Tue·Apr 11, 2017Tuesday·April 11, 2017

1. 01*

   The leptonic future of the Higgs

   Gauthier Durieux🇩🇪 · Christophe Grojean🇩🇪 · Jiayin Gu🇨🇳 · Kechen Wang🇨🇳

   Precision study of electroweak symmetry breaking strongly motivates the construction of a lepton collider with center-of-mass energy of at least 240 GeV. Besides Higgsstrahlung ($e^{+}{e}^{-}\to hZ$), such a collider would measure weak boson pair production ($e^{+}{e}^{-}\to WW$) with an astonishing precision. The weak-boson-fusion production process ($e^{+}{e}^{-}\to \nu \bar{\nu }h$) provides an increasingly powerful handle at higher center-of-mass energies. High energies also benefit the associated top-Higgs production ($e^{+}{e}^{-}\to t\bar{t}h$) that is crucial to constrain directly the top Yukawa coupling. The impact and complementarity of differential measurements, at different center-of-mass energies and for several beam polarization configurations, are studied in a global effective-field-theory framework. We define a "global determinant parameter" (GDP) which characterizes the overall strengthening of constraints independently of the choice of operator basis. The reach of the CEPC, CLIC, FCC-ee, and ILC designs is assessed.

   hep-phhep-exJHEP(2017)·109 citations
2. 02*

   A Cosmic Selection Rule for Glueball Dark Matter Relic Density

   Amarjit Soni🇺🇸 · Huangyu Xiao🇨🇳 · Yue Zhang🇺🇸

   We point out a unique mechanism to produce the relic abundance for glueball dark matter from a gauged $SU(N{)}_d$ hidden sector which is bridged to the standard model sector through heavy vectorlike quarks colored under gauge interactions from both sides. A necessary ingredient of our assumption is that the vectorlike quarks, produced either thermally or non-thermally, are abundant enough to dominate the universe for some time in the early universe. They later undergo dark color confinement and form unstable vectorlike-quarkonium states which annihilate decay and reheat the visible and dark sectors. The ratio of entropy dumped into two sectors and the final energy budget in the dark glueballs is only determined by low energy parameters, including the intrinsic scale of the dark $SU(N{)}_d$, ${\Lambda }_d$, and number of dark colors, $N_d$, but depend weakly on parameters in the ultraviolet such as the vectorlike quark mass or the initial condition. We call this a cosmic selection rule for the glueball dark matter relic density.

   hep-phastro-ph.COPRD(2017)·44 citations
3. 03*

   Neutrino Mass Sum Rules and Symmetries of the Mass Matrix

   Julia Gehrlein🇩🇪 · Martin Spinrath🇩🇪

   Neutrino mass sum rules have recently gained again more attention as a powerful tool to discriminate and test various flavour models in the near future. A related question which was not yet discussed fully satisfactorily was the origin of these sum rules and if they are related to any residual or accidental symmetry. We will address this open issue here systematically and find previous statements confirmed. Namely, that the sum rules are not related to any enhanced symmetry of the Lagrangian after family symmetry breaking but that they are simply the result of a reduction of free parameters due to skillful model building.

   hep-phEPJC(2017)·15 citations
4. 04*

   Prompt photon yield and elliptic flow from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions

   Alejandro Ayala🇲🇽 · Jorge David Castano-Yepes🇲🇽 · C. A. Dominguez🇿🇦 · L. A. Hernandez🇲🇽 · Saul Hernandez-Ortiz🇲🇽 · Maria Elena Tejeda-Yeomans🇲🇽

   We compute photon production at early times in semi-central relativistic heavy-ion collisions from non-equilibrium gluon fusion induced by a magnetic field. The calculation accounts for the main features of the collision at these early times, namely, the intense magnetic field and the high gluon occupation number. The gluon fusion channel is made possible by the magnetic field and would otherwise be forbidden due to charge conjugation invariance. Thus, the photon yield from this process is an excess over calculations without magnetic field effects. We compare this excess to the difference between PHENIX data and recent hydrodynamic calculations for the photon transverse momentum distribution and elliptic flow coefficient $v_2$. We show that with reasonable values for the saturation scale and magnetic field strength, the calculation helps to better describe the experimental results obtained at RHIC energies for the lowest part of the transverse photon momentum.

