Tue·Jan 8, 2019Tuesday·January 8, 2019

1. 01*

   A Private SUSY 4HDM with FCNC in the Up-sector

   M. A. Arroyo-Urena (1)🇲🇽 · J. Lorenzo Diaz-Cruz (2 and 3)🇲🇽 · Bryan O. Larios-Lopez (2 and 4)🇲🇽 · M. A. Perez-de Leon (3) ( (1) Facultad de Estudios Superiores Cuautitlan -UNAM, (2) Mesoamerican Center for Theoretical Physics, UNACH, (3) CIFFU and Facultad de Ciencias Físico - Matemáticas, BUAP, (4) Departamento de Gravitación y Altas Energías, Facultad de Ciencias, Universidad Nacional Autónoma de Honduras )🇲🇽

   We present a SUSY model with four Higgs doublets of the ``private type", where each fermion type (up, down, and charged leptons) obtain their masses from a different Higgs doublet H_f ( f = u_1, d, e). The conditions for anomaly cancellation, imply that the remaining Higgs doublet of the model (H_{u_2}), must have the same hypercharge as H_{u_1}, and thus can only couple to up-type quarks, which opens the possibility to have FCNC's only in this sector. We study the Lagrangian of the model, and in particular the Higgs potential, in order to identify the Higgs mass-eigenstates and their interactions; for the Yukawa matrices we consider the 4-texture case. We obtain constraints on the model parameters by using LHC measurements on the properties of the 125 GeV Higgs boson ($h$), and identify viable regions of parameter space. These constraints are then used to evaluate the prospects to detect the FCNC decay mode t -> ch at the future high-luminosity (HL) option for the LHC, which are compared with current limits from LHC-run2. Then, we also evaluate the FCNC decay of the next heavier Higgs boson H_2 -> tc, which can reach typically BR(H_2 -> tc) = O(10^{-4}-10^{-5} ); the search for the signal at HL-LHC is also studied, finding that it could be detectable for some specific regions of the model parameter space.

   hep-phCPC(2021)·22 citations
2. 02*

   General mathematical analysis on multiple solutions of interfering resonances combinations

   Yu Bai🇨🇳 · Dian-Yong Chen🇨🇳

   When fitting cross sections with several resonances or interfering background and resonances, one usually obtains multiple solutions of parameters with equal fitting quality. In the present work, we find the source of multiple solutions for a combination of several resonances or interfering background and resonances by analyzing the mathematical structure of the Breit-Wigner function. We find that there are $2^n$ fitting solutions with equal quality for $n+1$ resonances, and the multiplicity of the interfering background and resonances depends on zeros of the amplitudes in the complex plane. We provide a simple, general method to infer all other solutions with equal fitting quality from a known solution.

   hep-phPRD(2019)·22 citations
3. 03*

   The width difference in the $B_s$-${\bar{B}}_s$ system: towards NNLO

   Ulrich Nierste🇩🇪

   The width difference $\Delta \Gamma$ among the two mass eigenstates of the $B_s$-${\bar{B}}_s$ system is measured with a precision of 7%. The theory prediction has a larger uncertainty which mainly stems from unknown perturbative higher-order QCD corrections. I discuss the subset of next-to-next-to-leading order diagrams proportional to ${\alpha }_s^2{N}_f$, where $N_f=5$ is the number of quark flavours. The results are published in [1].

   hep-ph1 citation
4. 04*

   Radiative corrections to the jet quenching parameter in dilute and dense media

   Jean-Paul Blaizot🇫🇷 · Fabio Dominguez🇪🇸

   We extend the calculation of radiative corrections to momentum broadening in a QCD medium to include processes where single scattering dominates over multiple soft scatterings. Our analysis focusses on processes that are enhanced by a potentially large double logarithmic contribution. We demonstrate that such double logarithmic contributions emerge in calculations of momentum broadening in dilute systems where only single scattering occurs. We show how the different regimes, multiple versus single scattering, constrain different parts of the phase space.

   hep-phnucl-thPRD(2019)·17 citations
5. 05*

   Catching p via s wave with indirect detection

   Steven J. Clark🇺🇸 · James B. Dent🇺🇸 · Bhaskar Dutta🇺🇸 · Louis E. Strigari🇺🇸

   For many dark matter models, the annihilation cross section to two-body final states is difficult to probe with current experiments because the dominant annihilation channel is velocity or helicity suppressed. The inclusion of gauge boson radiation for three-body final states can lift the helicity suppression, allowing a velocity-independent cross section to dominate the annihilation process, and providing an avenue to constrain these models. Here we examine experimental constraints on dark matter that annihilates to two leptons plus a bremsstrahlung boson, $\bar{\ell }+\ell +\gamma /W/Z$. We consider experimental constraints on photon final states from Fermi-LAT using both diffuse photon data and data from dwarf spheroidal galaxies, and compare to the implied constraints from 21 cm measurements. Diffuse photon line searches are generally the strongest over the entire mass regime. We in particular highlight the model in which dark matter annihilates to two neutrinos and a photon, and show that these models are more strongly constrained through photon measurements than through existing neutrino bounds.

