Wed·Mar 2, 2016Wednesday·March 2, 2016

1. 01*

   The $750$ GeV Diphoton Excesses in a Realistic D-brane Model

   Tianjun Li🇨🇳 · James A. Maxin🇺🇸 · Van E. Mayes🇺🇸 · Dimitri V. Nanopoulos🇺🇸

   We study the diphoton excesses near $750$ GeV recently reported by the ATLAS and CMS collaborations within the context of a phenomenologically interesting intersecting/magnetized D-brane model on a toroidal orientifold. It is shown that the model contains a SM singlet scalar as well as vector-like quarks and leptons. In addition, it is shown that the singlet scalar has Yukawa couplings with vector-like quarks and leptons such that it may be produced in proton-proton collisions via gluon fusion as well as decay to diphotons through loops involving the vector-like quarks. Moreover, the required vector-like quarks and leptons may appear in complete $SU(5)$ multiplets so that gauge coupling unification may be maintained. Finally, it is shown that the diphoton signal may be explained within the model.

   hep-phhep-thPRD(2016)·24 citations
2. 02*

   Favoured $B_c$ Decay modes to search for a Majorana neutrino

   Sanjoy Mandal🇮🇳 · Nita Sinha🇮🇳

   Recently, the LHCb collaboration reported the observation of the decay mode $B_c^{-}\to {\overline{B}}_s^0{\pi }^{-}$ with the largest exclusive branching fraction amongst the known decay modes of all the $B$ mesons. Here we propose a search for a few lepton-number violating decay modes of $B_c$ which can only be induced by Majorana neutrinos. Distinguishing between Dirac and Majorana nature of neutrinos is an outstanding problem and hence, all possible searches for Majorana neutrinos need to be carried out. Since the lepton number violating modes are expected to be rare, when using meson decay modes for these searches one expects CKM favoured modes to be the preferred ones; $B_c\to B_s$ is one such transition. With a resonance enhancement of the Majorana neutrino mediating the $B_c^{-}\to {\overline{B}}_s^0{\ell }_1-{\ell }_2^{-}{\pi }^{+}$ modes one can hope to observe these rare modes, or, even their non-observation can be used to obtain constraints on the mixing angles of the heavy Majorana singlet with the light flavour neutrinos from upper limits of the branching fractions which are tighter or compatible with results from earlier studies. Also, we find that the relatively suppressed mode $B_c^{-}\to J/\psi {\ell }_1^{-}{\ell }_2^{-}{\pi }^{+}$ can provide even tighter constraints on $\mid V_{eN}{\mid }^2$, $\mid V_{\mu N}{\mid }^2$, $\mid V_{eN}{V}_{\mu N}\mid$, and in a larger range of the heavy neutrino mass. Further, exclusion regions for $\mid V_{eN}{V}_{\tau N}\mid$, $\mid V_{\mu N}{V}_{\tau N}\mid$ can also be obtained for masses larger than those accessible in tau decays. Upper limits on $\mathcal{B}\left(B_c^{-}\to {\pi }^{+}{\ell }_1^{-}{\ell }_2^{-}\right)$ can also result in stringent exclusion curves for all the mixing elements, including that for $\mid V_{\tau N}{\mid }^2$ in a mass range where it is unconstrained thus far.

