Tue·Jun 26, 2018Tuesday·June 26, 2018

1. 01*

   Higgs boson production at large transverse momentum within SMEFT: analytical results

   Massimiliano Grazzini🇨🇭 · Agnieszka Ilnicka🇨🇭 · Michael Spira🇨🇭

   We consider Higgs boson production through gluon fusion at large transverse momentum in hadronic collisions. We present the analytic expressions of the relevant one-loop QCD amplitudes including the effects of the complete set of dimension-six operators. The latter correspond to modifications of the top and bottom Yukawa couplings, to an effective point-like Higgs coupling to gluons and to the chromomagnetic operator of the top quark. The quantitative impact of the chromomagnetic operator is also studied. Our results confirm previous findings that the effect of the chromomagnetic operator at high $p_T$ can be large and should not be neglected.

   hep-phhep-exEPJC(2018)·37 citations
2. 02*

   Measuring the triple Higgs self-couplings in two Higgs doublet model

   Nasuf Sonmez🇹🇷

   The determination of the Higgs self-coupling in the Standard Model is one of the primary motivations among all the future lepton colliders. Extending the scalar sector of the Standard Model by a new Higgs doublet with a quadratic Higgs potential gives many new features to the model, and most importantly additional Higgs self-couplings emerge. Measuring these couplings is the only way to reconstruct the shape of the scalar potential. In this study, the numerical analysis of several scattering processes is carried out for the two-Higgs-doublet model to determine all these Higgs self-couplings. These processes are selected among various possible combinations of additional Higgs states. The computation is carried out in the exact alignment limit ($s_{\beta \alpha }=1$). The distribution of the cross sections is presented regarding the polarization of the incoming beams and up to $\sqrt{s}=3\text{ TeV}$. A strategy for extracting the Higgs self-couplings are considered in 2HDM and at the future lepton colliders. Possible final states that could be used for each of the processes are investigated using the decays of the final state particles.

   hep-phJHEP(2018)·6 citations
3. 03*

   Studying minijets and MPI with rapidity correlations

   Maxim Azarkin🇷🇺 · Piotr Kotko🇵🇱 · Andrzej Siodmok🇵🇱 · Mark Strikman🇺🇸

   We propose and carry a detailed study of an observable sensitive to different mechanisms of minijet production. The class of observables measures how the transverse momenta of hadrons produced in association with various trigger objects are balanced as a function of rapidity. It is shown that the observables are sensitive to the model parameters relevant to the minijet production mechanisms: low-$p_{\mathrm{T}}$ cut-off regulating jet cross-section, transverse distribution of partons in protons, and parton distribution functions. We perform our test at different charge-particle multiplicities and collision energies. The MC models, which describe many features of the LHC data, are found to predict quite different results demonstrating high discriminating power of the proposed observables. We also review mechanisms and components of \sc{Herwig}, \sc{Pythia}, and \sc{Sherpa} Monte Carlo models relevant to the minijet production.

   hep-phEPJC(2019)·4 citations
4. 04*

   Conformal GUT inflation, proton lifetime and non-thermal leptogenesis

   K. Sravan Kumar🇵🇹 · Paulo Vargas Moniz🇵🇹

   In this paper, we generalize Coleman-Weinberg (CW) inflation in grand unified theories (GUTs) such as $\text{SU}(5)$ and $\text{SO}(10)$ by means of considering two complex singlet fields with conformal invariance. In this framework, inflation emerges from a spontaneously broken conformal symmetry. The GUT symmetry implies a potential with a CW form, as a consequence of radiative corrections. The conformal symmetry flattens the above VEV branch of the CW potential to a Starobinsky plateau. As a result, we obtain $n_s\sim 1-\frac{2}{N}$ and $r\sim \frac{12}{N^2}$ for $N\sim 50-60$ e-foldings. Furthermore, this framework allow us to estimate the proton lifetime as ${\tau }_p\lesssim 10^{40}$ years, whose decay is mediated by the superheavy gauge bosons. Moreover, we implement a type I seesaw mechanism by weakly coupling the complex singlet, which carries two units of lepton number, to the three generations of singlet right handed neutrinos (RHNs). The spontaneous symmetry breaking of global lepton number amounts to the generation of neutrino masses. We also consider non-thermal leptogenesis in which the inflaton dominantly decays into heavy RHNs that sources the observed baryon asymmetry. We constrain the couplings of the inflaton field to the RHNs, which gives the reheating temperature as $10^6\text{ GeV}\lesssim T_R<10^9$ GeV.

   hep-phastro-ph.COhep-thEPJC(2019)·21 citations
5. 05*

   On Neutrino Mixing in Matter and CP and T Violation Effects in Neutrino Oscillations