   hep-phastro-ph.COastro-ph.HEPRD(2019)·4 citations
6. 06*

   Chiral Kinetic Theory from Effective Field Theory Revisited

   Shu Lin🇨🇳 · Aradhya Shukla🇨🇳

   We revisit the chiral kinetic equation from high density effective theory approach, finding a chiral kinetic equation differs from counterpart derived from field theory in high order terms in the $O(1/\mu )$ expansion, but in agreement with the equation derived in on-shell effective field theory upon identification of cutoff. By using reparametrization transformation properties of the effective theory, we show that the difference in kinetic equations from two approaches are in fact expected. It is simply due to different choices of degree of freedom by effective theory and field theory. We also show that they give equivalent description of the dynamics of chiral fermions.

   hep-phcond-mat.mes-hallnucl-thJHEP(2019)·45 citations
7. 07*

   Note on the Witten index and the dynamical breaking of a supersymmetric gauge theory

   Renata Jora🇷🇴

   It is known that in order for a supersymmetric gauge theory to be dynamically broken a necessary but not sufficient condition is that the Witten index $(-1{)}^F=n_b^0-n_f^0$ is zero. In the case the Witten index is zero it is in general hard to distinguish between theories with or without dynamical supersymmetry breaking. In this work we show that for a large class of theories the cancellation of the Witten index by itself signals the formation of a quark condensate and therefore produces dynamical supersymmetry breaking.

   hep-ph1 citation
8. 08*

   Possible triple-charm molecular pentaquarks from ${\Xi }_{cc}{D}_1/{\Xi }_{cc}{D}_2^{\ast }$ interactions

   Fu-Lai Wang🇨🇳 · Rui Chen🇨🇳 · Zhan-Wei Liu🇨🇳 · Xiang Liu🇨🇳

   In this work, we explore a systematic investigation on $S$-wave interactions between a doubly charmed baryon ${\Xi }_{cc}(3621)$ and a charmed meson in a $T$ doublet $(D_1,D_2^{\ast })$. We first analyze the possibility for forming ${\Xi }_{cc}{D}_1/{\Xi }_{cc}{D}_2^{\ast }$ bound states with the heavy quark spin symmetry. Then, we further perform a dynamical study on the ${\Xi }_{cc}{D}_1/{\Xi }_{cc}{D}_2^{\ast }$ interactions within a one-boson-exchange model by considering both the $S$-$D$ wave mixing and coupled channel effect. Finally, our numerical results conform the proposals from the heavy quark spin symmetry analysis: the ${\Xi }_{cc}{D}_1$ systems with $I(J^P)=$ $0(1/2^{+},3/2^{+})$ and the ${\Xi }_{cc}{D}_2^{\ast }$ systems with $I(J^P)=$ $0(3/2^{+},5/2^{+})$ can possibly be loose triple-charm molecular pentaquarks. Meanwhile, we also extend our model to the ${\Xi }_{cc}{\bar{D}}_1$ and ${\Xi }_{cc}{\bar{D}}_2^{\ast }$ systems, and our results indicate the isoscalars of ${\Xi }_{cc}{\bar{D}}_1$ and ${\Xi }_{cc}{\bar{D}}_2^{\ast }$ can be possible molecular candidates.

   hep-phPRD(2019)·42 citations
9. 09*

   The dispersion relation of the fast neutrino oscillation wave

   Changhao Yi🇺🇸 · Lei Ma🇺🇸 · Joshua D. Martin🇺🇸 · Huaiyu Duan (UNM)🇺🇸

   A dense neutrino medium can support flavor oscillation waves which are coherent among different momentum modes of the neutrinos. The dispersion relation (DR) branches of such a wave with complex frequencies and/or wave numbers can lead to the exponential growth of the wave amplitude which in turn will engender a collective flavor transformation in the neutrino medium. In this work we propose that the complex DR branches of the neutrino oscillation wave should be bound by the critical points of the DR. We demonstrate how this theory can be applied to the neutrino medium with an (approximate) axial symmetry about the propagation direction of the neutrino oscillation wave. We also show how the flavor instabilities in this medium can be identified by tracing the critical points of the DR as the electron lepton number distribution of the neutrino medium is changed continuously.

