Wed·Oct 12, 2016Wednesday·October 12, 2016

1. 01*

   Vector-like Quarks at the Origin of Light Quark Masses and Mixing

   Francisco J. Botella🇪🇸 · G. C. Branco🇵🇹 · Miguel Nebot🇵🇹 · M. N. Rebelo🇵🇹 · J. I. Silva-Marcos🇵🇹

   We show how a novel fine-tuning problem present in the Standard Model can be solved through the introduction of a single flavour symmetry G, together with three $Q=-1/3$ quarks, three $Q=2/3$ quarks, as well as a complex singlet scalar. The symmetry G is extended to the additional fields and it is an exact symmetry of the Lagrangian, only spontaneously broken by the vacuum. Specific examples are given and a phenomenological analysis of the main features of the model is presented. It is shown that even for vector-like quarks with masses accessible at the LHC, one can have realistic quark masses and mixing, while respecting the strict constraints on process arising from flavour changing neutral currents (FCNC). The vector-like quark decay channels are also described.

   hep-phEPJC(2017)·32 citations
2. 02*

   Quark correlations in the Color Glass Condensate: Pauli blocking and the ridge

   Tolga Altinoluk🇵🇹 · Nestor Armesto🇪🇸 · Guillaume Beuf🇮🇹 · Alex Kovner🇺🇸 · Michael Lublinsky🇮🇱

   We consider, for the first time, correlations between produced quarks in p-A collisions in the framework of the Color Glass Condensate. We find a quark-quark ridge that shows a dip at $\Delta \eta \sim 2$ relative to the gluon-gluon ridge. The origin of this dip is the short range (in rapidity) Pauli blocking experienced by quarks in the wave function of the incoming projectile. We observe that these correlations, present in the initial state, survive the scattering process. We suggest that this effect may be observable in open charm-open charm correlations at the Large Hadron Collider.

   hep-phPRD(2017)·24 citations
3. 03*

   A closer look at the $R_D$ and $R_{D^{\ast }}$ anomalies

   Debjyoti Bardhan🇮🇳 · Pritibhajan Byakti🇮🇳 · Diptimoy Ghosh🇮🇱

   The measurement of $R_D$ ($R_{D^{\ast }}$), the ratio of the branching fraction of $\overline{B}\to D\tau {\bar{\nu }}_{\tau }(\overline{B}\to D^{\ast }\tau {\bar{\nu }}_{\tau })$ to that of $\overline{B}\to Dl{\bar{\nu }}_l(\overline{B}\to D^{\ast }l{\bar{\nu }}_l)$, shows $1.9\sigma$ $(3.3\sigma )$ deviation from its Standard Model (SM) prediction. The combined deviation is at the level of $4\sigma$ according to the Heavy Flavour Averaging Group (HFAG). In this paper, we perform an effective field theory analysis (at the dimension-6 level) of these potential New Physics (NP) signals assuming $\mathrm{SU}(3{)}_{\mathrm{C}}\times \mathrm{SU}(2{)}_{\mathrm{L}}\times \mathrm{U}(1{)}_{\mathrm{Y}}$ gauge invariance. We first show that, in general, $R_D$ and $R_{D^{\ast }}$ are theoretically independent observables and hence, their theoretical predictions are not correlated. We identify the operators that can explain the experimental measurements of $R_D$ and $R_{D^{\ast }}$ individually and also together. Motivated by the recent measurement of the $\tau$ polarisation in $\overline{B}\to D^{\ast }\tau {\bar{\nu }}_{\tau }$ decay, $P_{\tau }(D^{\ast })$ by the Belle collaboration, we study the impact of a more precise measurement of $P_{\tau }(D^{\ast })$ (and a measurement of $P_{\tau }(D)$) on the various possible NP explanations. Furthermore, we show that the measurement of $R_{D^{\ast }}$ in bins of $q^2$, the square of the invariant mass of the lepton-neutrino system, along with the information on $\tau$ polarisation and the forward-backward asymmetry of the $\tau$ lepton, can completely distinguish the various operator structures. We also provide the full expressions of the double differential decay widths for the individual $\tau$ helicities in the presence of all the 10 dimension-6 operators that can contribute to these decays.

