Mon·Jan 2, 2017Monday·January 2, 2017

1. 01*

   Antisplit Supersymmetry

   Linda M. Carpenter🇺🇸

   I explore the phenomenology of Supersymmetry models in which the gauginos are much heavier then that scalar particles of the MSSM. In these models, the gauginos are inaccessible to colliders while the scalar spectrum is compressed. I give several examples of models which exhibit this phenomenology built in the class of General Gauge Mediated Models. I explore possible LSP and NLSP candidates in these scenarios including Higgsino, stau, and sneutrino candidates. Collider signatures for these models include multi-particle decay chains, many taus in the final state, and possible displaced vertices with semi-long lived sparticles. I enumerate the most likely collider smoking gun collider signatures for each general LSP/NLSP scenario.

   hep-phJHEP(2017)·10 citations
2. 02*

   Gravitational Searches for Lorentz Violation with Matter and Astrophysics

   Jay D. Tasson🇺🇸

   This contribution to the CPT'16 proceedings summarizes recent tests of Lorentz violation in the pure-gravity sector with cosmic rays and reviews recent progress in matter-gravity couplings.

   hep-ph0 citations
3. 03*

   Neutrino oscillations and Lorentz invariance violation

   S. A. Alavi🇮🇷 · M. Dehghani Madise🇮🇷

   Lorentz invariance is a well known fundamental concept of special relativity but its violation is predicted by some variations of quantum gravity, string theory, and some alternatives to general relativity. We study neutrino oscillation at the presence of the Lorentz invariance violation in vacuum, normal and nuclear media. It is shown that for very high energy neutrinos the neutrino oscillations due to mass difference is suppressed and its contribution to the conversion probability is negligibly small, but the contribution of the Lorentz invariance violation term is not zero. This means that the observation of very high energy neutrino oscillations may be a signal of the discreteness of space and Lorentz invariance violation.

   hep-ph0 citations
4. 04*

   Exotic decays of the 125 GeV Higgs boson at future $e^{+}{e}^{-}$ lepton colliders

   Zhen Liu🇺🇸 · Lian-Tao Wang🇺🇸 · Hao Zhang🇨🇳

   Discovery of unexpected properties of the Higgs boson offers an intriguing opportunity of shedding light on some of the most profound puzzles in particle physics. The Beyond Standard Model (BSM) decays of the Higgs boson could reveal new physics in a direct manner. Future electron-positron lepton colliders operating as Higgs factories, including CEPC, FCC-ee and ILC, with the advantages of a clean collider environment and large statistics, could greatly enhance the sensitivity in searching for these BSM decays. In this work, we perform a general study of Higgs exotic decays at future $e^{+}{e}^{-}$ lepton colliders, focusing on the Higgs decays with hadronic final states and/or missing energy, which are very challenging for the High-Luminosity program of the Large Hadron Collider (HL-LHC). We show that with simple selection cuts, $O(10^{-3}\sim 10^{-5})$ limits on the Higgs exotic decay branching fractions can be achieved using the leptonic decaying spectator $Z$ boson in the associated production mode $e^{+}{e}^{-}\to ZH$. We further discuss the interplay between the detector performance and Higgs exotic decay, and other possibilities of exotic decays. Our work is a first step in a comprehensive study of Higgs exotic decays at future lepton colliders, which is a key ingredient of Higgs physics that deserves further investigation.

   hep-phCPC(2017)·102 citations
5. 05*

   Effective lepton flavor violating $\mathbf{H}{\mathbf{\ell }}_{\mathbf{i}}{\mathbf{\ell }}_{\mathbf{j}}$ vertex from right-handed neutrinos within the mass insertion approximation