   S. T. Petcov🇮🇹 · Ye-Ling Zhou🇬🇧

   Aspects of 3-neutrino mixing and oscillations in vacuum and in matter with constant density are investigated working with a real form of the neutrino Hamiltonian. We find the (approximate) equalities ${\theta }_{23}^m={\theta }_{23}$ and ${\delta }^m=\delta$, ${\theta }_{23}$ (${\theta }_{23}^m$) and $\delta$ (${\delta }^m$) being respectively the atmospheric neutrino mixing angle and the Dirac CP violation phase in vacuum (in matter) of the neutrino mixing matrix, which are shown to represent excellent approximations for the conditions of the T2K (T2HK), T2HKK, NO$\nu$A and DUNE neutrino oscillation experiments. A new derivation of the known relation $\sin 2{\theta }_{23}^m\sin {\delta }^m=\sin 2{\theta }_{23}\sin \delta$ is presented and it is used to obtain a correlation between the shifts of ${\theta }_{23}$ and $\delta$ due to the matter effect. A derivation of the relation between the rephasing invariants which determine the magnitude of CP and T violating effects in 3-flavour neutrino oscillations in vacuum, $J_{\mathrm{CP}}$, and of the T violating effects in matter with constant density, $J_{\mathrm{T}}^m\equiv J^m$, reported in \cite{Krastev:1988yu} without a proof, is presented. It is shown that the function $F$ which appears in this relation, $J^m=J_{\mathrm{CP}}F$, and whose explicit form was given in \cite{Krastev:1988yu}, coincides with the function $\tilde{F}$ in the similar relation $J^m=J_{\mathrm{CP}}\tilde{F}$ derived in \cite{Naumov:1991ju}, although $F$ and $\tilde{F}$ are expressed in terms of different sets of neutrino mass and mixing parameters and have completely different forms.

   hep-phPLB(2018)·24 citations
6. 06*

   Flavor-dependent EMC effect from a nucleon swelling model

   Rong Wang🇫🇷 · Raphaël Dupre🇫🇷 · Yin Huang🇨🇳 · Baiyang Zhang🇨🇳 · Silvia Niccolai🇫🇷

   We present our results for a flavor-dependent EMC effect based on the nIMParton nuclear PDFs, in which the $x$-dependence is described with a nucleon swelling model. The nuclear correction from nucleon swelling is considered through a modification of the initial valence quark distributions instead of a dynamical rescaling. To probe the flavor-dependence of the model, the experimental observables are calculated applying nIMParton nuclear modifications for various experiments: parity-violating deep inelastic scattering on nuclear target, pion-induced Drell-Yan, and W-boson production in proton-nucleus collisions. In addition, we present the expected effect for the spectator-tagged deep inelastic scattering process, which will be performed by the CLAS12 collaboration with the ALERT detector.

   hep-phnucl-thPRC(2019)·11 citations
7. 07*

   Boosted Self-interacting Dark Matter in a Multi-component Dark Matter Model

   Mayumi Aoki🇯🇵 · Takashi Toma🇩🇪

   In models of multi-component dark matter, the lighter component of dark matter can be boosted by annihilations of the heavier state if mass splitting is large enough. Such relativistic dark matter can be detectable via large neutrino detectors such as Super-Kamiokande and IceCube. Moreover, if the process is inelastic scattering and decay length of the produced particle is short enough, another signature coming from the decay can also be detectable. In this paper, we construct a simple two-component dark matter model with a hidden U(1)_D gauge symmetry where the lighter component of dark matter has a potential to improve the so-called small scale structure problems with large self-interacting cross section. We estimate number of multi-Cherenkov ring events due to both of the boosted dark matter and subsequent decay of the particle produced by inelastic scattering at Hyper-Kamiokande future experiment. Some relevant constraints, such as dark matter direct detection and cosmological observations, are also taken into account. The numerical analysis shows that some parameter space which can induce large self-interacting cross section can give a few multi-Cherenkov ring events per year at Hyper-Kamiokande.

   hep-phJCAP(2018)·51 citations
8. 08*

   Biprobability approach to CP phase degeneracy from non-standard neutrino interactions

   Jeffrey M. Hyde🇺🇸

   Non-standard interactions (NSI) between neutrinos and matter at long-baseline experiments could make determination of the CP-violating phase ${\delta }_{13}$ ambiguous due to interference with additional complex phases. Such degeneracies are often studied in the context of specific experiments and a few parameter choices, leaving it unclear how to extract a general understanding of when two sets of parameters may be degenerate or how different types of experiments in principle combine to lift such a degeneracy. This work complements detailed simulations of individual experiments by showing how underlying parameters relate to degeneracies as represented on a biprobability plot. We show how a range of energies near the oscillation maximum ${\Delta }_{31}=\pi /2$ separates some degenerate probabilities along the CP-conserving direction of biprobability space according to ${\delta }_{+}\equiv {\delta }_{13}+{\delta }_{e\tau }$, while near ${\Delta }_{31}=3\pi /2$ degenerate probabilities are separated along the CP-violating direction according to ${\delta }_{e\tau }$. We apply this to the experimental hints that suggest ${\delta }_{13}\sim -\pi /2$ to see that this could also be consistent with ${\delta }_{13},{\delta }_{e\tau }=0$ or $\pi$. The baseline and energy range characteristic of DUNE provides some resolution, but a further improvement comes from beams a few degrees off-axis at $\gtrsim 1000$ km baselines, including some proposed sites for T2HKK.

