonia in the reaction μ+N→μ+(J/ψπ+π−)π±N′ using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/ψπ+π− mass distribution we ob...
Source: Physics Letters B - July 12, 2018 Category: Physics Source Type: research

Experimental constraints on the second clock effect
Publication date: Available online 11 July 2018Source: Physics Letters BAuthor(s): I.P. Lobo, C. RomeroAbstractWe set observational constraints on the second clock effect, predicted by Weyl unified field theory, by investigating recent data on the dilated lifetime of muons accelerated by a magnetic field. These data were obtained in an experiment carried out in CERN aiming at measuring the anomalous magnetic moment of the muon. In our analysis we employ the definition of invariant proper time proposed by V. Perlick, which seems to be the appropriate notion to be worked out in the context of Weyl space-time. (Source: Physics Letters B)
Source: Physics Letters B - July 12, 2018 Category: Physics Source Type: research

Criticality associated with the variation of the Lovelock parameter
Publication date: Available online 11 July 2018Source: Physics Letters BAuthor(s): Jie-Xiong Mo, Shan-Quan LanAbstractCriticality of Lovelock AdS black holes is investigated from a completely new perspective. Instead of viewing the cosmological constant as a variable, we treat the Lovelock parameter α as a variable and study the corresponding T-r+ criticality and T-S criticality. Specifically, we consider the seven-dimensional uncharged spherical Lovelock AdS black holes as an example. We obtain the analytical expression for the critical Lovelock parameter αc, which only depends on the cosmological constant &La...
Source: Physics Letters B - July 12, 2018 Category: Physics Source Type: research

Beam energy dependence of rapidity-even dipolar flow in Au+Au collisions
Publication date: Available online 11 July 2018Source: Physics Letters BAuthor(s): J. Adam, L. Adamczyk, J.R. Adams, J.K. Adkins, G. Agakishiev, M.M. Aggarwal, Z. Ahammed, N.N. Ajitanand, I. Alekseev, D.M. Anderson, R. Aoyama, A. Aparin, D. Arkhipkin, E.C. Aschenauer, M.U. Ashraf, F. Atetalla, A. Attri, G.S. Averichev, X. Bai, V. BairathiAbstractNew measurements of directed flow for charged hadrons, characterized by the Fourier coefficient v1, are presented for transverse momenta pT, and centrality intervals in Au+Au collisions recorded by the STAR experiment for the center-of-mass energy range sNN=7.7−200 GeV. The m...
Source: Physics Letters B - July 12, 2018 Category: Physics Source Type: research

Higher-dimensional charged black holes cannot be over-charged by gedanken experiments
Publication date: Available online 11 July 2018Source: Physics Letters BAuthor(s): Boxuan Ge, Yuyu Mo, Suting Zhao, Jieping ZhengAbstractWe reconsider over-charging the higher-dimensional nearly extremal charged black holes using the new version of gedanken experiment proposed recently by Sorce and Wald. As a result, we find that cosmic censorship conjecture associated with such black holes is restored by taking into account the second-order correction, albeit violated by the first-order perturbation. Namely, the higher-dimensional nearly extremal charged black holes cannot be over-charged. (Source: Physics Letters B)
Source: Physics Letters B - July 12, 2018 Category: Physics Source Type: research

Search for a heavy Higgs boson decaying into a Z boson and another heavy Higgs boson in the ℓℓbb final state in pp collisions at s=13 TeV with the ATLAS detector
Publication date: Available online 11 July 2018Source: Physics Letters BAuthor(s): M. Aaboud, G. Aad, B. Abbott, O. Abdinov, B. Abeloos, S.H. Abidi, O.S. AbouZeid, N.L. Abraham, H. Abramowicz, H. Abreu, Y. Abulaiti, B.S. Acharya, S. Adachi, L. Adamczyk, J. Adelman, M. Adersberger, T. Adye, A.A. Affolder, Y. Afik, C. AgheorghieseiAbstractA search for a heavy neutral Higgs boson, A, decaying into a Z boson and another heavy Higgs boson, H, is performed using a data sample corresponding to an integrated luminosity of 36.1 fb−1 from proton–proton collisions at s=13 TeV recorded in 2015 and 2016 by the ATLAS detecto...
Source: Physics Letters B - July 12, 2018 Category: Physics Source Type: research