   hep-phPRD(2017)·46 citations
5. 05*

   Gravitational Waves, baryon asymmetry of the universe and electric dipole moment in the CP-violating NMSSM

   Ligong Bian🇨🇳 · Huai-Ke Guo🇨🇳 · Jing Shu🇨🇳

   In this work, we make the first study of electroweak baryogenesis (EWBG) based on the LHC data in the CP-violating next-to-minimal supersymmetric model (NMSSM) where a strongly first order electroweak phase transition (EWPT) is obtained in the general complex Higgs potential. With representative benchmark points which pass the current LEP and LHC constraints, we demonstrate the structure of EWPT for those points and how a strongly first order EWPT is obtained in the complex NMSSM where the resulting gravitational wave production properties are found to be within the reaches of future space-based interferometers like BBO and Ultimate-DECIGO. We further calculate the generated baryon asymmetries where the CP violating sources are (1): higgsino-singlino dominated, (2): higgsino-gaugino dominated or (3): from both sources. It is shown that all three representing scenarios could evade the strong constraints set by various electric dipole moments (EDM) searches where cancellations among the EDM contributions occur at the tree level (higgsino-singlino dominated) or loop level (higgsino-gaugino dominated). The 125 GeV SM like Higgs can be either the second lightest neutral Higgs $H_2$ or the third lightest neutral Higgs $H_3$. Finally, we comment on the future direct and indirect probe of CPV in the Higgs sector from the collider and EDM experiments.

   hep-phCPC(2018)·69 citations
6. 06*

   The protophobic $X$-boson coupled to quantum electrodynamics

   Mario J. Neves · Everton M. C. Abreu

   The possible origin of an $X$-boson having a mass value around $17\text{mbox}MeV$ had motivated us to investigate its interaction with leptons of QED. This new hypothetical particle can possibly be a candidate to describe the so called fifth interaction, in a new physics scenario beyond the Standard Model. The model of the $X$-boson interacting with QED is based on a $U(1)\times U^{\prime }(1)$ symmetry, where the group $U^{\prime }(1)$ is attached to the $X$-boson, with a kinetic mixing with the photon. The Higgs sector was revisited to generate the mass for the new boson. Thus, the mass of $17\text{mbox}MeV$ fixes a vacuum expected value scale. Thereby, we could estimate the mass of the hidden Higgs field through both the VEV-scale and the Higgs' couplings. A model of QFT was constructed in a renormalizable gauge, and we analyzed its perturbative structure. After that, the radiative correction of the $X$-boson propagator has been calculated at one loop approximation to yield the Yukawa potential correction. The form factors associated with the QED-vertex correction were calculated to confirm electron's anomalous magnetic moment together with the computation of the interaction magnitude. The muon case was discussed. Furthermore, we have introduced a renormalization group scheme to explore the current $X$-boson mass and its coupling constant with the leptons of the Standard Model.