   hep-phhep-exJHEP(2017)·114 citations
4. 04*

   Impact of Mass Generation for Simplified Dark Matter Models

   Nicole F. Bell🇦🇺 · Yi Cai🇦🇺 · Rebecca K. Leane🇦🇺

   In the simplified dark matter models commonly studied, the mass generation mechanism for the dark fields is not typically specified. We demonstrate that the dark matter interaction types, and hence the annihilation processes relevant for relic density and indirect detection, are strongly dictated by the mass generation mechanism chosen for the dark sector particles, and the requirement of gauge invariance. We focus on the class of models in which fermionic dark matter couples to a spin-1 vector or axial-vector mediator. However, in order to generate dark sector mass terms, it is necessary in most cases to introduce a dark Higgs field and thus a spin-0 scalar mediator will also be present. In the case that all the dark sector fields gain masses via coupling to a single dark sector Higgs field, it is mandatory that the axial-vector coupling of the spin-1 mediator to the dark matter is non-zero; the vector coupling may also be present depending on the charge assignments. For all other mass generation options, only pure vector couplings between the spin-1 mediator and the dark matter are allowed. If these coupling restrictions are not obeyed, unphysical results may be obtained such as a violation of unitarity at high energies. These two-mediator scenarios lead to important phenomenology that does not arise in single mediator models. We survey two-mediator dark matter models which contain both vector and scalar mediators, and explore their relic density and indirect detection phenomenology.

   hep-phastro-ph.COJCAP(2017)·66 citations
5. 05*

   Evolution of the Baryon Asymmetry through the Electroweak Crossover in the Presence of a Helical Magnetic Field

   Kohei Kamada🇺🇸 · Andrew J. Long🇺🇸

   We elaborate upon the model of baryogenesis from decaying magnetic helicity by focusing on the evolution of the baryon number and magnetic field through the Standard Model electroweak crossover. The baryon asymmetry is determined by a competition between the helical hypermagnetic field, which sources baryon number, and the electroweak sphaleron, which tends to wash out baryon number. At the electroweak crossover both of these processes become inactive; the hypermagnetic field is converted into an electromagnetic field, which does not source baryon number, and the weak gauge boson masses grow, suppressing the electroweak sphaleron reaction. An accurate prediction of the relic baryon asymmetry requires a careful treatment of the crossover. We extend our previous study [K. Kamada and A. J. Long, Phys. Rev. D94, 065301 (2016), arXiv:1606.08891[astro-ph.CO]], taking into account the gradual conversion of the hypermagnetic into the electromagnetic field. If the conversion is not completed by the time of sphaleron freeze-out, as both analytic and numerical studies suggest, the relic baryon asymmetry is enhanced compared to previous calculations. The observed baryon asymmetry of the Universe can be obtained for a primordial magnetic field that has a present-day field strength and coherence length of $B_0\sim 10^{-17}\mathrm{G}$ and ${\lambda }_0\sim 10^{-3}\mathrm{pc}$ and a positive helicity. For larger $B_0$ the baryon asymmetry is overproduced, which may be in conflict with blazar observations that provide evidence for an intergalactic magnetic field of strength $B_0\gtrsim 10^{-14\sim 16}\mathrm{G}$.

   hep-phastro-ph.COhep-thPRD(2016)·114 citations
6. 06*

   Asymptotically safe and free chiral theories with and without scalars

   Esben Molgaard🇩🇰 · Francesco Sannino🇩🇰

   We unveil the dynamics of four dimensional chiral gauge-Yukawa theories featuring several scalar degrees of freedom transforming according to distinct representations of the underlying gauge group. We consider generalized Georgi-Glashow and Bars-Yankielowicz theories. We determine, to the maximum known order in perturbation theory, the phase diagram of these theories and further disentangle their ultraviolet asymptotic nature according to whether they are asymptotically free or safe. We therefore extend the number of theories that are known to be fundamental in the Wilsonian sense to the case of chiral gauge theories with scalars.