Analysis of the anomalous electromagnetic moments of the tau lepton in γp collisions at the LHC
In this study, we investigate the potential of the process pp→pγ⁎p→pτν¯τq′X at the LHC to examine the anomalous electromagnetic moments of the tau lepton. We obtain 95% confidence level bounds on the anomalous coupling parameters with various values of the integrated luminosity and center-of-mass energy. The improved bounds have been obtained on the anomalous coupling parameters of electric and magnetic moments of the tau lepton aτ and |dτ| compared to the current experimental sensitivity bounds. The γp mode of photon reactions at the LHC have shown that it has great po...
Source: Physics Letters B - July 12, 2018 Category: Physics Source Type: research

Parton distribution amplitudes: Revealing correlations within the proton and Roper
Publication date: 10 August 2018Source: Physics Letters B, Volume 783Author(s): Cédric Mezrag, Jorge Segovia, Lei Chang, Craig D. RobertsAbstractConstrained by solutions of the continuum three-valence-body bound-state equations, we use perturbation theory integral representations (PTIRs) to develop algebraic Ansätze for the Faddeev wave functions of the proton and its first radial excitation, delivering therewith a quantum field theory calculation of the pointwise behaviour of their leading-twist parton distribution amplitudes (PDAs). The proton's PDA is a broad, concave function, with its maximum shifted relat...
Source: Physics Letters B - July 12, 2018 Category: Physics Source Type: research

Conformal structure of the heavy particle EFT operator basis
Publication date: Available online 11 July 2018Source: Physics Letters BAuthor(s): Andrew Kobach, Sridip PalAbstractAn operator basis of an effective theory with a heavy particle, subject to external gauge fields, is spanned by a particular kind of neutral scalar primary of the non-relativistic conformal group. We calculate the characters that can be used for generating the operators in a non-relativistic effective field theory, which accounts for redundancies from the equations of motion and integration by parts. (Source: Physics Letters B)
Source: Physics Letters B - July 11, 2018 Category: Physics Source Type: research

First-order derivative of cluster size as a new signature of phase transition in heavy ion collisions at intermediate energies
Publication date: Available online 11 July 2018Source: Physics Letters BAuthor(s): P. Das, S. Mallik, G. ChaudhuriAbstractThe phenomenon of liquid-gas phase transition occurring in heavy ion collisions at intermediate energies is a subject of contemporary interest. Phase transition is usually characterized by the specific behaviour of state variables like pressure, density, energy etc. In heavy ion collisions there is no direct way of accessing these state variables and hence unambiguous detection of phase transition becomes difficult. This work establishes that signatures of phase transition can be extracted from the obse...
Source: Physics Letters B - July 11, 2018 Category: Physics Source Type: research

Renormalization in large-N QCD is incompatible with open/closed string duality
Publication date: Available online 11 July 2018Source: Physics Letters BAuthor(s): M. BochicchioAbstractSolving by a canonical string theory, of closed strings for the glueballs and open strings for the mesons, the 't Hooft large-N expansion of QCD is a long-standing problem that resisted all the attempts despite the advent of the celebrated gauge/gravity duality in the framework of string theory. We demonstrate that in the canonical string framework such a solution does not actually exist because an inconsistency arises between the renormalization properties of the QCD S matrix at large-N, recently worked out in Bochicchi...
Source: Physics Letters B - July 11, 2018 Category: Physics Source Type: research

Dark matter as ultralight axion-like particle in E6 × U(1)X GUT with QCD axion
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Claudio Corianò, Paul H. FramptonAbstractAxion-like fields are naturally generated by a mechanism of anomaly cancellation of one or more anomalous gauge abelian symmetries at the Planck scale, emerging as duals of a two-form from the massless bosonic sector of string theory. This suggests an analogy of the Green–Schwarz mechanism of anomaly cancellation, at field theory level, which results in one or more Stueckelberg pseudoscalars. In the case of a single Stueckelberg pseudoscalar b, vacuum misalignments at phase transitions in the ...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Asymmetric dark matter, baryon asymmetry and lepton number violation
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Mads T. Frandsen, Claudia Hagedorn, Wei-Chih Huang, Emiliano Molinaro, Heinrich PäsAbstractWe study the effect of lepton number violation (LNV) on baryon asymmetry, generated in the early Universe, in the presence of a dark sector with a global symmetry U(1)X, featuring asymmetric dark matter (ADM). We show that in general LNV, observable at the LHC or in neutrinoless double beta decay experiments, cannot wash out a baryon asymmetry generated at higher scales, unlike in scenarios without such dark sector. An observation of LNV at the TeV sca...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Virtual photon polarization and dilepton anisotropy in relativistic nucleus–nucleus collisions
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Enrico Speranza, Amaresh Jaiswal, Bengt FrimanAbstractThe polarization of virtual photons produced in relativistic nucleus–nucleus collisions provides information on the conditions in the emitting medium. In a hydrodynamic framework, the resulting angular anisotropy of the dilepton final state depends on the flow as well as on the transverse momentum and invariant mass of the photon. We illustrate these effects in dilepton production from quark–antiquark annihilation in the QGP phase and π+π− annihilation in the hadronic p...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