   hep-phActa Phys.Polon.B(2020)·8 citations
7. 07*

   Wilsonian Dark Matter in String Derived $Z^{\prime }$ Model

   L. Delle Rose🇬🇧 · A.E. Faraggi🇬🇧 · C. Marzo🇪🇪 · J. Rizos🇬🇷

   The dark matter issue is among the most perplexing in contemporary physics. The problem is more enigmatic due to the wide range of possible solutions, ranging from the ultra-light to the super-massive. String theory gives rise to plausible dark matter candidates due to the breaking of the non--Abelian Grand Unified Theory (GUT) symmetries by Wilson lines. The physical spectrum then contains states that do not satisfy the quantisation conditions of the unbroken GUT symmetry. Given that the Standard Model states are identified with broken GUT representations, and provided that any ensuing symmetry breaking is induced by components of GUT states, leaves a remnant discrete symmetry that forbid the decay of the Wilsonian states. A class of such states are obtained in a heterotic-string derived $Z^{\prime }$ model. The model exploits the spinor-vector duality symmetry, observed in the fermionic $Z_2\times Z_2$ heterotic-string orbifolds, to generate a $Z^{\prime }\in E_6$ symmetry that may remain unbroken down to low energies. The $E_6$ symmetry is broken at the string level with discrete Wilson lines. The Wilsonian dark matter candidates in the string derived model are $SO(10)$, and hence Standard Model, singlets and possess non-$E_6$ $U(1{)}_{Z^{\prime }}$ charges. Depending on the $U(1{)}_{Z^{\prime }}$ breaking scale and the reheating temperature they give rise to different scenarios for the relic abundance, and in accordance with the cosmological constraints.

   hep-phhep-thPRD(2017)·19 citations
8. 08*

   New ${\Omega }_c^0$ baryons discovered by LHCb as the members of $1P$ and $2S$ states

   Bing Chen🇨🇳 · Xiang Liu🇨🇳

   Inspired by the newly observed ${\Omega }_c^0$ states at LHCb, we decode their properties by performing an analysis of mass spectrum and decay behavior. Our studies show that the five narrow states, i.e., ${\Omega }_c(3000{)}^0$, ${\Omega }_c(3050{)}^0$, ${\Omega }_c(3066{)}^0$, ${\Omega }_c(3090{)}^0$, and ${\Omega }_c(3119{)}^0$, could be grouped into the $1P$ states with negative parity. Among them, the ${\Omega }_c(3000{)}^0$ and ${\Omega }_c(3090{)}^0$ states could be the $J^P=1/2^{-}$ candidates, while ${\Omega }_c(3050{)}^0$ and ${\Omega }_c(3119{)}^0$ are suggested as the $J^P=3/2^{-}$ states. ${\Omega }_c(3066{)}^0$ could be regarded as a $J^P=5/2^{-}$ state. Since the the spin-parity, the electromagnetic transitions, and the possible hadronic decay channels ${\Omega }_c^{(\ast )}\pi$ have not been measured yet, other explanations are also probable for these narrow ${\Omega }_c^0$ states. Additionally, we discuss the possibility of the broad structure ${\Omega }_c(3188{)}^0$ as a $2S$ state with $J^P=1/2^{+}$ or $J^P=3/2^{+}$. In our scheme, ${\Omega }_c(3119{)}^0$ cannot be a $2S$ candidate.

   hep-phhep-exPRD(2017)·97 citations
9. 09*

   Revisiting Vector-like Quark Model with Enhanced Top Yukawa Coupling

   Michio Hashimoto🇯🇵

   We revisit a scenario with an enhanced top yukawa coupling in vector-like quark (VLQ) models, where the top yukawa coupling is larger than the standard model value and the lightest VLQ has a negative yukawa coupling. We find that the parameter space satisfying the LHC bounds of the Higgs signal strengths consistently with the precision measurements is rather wide. Because the Lagrangian parameters of the yukawa couplings are large, such scenario can be realized in some strongly interacting theories. It also turns out that there is a noticeable relation between the contributions of the triangle and box diagrams in the $gg\to hh$ process by using the lowest order of the $1/M$ expansion where $M$ is the heavy mass running in the loops.

   hep-phhep-exPRD(2017)·9 citations
10. 10*

    Renormalization schemes for the Two-Higgs-Doublet Model and applications to h -> WW/ZZ -> 4fermions

    Lukas Altenkamp🇩🇪 · Stefan Dittmaier🇩🇪 · Heidi Rzehak🇩🇰

    We perform the renormalization of different types of Two-Higgs-Doublet Models for the calculation of observables at next-to-leading order. In detail, we suggest four different renormalization schemes based on on-shell renormalization conditions as far as possible and on MSbar prescriptions for the remaining field-mixing parameters where no distinguished on-shell condition exists and make contact to existing schemes in the literature. In particular, we treat the tadpole diagrams in different ways and discuss issues of gauge independence and perturbative stability in the considered schemes. The renormalization group equations for the MSbar parameters are solved in each scheme, so that a consistent renormalization scale variation can be performed. We have implemented all Feynman rules including counterterms and the renormalization conditions into a FeynArts model file, so that amplitudes and squared matrix elements can be generated automatically. As an application we compute the decay of the light, CP-even Higgs boson of the Two-Higgs-Doublet Model into four fermions at next-to-leading order. The comparison of different schemes and the investigation of the renormalization scale dependence allows us to test the perturbative consistency in each of the renormalization schemes, and to get a better estimate of the theoretical uncertainty that arises due to the truncation of the perturbation series.