   hep-phhep-exPRD(2016)·33 citations
3. 03*

   Phi meson spectral moments and QCD condensates in nuclear matter

   Philipp Gubler🇮🇹 · Wolfram Weise🇩🇪

   A detailed analysis of the lowest two moments of the $\varphi$ meson spectral function in vacuum and nuclear matter is performed. The consistency is examined between the constraints derived from finite energy QCD sum rules and the spectra computed within an improved vector dominance model, incorporating the coupling of kanonic degrees of freedom with the bare $\varphi$ meson. In the vacuum, recent accurate measurements of the $e^{+}{e}^{-}\to K^{+}{K}^{-}$ cross section allow us to determine the spectral function with high precision. In nuclear matter, the modification of the spectral function can be described by the interactions of the kaons from $\varphi \to K\bar{K}$ with the surrounding nuclear medium. This leads primarily to a strong broadening and an asymmetric deformation of the $\varphi$ meson peak structure. We confirm that, both in vacuum and nuclear matter, the zeroth and first moments of the corresponding spectral functions satisfy the requirements of the finite energy sum rules to a remarkable degree of accuracy. Limits on the strangeness sigma term of the nucleon are examined in this context. Applying our results to the second moment of the spectrum, we furthermore discuss constraints on four-quark condensates and the validity of the commonly used ground state saturation approximation.

   hep-phhep-exnucl-exnucl-thNPA(2016)·38 citations
4. 04*

   Large, Extra Dimensions at the Deep Underground Neutrino Experiment

   Jeffrey M. Berryman🇺🇸 · André de Gouvêa🇺🇸 · Kevin J. Kelly🇺🇸 · O.L.G. Peres🇧🇷 · Zahra Tabrizi🇧🇷

   We investigate the potential of the long-baseline Deep Underground Neutrino Experiment (DUNE) to study large-extra-dimension (LED) models originally proposed to explain the smallness of neutrino masses by postulating that right-handed neutrinos, unlike all standard model fermion fields, can propagate in the bulk. The massive Kaluza-Klein (KK) modes of the right-handed neutrino fields modify the neutrino oscillation probabilities and can hence affect their propagation. We show that, as far as DUNE is concerned, the LED model is indistinguishable from a $(3+3N)$-neutrino framework for modest values of $N$; $N$ = 1 is usually a very good approximation. Nonetheless, there are no new sources of $CP$-invariance violation other than one $CP$-odd phase that can be easily mapped onto the $CP$-odd phase in the standard three-neutrino paradigm. We analyze the sensitivity of DUNE to the LED framework, and explore the capability of DUNE to differentiate the LED model from the three-neutrino scenario and from a generic $(3+1)$-neutrino model.

   hep-phPRD(2016)·34 citations
5. 05*

   Non-thermal WIMPs and Primordial Black Holes

   Julian Georg🇺🇸 · Gizem Şengör🇺🇸 · Scott Watson🇺🇸

   Non-thermal histories for the early universe have received notable attention as they are a rich source of phenomenology, while also being well motivated by top-down approaches to beyond the Standard Model physics. The early (pre-BBN) matter phase in these models leads to enhanced growth of density perturbations on sub-Hubble scales. Here we consider whether primordial black hole formation associated with the enhanced growth is in conflict with existing observations. Such constraints depend on the tilt of the primordial power spectrum, and we find that non-thermal histories are tightly constrained in the case of a significantly blue spectrum. Alternatively, if dark matter is taken to be of non-thermal origin we can restrict the primordial power spectrum on scales inaccessible to CMB and LSS observations. We establish constraints for a wide range of scalar masses (reheat temperatures) with the most stringent bounds resulting from the formation of $10^{15}$ g black holes. These black holes would be evaporating today and are constrained by FERMI observations. We also consider whether the breakdown of the coherence of the scalar oscillations on sub-horizon scales can lead to a Jean's pressure preventing black hole formation and relaxing our constraints. Our main conclusion is that primordial black hole constraints, combined with existing constraints on non-thermal WIMPs, favor a primordial spectrum closer to scale invariance or a red tilted spectrum.