The exact tree-level calculation of the dark photon production in high-energy electron scattering at the CERN SPS
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): S.N. Gninenko, D.V. Kirpichnikov, M.M. Kirsanov, N.V. KrasnikovAbstractDark photon (A′) that couples to the standard model fermions via the kinetic mixing with photons and serves as a mediator of dark matter production could be observed in the high-energy electron scattering e−+Z→e−+Z+A′ off nuclei followed by the bremsstrahlung A′→invisible decay. We cross check the exact tree-level calculations of the A′ production cross sections by other results and implement them in the program for the full simula...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Prospects of discovering stable double-heavy tetraquarks at a Tera-Z factory
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Ahmed Ali, Alexander Ya. Parkhomenko, Qin Qin, Wei WangAbstractMotivated by a number of theoretical considerations, predicting the deeply bound double-heavy tetraquarks T[u¯d¯]{bb}, T[u¯s¯]{bb} and T[d¯s¯]{bb}, we explore the potential of their discovery at Tera-Z factories. Using the process Z→bb¯bb¯, we calculate, employing the Monte Carlo generators MadGraph5_aMC@NLO and Pythia6, the phase space configuration in which the bb pair is likely to fragment as a diquark. In a jet-cone, defined by an invar...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Revisiting the direct detection of dark matter in simplified models
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Tong LiAbstractIn this work we numerically re-examine the loop-induced WIMP-nucleon scattering cross section for the simplified dark matter models and the constraint set by the latest direct detection experiment. We consider a fermion, scalar or vector dark matter component from five simplified models with leptophobic spin-0 mediators coupled only to Standard Model quarks and dark matter particles. The tree-level WIMP-nucleon cross sections in these models are all momentum-suppressed. We calculate the non-suppressed spin-independent WIMP-nucleon ...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Electron flavored dark matter
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Wei Chao, Huai-Ke Guo, Hao-Lin Li, Jing ShuAbstractIn this paper we investigate the phenomenology of the electron flavored Dirac dark matter with two types of portal interactions. We analyze constraints from the electron magnetic moment anomaly, LHC searches of singly charged scalar, dark matter relic abundance as well as direct and indirect detections. Our study shows that the available parameter space is quite constrained, but there are parameter space that is compatible with the current data. We further show that the DAMPE cosmic ray electron ...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Heavy quark form factors at three loops in the planar limit
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): J. Ablinger, J. Blümlein, P. Marquard, N. Rana, C. SchneiderAbstractWe compute the color-planar and complete light quark non-singlet contributions to the heavy quark form factors in the case of the axialvector, scalar and pseudoscalar currents at three loops in perturbative QCD. We evaluate the master integrals applying a new method based on differential equations for general bases, which is applicable for all first order factorizing systems. The analytic results are expressed in terms of harmonic polylogarithms and real-valued cyclotomic ha...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Hyperheavy nuclei: Existence and stability
We present the covariant density functional study of different aspects of the existence and stability of hyperheavy nuclei. For the first time, we demonstrate the existence of three regions of spherical hyperheavy nuclei centered around (Z∼138, N∼230), (Z∼156, N∼310) and (Z∼174, N∼410) which are expected to be reasonably stable against spontaneous fission. The triaxiality of the nuclei plays an extremely important role in the reduction of the stability of hyperheavy nuclei against fission. As a result, the boundaries of nuclear landscape in hyperheavy nuclei are defined by spontaneous fission and no...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