   E. Arganda🇦🇷 · M.J. Herrero🇪🇸 · X. Marcano🇪🇸 · R. Morales🇦🇷 · A. Szynkman🇦🇷

   In this work we present a new computation of the lepton flavor violating Higgs boson decays that are generated radiatively to one-loop from heavy right-handed neutrinos. We work within the context of the inverse seesaw model with three ${\nu }_R$ and three extra singlets $X$, but the results could be generalized to other low scale seesaw models. The novelty of our computation is that it uses a completely different method by means of the mass insertion approximation which works with the electroweak interaction states instead of the usual 9 physical neutrino mass eigenstates of the inverse seesaw model. This method also allows us to write the analytical results explicitly in terms of the most relevant model parameters, that are the neutrino Yukawa coupling matrix $Y_{\nu }$ and the right-handed mass matrix $M_R$, which is very convenient for a phenomenological analysis. This $Y_{\nu }$ matrix, being generically nondiagonal in flavor space, is the only responsible for the induced charged lepton flavor violating processes of our interest. We perform the calculation of the decay amplitude up to order $\mathcal{O}(Y_{\nu }^2+Y_{\nu }^4)$. We also study numerically the goodness of the mass insertion approximation results. In the last part we present the computation of the relevant one-loop effective vertex $H{\ell }_i{\ell }_j$ for the lepton flavor violating Higgs decay which is derived from a large $M_R$ mass expansion of the form factors. We believe that our simple formula found for this effective vertex can be of interest for other researchers who wish to estimate the $H\to {\ell }_i{\bar{\ell }}_j$ rates in a fast way in terms of their own preferred input values for the relevant model parameters $Y_{\nu }$ and $M_R$.

   hep-phPRD(2017)·47 citations
6. 06*

   Twin Higgs With T parity

   Jiang-Hao Yu🇺🇸

   In twin Higgs models, a discrete Z2 symmetry between the standard model Higgs and the twin Higgs is introduced to address the hierarchy problem. In this work, we propose another discrete symmetry in twin Higgs: the T parity, which maps the twin Higgs quadruplet into its mirror copy. The T parity brings us a whole group of T-odd particles, and leads to a promising dark matter candidate. We present one realization of the T parity twin Higgs scenario by implementing the $SU(2{)}_L\times SU(2{)}_R\times U(1{)}_1\times U(1{)}_2$ gauge symmetry in twin Higgs model. In this specific setup, the T-odd U(1) gauge boson could be the dark matter candidate, and the T-odd particles have very distinct and interesting phenomenology.

   hep-phPRD(2017)·7 citations
7. 07*

   Triple Higgs coupling effect on $h^0\to b\bar{b}$ and $h^0\to {\tau }^{+}{\tau }^{-}$ in the 2HDM

   A. Arhrib🇲🇦 · R. Benbrik🇲🇦 · J. El Falaki🇲🇦 · W. Hollik🇩🇪

   We study the one loop electroweak radiative corrections to $h^0\to b\bar{b}$ and $h^0\to {\tau }^{+}{\tau }^{-}$ in the framework of two Higgs doublet Model (2HDM). We evaluate the deviation of these couplings from their Standard Model (SM) values. $h^0\to b\bar{b}$ and $h^0\to {\tau }^{+}{\tau }^{-}$ may receives large contribution from triple couplings $h^0{H}^0{H}^0$, $H^0{h}^0{h}^0$, $h^0{A}^0{A}^0$ and $h^0{H}^{+}{H}^{-}$ which are absent in the Standard Model. It is found that in 2HDM, these corrections could be significant and may reach more than 20\% for not tow heavy $H^0$ or $A^0$ or $H^{\pm }$. We also study the ratio of branching ratios $R=BR(h^0\to b\bar{b})/BR(h^0\to {\tau }^{+}{\tau }^{-})$ of Higgs boson decays which could be used to disentangle SM from other models such as 2HDM.