    hep-phJHEP(2017)·89 citations
11. 11*

    Hadronic decay properties of newly observed ${\Omega }_c$ baryons

    Ze Zhao🇨🇳 · Dan-Dan Ye🇨🇳 · Ailin Zhang🇨🇳

    Hadronic decay widths of the newly observed charmed strange baryons, ${\Omega }_c(3000{)}^0$, ${\Omega }_c(3050{)}^0$, ${\Omega }_c(3066{)}^0$, ${\Omega }_c(3090{)}^0$ and ${\Omega }_c(3119{)}^0$ have been calculated in a ${}^3{P}_0$ model. Our results indicate that ${\Omega }_c(3066{)}^0$ and ${\Omega }_c(3090{)}^0$ can be interpreted as the $1P-$wave ${\Omega }_{c2}({\frac{3}{2}}^{-})$ or ${\Omega }_{c2}({\frac{5}{2}}^{-})$. Though the measured masses of ${\Omega }_c(3000{)}^0$, ${\Omega }_c(3050{)}^0$ and ${\Omega }_c(3119{)}^0$ are lower than existed theoretical predictions of $1D-$wave ${\Omega }_c$, the hadronic decay features of these ${\Omega }_c$ favor assignments of the $1D-$wave states. ${\Omega }_c(3000{)}^0$ is possibly ${\Omega }_{c1}({\frac{1}{2}}^{+})$ or ${\Omega }_{c1}({\frac{3}{2}}^{+})$, ${\Omega }_c(3050{)}^0$ is possibly ${\hat{\Omega }}_{c3}({\frac{5}{2}}^{+})$ or ${\hat{\Omega }}_{c3}({\frac{7}{2}}^{+})$, and ${\Omega }_c(3119{)}^0$ is possibly ${\hat{\Omega }}_{c3}({\frac{5}{2}}^{+})$, ${\hat{\Omega }}_{c3}({\frac{7}{2}}^{+})$, ${\Omega }_{c3}({\frac{5}{2}}^{+})$ or ${\Omega }_{c3}({\frac{7}{2}}^{+})$. The predicted total decay widths in these assignments are consistent with experiment.

    hep-phhep-exPRD(2017)·69 citations
12. 12*

    Initial condition for baryogenesis via neutrino oscillation

    Takehiko Asaka🇯🇵 · Shintaro Eijima🇨🇭 · Hiroyuki Ishida🇹🇼 · Kosuke Minogawa🇯🇵 · Tomoya Yoshii🇯🇵

    We consider a baryogenesis scenario via the oscillation of right-handed neutrinos with Majorana masses of the order of GeV, which are also responsible for neutrino masses by the seesaw mechanism. We study how the initial condition alters the prediction of the present baryon asymmetry by this mechanism. It is usually assumed that the abundance of right-handed neutrinos is zero after the reheating of the inflationary universe and they are produced in scattering processes by the renomalizable Yukawa interaction. However, the higher-dimensional operator with right-handed neutrinos may provide an additional production which is most effective at the reheating epoch. It is shown that such an initial abundance of right-handed neutrinos can significantly modify the prediction when the strong washout of the asymmetry is absent. This leads to the parameter space of the model for the successful baryogenesis being enlarged.

    hep-phastro-ph.HEPRD(2017)·36 citations
13. 13*

    Four-body baryonic decays of $B\to p\bar{p}{\pi }^{+}{\pi }^{-}({\pi }^{+}{K}^{-})$ and $\Lambda \bar{p}{\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$