   hep-phastro-ph.HEnucl-thPRD(2019)·86 citations
10. 10*

    Recent developments in particle yield fluctuation measurements

    Igor Altsybeev🇷🇺

    In relativistic heavy-ion collisions, properties of the initial state and effects arising during evolution of the medium, such as a transition between the hadronic and partonic phases, should reflect themselves in event-by-event fluctuations of the number of produced particles. In this paper, recent measurements of several event-by-event observables, namely, dynamical fluctuations of relative particle yields and forward-backward correlations of different types, are discussed. Also, new observables for forward-backward correlation studies are proposed: correlations between ratios of identified particle yields in two separated acceptance intervals and the correlation between the ratio in one interval and average transverse momentum in another.

    hep-phnucl-exEPJ Web Conf.(2019)·0 citations
11. 11*

    Broad composite resonances and their signals at the LHC

    Da Liu🇺🇸 · Lian-Tao Wang🇺🇸 · Ke-Pan Xie🇰🇷

    We explore the possibility that the left-handed third generation quark doublet $q_L$ is fully composite in composite Higgs models. The signature of the model is the presence of broad spin-1 resonances strongly interacting with the third generation quark doublet $q_L$. In this case, The $t\bar{t}$ resonance search channel is comparable in sensitivity to the di-lepton channel. In addition, the same-sign di-lepton channel in the $t\bar{t}\rho$ associate production can probe the large $g_{\rho }$ parameter space and complementary to the Drell-Yan production channels.

    hep-phPRD(2019)·20 citations
12. 12*

    Phenomenological study for the search of evidence for intrinsic charm at the COMPASS experiment

    Andrei Gridin🇷🇺 · Stefan Groote🇪🇪 · Alexey Guskov🇷🇺 · Sergey Koshkarev🇪🇪

    In this paper we conduct a phenomenological study for the search of evidence for the intrinsic charm mechanism in double $J/\psi$ production at the COMPASS experiment using the CERN ${\pi }^{-}$ beam at 190 GeV/c. We also re-review the double $J/\psi$ production data provided by the NA3 experiment using the CERN ${\pi }^{-}$ beam at 150 and 280 GeV/c with incident on a platinum target.

    hep-phPhys.Part.Nucl.Lett.(2020)·4 citations
13. 13*

    QCD sum rule studies on the $ss\bar{s}\bar{s}$ tetraquark states with $J^{PC}=1^{+-}$

    Er-Liang Cui🇨🇳 · Hui-Min Yang🇨🇳 · Hua-Xing Chen🇨🇳 · Wei Chen🇨🇳 · Cheng-Ping Shen🇨🇳

    We apply the method of QCD sum rules to study the structure $X$ newly observed by the BESIII Collaboration in the $\varphi {\eta }^{\prime }$ mass spectrum in 2.0-2.1 GeV region in the $J/\psi \to \varphi \eta {\eta }^{\prime }$ decay. We construct all the $ss\bar{s}\bar{s}$ tetraquark currents with $J^{PC}=1^{+-}$, and use them to perform QCD sum rule analyses. One current leads to reliable QCD sum rule results and the mass is extracted to be $2.00_{-0.09}^{+0.10}$ GeV, suggesting that the structure $X$ can be interpreted as an $ss\bar{s}\bar{s}$ tetraquark state with $J^{PC}=1^{+-}$. The $Y(2175)$ can be interpreted as its $ss\bar{s}\bar{s}$ partner having $J^{PC}=1^{--}$, and we propose to search for the other two partners, the $ss\bar{s}\bar{s}$ tetraquark states with $J^{PC}=1^{++}$ and $1^{-+}$, in the ${\eta }^{\prime }{f}_0(980)$, ${\eta }^{\prime }K\bar{K}$, and ${\eta }^{\prime }K{\bar{K}}^{\ast }$ mass spectra.

    hep-phhep-exhep-latEPJC(2019)·26 citations
14. 14*

    Impact of Yukawa-like dimension-5 operators on the Georgi-Machacek model

    Avik Banerjee🇮🇳 · Gautam Bhattacharyya🇮🇳 · Nilanjana Kumar🇮🇳

    We study the effects of including Yukawa-like dimension-5 operators in the Georgi-Machacek model where the Standard Model is augmented with triplet scalars. We focus only on the charged Higgs sector and investigate the constraints arising from radiative B-meson decays, neutral B-meson mixing and precision measurement of Zbb vertex. We observe that the inclusion of the dimension-5 operators causes substantial alteration of the limits on the charged Higgs masses and the vacuum expectation value of the triplets, derived otherwise using only the dimension-4 operators.