   hep-phNPB(2019)·18 citations
9. 09*

   Discovery potential of stable and near-threshold doubly heavy tetraquarks at the LHC

   Ahmed Ali🇩🇪 · Qin Qin🇩🇪 · Wei Wang🇨🇳

   We study the LHC discovery potential of the double-bottom tetraquarks $bb\bar{u}\bar{d}$, $bb\bar{u}\bar{s}$ and $bb\bar{d}\bar{s}$, the lightest of which having $J^P=1^{+}$, called $T_{[\bar{u}\bar{d}]}^{\{bb\}}$, $T_{[\bar{u}\bar{s}]}^{\{bb\}}$ and $T_{[\bar{d}\bar{s}]}^{\{bb\}}$, are expected to be stable against strong decays. Employing the Monte Carlo generators MadGraph5$\_$aMC@NLO and Pythia6, we simulate the process $pp\to \bar{b}b\bar{b}b$ and calculate the $bb$-diquark jet configurations, specified by the invariant mass interval $m_{bb}<M_{T_{[\bar{q}{\bar{q}}^{\prime }]}^{\{bb\}}}+\Delta M$. Estimates of $\Delta M$ from the measured product $\sigma (pp\to B_c^{+}+X)\mathcal{B}(B_c^{+}\to J/\psi {\pi }^{+})$ are presented and used to to get the $bb$-diquark jet cross sections in double-bottom hadrons $\sigma (pp\to H_{\{bb\}}+X)$, where $H_{\{bb\}}$ represent tetraquarks and baryons. This is combined with the LHCb data on the fragmentation $b\to {\Lambda }_b$ and $b\to B$ to obtain $\sigma (pp\to T_{[\bar{u}\bar{d}]}^{\{bb\}}+X)=(2.4_{-0.6}^{+0.9})\text{nb}$, and about a half of this for the $T_{[\bar{u}\bar{s}]}^{\{bb\}}$ and $T_{[\bar{d}\bar{s}]}^{\{bb\}}$. We also present estimates of the production cross sections for the mixed bottom-charm tetraquarks, $bc\bar{u}\bar{d}$, $bc\bar{u}\bar{s}$ and $bc\bar{d}\bar{s}$, obtaining $\sigma (pp\to T_{[\bar{u}\bar{d}]}^{[bc]}+X)=(48_{-12}^{+19})\mathrm{nb}$, and the related ones having $T_{[\bar{u}\bar{s}]}^{[bc]}$ and $T_{[\bar{d}\bar{s}]}^{[bc]}$. They have excellent discovery potential at the LHC, as their branching ratios in various charge combinations of $B{D}_{(s)}(\gamma )$ are anticipated to be large.

   hep-phhep-exPLB(2018)·78 citations
10. 10*

    Quark-hadron continuity under rotation: Vortex continuity or boojum?

    Chandrasekhar Chatterjee🇯🇵 · Muneto Nitta🇯🇵 · Shigehiro Yasui🇯🇵

    Quark-hadron continuity was proposed as crossover between hadronic matter and quark matter without a phase transition, based on the matching of the symmetry and excitations in both phases. In the limit of a light strange-quark mass, it connects hyperon matter and the color-flavor-locked (CFL) phase exhibiting color superconductivity. Recently, it was proposed that this conjecture could be generalized in the presence of superfluid vortices penetrating both phases (arXiv:1803.05115 [hep-ph]), and it was suggested that one hadronic superfluid vortex in hyperon matter could be connected to one non-Abelian vortex (color magnetic flux tube) in the CFL phase. Here, we argue that their proposal is consistent only at large distances; instead, we show that three hadronic superfluid vortices must combine with three non-Abelian vortices with different colors with the total color magnetic fluxes canceled out, where the junction is called a colorful boojum. We rigorously prove this in both a macroscopic theory based on the Ginzburg-Landau description in which symmetry and excitations match (including vortex cores), and a microscopic theory in which the Aharonov-Bohm phases of quarks around vortices match.

    hep-phastro-ph.HEcond-mat.supr-conPRD(2019)·39 citations
11. 11*

    $HZ$ associated production with decay in the Alternative Left-Right Model at CEPC and future linear colliders

    Juan-Juan Niu🇨🇳 · Lei Guo🇨🇳 · Shao-Ming Wang🇨🇳

    In this study, Higgs and Z boson associated production with subsequent decay is attempted in the framework of alternative left-right model, which is motivated by superstring-inspired $E_6$ model at CEPC and future linear colliders. We systematically analyze each decay channel of Higgs with theoretical constraints and latest experimental methods. Due to the mixing of scalars in the Higgs sector, charged Higgs bosons can play an essential role in the phenomenological analysis of this process. Even though the predictions of this model for the signal strengths of this process are close to the standard model expectations, it can be distinct under high luminosity.