   hep-phPLB(2017)·10 citations
8. 08*

   Analysis of radial excitations of octet baryons in QCD sum rules

   T.M. Aliev🇹🇷 · S. Bilmis🇹🇷

   Using the QCD sum rules method, we estimate the mass and residues of the first radial excitations of octet baryons. The contributions coming from the ground state baryons are eliminated by constructing the linear combinations of the sum rules corresponding to different Lorentz structures. Our predictions of the masses of the first radial excitations of octet baryons are in good agreement with the data.

   hep-phAdv.High Energy Phys.(2017)·5 citations
9. 09*

   Improved limits on the hadronic and semi-hadronic CP violating parameters and role of a dark force carrier in the electric dipole moment of ${}^{199}$Hg

   B. K. Sahoo🇮🇳

   Combining the recently reported electric dipole moment (EDM) of ${}^{199}$Hg atom due to breaking of parity and time-reversal symmetries with the improved relativistic atomic calculations, precise limits on the tensor-pseudotensor (T-PT) electron-nucleus (e-N) coupling coefficient and the nuclear Schiff moment (NSM) interactions are determined. Using these limits with the nuclear calculations, we infer limits on the EDMs of neutron and proton as $d_n<2.2\times 10^{-26}|e|\mathrm{cm}$ and $d_p<2.1\times 10^{-25}|e|\mathrm{cm}$, respectively, and on the quantum chromodynamics (QCD) parameter and the combined up- and down- quark chromo-EDMs as $|\bar{\theta }|<1.1\times 10^{-10}$ and $|{\tilde{d}}_u-{\tilde{d}}_d|<5.5\times 10^{-27}|e|\mathrm{cm}$, respectively. These are the best limits till date to probe new sources of CP violation beyond the standard model (SM) from a diamagnetic atom. Role of considering a capable many-body method to account the electron correlation effects to all orders for inferring the above limits has been highlighted. From this analysis, constraints on the T-PT e-N coupling coefficient with a large range of mass of a possible dark matter carrier $\chi$ between the atomic electrons and nucleus are given.

   hep-phnucl-thphysics.atom-phPRD(2017)·48 citations
10. 10*

    Low-energy Effective Worldsheet theory of a non-Abelian vortex in high-density QCD Revisited: A regular gauge construction

    Chandrasekhar Chatterjee🇯🇵 · Muneto Nitta🇯🇵

    Color symmetry is spontaneously broken in quark matter at high density as a consequence of di-quark condensations with exhibiting color superconductivity. Non-Abelian vortices or color magnetic flux tubes stably exist in the color-flavor locked phase at asymptotically high-density. The effective worldsheet theory of a single non-Abelian vortex was previously calculated in the singular gauge to obtain the $\mathbb{C}{P}^2$ model [ arXiv:0908.4470 , arXiv:0912.1352 ]. Here, we reconstruct the effective theory in a regular gauge without taking a singular gauge, confirming the previous results in the singular gauge. As a byproduct of our analysis, we find that non-Abelian vortices in high-density QCD do not suffer from any obstruction for the global definition of a symmetry breaking.

    hep-phhep-thPRD(2017)·7 citations
11. 11*

    Born Level Bound States

    Paul Hoyer🇫🇮

    Bound state poles in the $S$-matrix of perturbative QED are generated by the {\em divergence} of the expansion in $\alpha$. The perturbative corrections are necessarily singular when expanding around free, \order{\alpha^0} $in$ and $out$ states that have no overlap with finite-sized atomic wave functions. Nevertheless, measurables such as binding energies do have well-behaved expansions in powers of $\alpha$ (and $\log \alpha$). It is desirable to formulate the concept of "lowest order" for gauge theory bound states such that higher order corrections vanish in the $\alpha \to 0$ limit. This may allow to determine a lowest order term for QCD hadrons which incorporates essential features such as confinement and chiral symmetry breaking, and thus can serve as the starting point of a useful perturbative expansion. I discuss a "Born" (no loop, lowest order in $\hslash$) approximation. Born level states are bound by gauge fields which satisfy the classical field equations. Gauss' law determines a distinct field $A^0(\text{xv})$ for each instantaneous position of the charges. A Poincaré covariant boundary condition for the gluon field leads to a confining potential for $q\bar{q}$ and $qqq$ states. In frames where the bound state is in motion the classical gauge field is obtained by a Lorentz boost of the rest frame field.