    hep-phhep-exPRD(2019)·17 citations
15. 15*

    Sum rules for $CP$ asymmetries of charmed baryon decays in the $SU(3{)}_F$ limit

    Di Wang🇨🇳

    Motivated by the recent LHCb observation of $CP$ violation in charm, we study $CP$ violation in the charmed baryon decays. A simple method to search for the $CP$ violation relations in the flavor $SU(3)$ limit, which is associated with a complete interchange of $d$ and $s$ quarks, is proposed. With this method, hundreds of $CP$ violation sum rules in the doubly and singly charmed baryon decays can be found. As examples, the $CP$ violation sum rules in two-body charmed baryon decays are presented. Some of the $CP$ violation sum rules could help the experiment to find better observables. As byproducts, the branching fraction of ${\Xi }_c^{+}\to p{K}^{-}{\pi }^{+}$ is predicted to be $(1.7\pm 0.5)\%$ in the $U$-spin limit and the fragmentation-fraction ratio is determined as $f_{{\Xi }_b}/f_{{\Lambda }_b}=0.065\pm 0.020$ using the LHCb data.

    hep-phEPJC(2019)·48 citations
16. 16*

    Multiparticle azimuthal angular correlations in $pA$ collisions

    Cheng Zhang🇨🇳 · Manyika Kabuswa Davy🇨🇳 · Yu Shi🇨🇳 · Enke Wang🇨🇳

    In the Color Glass Condensate formalism, we evaluate the 3-dipole correlator up to the $\frac{1}{N_c^4}$ order with $N_c$ being the number of colors, and compute the azimuthal cumulant $c_{123}$ for 3-particle productions. In addition, we discuss the patterns appearing in the $n$-dipole formula in terms of $\frac{1}{N_c}$ expansions. This allows us to conjecture the $N_c$ scaling of $c_n\{m\}$, which is crosschecked by our calculation of $c_2\{4\}$ in the dilute limit.

    hep-phhep-thPRD(2019)·4 citations
17. 17*

    Diagnosing the Reactor Antineutrino Anomaly with Global Antineutrino Flux Data

    C. Giunti🇮🇹 · Y. F. Li🇨🇳 · B. R. Littlejohn🇺🇸 · P. T. Surukuchi🇺🇸

    We have examined the impact of new Daya Bay, Double Chooz, and RENO measurements on global fits of reactor antineutrino flux data to a variety of hypotheses regarding the origin of the reactor antineutrino anomaly. In comparing RENO and Daya Bay measurements of inverse beta decay (IBD) yield versus ${}^{239}$Pu fission fraction, we find differing levels of precision in measurements of time-integrated yield and yield slope, but similar central values, leading to modestly enhanced isotopic IBD yield measurements in a joint fit of the two datasets. In the absence of sterile neutrino oscillations, global fits to all measurements now provide 3{\sigma} preference for incorrect modeling of specific fission isotopes over common mis-modeling of all beta-converted isotopes. If sterile neutrino oscillations are considered, global IBD yield fits provide no substantial preference between oscillation-including and oscillation-excluding hypotheses: hybrid models containing both sterile neutrino oscillations and incorrect ${}^{235}$U or ${}^{239}$Pu flux predictions are favored at only 1-2{\sigma} with respect to models where ${}^{235}$U, ${}^{238}$U, and ${}^{239}$Pu are assumed to be incorrectly predicted.

    hep-phPRD(2019)·42 citations
18. 18*

    Analytic approach to calculations of mass spectra and decay constants of heavy-light quarkonia in the framework of Bethe-Salpeter equation

    Eshete Gebrehana🇪🇹 · Shashank Bhatnagar🇮🇳 · Hluf Negash🇪🇹

    This work is an extension of the work in \cite{bhatnagar18} to ground and excited states of $0^{++},0^{-+}$, and $1^{--}$ of heavy-light ($c\overline{u},c\overline{s},b\overline{u},b\overline{s}$, and $b\overline{c}$) quarkonia in the framework of a QCD motivated Bethe-Salpeter equation (BSE) by making use of the exact treatment of the spin structure $({\gamma }_{\mu }⨂{\gamma }_{\mu })$ in the interaction kernel, in contrast to the approximate treatment of the same in our previous works \cite{hluf16, bhatnagar18}), which is a substantial improvement over our previous works \cite{hluf16,bhatnagar18}. In this $4\times 4$ BSE framework, the coupled Salpeter equations for $Q\overline{q}$ (that are more involved than the equal mass ($Q\overline{Q}$) mesons) 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 their mass spectral equations. The analytic forms of wave functions obtained from these equations are then used for calculation of leptonic decay constants of ground and excited states of $0^{-+}$, and $1^{--}$ as a test of these wave functions and the over all framework.