    hep-phhep-exCPC(2018)·2 citations
12. 12*

    Primordial Black Hole Production in Inflationary Models of Supergravity with a Single Chiral Superfield

    Tie-Jun Gao🇨🇳 · Zong-Kuan Guo🇨🇳

    We propose a double inflection point inflationary model in supergravity with a single chiral superfield. Such a model allows for the generation of primordial black holes(PBHs) at small scales, which can account for a significant fraction of dark matter. Moreover in vacuum it is possible to give a small and adjustable SUSY breaking with a tiny cosmological constant.

    hep-phPRD(2018)·88 citations
13. 13*

    Spectator effects in the HQET renormalization group improved Lagrangian at $\mathcal{O}(1/m^3)$ with leading logarithmic accuracy: Spin-dependent case

    Daniel Moreno🇪🇸

    The present paper incorporates the effects induced by massless spectator quarks in the renormalization group improved Wilson coefficients associated to the $\mathcal{O}(1/m^3)$ spin-dependent heavy quark effective theory Lagrangian operators. The computation is carried out in Coulomb gauge with leading logarithmic precision. The result completes the Lagrangian to $\mathcal{O}(1/m^3)$ with that accuracy.

    hep-phPRD(2018)·8 citations
14. 14*

    Weak pion production off the nucleon in covariant chiral perturbation theory

    De-Liang Yao🇪🇸 · Luis Alvarez-Ruso🇪🇸 · Astrid N. Hiller Blin🇩🇪 · M. J. Vicente Vacas🇪🇸

    Weak pion production off the nucleon at low energies has been systematically investigated in manifestly relativistic baryon chiral perturbation theory with explicit inclusion of the $\Delta$(1232) resonance. Most of the involved low-energy constants have been previously determined in other processes such as pion-nucleon elastic scattering and electromagnetic pion production off the nucleon. For numerical estimates, the few remaining constants are set to be of natural size. As a result, the total cross sections for single pion production on neutrons and protons, induced either by neutrino or antineutrino, are predicted. Our results are consistent with the scarce existing experimental data except in the ${\nu }_{\mu }n\to {\mu }^{-}n{\pi }^{+}$ channel, where higher-order contributions might still be significant. The $\Delta$ resonance mechanisms lead to sizeable contributions in all channels, especially in ${\nu }_{\mu }p\to {\mu }^{-}p{\pi }^{+}$, even though the considered energies are close to the production threshold. The present study provides a well founded low-energy benchmark for phenomenological models aimed at the description of weak pion production processes in the broad kinematic range of interest for current and future neutrino-oscillation experiments.

    hep-phnucl-thPRD(2018)·36 citations
15. 15*

    The speed of sound in QGP and SU(3) Yang-Mills theory

    Z.V Khaidukov🇷🇺 · M.S Lukashov🇷🇺 · Yu.A.Simonov🇷🇺

    The speed of sound $C_s$ in the SU(3) and (2+1)QCD is calculated within the Field Correlator Method using the nonperturbative colour magnetic confinement and Polyakov loop interaction in the deconfined region.The resulting $C_s$ displays a discontinuity at $T=T_c$ in the SU(3) case. It is shown numerically and analytically that $C_s^2$ never exceeds $\frac{1}{3}$ both for SU(3) and (2+1) QCD for vanishing chemical potential.A good agreement is found of our numerical results with the corresponding lattice data.

    hep-phPRD(2018)·21 citations
16. 16*

    The higgsino-singlino sector of the NMSSM: Combined constraints from dark matter and the LHC

    Ulrich Ellwanger🇫🇷 · Cyril Hugonie🇫🇷

    A light singlino is a promising candidate for dark matter, and a light higgsino is natural in the parameter space of the NMSSM. We study the combined constraints on this scenario resulting from the dark matter relic density, the most recent results from direct detection experiments, LEP and the LHC. In particular limits from a recent search for electroweak production of charginos and neutralinos at $\sqrt{s}=13$ TeV after 35.9 fb${}^{-1}$ by CMS and constraints on spin-independent dark matter-nucleon cross sections from XENON1T after one tonne$\times$year exposure are considered. We find that scenarios with higgsino masses below $\sim 250$ GeV as well as singlino masses below $\sim 100$ GeV are strongly constrained depending, however, on assumptions on the bino mass parameter $M_1$. Benchmark points and branching fractions for future searches at the LHC are proposed.