   hep-phhep-lathep-thPRD(2017)·23 citations
7. 07*

   Exploring the Hyperchargeless Higgs Triplet Model up to the Planck Scale

   Najimuddin Khan🇮🇳

   We examine an extension of the SM Higgs sector by a Higgs triplet taking into consideration the Higgs-like particle discovery at the LHC with mass around 125 GeV. We evaluate the bounds on the scalar potential through the unitarity of the scattering-matrix. Considering with and without ${\mathbb{Z}}_2$-symmetry on the extra triplet, we derive constraints on the parameter space. We identify the region of the parameter space that corresponds to the stability and metastability of the electroweak vacuum. We also show that at large field values the scalar potential of this model is suitable to explain inflation.

   hep-phEPJC(2018)·65 citations
8. 08*

   An approach to calculation of mass spectra and two-photon decays of $c\overline{c}$ mesons in the framework of Bethe-Salpeter Equation

   Shashank Bhatnagar🇪🇹 · Lmenew Alemu🇪🇹

   In this work we calculate the mass spectrum of charmonium for $1P,...,3P$ states of $0^{++}$ , $1^{++}$, as well as for $1S,...,4S$ states of $0^{-+}$, and $1S,...,5D$ states of $1^{--}$ along with the two-photon decay widths of ground and first excited state of $0^{++}$ quarkonia for the process, $O^{++}\to \gamma \gamma$ in the framework of a QCD motivated Bethe-Salpeter Equation. In this $4\times 4$ BSE framework, the coupled Salpeter equations are first shown to decouple for the confining part of interaction, under heavy-quark approximation, and analyically solved, and later the one-gluon-exchange interaction is perturbatively incorporated leading to mass spectral equations for various quarkonia. The analytic forms of wave functions obtained are used for calculation of two-photon decay widths of ${\chi }_{c0}$. Our results are in reasonable agreement with data (where ever available) and other models.

   hep-phPRD(2018)·26 citations
9. 09*

   Partonic structure of proton in the resonance region

   Jianhong Ruan🇨🇳 · Rong Wang🇨🇳 · Xurong Chen🇨🇳 · Wei Zhu🇨🇳

   We separate the contributions of parton distributions from higher twist corrections to the deeply inelastic lepton-proton scattering in the resonance region using the Jefferson Lab data at low $Q^2$. The study indicates that the concept of the valence quarks and their distributions are indispensable even at $Q^2<1Ge{V}^2$. The quark-hadron duality is also discussed.

   hep-ph0 citations
10. 10*

    Strongly interacting matter from holographic QCD model

    Yidian Chen🇨🇳 · Danning Li🇨🇳 · Mei Huang🇨🇳

    We introduce the 5-dimension dynamical holographic QCD model, which is constructed in the graviton-dilaton-scalar framework with the dilaton background field $\Phi$ and the scalar field $X$ responsible for the gluodynamics and chiral dynamics, respectively. We review our results on the hadron spectra including the glueball and light meson spectra, QCD phase transitions and transport properties in the framework of the dynamical holographic QCD model.

    hep-phhep-lathep-thnucl-thEPJ Web Conf.(2016)·1 citation
11. 11*

    Searches for the FCNC couplings from top-Higgs associated production signal with $h\to \gamma \gamma$ at the LHC

    Yao-Bei Liu🇨🇳 · Zhen-Jun Xiao🇨🇳

    In this paper, we study the observability of the top-Higgs flavor changing neutral current (FCNC) $tqh$ coupling through the process $pp\to qg\to t(\to {\ell }^{+}b\nu )h(\to \gamma \gamma )$ at the Large Hadron Collider~(LHC), where $\ell =e,\mu$. Our numerical results show that, in some parameter regions, the LHC may observe the above signals at the $5\sigma$ level. Otherwise, the branching ratios $Br(t\to uh)$ and $Br(t\to ch)$ can be respectively probed to $0.036\%$ and $0.13\%$ at $3\sigma$ level at 14 TeV LHC with the high integrated luminosity of 3000 fb${}^{-1}$. On the other hand, studying the charge ratio for the lepton in top quark decay can be not only used to discriminate between signal and backgrounds, but also used to discriminate between $tuh$ and $tch$ couplings, for which anomalous single top production comes from the up initiated channel and charm initiated channel.