   hep-phastro-ph.COhep-thPRD(2016)·43 citations
6. 06*

   Faking SM Photons by Displaced Dark Photon Decays

   Yuhsin Tsai🇺🇸 · Lian-Tao Wang🇺🇸 · Yue Zhao🇺🇸

   A light meta-stable dark photon decaying into collimated electron/positron pair can fake a photon, either converted or unconverted, at the LHC. The detailed object identification relies on the specifics of the detector and strategies for the reconstruction. We study the fake rate based on the ATLAS(CMS) detector geometry and show that it can be O(1) with a generic choice of parameters. Especially, the probability of being registered as a photon is angular dependent. Such detector effects can induce bias to measurements on certain properties of new physics. In this paper, we consider the scenario where dark photons in final states are from a heavy resonance decay. Consequently, the detector effects can dramatically affect the results when determine the spin of a resonance. Further, if the decay products from the heavy resonance are one photon and one dark photon, which has a large probability to fake a diphoton event, the resonance is allowed to be a vector. Due to the difference in detector, the cross sections measured in ATLAS and CMS do not necessarily match. Furthermore, if the diphoton signal is given by the dark photons, the SM $Z\gamma$ and $ZZ$ final states do not necessarily come with the $\gamma \gamma$ channel, which is a unique signature in our scenario. The issue studied here is relevant also for any future new physics searches with photon(s) in the final state. We discuss possible ways of distinguishing dark photon decay and real photon in the future.

   hep-phhep-exPRD(2017)·26 citations
7. 07*

   Thinking outside the ROCs: Designing Decorrelated Taggers (DDT) for jet substructure

   James Dolen🇺🇸 · Philip Harris🇨🇭 · Simone Marzani🇺🇸 · Salvatore Rappoccio🇺🇸 · Nhan Tran🇺🇸

   We explore the scale-dependence and correlations of jet substructure observables to improve upon existing techniques in the identification of highly Lorentz-boosted objects. Modified observables are designed to remove correlations from existing theoretically well-understood observables, providing practical advantages for experimental measurements and searches for new phenomena. We study such observables in $W$ jet tagging and provide recommendations for observables based on considerations beyond signal and background efficiencies.

   hep-phhep-exJHEP(2016)·172 citations
8. 08*

   Little Conformal Symmetry

   Rachel Houtz🇺🇸 · Kitran Colwell🇺🇸 · John Terning🇺🇸

   We explore a new class of natural models which ensure the one-loop divergences in the Higgs mass are cancelled. The top-partners that cancel the top loop are new gauge bosons, and the symmetry relation that ensures the cancellation arises at an infrared fixed point. Such a cancellation mechanism can, a la Little Higgs models, push the scale of new physics that completely solves the hierarchy problem up to 5-10 TeV. When embedded in a supersymmetric model, the stop and gaugino masses provide the cutoffs for the loops, and the mechanism ensures a cancellation between the stop and gaugino mass dependence of the Higgs mass parameter.

   hep-phJHEP(2016)·8 citations
9. 09*

   Gravitational Effects on Measurements of the Muon Dipole Moments

   Andrew Kobach🇺🇸

   If the technology for muon storage rings one day permits sensitivity to precession at the order of $10^{-8}$ Hz, the local gravitational field of Earth can be a dominant contribution to the precession of the muon, which, if ignored, can fake the signal for a nonzero muon electric dipole moment (EDM). Specifically, the effects of Earth's gravity on the motion of a muon's spin is indistinguishable from it having a nonzero EDM of magnitude $d_{\mu }\sim 10^{-29}$ e cm in a storage ring with vertical magnetic field of $\sim$ 1 T, which is significantly larger than the expected upper limit in the Standard Model, $d_{\mu }\lesssim 10^{-36}$ e cm. As a corollary, measurements of Earth's local gravitational field using stored muons would be a unique test to distinguish classical gravity from general relativity with a bonafide quantum mechanical entity, i.e., an elementary particle's spin.

   hep-phhep-exNPB(2016)·9 citations
10. 10*

    $J/\psi$ $\to$ $DP$, $DV$ decays in the QCD factorization approach

    Junfeng Sun🇨🇳 · Lili Chen🇨🇳 · Qin Chang🇨🇳 · Jinshu Huang🇨🇳 · Yueling Yang🇨🇳

    Motivated by the recent measurements on nonleptonic $J/\psi$ weak decays at BESIII and the potential prospects of $J/\psi$ meson at the high-luminosity heavy-flavor experiments, the branching ratios of the two-body nonleptonic $J/\psi$ $\to$ $DP$, $DV$ decays are estimated quantitatively by considering the QCD radiative corrections to hadronic matrix elements with the QCD factorization approach. It is found that the Cabibbo favored $J/\psi$ $\to$ $D_s^{-}{\rho }^{+}$, $D_s^{-}{\pi }^{+}$, ${\overline{D}}_u^0{\overline{K}}^{\ast 0}$ decays have branching ratios $\gtrsim$ $10^{-10}$, which might be promisingly detectable in the near future.