    hep-phEPJC(2018)·47 citations
17. 17*

    Gamma-ray spectral modulations induced by photon-ALP-dark photon oscillations

    Kiwoon Choi🇰🇷 · Sangjun Lee🇰🇷 · Hyeonseok Seong🇰🇷 · Seokhoon Yun🇰🇷

    Recently it has been noticed that the Fermi-LAT data of gamma-rays from some galactic pulsars and supernova remnants reveal spectral modulations that might be explained by the conversion of photons to ALPs (axion-like particles) induced by the conventional ALP coupling to photon in the presence of galactic magnetic fields. However the corresponding ALP mass and coupling are in a severe tension with the observational constraints from CAST, SN1987A, and other gamma-ray observations. Motivated by this, we examine an alternative possibility that those spectral modulations are explained by other type of ALP coupling involving both the ordinary photon and a massless dark photon, when nonzero background dark photon gauge fields are assumed. We find that our scheme results in oscillations among the photon, ALP, and dark photon, which can explain the gamma-ray spectral modulations of galactic pulsars or supernova remnants, while satisfying the known observational constraints.

    hep-phastro-ph.COastro-ph.HEPRD(2020)·30 citations
18. 18*

    Effective-field theory analysis of the ${\tau }^{-}\to {\pi }^{-}{\pi }^0{\nu }_{\tau }$ decays

    J. A. Miranda🇲🇽 · P. Roig🇲🇽

    We perform an effective field theory analysis of the ${\tau }^{-}\to {\pi }^{-}{\pi }^0{\nu }_{\tau }$ decays, that includes the most general interactions between Standard Model fields up to dimension six, assuming left-handed neutrinos. We constrain as much as possible the necessary Standard Model hadronic input using chiral symmetry, dispersion relations, data and asymptotic QCD properties. As a result, we set precise (competitive with low-energy and LHC measurements) bounds on (non-standard) charged current tensor interactions, finding a very small preference for their presence, according to Belle data. Belle-II near future measurements can thus be very useful in either confirming or further restricting new physics tensor current contributions to these decays. For this, the spectrum in the di-pion invariant mass turns out to be particularly promising. Distributions in the angle defined by the ${\tau }^{-}$ and ${\pi }^{-}$ momenta can also be helpful if measured with less than $10\%$ accuracy, both for non-standard scalar and tensor interactions.

    hep-phhep-exJHEP(2018)·65 citations
19. 19*

    Enhanced photon coupling of ALP dark matter adiabatically converted from the QCD axion

    Shu-Yu Ho🇯🇵 · Ken'ichi Saikawa🇩🇪 · Fuminobu Takahashi🇯🇵

    We revisit the adiabatic conversion between the QCD axion and axion-like particle (ALP) at level crossing, which can occur in the early universe as a result of the existence of a hypothetical mass mixing. This is similar to the Mikheyev-Smirnov-Wolfenstein effect in neutrino oscillations. After refining the conditions for the adiabatic conversion to occur, we focus on a scenario where the ALP produced by the adiabatic conversion of the QCD axion explains the observed dark matter abundance. Interestingly, we find that the ALP decay constant can be much smaller than the ordinary case in which the ALP is produced by the realignment mechanism. As a consequence, the ALP-photon coupling is enhanced by a few orders of magnitude, which is advantageous for the future ALP and axion-search experiments using the ALP-photon coupling.

    hep-phastro-ph.COhep-thJCAP(2018)·50 citations
20. 20*

    Local Analytic Sector Subtraction at NNLO

    Lorenzo Magnea🇮🇹 · Ezio Maina🇮🇹 · Giovanni Pelliccioli🇮🇹 · Chiara Signorile-Signorile🇮🇹 · Paolo Torrielli🇮🇹 · Sandro Uccirati🇮🇹

    We present a new method for the local subtraction of infrared divergences at next-to-next-to-leading order (NNLO) in QCD, for generic infrared-safe observables. Our method attempts to conjugate the minimal local counterterm structure arising from a sector partition of the radiation phase space with the simplifications following from analytic integration of the counterterms. In this first implementation, the method applies to final-state massless particles. We show how our method compactly organises infrared subtraction at NLO, we deduce in detail the general structure of the subtraction terms at NNLO, and we provide a proof of principle with a complete application to a simple process at NNLO.

    hep-phJHEP(2018)·150 citations
21. 21*

    Semileptonic decays of $B^{(\ast )}$, $D^{(\ast )}$ into $\nu l$ and pseudoscalar or vector mesons

    L. R. Dai🇨🇳 · X. Zhang🇨🇳 · E. Oset🇪🇸

    We perform a study of the $B^{(\ast )}$, $D^{(\ast )}$ semileptonic decays, using a different method than in conventional approaches, where the matrix elements of the weak operators are evaluated and a detailed spin-angular momentum algebra is performed to obtain very simple expressions at the end for the different decay modes. Using only one experimental decay rate in the $B$ or $D$ sectors, the rates for the rest of decay modes are predicted and they are in good agreement with experiment. Some discrepancies are observed in the $\tau$ decay mode for which we find an explanation. We perform evaluations for $B^{\ast }$ and $D^{\ast }$ decay rates that can be used in future measurements, now possible in the LHCb collaboration.