    hep-phPRD(2019)·31 citations
19. 19*

    Strange hadrocharmonium

    M.B. Voloshin🇺🇸

    It has been recently suggested that the charged charmoniumlike resonances $Z_c(4100)$ and $Z_c(4200)$ are two states of hadrocharmonium, related by the charm quark spin symmetry in the same way as the lowest charmonium states ${\eta }_c$ and $J/\psi$. It is pointed out here that in this picture one might expect existence of their somewhat heavier strange counterparts, $Z_{cs}$, decaying to ${\eta }_{c}K$ and $J/\psi K$. Some expected properties of such charmoniumlike strange resonances are discussed that set benchmarks for their search in the decays of the strange $B_s$ mesons.

    hep-phhep-exPLB(2019)·32 citations
20. 20*

    Cosmology With a Very Light $L_{\mu }-L_{\tau }$ Gauge Boson

    Miguel Escudero🇬🇧 · Dan Hooper🇺🇸 · Gordan Krnjaic🇺🇸 · Mathias Pierre🇫🇷

    In this paper, we explore in detail the cosmological implications of an abelian $L_{\mu }-L_{\tau }$ gauge extension of the Standard Model featuring a light and weakly coupled $Z^{\prime }$. Such a scenario is motivated by the longstanding $\sim 4\sigma$ discrepancy between the measured and predicted values of the muon's anomalous magnetic moment, $(g-2{)}_{\mu }$, as well as the tension between late and early time determinations of the Hubble constant. If sufficiently light, the $Z^{\prime }$ population will decay to neutrinos, increasing the overall energy density of radiation and altering the expansion history of the early universe. We identify two distinct regions of parameter space in this model in which the Hubble tension can be significantly relaxed. The first of these is the previously identified region in which a $\sim 10-20$ MeV $Z^{\prime }$ reaches equilibrium in the early universe and then decays, heating the neutrino population and delaying the process of neutrino decoupling. For a coupling of $g_{\mu -\tau }\simeq (3-8)\times 10^{-4}$, such a particle can also explain the observed $(g-2{)}_{\mu }$ anomaly. In the second region, the $Z^{\prime }$ is very light ($m_{Z^{\prime }}\sim 1\text{eV}$ to $\text{MeV}$) and very weakly coupled ($g_{\mu -\tau }\sim 10^{-13}$ to $10^{-9}$). In this case, the $Z^{\prime }$ population is produced through freeze-in, and decays to neutrinos after neutrino decoupling. Across large regions of parameter space, we predict a contribution to the energy density of radiation that can appreciably relax the reported Hubble tension, $\Delta N_{\mathrm{eff}}\simeq 0.2$.

    hep-phastro-ph.COJHEP(2019)·268 citations
21. 21*

    Dark Matter in Very Supersymmetric Dark Sectors

    Avital Dery🇮🇱 · Jeff A. Dror🇺🇸 · Laurel Stephenson Haskins🇮🇱 · Yonit Hochberg🇮🇱 · Eric Kuflik🇮🇱

    If supersymmetry exists at any scale, regardless of whether it is restored around the weak scale, it may be a good symmetry of the dark sector, enforcing a degeneracy between its lowest lying fermions and bosons. We explore the implications of this scenario for the early universe and dark matter, as well as the corresponding signatures. In particular we show that the thermal history of the dark sector results in co-decaying dark matter in much of the parameter space. This implies new phenomenological signatures and presents a new way to discover high scale supersymmetry.

    hep-phastro-ph.COPRD(2019)·13 citations
22. 22*

    Solving the strong CP problem with non-conventional CP

    A. L. Cherchiglia🇧🇷 · C. C. Nishi🇧🇷

    A very simple model is presented where all CP violation in Nature is spontaneous in origin. The CKM phase is generated unsuppressed and the strong CP problem is solved with only moderately small couplings between the SM and the CP violation sector or mediator sector because corrections to $\bar{\theta }$ arise only at two loops. The latter feature follows from an underlying unconventional CP symmetry of order 4 imposed in the sectors beyond the SM composed of only two vector-like quarks of charge $-1/3$ and one complex scalar singlet. No additional symmetry is necessary to implement the Nelson-Barr mechanism.