    hep-phInt.J.Mod.Phys.A(2015)·10 citations
11. 11*

    Quantum gravity corrections to the standard model Higgs in Einstein and $R^2$ gravity

    Yugo Abe🇯🇵 · Masaatsu Horikoshi🇯🇵 · Takeo Inami🇯🇵

    We evaluate quantum gravity corrections to the standard model Higgs potential $V(\varphi )$ a la Coleman-Weinberg and examine the stability question of $V(\varphi )$ at scales of Planck mass $M_{\mathrm{Pl}}$. We compute the gravity one-loop corrections by using the momentum cut-off in Einstein gravity. The gravity corrections affect the potential in a significant manner for the value of $\Lambda =(1-3)M_{\mathrm{Pl}}.$ In view of reducing the UV cut-off dependence we also make a similar study in the $R^2$ gravity.

    hep-ph3 citations
12. 12*

    Possible $B^{(\ast )}\bar{K}$ hadronic molecule state

    Cheng-Jian Xiao🇨🇳 · Dian-Yong Chen🇨🇳

    In the present work, we estimate the decays of the $X(5568)$ and $X(5616)$ in a $B\bar{K}$ and a $B^{\ast }\bar{K}$ $S$-wave hadronic molecule scenarios, respectively, which may corresponding to the structure observed by D0 Collaboration. Our estimation indicates both $B\bar{K}$ and $B^{\ast }\bar{K}$ hadronic molecule decay widths could explain the experimental data in a proper model parameter range.

    hep-phEPJA(2017)·48 citations
13. 13*

    Neutrino masses and ordering via multimessenger astronomy

    Kasper Langaeble🇩🇰 · Aurora Meroni🇩🇰 · Francesco Sannino🇩🇰

    We define the theoretical framework and deduce the conditions under which multi-messenger astronomy can provide useful information about neutrino masses and their ordering. The framework uses time differences between the arrival of neutrinos and the other light messenger, i.e. the graviton, emitted in astrophysical catastrophes. We also provide a preliminary feasibility study elucidating the experimental reach and challenges for planned neutrino detectors such as Hyper-Kamiokande as well as future several megaton detectors. This study shows that future experiments can be useful in testing independently the cosmological bounds on absolute neutrino masses. Concretely the success of such measurements depends crucially on the available rate of astrophysical events and further requires development of high resolution timing besides the advocated need of megaton size detectors.

    hep-phastro-ph.HEgr-qchep-exPRD(2016)·8 citations
14. 14*

    Revisiting the R$\nu$MDM Models

    Yi Cai🇦🇺 · Michael A. Schmidt🇦🇺

    Combining neutrino mass generation and a dark matter candidate in a unified model has always been intriguing. We revisit the class of R$\nu$MDM models, which incorporate minimal dark matter in radiative neutrino mass models based on the one-loop ultraviolet completions of the Weinberg operator. The possibility of an exact accidental $Z_2$ is completely ruled out in this scenario. We study the phenomenology of one of the models with an approximate $Z_2$ symmetry. In addition to the Standard Model particles, it contains two real scalar quintuplets, one vector- like quadruplet fermion and a fermionic quintuplet. The neutral component of the fermionic quintuplet serves as a good dark matter candidate which can be tested by the future direct and indirect detection experiments. The constraints from flavor physics and electroweak-scale naturalness are also discussed.