    Y.K. Hsiao🇨🇳 · C.Q. Geng🇨🇳

    We study the four-body baryonic $B\to {\mathbf{B}}_1{\bar{\mathbf{B}}}_2{M}_1{M}_2$ decays with ${\mathbf{B}}_{1,2}$ ($M_{1,2}$) being charmless baryons (mesons). In accordance with the recent LHCb observations, each decay is considered to proceed through the $B\to M_1{M}_2$ transition together with the production of a baryon pair. We obtain that $\mathcal{B}(B^{-}\to \Lambda \bar{p}{\pi }^{+}{\pi }^{-})=(3.7_{-1.0}^{+1.5})\times 10^{-6}$ and $\mathcal{B}({\bar{B}}^0\to p\bar{p}{\pi }^{+}{\pi }^{-},p\bar{p}{\pi }^{+}{K}^{-})=(3.0\pm 0.9,6.6\pm 2.4)\times 10^{-6}$, in agreement with the data. We also predict $\mathcal{B}(B^{-}\to \Lambda \bar{p}{K}^{+}{K}^{-})=(3.0_{-0.9}^{+1.3})\times 10^{-6}$, which is accessible to the LHCb and BELLE experiments.

    hep-phhep-exPLB(2017)·19 citations
14. 14*

    Where is Particle Physics Going?

    John Ellis🇬🇧

    The answer to the question in the title is: in search of new physics beyond the Standard Model, for which there are many motivations, including the likely instability of the electroweak vacuum, dark matter, the origin of matter, the masses of neutrinos, the naturalness of the hierarchy of mass scales, cosmological inflation and the search for quantum gravity. So far, however, there are no clear indications about the theoretical solutions to these problems, nor the experimental strategies to resolve them. It makes sense now to prepare various projects for possible future accelerators, so as to be ready for decisions when the physics outlook becomes clearer. Paraphrasing George Harrison, "If you don't yet know where you're going, any road may take you there."

    hep-phhep-exInt.J.Mod.Phys.A(2017)·6 citations
15. 15*

    QCD determination of the leading order hadronic contribution to the muon g-2

    C. A. Dominguez🇿🇦 · K. Schilcher🇿🇦 · H. Spiesberger🇩🇪

    The leading order hadronic contribution to the muon magnetic moment anomaly, $a_{\mu }^{HAD}$, is determined entirely in the framework of QCD. The result in the light-quark sector, in units of $10^{-10}$, is $a_{\mu }^{HAD}{|}_{uds}=686\pm 26$, and in the heavy-quark sector $a_{\mu }^{HAD}{|}_c=14.4\pm 0.1$, and $a_{\mu }^{HAD}{|}_b=0.29\pm 0.01$, resulting in $a_{\mu }^{HAD}=701\pm 26$. The main uncertainty is due to the current lattice QCD value of the first and second derivative of the electromagnetic current correlator at the origin. Expected improvement in the precision of these derivatives may render this approach the most accurate and trustworthy determination of the leading order $a_{\mu }^{HAD}$.

    hep-phhep-exhep-latNuovo Cim.C(2018)·5 citations
16. 16*

    Production of doubly charmed baryons nearly at rest

    Stefan Groote🇪🇪 · Sergey Koshkarev🇪🇪

    We investigate the production cross sections, momentum distributions and rapidity distributions for doubly charmed baryons which according to the intrinsic heavy quark mechanism are produced nearly at rest. These events should be measurable at fixed-target experiments like STAR@RHIC and AFTER@LHC.

    hep-phnucl-thEPJC(2017)·20 citations
17. 17*

    Colored Particle Production in New Physics at NLO QCD and Its Matching to Parton Showers

    Hua-Sheng Shao🇫🇷

    In this talk, I show the automated Monte Carlo simulations at next-to-leading order in QCD as well as its matching to parton showers are already feasible within the framework of \MG5aMC. I briefly overview the recent activities and take the colored particle production at the LHC as examples. The tools and the models are ready for using by both phenomenologists and experimentalists.