    hep-phFew Body Syst.(2017)·4 citations
12. 12*

    Simplified dark matter models in the light of AMS-02 antiproton data

    Tong Li🇦🇺

    In this work we perform an analysis of the recent AMS-02 antiproton flux and the antiproton-to-proton ratio in the framework of simplified dark matter models. To predict the AMS-02 observables we adopt the propagation and injection parameters determined by the observed fluxes of nuclei. We assume that the dark matter particle is a Dirac fermionic dark matter, with leptophobic pseudoscalar or axialvector mediator that couples only to Standard Model quarks and dark matter particles. We find that the AMS-02 observations are consistent with the dark matter hypothesis within the uncertainties. The antiproton data prefer a dark matter (mediator) mass in the 700 GeV--5 TeV region for the annihilation with pseudoscalar mediator and greater than 700 GeV (200 GeV--1 TeV) for the annihilation with axialvector mediator, respectively, at about 68% confidence level. The AMS-02 data require an effective dark matter annihilation cross section in the region of 1x10^{-25} -- 1x10^{-24} (1x10^{-25} -- 4x10^{-24}) cm^3/s for the simplified model with pseudoscalar (axialvector) mediator. The constraints from the LHC and Fermi-LAT are also discussed.

    hep-phJHEP(2017)·12 citations
13. 13*

    Anomalous magnetic and weak magnetic dipole moments of the $\tau$ lepton in the simplest little Higgs model

    M. A. Arroyo-Ureña🇲🇽 · G. Hernández-Tomé🇲🇽 · G. Tavares-Velasco🇲🇽

    We obtain analytical expressions, both in terms of parametric integrals and Passarino-Veltman scalar functions, for the one-loop contributions to the anomalous weak magnetic dipole moment (AWMDM) of a charged lepton in the framework of the simplest little Higgs model (SLHM). Our results are general and can be useful to compute the weak properties of a charged lepton in other extensions of the standard model (SM). As a by-product we obtain generic contributions to the anomalous magnetic dipole moment (AMDM), which agree with previous results. We then study numerically the potential contributions from this model to the $\tau$ lepton AMDM and AWMDM for values of the parameter space consistent with current experimental data. It is found that they depend mainly on the energy scale $f$ at which the global symmetry is broken and the $t_{\beta }$ parameter, whereas there is little sensitivity to a mild change in the values of other parameters of the model. While the $\tau$ AMDM is of the order of $10^{-9}$, the real (imaginary) part of its AWMDM is of the order of $10^{-9}$ ($10^{-10}$). These values seem to be out of the reach of the expected experimental sensitivity of future experiments.

    hep-phEPJC(2017)·21 citations
14. 14*

    Semirelativistic approximation to the ${\gamma }^{\ast }N\to N(1520)$ and ${\gamma }^{\ast }N\to N(1535)$ transition form factors

    G. Ramalho🇧🇷

    The representation of the wave functions of the nucleon resonances within a relativistic framework is a complex task. In a nonrelativistic framework the orthogonality between states can be imposed naturally. In a relativistic generalization, however, the derivation of the orthogonality condition between states can be problematic, particularly when the states have different masses. In this work we study the $N(1520)$ and $N(1535)$ states using a relativistic framework. We considered wave functions derived in previous works, but impose the orthogonality between the nucleon and resonance states using the properties of the nucleon, ignoring the difference of masses between the states (semirelativistic approximation). The $N(1520)$ and $N(1535)$ wave functions are then defined without any adjustable parameters and are used to make predictions for the valence quark contributions to the transition form factors. The predictions compare well with the data particularly for high momentum transfer, where the dominance of the quark degrees of freedom is expected.