On the tuning in the (mh,mt) plane: Standard Model criticality vs. high-scale SUSY
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Gino Isidori, Andrea PattoriAbstractWe analyse the predictions of both Higgs and top masses in a generic MSSM satisfying gauge-coupling unification, radiative electroweak symmetry breaking, with a natural (non-splitted) spectrum of soft-breaking terms, and an arbitrary soft-breaking scale (above a few TeV). This procedure allows us to identify a relatively narrow SUSY-allowed region in the (mh,mt) plane. We argue that the compatibility of the measured values of Higgs and top masses with this SUSY-allowed region is not less surprising than the cor...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Analytical infrared limit of nonlinear Thomson scattering including radiation reaction
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): A. Di PiazzaAbstractIf an electric charge is accelerated by a sufficiently intense electromagnetic field, the effects of the radiation emitted by the charge on the charge dynamics (radiation reaction) cannot be ignored. Here we show that classical radiation-reaction effects alter qualitatively and quantitatively the infrared behavior of the spectrum of the radiation emitted by an electron in the presence of an intense electromagnetic plane wave (nonlinear Thomson scattering). An analytical expression of the infrared limit of nonlinear Thomson sca...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Indirect unitarity violation entangled with matter effects in reactor antineutrino oscillations
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Yu-Feng Li, Zhi-zhong Xing, Jing-yu ZhuAbstractIf finite but tiny masses of the three active neutrinos are generated via the canonical seesaw mechanism with three heavy sterile neutrinos, the 3×3 Pontecorvo–Maki–Nakagawa–Sakata neutrino mixing matrix V will not be exactly unitary. This kind of indirect unitarity violation can be probed in a precision reactor antineutrino oscillation experiment, but it may be entangled with terrestrial matter effects as both of them are very small. We calculate the probability of ν&oline...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

On quartic colour factors in splitting functions and the gluon cusp anomalous dimension
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): S. Moch, B. Ruijl, T. Ueda, J.A.M. Vermaseren, A. VogtAbstractWe have computed the contributions of the quartic Casimir invariants to the four-loop anomalous dimensions of twist-2 spin-N operators at N≤16. The results provide new information on the structure of the next-to-next-to-next-to-leading order (N3LO) splitting functions Pik(3)(x) for the evolution of parton distributions, and facilitate approximate expressions which include the quartic-Casimir contributions to the (light-like) gluon cusp anomalous dimension. These quantities turn out ...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Status of neutrino oscillations 2018: 3σ hint for normal mass ordering and improved CP sensitivity
We present a new global fit of neutrino oscillation parameters within the simplest three-neutrino picture, including new data which appeared since our previous analysis [1]. In this update we include new long-baseline neutrino data involving the antineutrino channel in T2K, as well as new data in the neutrino channel, data from NOνA, as well as new reactor data, such as the Daya Bay 1230 days electron antineutrino disappearance spectrum data and the 1500 live days prompt spectrum from RENO, as well as new Double Chooz data. We also include atmospheric neutrino data from the IceCube DeepCore and ANTARES neutrino telescop...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Three neutrino oscillations in matter
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Ara Ioannisian, Stefan PokorskiAbstractFollowing similar approaches in the past, the Schrödinger equation for three neutrino propagation in matter of constant density is solved analytically by two successive diagonalizations of 2×2 matrices. The final result for the oscillation probabilities is obtained directly in the conventional parametric form as in the vacuum but with explicit simple modification of two mixing angles (θ12 and θ13) and mass eigenvalues. In this form, the analytical results provide excellent approximatio...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Non-thermal WIMP baryogenesis
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Ki-Young Choi, Sin Kyu Kang, Jongkuk KimAbstractWe propose a model of baryogenesis achieved by the annihilation of non-thermally produced WIMPs from decay of heavy particles, which can result in low reheating temperature. Dark matter (DM) can be produced non-thermally during a reheating period created by the decay of long-lived heavy particle, and subsequently re-annihilate to lighter particles even after the thermal freeze-out. The re-annihilation of DM provides the observed baryon asymmetry as well as the correct relic density of DM. We investi...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Strong decay of Pc(4380) pentaquark in a molecular picture
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): K. Azizi, Y. Sarac, H. SunduAbstractThere are different assumptions on the substructure of the pentaquarks Pc(4380) and Pc(4450), newly founded in J/ψN invariant mass by the LHCb Collaboration, giving consistent mass results with the experimental observations. The experimental data and recent theoretical studies on their mass suggest interpretation of these states as spin-3/2 negative-parity and spin-5/2 positive-parity pentaquarks, respectively. There may exist opposite-parity states corresponding to these particles, as well. Despite a lot o...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