    hep-phActa Phys.Polon.B(2017)·0 citations
18. 18*

    Recent breakthrough and outlook in constraining the non-Newtonian gravity and axion-like particles from Casimir physics

    G. L. Klimchitskaya🇷🇺

    The strongest constraints on the Yukawa-type corrections to Newton's gravitational law and on the coupling constants of axion-like particles to nucleons, following from recently performed experiments of the Casimir physics, are presented. Specifically, the constraints obtained from measurements of the lateral and normal Casimir forces between sinusoidally corrugated surfaces, and from the isoelectronic experiment are considered, and the ranges of their greatest strength are refined. Minor modifications in the experimental setups are proposed which allow strengthening the resultant constraints up to an order of magnitude. The comparison with some weaker constraints derived in the Casimir regime is also made.

    hep-phEPJC(2017)·20 citations
19. 19*

    The Role of Flavor in 2016

    Zoltan Ligeti🇺🇸

    This talk explores the role of flavor physics to constrain beyond standard model phenomena and future prospects, from a theoretical point of view. Possible implications of some experimental results in tension with the standard model are discussed, such as the 4 sigma deviation in the B -> D(*) tau nu decay rates. We use the examples of constraining new physics contributions to neutral meson mixing and the search for possible vector-like fermions to illustrate the expected progress over the next decade to increase the sensitivity to new physics at shorter distance scales. We also speculate about the ultimate limitations of (quark) flavor physics probes of new physics.

    hep-phPoS(2017)·1 citation
20. 20*

    Search for heavy neutral CP-even Higgs within Type-IV 2HDM at a future linear collider

    Majid Hashemi🇮🇷 · Gholamhossein Haghighat (Physics Department, College of Sciences, Shiraz University, Shiraz, Iran)🇮🇷

    In this paper, the production process $e^{-}{e}^{+}\to AH$ is analyzed in the context of the type IV 2HDM and the question of observability of a neutral CP-even Higgs boson $H$ at a linear collider operating at $\sqrt{s}=1$ TeV is addressed. The CP-odd Higgs is assumed to experience a gauge-Higgs decay as $A\to ZH$ with hadronic decay of $Z$ boson as the signature of signal events. The production chain is thus $e^{+}{e}^{-}\to AH\to ZHH\to jj\ell \ell \ell \ell$ where $\ell$ is a $\tau$ or $\mu$. Four benchmark points with different mass hypotheses are assumed for the analysis. The Higgs mass $m_H$ is assumed to vary within the range 150-300 GeV in increments of 50 GeV. The anti-$k_t$ algorithm is used to perform the jet reconstruction. Results indicate that the neutral CP-even Higgs $H$ is observable through this production mechanism using the di-muon invariant mass distribution with possibility of mass measurement. The corresponding signal significances exceed $5\sigma$ at integrated luminosity of 3000 $f{b}^{-1}$.

    hep-phPLB(2017)·10 citations
21. 21*

    Two Higgs bosons near 125 GeV in the NMSSM: beyond the narrow width approximation

    Biswaranjan Das🇮🇳 · Stefano Moretti🇬🇧 · Shoaib Munir🇰🇷 · Poulose Poulose🇮🇳

    In the next-to-minimal supersymmetric (NMS) Standard Model (SM), it is possible for either one of the additional singlet-like scalar and pseudoscalar Higgs bosons to be almost degenerate in mass with the ~125 GeV SM-like Higgs state. In the real NMSSM (rNMSSM), when the mass difference between two scalar states is comparable to their individual total decay widths, the quantum mechanical interference, due to the relevant diagonal as well as off-diagonal terms in the propagator matrix, between them can become sizable. This possibility invalidates usage of the narrow width approximation (NWA) to compute the cross section for the production of a di-photon pair with a given invariant mass via resonant Higgs boson(s) in the gluon fusion process at the Large Hadron Collider (LHC). When, motivated by the baryon asymmetry of the universe, CP-violating (CPV) phases are explicitly invoked in the Higgs sector of the NMSSM, all the interaction eigenstates mix to give five CP-indefinite physical Higgs bosons. In this scenario, the interference effects due the off-diagonal terms in the Higgs mass matrix that mix the pseudoscalar-like state with the SM-like one can also become significant, when these two are sufficiently mass-degenerate. We perform a detailed analysis, in both the real and complex NMSSM, of these interference effects, when the full propagator matrix is taken into account, in the production of a photon pair with an invariant mass near 125 GeV through gluon fusion. We find that these effects can account for up to ~40% of the total cross section for certain model parameter configurations. We also investigate how such mutually interfering states contributing to the ~125 GeV signal observed at the LHC can be distinguished from a single resonance.