    hep-phhep-exhep-latnucl-ex+1PRD(2017)·31 citations
15. 15*

    Generalized Beth-Uhlenbeck approach to the equation of state for quark-hadron matter

    D. Blaschke🇷🇺 · A. Dubinin🇵🇱 · L. Turko🇵🇱

    A unified equation of state for quark-hadron matter is presented in the generalized Beth-Uhlenbeck form. It follows from a $\Phi -$derivable approach to the thermodynamic potential where the ansatz for the $\Phi$ functional contains all 2PI diagrams at two-loop order formed with quark cluster Green's functions for quark, diquark, meson and baryon propagators. We present numerical results using an effective model for the generic behaviour of hadron masses and phase shifts at finite temperature which shares basic features with recent developments within the PNJL model for correlations in quark matter. We obtain the transition between a hadron resonance gas phase and the quark gluon plasma where the Mott dissociation of hadrons is encoded in the hadronic phase shifts. The resulting thermodynamics is in very good agreement with recent lattice QCD simulations.

    hep-phnucl-thActa Phys.Polon.Supp.(2017)·14 citations
16. 16*

    Scale invariance of the primordial tensor power spectrum

    Gonzalo A. Palma🇨🇱 · Bastian Pradenas🇨🇱 · Walter Riquelme🇨🇱 · Spyros Sypsas🇨🇱

    Future cosmic microwave background polarization experiments will search for evidence of primordial tensor modes at large angular scales, in the multipole range $4\le \ell \le 50.$ Because in that range there is some mild evidence of departures from scale invariance in the power spectrum of primordial curvature perturbations, one may wonder about the possibility of similar deviations appearing in the primordial power spectrum of tensor modes. Here we address this issue and analyze the possible presence of features in the tensor spectrum resulting from the dynamics of primordial fluctuations during inflation. We derive a general, model independent, relation linking features in the spectra of curvature and tensor perturbations. We conclude that even with large deviations from scale invariance in the curvature power spectrum, the tensor spectrum remains scale invariant for all observational purposes.

    ↳ astro-ph.COgr-qchep-phhep-thPRD(2017)·5 citations
17. 17*

    Methods, Analysis, and the Treatment of Systematic Errors for the Electron Electric Dipole Moment Search in Thorium Monoxide

    ACME Collaboration: Jacob Baron🇺🇸 · Wes C. Campbell🇺🇸 · David DeMille🇺🇸 · John M. Doyle🇺🇸 · Gerald Gabrielse🇺🇸 · Yulia V. Gurevich🇩🇪 · Paul W. Hess🇺🇸 · Nicholas R. Hutzler🇺🇸 · Emil Kirilov🇦🇹 · Ivan Kozyryev🇺🇸 · Brendon R. O'Leary🇺🇸 · Cristian D. Panda🇺🇸 and 5 other authors

    We recently set a new limit on the electric dipole moment of the electron (eEDM) (J. Baron et al., ACME collaboration, Science 343 (2014), 269-272), which represented an order-of-magnitude improvement on the previous limit and placed more stringent constraints on many CP-violating extensions to the Standard Model. In this paper we discuss the measurement in detail. The experimental method and associated apparatus are described, together with the techniques used to isolate the eEDM signal. In particular, we detail the way experimental switches were used to suppress effects that can mimic the signal of interest. The methods used to search for systematic errors, and models explaining observed systematic errors, are also described. We briefly discuss possible improvements to the experiment.