    hep-phPRD(2018)·17 citations
22. 22*

    ZZ and Zgamma still haven't found what they are looking for

    Brando Bellazzini🇫🇷 · Francesco Riva🇨🇭

    Neutral diboson processes are precise probes of the Standard Model (SM) of particle physics, which entail high sensitivity to new physics effects. We identify in terms of dimension-8 effective operators the leading departures from the SM that survive in neutral diboson processes at high-energy, and which interfere with the unsuppressed SM helicity contributions. We describe symmetries and selections rules that single out those operators, both for weakly and strongly coupled physics beyond the SM. Finally, we show that unitarity and causality enforce, via dispersion relations, positivity constraints on the coefficients of these effective operators, reducing the parameter space which is theoretically allowed.

    hep-phPRD(2018)·89 citations
23. 23*

    Bound-state dark matter with Majorana neutrinos

    M. Reig🇪🇸 · D. Restrepo🇨🇴 · J. W. F. Valle🇪🇸 · O. Zapata🇨🇴

    We propose a simple scenario in which dark matter (DM) emerges as a stable neutral hadronic thermal relics, its stability following from an exact $U(1{)}_D$ symmetry. Neutrinos pick up radiatively induced Majorana masses from the exchange of colored DM constituents. There is a common origin for both dark matter and neutrino mass, with a lower bound for neutrinoless double beta decay. Direct DM searches at nuclear recoil experiments will test the proposal, which may also lead to other phenomenological signals at future hadron collider and lepton flavour violation experiments.

    hep-phPLB(2019)·32 citations
24. 24*

    Evidence of a structure in ${\bar{K}}^0{\Lambda }_c^{+}$ consistent with a charged ${\Xi }_c(2930{)}^{+}$, and updated measurement of ${\bar{B}}^0\to {\bar{K}}^0{\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ at Belle

    Belle Collaboration: Y. B. Li🇨🇳 · C. P. Shen🇨🇳 · I. Adachi🇯🇵 · H. Aihara🇯🇵 · S. Al Said🇸🇦 · D. M. Asner🇺🇸 · T. Aushev🇷🇺 · R. Ayad🇸🇦 · V. Babu🇮🇳 · I. Badhrees🇸🇦 · S. Bahinipati🇮🇳 · Y. Ban🇨🇳 and 165 other authors

    We report evidence for the charged charmed-strange baryon ${\Xi }_c(2930{)}^{+}$ with a signal significance of 3.9$\sigma$ with systematic errors included. The charged ${\Xi }_c(2930{)}^{+}$ is found in its decay to $K_S^0{\Lambda }_c^{+}$ in the substructure of ${\bar{B}}^0\to K_S^0{\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ decays. The measured mass and width are $[2942.3\pm 4.4(stat.)\pm 1.5(syst.)]$~MeV/$c^2$ and $[14.8\pm 8.8(stat.)\pm 2.5(syst.)]$~MeV, respectively, and the product branching fraction is $\mathcal{B}({\bar{\mathcal{B}}}^0\to {\Xi }_c(2930{)}^{+}{\bar{\Lambda }}_c^{-})\mathcal{B}({\Xi }_c(2930{)}^{+}\to {\bar{\mathcal{K}}}^0{\Lambda }_c^{+})=[2.37\pm 0.51(stat.)\pm 0.31(syst.)]\times 10^{-4}$. We also measure $\mathcal{B}({\bar{\mathcal{B}}}^0\to {\bar{\mathcal{K}}}^0{\Lambda }_c^{+}{\bar{\Lambda }}_c^{-})=[3.99\pm 0.76(stat.)\pm 0.51(syst.)]\times 10^{-4}$ with greater precision than previous experiments, and present the results of a search for the charmonium-like state $Y(4660)$ and its spin partner, $Y_{\eta }$, in the ${\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ invariant mass spectrum. No clear signals of the $Y(4660)$ or $Y_{\eta }$ are observed and the 90\% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of $(772\pm 11)\times 10^{6}B\bar{B}$ pairs collected at the ${\rm Y}(4S)$ resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.

    ↳ hep-exhep-phEPJC(2018)·43 citations
25. 25*

    Deuteron and Antideuteron Production Simulation in Cosmic-ray Interactions

    Diego-Mauricio Gomez-Coral🇲🇽 · Arturo Menchaca Rocha🇲🇽 · Varlen Grabski🇲🇽 · Amaresh Datta🇺🇸 · Philip von Doetinchem🇺🇸 · Anirvan Shukla🇺🇸

    The study of the cosmic-ray deuteron and antideuteron flux receives an increasing interest in current astrophysics investigations. For both cases an important contribution is expected from the nuclear interactions of primary cosmic rays with intergalactic matter. In this work, deuteron and antideuteron production from 20 to 2.6$\times$10${}^7$ GeV beam energy in p+p and p+A collisions were simulated using EPOS-LHC and Geant4's FTFP-BERT Monte Carlo models by adding an event-by-event coalescence model afterburner. These estimates depend on a single parameter ($p_0$) obtained from a fit to the data. The $p_0$ for deuterons in this wide energy range was evaluated for the first time. It was found that $p_0$ for antideuterons is not a constant at all energies as previous works suggested and as a consequence the antideuteron production cross section can be at least 20 times smaller in the low collision energy region, than earlier estimations.