    hep-phJHEP(2019)·16 citations
23. 23*

    The NMSSM is within Reach of the LHC: Mass Correlations & Decay Signatures

    Sebastian Baum🇸🇪 · Nausheen R. Shah🇺🇸 · Katherine Freese🇸🇪

    The Next-to-Minimal Supersymmetric Standard Model (NMSSM), the singlet extension of the MSSM which fixes many of the MSSM's shortcomings, is shown to be within reach of the upcoming runs of the Large Hadron Collider (LHC). A systematic treatment of the various Higgs decay channels and their interplay has been lacking due to the seemingly large number of free parameters in the NMSSM's Higgs sector. We demonstrate that due to the SM-like nature of the observed Higgs boson, the NMSSM's Higgs and neutralino sectors have highly correlated masses and couplings and can effectively be described by four physically intuitive parameters: the physical masses of the two CP-odd states and their mixing angle, and $\tan \beta$, which plays a minor role. The heavy Higgs bosons in the NMSSM have large branching ratios into pairs of lighter Higgs bosons or a light Higgs and a $Z$ boson. Search channels arising via these Higgs cascades are unique to models like the NMSSM with a Higgs sector larger than that of the MSSM. In order to cover as much of the NMSSM parameter space as possible, one must combine conventional search strategies employing decays of the additional Higgs bosons into pairs of SM particles with Higgs cascade channels. We demonstrate that such a combination would allow a significant fraction of the viable NMSSM parameter space containing additional Higgs bosons with masses below 1 TeV to be probed at future runs of the LHC.

    hep-phhep-exJHEP(2019)·38 citations
24. 24*

    Two natural scenarios for dark matter particles coexisting with supersymmetry

    Maxwell Throm🇺🇸 · Reagan Thornberry🇺🇸 · John Killough🇺🇸 · Brian Sun🇺🇸 · Gentill Abdulla🇺🇸 · Roland E. Allen🇺🇸

    We describe two natural scenarios in which both dark matter WIMPs (weakly interacting massive particles) and a variety of supersymmetric partners should be discovered in the foreseeable future. In the first scenario, the WIMPs are neutralinos, but they are only one component of the dark matter, which is dominantly composed of other relic particles such as axions. (This is the multicomponent model of Baer, Barger, Sengupta, and Tata.) In the second scenario, the WIMPs result from an extended Higgs sector and may be the only dark matter component. In either scenario, both the dark matter WIMP and a plethora of other neutral and charged particles await discovery at many experimental facilities. The new particles in the second scenario have far weaker cross-sections for direct and indirect detection via their gauge interactions, which are either momentum-dependent or second-order. However, as we point out here, they should have much stronger interactions via the Higgs. We estimate that their interactions with fermions will then be comparable to (although not equal to) those of neutralinos with a corresponding Higgs interaction. It follows that these newly proposed dark matter particles should be within reach of emerging and proposed facilities for direct, indirect, and collider-based detection.

    hep-phMod.Phys.Lett.A(2019)·9 citations
25. 25*

    Shrinking the Quark Gluon Plasma

    Matthew D. Sievert🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸

    In recent years the understanding on the limits of the smallest possible droplet of the Quark Gluon Plasma has been called into question. Experimental results from both the Large Hadron Collider and the Relativistic Heavy Ion Collider have provided hints that the Quark Gluon Plasma may be produced in systems as small as that formed in pPb or dAu collisions. Yet alternative explanations still exist from correlations arising from quarks and gluons in a color glass condensate picture. In order to resolve these two scenarios, a system size scan has been proposed at the Large Hadron Collider for collisions of ArAr and OO. Here we make predictions for a possible future run of ArAr and OO collisions at the Large Hadron Collider and study the system size dependence of a variety of flow observables. We find that linear response (from the initial conditions to the final flow harmonics) becomes more dominant in smaller systems whereas linear+cubic response can accurately predict multi-particle cumulants for a wide range of centralities in large systems.

    ↳ nucl-thhep-phnucl-exPRC(2019)·90 citations
26. 26*

    Stochastic Modeling of 3-D Compositional Distribution in the Crust with Bayesian Inference and Application to Geoneutrino Observation in Japan

    Nozomu Takeuchi🇯🇵 · Kenta Ueki🇯🇵 · Tsuyoshi Iizuka🇯🇵 · Jun Nagao🇯🇵 · Akiko Tanaka🇯🇵 · Sanshiro Enomoto🇯🇵 · Yutaka Shirahata🇯🇵 · Hiroko Watanabe🇯🇵 · Makoto Yamano🇯🇵 · Hiroyuki K.M. Tanaka🇯🇵