    hep-phJHEP(2016)·19 citations
15. 15*

    A $\gamma \gamma$ Collider for the 750 GeV Resonant State

    Min He🇨🇳 · Xiao-Gang He🇨🇳 · Yong Tang🇰🇷

    Recent data collected by ATLAS and CMS at 13 TeV collision energy of the LHC indicate the existence of a new resonant state $\varphi$ with a mass of 750 GeV decaying into two photons $\gamma \gamma$. The properties of $\varphi$ should be studied further at the LHC and also future colliders. Since only $\varphi \to \gamma \gamma$ decay channel has been measured, one of the best ways to extract more information about $\varphi$ is to use a $\gamma \gamma$ collider to produce $\varphi$ at the resonant energy. In this work we show how a $\gamma \gamma$ collider helps to verify the existence of $\varphi$ and to provide some of the most important information about the properties of $\varphi$, such as branching fractions of $\varphi \to V_1{V}_2$. Here $V_i$ can be $\gamma$, $Z$, or $W^{\pm }$. We also show that by studying angular distributions of the final $\gamma$'s in $\gamma \gamma \to \varphi \to \gamma \gamma$, one can obtain crucial information about whether this state is a spin-0 or a spin-2 state.

    hep-phhep-exPLB(2016)·17 citations
16. 16*

    Width of the exotic $X_b(5568)$ state through its strong decay to $B_s^0{\pi }^{+}$

    S. S. Agaev🇦🇿 · K. Azizi🇹🇷 · H. Sundu🇹🇷

    The width of the newly observed exotic state $X_b(5568)$ is calculated via its dominant strong decay to using the QCD sum rule method on the light-cone in conjunction with the soft-meson approximation. To this end, the vertex $X_b{B}_s\pi$ is studied and the strong coupling $g_{X_b{B}_s\pi }$ is computed employing for $X_b(5568)$ state the interpolating diquark-antidiquark current of the $[su][\overline{b}\overline{d}]$ type. The obtained prediction for the decay width of $X_b(5568)$ is confronted and a nice agreement found with the experimental data of the D0 Collaboration.

    hep-phhep-exhep-latPRD(2016)·62 citations
17. 17*

    Photon merging and splitting in electromagnetic field inhomogeneities

    Holger Gies🇩🇪 · Felix Karbstein🇩🇪 · Nico Seegert🇩🇪

    We investigate photon merging and splitting processes in inhomogeneous, slowly varying electromagnetic fields. Our study is based on the three-photon polarization tensor following from the Heisenberg-Euler effective action. We put special emphasis on deviations from the well-known constant field results, also revisiting the selection rules for these processes. In the context of high-intensity laser facilities, we analytically determine compact expressions for the number of merged/split photons as obtained in the focal spots of intense laser beams. For the parameter range of a typical petawatt class laser system as pump and a terawatt class laser as probe, we provide estimates for the numbers of signal photons attainable in an actual experiment. The combination of frequency upshifting, polarization dependence and scattering off the inhomogeneities renders photon merging an ideal signature for the experimental exploration of nonlinear quantum vacuum properties.

    hep-phhep-thquant-phPRD(2016)·30 citations
18. 18*

    Status and perspectives of neutrino magnetic moments

    Alexander Studenikin🇷🇺

    Basic theoretical and experimental aspects of neutrino magnetic moments are reviewed, including the present best upper bounds from reactor experiments and astrophysics. An interesting effect of neutrino spin precession and oscillations induced by the background matter transversal current or polarization is also discussed.

    hep-phastro-ph.HEJ.Phys.Conf.Ser.(2016)·30 citations
19. 19*

    Constraints on Scalar Leptoquark from Kaon Sector

    Girish Kumar🇮🇳

    Recently, several anomalies in flavor physics have been observed, and it was noticed that leptoquarks might account for the deviations from the Standard Model. In this work, we examine the effects of new physics originating from a scalar leptoquark model on the kaon sector. The leptoquark we consider is a TeV-scale particle and within the reach of the LHC. We use the existing experimental data on the several kaon processes including $K^0-{\bar{K}}^0$ mixing, rare decays $K^{+}\to {\pi }^{+}\nu \bar{\nu }$, $K_L\to {\pi }^0\nu \bar{\nu }$, short-distance part of $K_L\to {\mu }^{+}{\mu }^{-}$, and lepton-flavor-violating decay $K_L\to {\mu }^{\pm }{e}^{\mp }$ to obtain useful constraints on the model.