    hep-phPLB(2016)·16 citations
12. 12*

    Resonance poles and threshold energies for hadron physical problems by a model-independent universal algorithm

    Ralf-Arno Tripolt🇮🇹 · Idan Haritan🇮🇱 · Jochen Wambach🇮🇹 · Nimrod Moiseyev🇮🇱

    We show how complex resonance poles and threshold energies for systems in hadron physics can be accurately obtained by using a method based on the Padé-approximant which was recently developed for the calculation of resonance poles for atomic and molecular auto-ionization systems. The main advantage of this method is the ability to calculate the resonance poles and threshold energies from \emph{real} spectral data. In order to demonstrate the capabilities of this method we apply it here to an analytical model as well as to experimental data for the squared modulus of the vector pion form factor, the S0 partial wave amplitude for $\pi \pi$ scattering and the cross section ratio $R(s)$ for $e^{+}{e}^{-}$ collisions. The extracted values for the resonance poles of the $\rho (770)$ and the $f_0(500)$ or $\sigma$ meson are in very good agreement with the literature. When the data are noisy the prediction of decay thresholds proves to be less accurate but feasible.

    hep-phnucl-thPLB(2017)·76 citations
13. 13*

    Ratchet Baryogenesis with an Analogy to the Forced Pendulum

    Kazuharu Bamba🇯🇵 · Neil D. Barrie🇦🇺 · Akio Sugamoto🇯🇵 · Tatsu Takeuchi🇺🇸 · Kimiko Yamashita🇯🇵

    A new scenario of baryogenesis via the ratchet mechanism is proposed based on an analogy to the forced pendulum. The oscillation of the inflaton field during the reheating epoch after inflation plays the role of the driving force, while the phase $\theta$ of a scalar baryon field (a complex scalar field with baryon number) plays the role of the angle of the pendulum. When the inflaton is coupled to the scalar baryon, the behavior of the phase $\theta$ can be analogous to that of the angle of the forced pendulum. If the oscillation of the driving force is adjusted to the pendulum's motion, a directed rotation of the pendulum is obtained with a non-vanishing value of $\dot{\theta }$, which models successful baryogenesis since $\dot{\theta }$ is proportional to the baryon number density. Similar ratchet models which lead to directed motion have been used in the study of molecular motors in biology. There, the driving force is supplied by chemical reactions, while in our scenario this role is played by the inflaton during the reheating epoch. Keywords: Baryogenesis; Reheating; Inflaton; Ratchet Model; Forced Rotating Pendulum

    hep-phMod.Phys.Lett.A(2018)·11 citations
14. 14*

    Lorentz-violating neutral-pion decays in isotropic modified Maxwell theory

    F.R. Klinkhamer🇩🇪

    We consider an extension of the Standard Model with isotropic nonbirefringent Lorentz violation in the photon sector and restrict the discussion to the case of a "fast" photon with a phase velocity larger than the maximum attainable velocity of the quarks and leptons. With our conventions, this case corresponds to a negative Lorentz-violating parameter $\kappa$ in the action. The decay rate of a neutral pion into two nonstandard photons is calculated as a function of the 3-momentum of the initial pion and the negative Lorentz-violating parameter $\kappa$ of the final photons.

    hep-phMod.Phys.Lett.A(2018)·13 citations
15. 15*

    Strange quark asymmetry in the proton in chiral effective theory

    X.G. Wang🇦🇺 · Chueng-Ryong Ji🇺🇸 · W. Melnitchouk🇺🇸 · Y. Salamu🇨🇳 · A.W. Thomas🇦🇺 · P. Wang🇨🇳