    Geoneutrino observations, first achieved by KamLAND in 2005 and followed by Borexino in 2010, have accumulated statistics and improved sensitivity for more than ten years. The uncertainty of the geoneutrino flux at the surface is now reduced to a level small enough to set useful constraints on U and Th abundances in the bulk silicate earth (BSE). However, in order to make inferences on earth's compositional model, the contributions from the local crust need to be understood within a similar uncertainty. Here we develop a new method to construct a stochastic crustal composition model utilizing Bayesian inference. While the methodology has general applicability, it incorporates all the local uniqueness in its probabilistic framework. Unlike common approaches for this type of problem, our method does not depend on crustal segmentation into upper, (middle) and lower, whose classification and boundaries are not always well defined. We also develop a new modeling method to infer rock composition distributions that conserve mass balance and therefore do not bias the results. Combined with a new vast collection of geochemical data for rock samples in the Japan arc, we apply this method to geoneutrino observation at Kamioka, Japan. Currently a difficulty remains in the handling of correlations in the flux integration; we conservatively assume maximum correlation, which leads to large flux estimation errors of 60~70%. Despite the large errors, this is the first local crustal model for geoneutrino flux prediction with probabilistic error estimation in a reproducible way.

    ↳ physics.geo-phhep-phPhys.Earth Planet.Interiors(2019)·10 citations
27. 27*

    From Lagrangian to Hamiltonian formulations of the Palatini action

    SangChul Yoon🇰🇷

    We work on the Lagrangian and the Hamiltonian formulations of the Palatini action. In the Lagrangian formulation, we find that we need to assume the metric compatibility and the torsion zero or to assume the tetrad compatibility to describe General Relativity. In the Hamiltonian formulation, we obtain the Einstein's equations only with assuming the tetrad compatibility. The Hamiltonian from assuming the metric compatibility and the torsion zero should be used to quantize General Relativity.

    ↳ gr-qchep-phhep-th3 citations
28. 28*

    Methods of determining the absolute branching fractions of ${\Lambda }_c^{+}$ baryons and $D_s^{+}$ mesons at hadron colliders

    Sheldon Stone🇺🇸

    Current absolute branching fractions of ${\Lambda }_c^{+}$ and $D_s^{+}$ mesons are limiting the determination of important measurements. They have only been measured at $e^{+}{e}^{-}$ colliders. Here techniques for measuring them at hadron colliders are discussed. The precision determination of ${\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+}$ seems possible with current data, however the corresponding determination of $D_s^{+}\to K^{+}{K}^{-}{\pi }^{+}$ will require more integrated luminosity.

    ↳ hep-exhep-ph2 citations
29. 29*

    Open Heavy Flavors in Nuclear Collisions: Theory Overview

    Pol Bernard Gossiaux🇫🇷

    I review the current status and some prospects of theoretical studies on open heavy flavor physics in nuclear collisions at RHIC and LHC energies.

    ↳ nucl-thhep-phnucl-exNPA(2019)·7 citations
30. 30*

    The QCD Kondo phase in quark stars

    R. Fariello🇧🇷 · Juan C. Macías🇧🇷 · F. S. Navarra🇧🇷

    We study light (u, d) quark matter with charm impurities. These impurities are added to the Lagrangian density. We derive the equation of state (EOS) of this kind of quark matter, which contains a Kondo phase. We explore this EOS and study the structure of stars, identifying the effects of the Kondo phase. Solving the TOV equations and computing the mass-radius diagram, we find that the presence of a Kondo phase leads to smaller and lighter stars.

    ↳ nucl-thhep-lathep-ph15 citations
31. 31*

    Transversity and $\Lambda$ polarization at COMPASS

    Andrea Moretti (on behalf of the COMPASS Collaboration)🇮🇹

    The study of $\Lambda$ polarization in Semi-Inclusive Deep Inelastic Scattering (SIDIS) with a transversely polarized target has often been suggested as a privileged way to access transversity, as the initial quark polarization can be transmitted to the hyperon and then observed via its weak decay. COMPASS measured the $\Lambda$ transversity-induced polarization as a function of Bjorken $x$, of the fraction $z$ of the longitudinal momentum of the fragmenting quark carried by the $\Lambda$ and of the $\Lambda$ transverse momentum $P_T$. The results are compatible with zero in all regions of phase space. Under the hypothesis that transversity is a valence object, the previous knowledge of the transversity function allows to get information on the ratio of polarized and unpolarized $z-$integrated $\Lambda$ fragmentation functions. On the other hand, if the $\Lambda$ polarization is entirely due to the $s$ quark, or if a quark-diquark model is applied, information can be obtained on the $s$ quark transversity function.