    ↳ astro-ph.HEhep-phnucl-thPRD(2018)·38 citations
26. 26*

    Heavy Quarkonia in a Potential Model: Binding Energy, Decay Width, and Survival Probability

    P. K. Srivastava🇮🇳 · O. S. K. Chaturvedi🇮🇳 · Lata Thakur🇮🇳

    Recently a lot of progress has been made in deriving the heavy quark potential within a QCD medium. In this article we have considered heavy quarkonium in a hot quark gluon plasma phase. The heavy-quark potential has been modeled properly for short as well as long distances. The potential at long distances is modeled as a QCD string which is screened at the same scale as the Coloumb field. We have numerically solved the 1+1-dimensional Schrodinger equation for this potential and obtained the eigen wavefunction and binding energy for the $1S$ and $2S$ states of charmonium and bottomonium. Further, we have calculated the decay width and dissociation temperature of quarkonium states in the QCD plasma. Finally, we have used our recently proposed unified model with these new values of decay widths to calculate the survival probability of the various quarkonium states with respect to centrality at relativistic heavy ion collider (RHIC) and large hadron collider (LHC) energies. This study provides a unified, consistent and comprehensive description of spectroscopic properties of various quarkonium states at finite temperatures along with their nuclear modification factor at different collision energies.

    ↳ nucl-thhep-phEPJC(2018)·17 citations
27. 27*

    Formation of Relativistic Axion Stars

    James Y. Widdicombe🇬🇧 · Thomas Helfer🇬🇧 · David J. E. Marsh🇩🇪 · Eugene A. Lim🇬🇧

    Axions and axion-like particles are compelling candidates for the missing dark matter of the universe. As they undergo gravitational collapse, they can form compact objects such as axion stars or even black holes. In this paper, we study the formation and distribution of such objects. First, we simulate the formation of compact axion stars using numerical relativity with aspherical initial conditions that could represent the final stages of axion dark matter structure formation. We show that the final states of such collapse closely follow the known relationship of initial mass and axion decay constant $f_a$. Second, we demonstrate with a toy model how this information can be used to scan a model density field to predict the number densities and masses of such compact objects. In addition to being detectable by the LIGO/VIRGO gravitational wave interferometer network for axion mass of $10^{-9}<m_a<10^{-11}$ eV, we show using peak statistics that for $f_a<0.2M_{pl}$, there exists a "mass gap" between the masses of axion stars and black holes formed from collapse.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2018)·60 citations
28. 28*

    Gravitational Rainbows: LIGO and Dark Energy at its Cutoff

    Claudia de Rham🇬🇧 · Scott Melville🇬🇧

    The recent direct detection of a neutron star merger with optical counterpart has been used to severely constrain models of dark energy that typically predict a modification of the speed of gravitational waves. We point out that the energy scales observed at LIGO, and the particular frequency of the neutron star event, lie very close to the strong coupling scale or cutoff associated with many dark energy models. While it is true that at very low energies one expects gravitational waves to travel at a speed different than light in these models, the same is no longer necessarily true as one reaches energy scales close to the cutoff. We show explicitly how this occurs in a simple model with a known partial UV completion. Within the context of Horndeski, we show how the operators that naturally lie at the cutoff scale can affect the speed of propagation of gravitational waves and bring it back to unity at those scales. We discuss how further missions including LISA and PTAs could play an essential role in testing such models.

    ↳ hep-thastro-ph.COgr-qchep-phPRL(2018)·283 citations
29. 29*

    Multi-body correlations in SU(3) Fermi gases

    Hiroyuki Tajima🇯🇵 · Pascal Naidon🇯🇵

    We investigate strong-coupling effects in a three-component atomic Fermi gas. It is a promising candidate for simulating quantum chromodynamics (QCD), and furthermore, the emergence of various phenomena such as color superfluidity and Efimov effect are anticipated in this system. In this paper, we study the effects of two-body and three-body correlations by means of the many-body $T$-matrix approximation (TMA) as well as the Skorniakov-Ter-Martirosian (STM) equation with medium corrections. We investigate the effects of finite temperature and chemical potential on the trimer binding energy at the superfluid critical point of the unitarity limit.

    ↳ cond-mat.quant-gashep-phnucl-thJ.Low Temp.Phys.(2019)·3 citations
30. 30*

    Effect of the GUP on the Entropy, Speed of Sound, and Bulk to Shear Viscosity Ratio of an ideal QGP

    Nasser Demir🇰🇼 · Elias C. Vagenas🇰🇼

    In this work we compute the entropy density, speed of sound, and the resulting impact on the bulk viscosity to shear viscosity ratio of an ideal Quark Gluon Plasma when the effects of a generalized uncertainty principle are taken into consideration. When the parameter of the generalized uncertainty principle tends to zero, i.e., $\alpha \to 0$, we obtain the value of the speed of sound for the ideal gas of massless particles, i.e., $c_s^2\to 1/3$, and we recover the expected result that the bulk viscosity $\zeta \to 0$ when $\alpha \to 0$. In addition, in the high temperature limit, i.e., $T\to \infty$, the speed of sound satisfies the equation $c_s^2\to 1/4$. The consequence this has on the bulk viscosity is that in the high temperature limit, the ratio of the bulk to shear viscosity $\zeta /\eta \to 5/48$. Our results suggest that the GUP introduces a scale into the system breaking the a priori conformal invariance of a system of massless noninteracting particles.