ηc- and J/ψ-isoscalar meson bound states in the hadro-charmonium picture
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): J. FerrettiAbstractWe study ηc- and J/ψ-isoscalar meson bound states in the hadro-charmonium picture. In the hadro-charmonium, the four qq¯cc¯ quarks are arranged in terms of a compact charm-anticharm pair, cc¯, embedded in light hadronic matter, qq¯, with q=u, d or s. The interaction between the charmonium core and the light matter can be written in terms of the multipole expansion in QCD, with the leading term being the E1 interaction with chromo-electric field Ea. The spectrum of ηc- and J/ψ-isoscalar meson ...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Smarr integral formula of D-dimensional stationary spacetimes in Einstein-æther–Maxwell theory
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Fei-hung Ho, Shao-Jun Zhang, Haishan Liu, Anzhong WangAbstractUsing the Wald formalism, we investigate the thermodynamics of charged black holes in D-dimensional stationary spacetimes with or without rotations in Einstein-æther–Maxwell theory. In particular, assuming the existence of a scaling symmetry of the action, we obtain the Smarr integral formula, which can be applied to both Killing and universal horizons. When restricted to 4-dimensional spherically symmetric spacetimes, previous results obtained by a different method are re-...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Simultaneous extractions of |Vub| and |Vcb| with only the exclusive Λb decays
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Y.K. Hsiao, C.Q. GengAbstractWe perform the simultaneous |Vub| and |Vcb| extractions with only the exclusive Λb decays of Λb→(p,Λc+)μν¯μ, Λb→pπ− and Λb→Λc+(π−,D−). We obtain that |Vub|=(3.7±0.3)×10−3 and |Vcb|=(45.9±2.7)×10−3. Our value of |Vub| is larger than that of (3.27±0.15±0.16±0.06)×10−3, previously extracted by the LHC Collaboration from the exclusive Λb decays also, b...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Testing Dark Matter models with radio telescopes in light of gravitational wave astronomy
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Andrea Addazi, Yi-Fu Cai, Antonino MarcianòAbstractIn this article we put forward a novel phenomenological paradigm in which particle physics beyond the Standard Model may be tested by radio astronomy if these are related to a first order phase transition in the early Universe. For this type of Dark Matter models, the first order phase transition takes place at keV scales, and hence, induces the production of a stochastic gravitational waves background that can be detected from Pulsar timing measurements. We demonstrate this hypothetical f...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Electron-seeded ALP production and ALP decay in an oscillating electromagnetic field
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): B. KingAbstractCertain models involving ALPs (axion-like-particles) allow for the coupling of scalars and pseudoscalars to fermions. A derivation of the total rate for production of massive scalars and pseudoscalars by an electron in a monochromatic, circularly-polarised electromagnetic background is presented. In addition, a derivation and the total rate for the decay of massive scalars and pseudoscalars into electron–positron pairs in the same electromagnetic background is given. We conclude by approximating the total yield of ALP product...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Multiple chiral doublets in four-j shells particle rotor model: Five possible chiral doublets in 60136Nd76
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Q.B. Chen, B.F. Lv, C.M. Petrache, J. MengAbstractA particle rotor model, which couples nucleons in four single-j shells to a triaxial rotor core, is developed to investigate the five pairs of nearly degenerate doublet bands recently reported in the even-even nucleus 136Nd. The experimental energy spectra and available B(M1)/B(E2) values are successfully reproduced. The angular momentum geometries of the valence nucleons and the core support the chiral rotation interpretations not only for the previously reported chiral doublet, but also for the ...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Search for Higgs boson decays into pairs of light (pseudo)scalar particles in the γγjj final state in pp collisions at s=13TeV with the ATLAS detector
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): M. Aaboud, G. Aad, B. Abbott, O. Abdinov, B. Abeloos, S.H. Abidi, O.S. AbouZeid, N.L. Abraham, H. Abramowicz, H. Abreu, Y. Abulaiti, B.S. Acharya, S. Adachi, L. Adamczyk, J. Adelman, M. Adersberger, T. Adye, A.A. Affolder, Y. Afik, C. AgheorghieseiAbstractThis Letter presents a search for exotic decays of the Higgs boson to a pair of new (pseudo)scalar particles, H→aa, where the a particle has a mass in the range 20–60 GeV, and where one of the a bosons decays into a pair of photons and the other to a pair of gluons. The search is perf...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Screw-symmetric gravitational waves: A double copy of the vortex
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): A. IldertonAbstractPlane gravitational waves can admit a sixth ‘screw’ isometry beyond the usual five. The same is true of plane electromagnetic waves. From the point of view of integrable systems, a sixth isometry would appear to over-constrain particle dynamics in such waves; we show here, though, that no effect of the sixth isometry is independent of those from the usual five. Many properties of particle dynamics in a screw-symmetric gravitational wave are also seen in a (non-plane-wave) electromagnetic vortex; we make this connect...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Two-proton capture on the 68Se nucleus with a new self-consistent cluster model