    We perform a comprehensive analysis of the strange-antistrange parton distribution function (PDF) asymmetry in the proton in the framework of chiral effective theory, including the full set of lowest order kaon loop diagrams with off-shell and contact interactions, in addition to the usual on-shell contributions previously discussed in the literature. We identify the presence of $\delta$-function contributions to the $\bar{s}$ PDF at $x=0$, with a corresponding valence-like component of the $s$-quark PDF at larger $x$, which allows greater flexibility for the shape of $s-\bar{s}$. Expanding the moments of the PDFs in terms of the pseudoscalar kaon mass, we compute the leading nonanalytic behavior of the number and momentum integrals of the $s$ and $\bar{s}$ distributions, consistent with the chiral symmetry of QCD. We discuss the implications of our results for the understanding of the NuTeV anomaly and for the phenomenology of strange quark PDFs in global QCD analysis.

    hep-phhep-exnucl-thPRD(2016)·37 citations
16. 16*

    Measuring Masses in Semi-Invisible Final States at Electron-Positron Colliders

    Qian-Fei Xiang🇨🇳 · Xiao-Jun Bi🇨🇳 · Qi-Shu Yan🇨🇳 · Peng-Fei Yin🇨🇳 · Zhao-Huan Yu🇦🇺

    Mass measurement of a particle whose decay products including invisible particles is a challenging task at colliders. For a new physics model involving a dark matter candidate $N$ and a $Z_2$ symmetry that stabilizes it, a typical new process at $e^{+}{e}^{-}$ colliders is the pair production $e^{+}{e}^{-}\to Y\bar{Y}$ followed by decay processes $Y\to aN$ and $\bar{Y}\to b\bar{N}$, where $a$ and $b$ are visible but $N$ is invisible. In this work, we propose a new method to measure the physical masses in this topology by making use of the kinematic equations given by momentum-energy conservation and on-shell conditions. For each event, the solvability of these equations determines a limited region on the trial $m_Y$-$m_N$ plane. The edge of this region can be used to define two variables, $m_Y^{\mathrm{edge}}$ and $m_N^{\mathrm{edge}}$, whose distributions are utilized to derive the measurement values of $m_Y$ and $m_N$. The measurement deviations and uncertainties are also estimated after including detector effects and background contamination.

    hep-phPRD(2017)·9 citations
17. 17*

    Dark Matter in a Constrained $E_6$ Inspired SUSY Model

    P. Athron (1)🇦🇺 · D. Harries (2)🇦🇺 · R. Nevzorov (2)🇦🇺 · A. G. Williams (2) ((1) Monash University, (2) University of Adelaide)🇦🇺

    We investigate dark matter in a constrained $E_6$ inspired supersymmetric model with an exact custodial symmetry and compare with the CMSSM. The breakdown of $E_6$ leads to an additional $U(1{)}_N$ symmetry and a discrete matter parity. The custodial and matter symmetries imply there are two stable dark matter candidates, though one may be extremely light and contribute negligibly to the relic density. We demonstrate that a predominantly Higgsino, or mixed bino-Higgsino, neutralino can account for all of the relic abundance of dark matter, while fitting a 125 GeV SM-like Higgs and evading LHC limits on new states. However we show that the recent LUX 2016 limit on direct detection places severe constraints on the mixed bino-Higgsino scenarios that explain all of the dark matter. Nonetheless we still reveal interesting scenarios where the gluino, neutralino and chargino are light and discoverable at the LHC, but the full relic abundance is not accounted for. At the same time we also show that there is a huge volume of parameter space, with a predominantly Higgsino dark matter candidate that explains all the relic abundance, that will be discoverable with XENON1T. Finally we demonstrate that for the $E_6$ inspired model the exotic leptoquarks could still be light and within range of future LHC searches.

    hep-phJHEP(2016)·37 citations
18. 18*

    Constraints on Gravitation from Causality and Quantum Consistency

    Mark P. Hertzberg🇺🇸

    We examine the role of consistency with causality and quantum mechanics in determining the properties of gravitation. We begin by examining two different classes of interacting theories of massless spin 2 particles -- gravitons. One involves coupling the graviton with the lowest number of derivatives to matter, the other involves coupling the graviton with higher derivatives to matter, making use of the linearized Riemann tensor. The first class requires an infinite tower of terms for consistency, which is known to lead uniquely to general relativity. The second class only requires a finite number of terms for consistency, which appears as another class of theories of massless spin 2. We recap the causal consistency of general relativity and show how this fails in the second class for the special case of coupling to photons, exploiting related calculations in the literature. In a companion paper [1] this result is generalized to a much broader set of theories. Then, as a causal modification of general relativity, we add light scalar particles and recap the generic violation of universal free-fall they introduce and its quantum resolution. This leads to a discussion of a special type of scalar-tensor theory; the $F(\mathcal{R})$ models. We show that, unlike general relativity, these models do not possess the requisite counterterms to be consistent quantum effective field theories. Together this helps to remove some of the central assumptions made in deriving general relativity.