    ↳ hep-exhep-phPoS(2018)·7 citations
32. 32*

    Measurement of azimuthal asymmetries in SIDIS on unpolarized protons

    Andrea Moretti (on behalf of the COMPASS Collaboration)🇮🇹

    The COMPASS Collaboration is measuring the asymmetries in the azimuthal distributions of positive and negative hadrons produced in Deep Inelastic Scattering (DIS) on unpolarized protons. The data have been collected in 2016 and 2017 with a 160 GeV/$c$ muon beam scattering off a liquid hydrogen target. The amplitudes of three modulations, $A_{UU}^{\cos {\varphi }_h}$, $A_{UU}^{\cos 2{\varphi }_h}$ and $A_{LU}^{\sin {\varphi }_h}$ are measured as function of the Bjorken variable $x$, of the fraction of virtual photon energy carried by the hadron $z$, and of the hadron transverse momentum with respect to the virtual photon $p_T^h$. The relevance of azimuthal asymmetries lies in the possibility to get information on the intrinsic transverse momentum of the quark as well as on the still unknown Boer-Mulders parton distribution function. The preliminary results from 2016 data shown here confirm the strong kinematic dependencies observed in previous measurements conducted by COMPASS, HERMES and CLAS.

    ↳ hep-exhep-phPoS(2019)·6 citations
33. 33*

    Minimal Higgs inflation with an $R^2$ term in Palatini gravity

    Tommi Tenkanen🇺🇸

    It has recently been suggested that the Standard Model Higgs boson could act as the inflaton while minimally coupled to gravity - given that the gravity sector is extended with an $\alpha R^2$ term and the underlying theory of gravity is of Palatini, rather than metric, type. In this paper, we revisit the idea and correct some shortcomings in earlier studies. We find that in this setup the Higgs can indeed act as the inflaton and that the tree-level predictions of the model for the spectral index and the tensor-to-scalar ratio are $n_s\simeq 0.941$, $r\simeq 0.3/(1+10^{-8}\alpha )$, respectively, for a typical number of e-folds, $N=50$, between horizon exit of the pivot scale $k=0.05{\mathrm{Mpc}}^{-1}$ and the end of inflation. Even though the tensor-to-scalar ratio is suppressed compared to the usual minimally coupled case and can be made compatible with data for large enough $\alpha$, the result for $n_s$ is in severe tension with the Planck results. We briefly discuss extensions of the model.

    ↳ astro-ph.COgr-qchep-phPRD(2019)·87 citations
34. 34*

    Phenomenological view on baryon-baryon potentials from lattice QCD simulations

    J. Haidenbauer🇩🇪 · U.-G. Meißner🇩🇪

    A qualitative discussion on the range of the potentials as they result from the phenomenological meson-exchange picture and from lattice simulations by the HAL QCD Collaboration is presented. For the former pion- and/or $\eta$-meson exchange are considered together with the scalar-isoscalar component of correlated $\pi \pi /K\bar{K}$ exchange. It is observed that the intuitive expectation for the behavior of the baryon-baryon potentials for large separations, associated with the exchange of one and/or two pions, does not always match with the potentials extracted from the lattice simulations. Only in cases where pion exchange provides the longest ranged contribution, like in the $\Xi N$ system, a reasonable qualitative agreement between the phenomenological and the lattice QCD potentials is found for baryon-baryon separations of $r\gtrsim 1$ fm. For the $\Omega N$ and $\Omega \Omega$ interactions where isospin conservation rules out one-pion exchange a large mismatch is observed, with the potentials by the HAL QCD Collaboration being much longer ranged and much stronger at large distances as compared to the phenomenological expectation. This casts some doubts on the applicability of using these potentials in few- or many-body systems.

    ↳ nucl-thhep-lathep-phEPJA(2019)·12 citations
35. 35*

    dS Vacua and the Swampland

    Renata Kallosh🇺🇸 · Andrei Linde🇺🇸 · Evan McDonough🇺🇸 · Marco Scalisi🇧🇪

    In this note we revisit some of the recent 10d and 4d arguments suggesting that uplifting of supersymmetric AdS vacua leads to flattening of the potential, preventing formation of dS vacua. We explain why the corresponding 10d approach is inconclusive and requires considerable modifications. We also show that while the flattening effects may occur for some extreme values of the parameters, they do not prevent the formation of dS vacua within the range of validity of the 4d KKLT models. The KL version of the KKLT scenario based on a racetrack superpotential requires parametrically small uplifting, which is not affected by flattening. We show that this scenario is compatible with the weak gravity conjecture for a broad choice of parameters of the KL model. Thus, the results of our analysis do not support the recent swampland conjecture.

    ↳ hep-thgr-qchep-phJHEP(2019)·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.