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): D. Hove, E. Garrido, A.S. Jensen, P. Sarriguren, H.O.U. Fynbo, D.V. Fedorov, N.T. ZinnerAbstractWe investigate the two-proton capture reaction of the prominent rapid proton capture waiting point nucleus, 68Se, that produces the borromean nucleus 70Kr (Se68+p+p). We apply a recently formulated general model where the core nucleus, 68Se, is treated in the mean-field approximation and the three-body problem of the two valence protons and the core is solved exactly. We compare using two popular Skyrme interactions, SLy4 and SkM*. We calculate E2 elec...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Scalar charges and the first law of black hole thermodynamics
We present a variational formulation of Einstein–Maxwell-dilaton theory in flat spacetime, when the asymptotic value of the scalar field is not fixed. We obtain the boundary terms that make the variational principle well posed and then compute the finite gravitational action and corresponding Brown–York stress tensor. We show that the total energy has a new contribution that depends on the asymptotic value of the scalar field and discuss the role of scalar charges for the first law of thermodynamics. We also extend our analysis to hairy black holes in Anti-de Sitter spacetime and investigate the thermodynamics ...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Comment about the vanishing of the vacuum energy in the Wess–Zumino model
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Andrei O. Barvinsky, Alexander Yu. Kamenshchik, Tereza VardanyanAbstractWe check the cancellation of the vacuum energy in the Wess–Zumino model at the two-loop order in the component field formalisms with and without auxiliary fields. We show that in both cases the vacuum energy is equal to zero. However, in the formalism where the auxiliary fields are excluded, the vanishing of the vacuum energy arises due to the cancellation between the potential and kinetic energies, while in the formalism with the auxiliary fields, both terms vanish sep...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Quantum measurement in two-dimensional conformal field theories: Application to quantum energy teleportation
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Wu-Zhong Guo, Feng-Li LinAbstractWe construct a set of quasi-local measurement operators in 2D CFT, and then use them to proceed the quantum energy teleportation (QET) protocol and show it is viable. These measurement operators are constructed out of the projectors constructed from shadow operators, but further acting on the product of two spatially separated primary fields. They are equivalently the OPE blocks in the large central charge limit up to some UV-cutoff dependent normalization but the associated probabilities of outcomes are UV-cutoff...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Rastall gravity is equivalent to Einstein gravity
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Matt VisserAbstractRastall gravity, originally developed in 1972, is currently undergoing a significant surge in popularity. Rastall gravity purports to be a modified theory of gravity, with a non-conserved stress–energy tensor, and an unusual non-minimal coupling between matter and geometry, the Rastall stress–energy satisfying . Unfortunately, a deeper look shows that Rastall gravity is completely equivalent to Einstein gravity — usual general relativity. The gravity sector is completely standard, based as usual on the Einstei...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Knot polynomials for twist satellites
We describe a general decomposition of satellite's colored HOMFLY in those of the original knot, where contributing are adjoint and other representations from the “E8-sector”, what makes the story closely related to Vogel's universality. We also point out a problem with lifting the decomposition rule to the level of superpolynomials — it looks like such rule, if any, should be different for positive and negative twistings. (Source: Physics Letters B)
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

An analytic effective model for hairy black holes
Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): Yves Brihaye, Thomas Delplace, Carlos Herdeiro, Eugen RaduAbstractHairy black holes (BHs) have macroscopic degrees of freedom which are not associated with a Gauss law. As such, these degrees of freedom are not manifest as quasi-local quantities computed at the horizon. This suggests conceiving hairy BHs as an interacting system with two components: a “bald” horizon coupled to a “hairy” environment. Based on this idea we suggest an effective model for hairy BHs – typically described by numerical solutions – tha...
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research

Chromo-natural inflation in Supergravity
We present supergravity realizations of chromo-natural inflationary models. We show that by using superpotentials with “imaginary” holomorphic functions of the inflaton one can obtain effective theories of inflation that are also consistent truncations of the original supergravity models. (Source: Physics Letters B)
Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research