    hep-phPRD(2016)·18 citations
20. 20*

    Perturbativity and mass scales of Left-Right Higgs bosons

    Alessio Maiezza🇪🇸 · Miha Nemevšek🇸🇮 · Fabrizio Nesti🇭🇷

    The scalar sector of the minimal Left-Right model at TeV scale is revisited in light of the large quartic coupling needed for a heavy flavor-changing scalar. The stability and perturbativity of the effective potential is discussed and merged with constraints from low-energy processes. Thus the perturbative level of the Left-Right scale is sharpened. Lower limits on the triplet scalars are also derived: the left-handed triplet is bounded by oblique parameters, while the doubly-charged right-handed component is limited by the $h\to \gamma \gamma ,Z\gamma$ decays. Current constraints disfavor their detection as long as $W_R$ is within the reach of the LHC.

    hep-phhep-exPRD(2016)·61 citations
21. 21*

    On the two-loop virtual QCD corrections to Higgs boson pair production in the Standard Model

    Giuseppe Degrassi🇮🇹 · Pier Paolo Giardino🇺🇸 · Ramona Gröber🇮🇹

    We compute the next-to-leading order virtual QCD corrections to Higgs pair production via gluon fusion. We present analytic results for the two-loop contributions to the spin-0 and spin-2 form factors in the amplitude. The reducible contributions, given by the double-triangle diagrams, are evaluated exactly while the two-loop irreducible diagrams are evaluated by an asymptotic expansion in heavy top quark mass up to and including terms of $\mathcal{O}(1/m_t^8)$. Assuming that the finite top-quark mass effects are of similar size in the entire range of partonic energies we estimate that mass effects can reduce the hadronic cross section by at most $10\%$.

    hep-phEPJC(2016)·93 citations
22. 22*

    Photon Mass Limits from Fast Radio Bursts

    Luca Bonetti🇫🇷 · John Ellis🇬🇧 · Nikolaos E. Mavromatos🇬🇧 · Alexander S. Sakharov🇨🇭 · Edward K.G. Sarkisyan-Grinbaum🇨🇭 · Alessandro D.A.M. Spallicci🇫🇷

    The frequency-dependent time delays in fast radio bursts (FRBs) can be used to constrain the photon mass, if the FRB redshifts are known, but the similarity between the frequency dependences of dispersion due to plasma effects and a photon mass complicates the derivation of a limit on $m_{\gamma }$. The dispersion measure (DM) of FRB 150418 is known to $\sim 0.1$%, and there is a claim to have measured its redshift with an accuracy of $\sim 2$%, but the strength of the constraint on $m_{\gamma }$ is limited by uncertainties in the modelling of the host galaxy and the Milky Way, as well as possible inhomogeneities in the intergalactic medium (IGM). Allowing for these uncertainties, the recent data on FRB 150418 indicate that $m_{\gamma }\lesssim 1.8\times 10^{-14}$eV c${}^{-2}$ ($3.2\times 10^{-50}$kg), if FRB 150418 indeed has a redshift $z=0.492$ as initially reported. In the future, the different redshift dependences of the plasma and photon mass contributions to DM can be used to improve the sensitivity to $m_{\gamma }$ if more FRB redshifts are measured. For a fixed fractional uncertainty in the extra-galactic contribution to the DM of an FRB, one with a lower redshift would provide greater sensitivity to $m_{\gamma }$.