    hep-phEPJC(2017)·20 citations
22. 22*

    Studies on Conformal and Superconformal Extensions of the Standard Model with an Application to Gravity

    Antonio Costantini🇮🇹

    In this thesis we study some theoretical and phenomenological aspects of classical conformal symmetry in specific extensions of the SM. We consider both supersymmetric and non supersymmetric cases. We discuss the perturbative structure of the superconformal anomaly effective action. We show that the manifestation of the anomaly is in the presence of massless intermediate states in correlators involving the Ferrara-Zumino supercurrent with two vector supercurrents. This universal feature is typical both of chiral and conformal anomalies. These results are used in a study of a possible extension of the SM with a dilaton, deriving some bounds on a possible conformal scale. Then we turn to investigate a specific superconformal theory, the TNMSSM, which extends the MSSM with one extra triplet and a scalar singlet superfield. The manifestation of the classical conformal symmetry in this model is in the existence of a very light pseudoscalar in the physical spectrum. We study the main proprieties of this state and its potential discovery at the LHC. In the last part of this work we discuss an application of the graviton-photon-photon vertex to gravitational lensing for a Schwarzschild background. In particular, we introduce the notion of a semiclassical lens equation for the deflection of a photon nearing the horizon of a black hole.

    hep-phhep-th0 citations
23. 23*

    Two Cosmic Coincidences for Minimal Standard Model with General Relativity

    Paul H. Frampton🇮🇹 · Holger B. Nielsen🇩🇰

    It is said that there are no accidents or coincidences in physics. Within the minimal standard model combined with general relativity we point out that there are three exceptionally-long lifetimes which are consistent with being equal, and hence that there are two unexplained coincidences.

    ↳ astro-ph.COgr-qchep-phhep-thInt.J.Mod.Phys.A(2019)·0 citations
24. 24*

    Bottomonia suppression in heavy-ion collisions

    Brandon Krouppa🇺🇸 · Radoslaw Ryblewski🇵🇱 · Michael Strickland🇺🇸

    The thermal suppression of heavy quark bound states represents an ideal observable for determining if one has produced a quark-gluon plasma in ultrarelativistic heavy-ion collisions. In recent years, a paradigm shift has taken place in the theory of quarkonium suppression due to new first principles calculations of the thermal widths of these states. These thermal widths are large, e.g. O(20-100 MeV) for the Upsilon(1S), and cause in-medium suppression of the states at temperatures below their traditionally defined disassociation temperatures. In order to apply the newly developed understanding to phenomenology, however, one must make detailed 3+1d dissipative hydrodynamical models of the plasma including the effects of finite shear viscosity. These effects include not only the modification of the time evolution of the temperature of the system, flow, etc., but also non-equilibrium modifications of the heavy quark potential itself. In this proceedings contribution, we briefly review the setup for these model calculations and present comparisons of theory with data from RHIC 200 GeV/nucleon Au-Au collisions, LHC 2.76 TeV/nucleon Pb-Pb, and LHC 5.02 TeV/nucleon Pb-Pb collisions as a function of number of participants, rapidity, and transverse momentum.