    ↳ physics.atom-phhep-phNew J.Phys.(2017)·71 citations
18. 18*

    Composite Higgs Dynamics on the Lattice

    Claudio Pica🇩🇰 · Vincent Drach🇨🇭 · Martin Hansen🇩🇰 · Francesco Sannino🇩🇰

    We investigate the spectrum of the SU(2) gauge theory with $N_f$ = 2 flavors of fermions in the fundamental representation, in the continuum, using lattice simulations. This model provides a minimal template which has been used for different strongly coupled extensions of the Standard Model ranging from composite (Goldstone) Higgs models to intriguing types of dark matter candidates, such as the SIMPs. Here we will focus on the composite Goldstone Higgs paradigm, for which this model provides a minimal UV complete realization in terms of a new strong sector with fermionic matter. After introducing the relevant Lattice methods used in our simulations, we will discuss our numerical results. We show that this model features a SU(4)/Sp(4) $\sim$ SO(6)/SO(5) flavor symmetry breaking pattern, and estimate the value of its chiral condensate. Finally, we present our results for the mass spectrum of the lightest spin one and zero resonances, analogue to the QCD $\rho$, $a_1$, $\sigma$, ${\eta }^{\prime }$, $a_0$ resonances, which are relevant for searches of new, exotic resonances at the LHC.

    ↳ hep-lathep-phEPJ Web Conf.(2017)·27 citations
19. 19*

    From C to Parton Sea: Bjorken-x Dependence of the PDFs

    Huey-Wen Lin🇺🇸

    Studying the structure of nucleons is not only important to understanding the strong interactions of quarks and gluons, but also to improving the precision of new-physics searches. Since a broad class of experiments, including the LHC and dark-matter detection, require Standard-Model backgrounds with parton distribution functions (PDFs) as inputs for disentangling SM contributions from potential new physics. For a long time, lattice calculations of the PDFs (as well as many hadron structures) has been limited to the first few moments. In this talk, we present a first direct calculation of the Bjorken-x dependence of the PDFs using Large-Momentum Effective Theory (LaMET). An exploratory study of the antiquark/sea flavor asymmetry of these distributions will be discussed. This breakthrough opens an exciting new frontier calculating more complicated quantities, such as gluon structure and transverse-momentum dependence, which will complement existing theoretical programs for the upcoming Electron-Ion Collider (EIC) or Large Hadron-Electron Collider (LHeC).

    ↳ hep-lathep-phPoS(2016)·7 citations
20. 20*

    Inflationary electroweak/particle phase transitions and new classical gravitational waves on CMB

    Sichun Sun🇨🇳

    Particle phase transitions in the early universe including electroweak and grand unification ones are well-studied subjects. We point out that there are new possible particle phase transitions around inflation. Those new inflationary particle phase transitions, if of the first order, may yield low-frequency gravitational waves (GWs) due to bubble dynamics, leaving imprints on the cosmic microwave background (CMB). In contrast to the nearly scale-invariant primordial GWs caused by vacuum fluctuation, these bubble-generated GWs are classical and have scale dependent B-mode spectra. If decoupled from inflaton, the electroweak phase transition during inflation may serve as a mirror image of the one after reheating where the baryon asymmetry could be generated via electroweak baryogenesis (EWBG). The second new electroweak phase transition may also be the source for EWBG.

    ↳ astro-ph.COgr-qchep-ph0 citations
21. 21*

    A New Test of Lorentz Invariance Violation: the Spectral Lag Transition of GRB 160625B

    Jun-Jie Wei🇨🇳 · Bin-Bin Zhang🇪🇸 · Lang Shao🇨🇳 · Xue-Feng Wu🇨🇳 · Peter Mészáros🇺🇸

    Possible violations of Lorentz invariance (LIV) have been investigated for a long time using the observed spectral lags of gamma-ray bursts (GRBs). However, these generally have relied on using a single photon in the highest energy range. Furthermore, the search for LIV lags has been hindered by our ignorance concerning the intrinsic time lag in different energy bands. GRB 160625B, the only burst so far with a well-defined transition from $positive$ lags to $negative$ lags provides a unique opportunity to put new constraints on LIV. Using multi-photon energy bands we consider the contributions to the observed spectral lag from both the intrinsic time lag and the lag by LIV effects, and assuming the intrinsic time lag to have a positive dependence on the photon energy, we obtain robust limits on LIV by directly fitting the spectral lag data of GRB 160625B. Here we show that these robust limits on the quantum gravity energy scales are $E_{\mathrm{QG},1}\ge 0.5\times 10^{16}$ GeV for the linear, and $E_{\mathrm{QG},2}\ge 1.4\times 10^7$ GeV for the quadratic LIV effects, respectively. In addition, we give for the first time a reasonable formulation of the intrinsic energy-dependent time lag.