    ↳ hep-thhep-phNPB(2018)·16 citations
31. 31*

    A Vertex Operator Algebra Construction of the Colour-Kinematics Dual numerator

    Chih-Hao Fu🇨🇳 · Pierre Vanhove🇫🇷 · Yihong Wang🇹🇼

    We derive a vertex operator based expression for the kinematic numerators of Yang-Mills amplitudes by applying the momentum kernel formalism to open string amplitudes. The expression involves an ${\alpha }^{\prime }$-weighted commutator induced by the monodromy relations between the colour ordered Yang-Mills amplitudes, which mirrors the ${\alpha }^{\prime }$ deformed colour structure observed in open string and semi-abelian $Z$-theory. The kinematic algebra given by this construction contains the Lie algebra of diffeomorphism as an obvious sub-algebra.

    ↳ hep-thhep-phJHEP(2018)·30 citations
32. 32*

    Candidate Phases for SU(2) Adjoint QCD${}_4$ with Two Flavors from $\mathcal{N}=2$ Supersymmetric Yang-Mills Theory

    Clay Cordova🇺🇸 · Thomas T. Dumitrescu🇺🇸

    We study four-dimensional adjoint QCD with gauge group SU(2) and two Weyl fermion flavors, which has an $SU(2{)}_R$ chiral symmetry. The infrared behavior of this theory is not firmly established. We explore candidate infrared phases by embedding adjoint QCD into $\mathcal{N}=2$ supersymmetric Yang-Mills theory deformed by a supersymmetry-breaking scalar mass M that preserves all global symmetries and 't Hooft anomalies. This includes 't Hooft anomalies that are only visible when the theory is placed on manifolds that do not admit a spin structure. The consistency of this procedure is guaranteed by a nonabelian spin-charge relation involving the $SU(2{)}_R$ symmetry that is familiar from topologically twisted $\mathcal{N}=2$ theories. Since every vacuum on the Coulomb branch of the $\mathcal{N}=2$ theory necessarily matches all 't Hooft anomalies, we can generate candidate phases for adjoint QCD by deforming the theories in these vacua while preserving all symmetries and 't Hooft anomalies. One such deformation is the supersymmetry-breaking scalar mass M itself, which can be reliably analyzed when M is small. In this regime it gives rise to an exotic Coulomb phase without chiral symmetry breaking. By contrast, the theory near the monopole and dyon points can be deformed to realize a candidate phase with monopole-induced confinement and chiral symmetry breaking. The low-energy theory consists of two copies of a ${\mathbb{CP}}^1$ sigma model, which we analyze in detail. Certain topological couplings that are likely to be present in this ${\mathbb{CP}}^1$ model turn the confining solitonic string of the model into a topological insulator. We also examine the behavior of various candidate phases under fermion mass deformations. We speculate on the possible large-M behavior of the deformed $\mathcal{N}=2$ theory and conjecture that the ${\mathbb{CP}}^1$ phase eventually becomes dominant.

    ↳ hep-thcond-mat.str-elhep-phSciPost Phys.(2024)·130 citations
33. 33*

    Clockwork Axions in Cosmology: Is Chromonatural Inflation Chrononatural?

    Prateek Agrawal🇺🇸 · JiJi Fan🇺🇸 · Matthew Reece🇺🇸

    Many cosmological models rely on large couplings of axions to gauge fields. Examples include theories of magnetogenesis, inflation on a steep potential, chiral gravitational waves, and chromonatural inflation. Such theories require a mismatch between the axion field range and the mass scale appearing in the $aF\tilde{F}$ coupling. This mismatch suggests an underlying monodromy, with the axion winding around its fundamental period a large number of times. We investigate the extent to which this integer can be explained as a product of smaller integers in a UV completion: in the parlance of our times, can the theory be "clockworked"? We argue that a clockwork construction producing a potential ${\mu }^4\cos (\frac{a}{j{F}_a})$ for an axion of fundamental period $F_a$ will obey the constraint $\mu <F_a$. For some applications, including chromonatural inflation with sub-Planckian field range, this constraint obstructs a clockwork UV completion. Alternative routes to a large coupling include fields of large charge (an approach limited by strong coupling) or kinetic mixing (requiring a lighter axion). Our results suggest that completions of axion cosmologies that explain the large parameter in the theory potentially alter the phenomenological predictions of the model.

    ↳ hep-thastro-ph.COhep-phJHEP(2018)·77 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.