    ↳ astro-ph.HEastro-ph.COhep-phPLB(2016)·91 citations
23. 23*

    Interacting Scalar Radiation and Dark Matter in Cosmology

    Yong Tang🇰🇷

    We investigate possible cosmological effects of interacting scalar radiation and dark matter. After its decoupling, scalar radiation can stream freely as neutrinos or self-interact strongly as perfect fluid, highly depending on the magnitude of its self-couplings. We obtain the general and novel structure for self-scattering rate and compare it with the expansion rate of our Universe. If its trilinear/cubic coupling is non-zero, scalar radiation can be eventually treated as perfect fluid. Possible effects on CMB are also discussed. When this scalar also mediates interaction among dark matter particles, the linear matter power spectrum for large scale structure can be modified differently from other models. We propose to use Debye shielding to avoid the singularity appearing in the scattering between scalar radiation and dark matter.

    ↳ astro-ph.COhep-phPLB(2016)·18 citations
24. 24*

    Production and Interactions of Hyperons and Hypernuclei

    Horst Lenske🇩🇪 · Xu Cao🇨🇳 · Madhumita Dhar🇩🇪 · Theodoros Gaitanos🇬🇷 · Radhey Shyam🇮🇳

    The production of strangeness on the nucleon and hyperon and hypernuclear production in heavy ion collisions at relativistic energies and in antiproton annihilation on nuclei is discussed. The reaction process is described by transport theory with focus on $S=-2$ channels and a comparison of different model interactions. The interactions of hyperons in nuclear matter is investigated in a novel SU(3) approach. An outlook to the $S=-3$ sector and ${\Omega }^{-}$ physics is given.

    ↳ nucl-thhep-phnucl-exJPS Conf.Proc.(2017)·2 citations
25. 25*

    Competition and duality correspondence between chiral and superconducting channels in (2+1)-dimensional four-fermion models with fermion number and chiral chemical potentials

    D. Ebert🇩🇪 · T.G. Khunjua🇷🇺 · K.G. Klimenko🇷🇺 · V.C. Zhukovsky🇷🇺

    In this paper the duality correspondence between fermion-antifermion and difermion interaction channels is established in two (2+1)-dimensional Gross-Neveu type models with a fermion number chemical potential $\mu$ and a chiral chemical potential ${\mu }_5$. The role and influence of this property on the phase structure of the models are investigated. In particular, it is shown that the chemical potential ${\mu }_5$ promotes the appearance of dynamical chiral symmetry breaking, whereas the chemical potential $\mu$ contributes to the emergence of superconductivity.

    ↳ hep-thhep-phPRD(2016)·31 citations
26. 26*

    The 3He spectral function in light-front dynamics

    Matteo Rinaldi🇮🇹 · Alessio Del Dotto🇮🇹 · Leonid Kaptari🇷🇺 · Emanuele Pace🇮🇹 · Giovanni Salmè🇮🇹 · Sergio Scopetta🇮🇹

    A distorted spin-dependent spectral function for 3He is considered for the extraction of the transverse-momentum dependent parton distributions in the neutron from semi-inclusive deep inelastic electron scattering off polarized 3He at finite momentum transfers, where final state interactions are taken into account. The generalization of the analysis to a Poincaré covariant framework within the light-front dynamics is outlined.

    ↳ nucl-thhep-phEPJ Web Conf.(2016)·1 citation
27. 27*

    The Exact SL(K+3,C) Symmetry of String Scattering Amplitudes

    Sheng-Hong Lai🇹🇼 · Jen-Chi Lee🇹🇼 · Yi Yang🇹🇼

    We discover that the 26D open bosonic string scattering amplitudes (SSA) of three tachyons and one arbitrary string state can be expressed in terms of the D-type Lauricella functions with associated SL(K+3,C) symmetry. As a result, SSA and symmetries or relations among SSA of different string states at various limits calculated previously can be rederived. These include the linear relations conjectured by Gross [1-3] and proved in [4-9] in the hard scattering limit, the recurrence relations in the Regge scattering limit [14-16] and the extended recurrence relations in the nonrelativistic scattering limit [19] discovered recently. Finally, as an application, we calculate a new recurrence relation of SSA which is valid for all energies.

    ↳ hep-thhep-ph8 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.