    ↳ astro-ph.HEgr-qchep-phhep-thApJL(2017)·64 citations
22. 22*

    Bell violation in primordial cosmology

    Sayantan Choudhury🇮🇳 · Sudhakar Panda🇮🇳 · Rajeev Singh🇮🇳

    In this paper, we have worked on the possibility of setting up an Bell's inequality violating experiment in the context of primordial cosmology following the fundamental principles of quantum mechanics. To set up this proposal we have introduced a model independent theoretical framework using which we have studied the creation of new massive particles for the scalar fluctuations in the presence of additional time dependent mass parameter. Next we explicitly computed the one point and two point correlation functions from this setup. Then we comment on the measurement techniques of isospin breaking interactions of newly introduced massive particles and its further prospects. After that, we give an example of string theory originated axion monodromy model in this context. Finally, we provide a bound on the heavy particle mass parameter for any arbitrary spin field.

    ↳ hep-thastro-ph.COgr-qchep-ph+1Universe(2017)·37 citations
23. 23*

    LHC results and hadronic interaction models

    Sergey Ostapchenko🇩🇪

    The present status of high energy cosmic ray interaction models is discussed, concentrating on recent model updates inspired by the data from Run 1 of the LHC. A special attention is devoted to the remaining differences in the model predictions and their relation to the underlying theoretical approaches. Opportunities for the model discrimination by future LHC and cosmic ray experimental studies are analyzed.

    ↳ astro-ph.HEhep-ph23 citations
24. 24*

    Chern-Simons 5-form and Holographic Baryons

    Pak Hang Chris Lau🇺🇸 · Shigeki Sugimoto🇯🇵

    In the top-down holographic model of QCD based on D4/D8-branes in type IIA string theory and some of the bottom up models, the low energy effective theory of mesons is described by a 5 dimensional Yang-Mills-Chern-Simons theory in a certain curved background with two boundaries. The 5 dimensional Chern-Simons term plays a crucial role to reproduce the correct chiral anomaly in 4 dimensional massless QCD. However, there are some subtle ambiguities in the definition of the Chern-Simons term for the cases with topologically non-trivial gauge bundles, which include the configurations with baryons. In particular, for the cases with three flavors, it was pointed out by Hata and Murata that the naive Chern-Simons term does not lead to an important constraint on the baryon spectrum, which is needed to pick out the correct baryon spectrum observed in nature. In this paper, we propose a formulation of well-defined Chern-Simons term which can be used for the cases with baryons, and show that it recovers the correct baryon constraint as well as the chiral anomaly in QCD.

    ↳ hep-thhep-phPRD(2017)·20 citations
25. 25*

    Baryon-to-pion ratios within generic (non)extensive statistics

    Abdel Nasser Tawfik (Egyptian Ctr. Theor. Phys., Cairo, WLCAPP, Cairo)🇪🇬

    The successive stages of a high-energy collision are conjectured to end up with chemical and thermal freezeout of the produced particles. We utilize generic (non)extensive statistics which is believed to determine the degree of (non)extensivity through two critical exponents due to possible phase-space modifications. This statistical approach likely manifests various types of correlations and fluctuations and also possible interactions among the final-state produced particles. We study the baryon-to-pion ratios at top RHIC and LHC energies including the so-called proton anomaly.

    ↳ nucl-thhep-phPoS(2017)·3 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.