    ↳ hep-thastro-ph.COgr-qchep-phAdv.High Energy Phys.(2018)·18 citations
19. 19*

    Novel dark matter constraints from antiprotons in the light of AMS-02

    Alessandro Cuoco🇩🇪 · Michael Krämer🇩🇪 · Michael Korsmeier🇩🇪

    We evaluate dark matter (DM) limits from cosmic-ray antiproton observations using the recent precise AMS-02 measurements. We properly take into account cosmic-ray propagation uncertainties fitting at the same time DM and propagation parameters, and marginalizing over the latter. We find a significant (~4.5 sigma) indication of a DM signal for DM masses near 80 GeV, with a hadronic annihilation cross-section close to the thermal value, sigma v ~3e-26 cm3s-1. Intriguingly, this signal is compatible with the DM interpretation of the Galactic center gamma-ray excess. Confirmation of the signal will require a more accurate study of the systematic uncertainties, i.e., the antiproton production cross-section, and modelling of the solar modulation effect. Interpreting the AMS-02 data in terms of upper limits on hadronic DM annihilation, we obtain strong constraints excluding a thermal annihilation cross-section for DM masses below about 50 GeV and in the range between approximately 150 and 500 GeV, even for conservative propagation scenarios. Except for the range around 80 GeV, our limits are a factor 4 stronger than the limits from gamma-ray observations of dwarf galaxies.

    ↳ astro-ph.HEhep-phPRL(2017)·314 citations
20. 20*

    Spectator fields and their imprints on the Cosmic Microwave Background

    Lingfei Wang🇬🇧

    When a subdominant light scalar field ends slow roll during inflation, but well after the Hubble exit of the pivot scales, it may determine the cosmological perturbations. This thesis investigates how such a scalar field, the spectator, may leave its impact on the Cosmic Microwave Background (CMB) radiation and be consequently constrained. We first introduce the observables of the CMB, namely the power spectrum $P_{\zeta }$, spectral index $n_s$ and its running $d{n}_s/d\ln k$, the non-Gaussianities $f_{NL}$, $g_{NL}$ and ${\tau }_{NL}$, and the lack of isocurvature and polarization modes. Based on these studies, we derive the cosmological predictions for the spectator scenario, revealing its consistency with the CMB for inflection point potentials, hyperbolic tangent potentials, and those with a sudden phase transition. In the end, we utilize the spectator scenario to explain the CMB power asymmetry, with a brief tachyonic fast-roll phase.

    ↳ astro-ph.COgr-qchep-phhep-th1 citation
21. 21*

    Scale-invariant helical magnetic field evolution and the duration of inflation

    Tina Kahniashvili🇺🇸 · Axel Brandenburg🇺🇸 · Ruth Durrer🇨🇭 · Alexander G. Tevzadze🇬🇪 · Winston Yin🇺🇸

    We consider a scale-invariant helical magnetic field generated during inflation. We show that, if the mean magnetic helicity density of such a field is measured, it can be used to determine a lower bound on the duration of inflation. Upper bounds can be used to derive constraints on the minimal duration of inflation if one assumes that the magnetic field generated during inflation is helical. Using three-dimensional simulations, we show that an initially scale-invariant field develops, which is similar both with and without magnetic helicity. In the fully helical case, however, the magnetic field appears to have a more pronounced folded structure.

    ↳ astro-ph.COhep-phJCAP(2017)·30 citations
22. 22*

    CTA in the Context of Searches for Particle Dark Matter - a glimpse

    Jan Conrad (OKC, Stockholm)🇸🇪

    In this contribution, CTAs potential role in detection of particle dark matter in the context of other detection approaches is briefly discussed for an audience of gamma-ray astronomers. In particular searches for new particles at the large hadron collider and detection of dark matter particles in deep underground detectors are considered. We will focus on Weakly Interacting Massive Particles (WIMP). Approaches will be compared in terms of (a) robustness of sensitivity predictions, (b) timeline and (c) reach. The estimate of the reach will be model-dependent. Given our ignorance about the nature of dark matter, and the complementarity of detection techniques even within a given framework (e.g. Supersymmetry), the trivial conclusion is that we might need all approaches and the most sensitive experiments. Our discussion will be somewhat more restrictive in order to be able to be more concrete. With the caveat of incompleteness, under the assumption that the WIMP paradigm describes nature, CTA is more likely to discover multi-TeV WIMP dark matter, whereas for lower masses direct detection and LHC has significantly better prospects. We will illustrate this conclusion with examples from foremost Supersymmetry, but mention effective field theory or simplified models. We will comment on a few models predicting high mass WIMPs, in particular 1 TeV higgsino and wino WIMPs, as well as Minimal Dark Matter and point out the relevance of updated measurements of the anomalous magnetic moment of the muon for CTAs role in searches for Supersymmetry.

    ↳ astro-ph.HEhep-phAIP Conf.Proc.(2017)·4 citations
23. 23*

    Across the deconfinement

    Claudio Bonati🇮🇹 · Massimo D'Elia🇮🇹 · Marco Mariti🇮🇹 · Michele Mesiti🇮🇹 · Francesco Negro🇮🇹 · Francesco Sanfilippo🇬🇧

    The deconfinement transition at vanishing chemical potential can be reliably studied by lattice simulations and its general features are by now well known. On the contrary, what happens at finite density is still largely unknown and we will review the results obtained in the last year regarding the dependence, for small density, of the (pseudo)critical temperature on the baryonic chemical potential.

    ↳ hep-lathep-phhep-thnucl-thActa Phys.Polon.Supp.(2017)·3 citations
24. 24*

    Measurement of the ratio of the sixth order to the second order cumulant of net-proton multiplicity distributions in relativistic heavy-ion collisions

    Lizhu Chen🇨🇳 · Zhiming Li🇨🇳 · Fenping Cui🇨🇳 · Yuanfang Wu🇨🇳

    We investigate the measurement of the sixth order cumulant and its ratio to the second order cumulant ($C_6/C_2$) in relativistic heavy-ion collisions. The influence of statistics and different methods of centrality bin width correction on $C_6/C_2$ of net-proton multiplicity distributions is demonstrated. There is no satisfactory method to extract $C_6/C_2$ with the current statistics recorded at lower energies by STAR at RHIC. With statistics comparable to the expected statistics at the planned future RHIC Beam Energy Scan II (BES II), no energy dependence of $C_6/C_2$ is observed in central collisions using the UrQMD model. We find if the transition signal is as strong as predicted by the PQM model, then it is hopefully observed at the upcoming RHIC BES II.

    ↳ nucl-exhep-phnucl-thNPA(2017)·9 citations
25. 25*

    The Standard-Model Extension and Gravitational Tests

    Jay D. Tasson🇺🇸

    The Standard-Model Extension (SME) provides a comprehensive effective field-theory framework for the study of CPT and Lorentz symmetry. This work reviews the structure and philosophy of the SME and provides some intuitive examples of symmetry violation. The results of recent gravitational tests performed within the SME are summarized including analysis of results from the Laser Interferometer Gravitational-Wave Observatory (LIGO), sensitivities achieved in short-range gravity experiments, constraints from cosmic-ray data, and results achieved by studying planetary ephemerids. Some proposals and ongoing efforts will also be considered including gravimeter tests, tests of the Weak Equivalence Principle, and antimatter experiments. Our review of the above topics is augmented by several original extensions of the relevant work. We present new examples of symmetry violation in the SME and use the cosmic-ray analysis to place first-ever constraints on 81 additional operators.

    ↳ gr-qchep-phSymmetry(2016)·52 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.