    ↳ nucl-thhep-phNPA(2017)·15 citations
25. 25*

    $ud\bar{b}\bar{b}$ tetraquark resonances with lattice QCD potentials and the Born-Oppenheimer approximation

    Pedro Bicudo🇵🇹 · Marco Cardoso🇵🇹 · Antje Peters🇩🇪 · Martin Pflaumer🇩🇪 · Marc Wagner🇩🇪

    We study tetraquark resonances with lattice QCD potentials computed for a static bbar bbar pair in the presence of two lighter quarks u d, the Born-Oppenheimer approximation and the emergent wave method. As a proof of concept we focus on the system with isospin I = 0, but consider different relative angular momenta l of the heavy quarks bbar bbar. For l=0 a bound state has already been predicted with quantum numbers I(JP) = 0(1+). Exploring various angular momenta we now compute the phase shifts and search for S and T matrix poles in the second Riemann sheet. We predict a tetraquark resonance for l =1, decaying into two B mesons, with quantum numbers I(JP) = 0(1-), mass m = 10 \, 576^{+4}_{-4} MeV} and decay width Gamma = 112^{+90}_{-103} MeV.

    ↳ hep-lathep-phPRD(2017)·91 citations
26. 26*

    Tests of Gravity Theories Using Supermassive Black Holes

    Jeremy Sakstein🇺🇸 · Bhuvnesh Jain🇺🇸 · Jeremy S. Heyl🇨🇦 · Lam Hui🇺🇸

    Scalar-tensor theories of gravity generally violate the strong equivalence principle, namely compact objects have a suppressed coupling to the scalar force, causing them to fall slower. A black hole is the extreme example where such a coupling vanishes, i.e. black hole has no scalar hair. Following earlier work, we explore observational scenarios for detecting strong equivalence principle violation, focusing on galileon gravity as an example. For galaxies in-falling towards galaxy clusters, the supermassive black hole can be offset from the galaxy center away from the direction of the cluster. Hence, well resolved images of galaxies around nearby clusters can be used to identify the displaced black hole via the star cluster bound to it. We show that this signal is accessible with imaging surveys, both ongoing ones such as the Dark Energy Survey, and future ground and space based surveys. Already, the observation of the central black hole in M~87 places new constraints on the galileon parameters, which we present here. $\mathcal{O}(1)$ matter couplings are disfavored for a large region of the parameter space. We also find a novel phenomenon whereby the black hole can escape the galaxy completely in less than one billion years.

    ↳ astro-ph.COastro-ph.GAgr-qchep-ph+1ApJL(2017)·38 citations
27. 27*

    A New Paradigm for Hadronic Parity Nonconservation and its Experimental Implications

    Susan Gardner🇺🇸 · W.C. Haxton🇺🇸 · Barry R. Holstein🇺🇸

    For decades the primary experimental goal in studies of hadronic parity nonconservation (PNC) has been the isolation of the isovector weak nucleon-nucleon interaction, expected to be dominated by long-range pion exchange and enhanced by the neutral current. In meson-exchange descriptions this interaction together with an isoscalar interaction generated by rho and omega exchange dominate most observables. Consequently these two amplitudes have been used to compare and check the consistency of the field's experiments. Yet to date, despite sensitive searches like that performed with 18F, no evidence for isovector hadronic PNC has been found. Here we argue, based on recent large-Nc treatments and new global analyses, that the emphasis on isovector hadronic PNC was misplaced. Large-Nc provides an alternative and theoretically better motivated simplification of effective field theories (EFTs) of hadronic PNC, separating the five low-energy constants (LECs) into two of leading order (LO), and three others that are NNLO. This scheme pivots the isospin coordinates we have traditionally used, placing one dominant axis in the isoscalar plane, and a second along the isotensor direction. We show that this large-Nc LEC hierarchy accurately describes all existing data on hadronic PNC, and we discuss opportunities to further test the predicted large-Nc hierarchy of LECs, illustrating the kind of analyses experimentalists can use to better constrain the LO theory and to determine the size of NNLO corrections.

    ↳ nucl-thhep-phAnn.Rev.Nucl.Part.Sci.(2017)·43 citations
28. 28*

    Scale-Invariant Hidden Local Symmetry, Topology Change and Dense Baryonic Matter II

    Won-Gi Paeng🇰🇷 · Thomas T. S. Kuo🇺🇸 · Hyun Kyu Lee🇰🇷 · Yong-Liang Ma🇨🇳 · Mannque Rho🇫🇷

    Exploiting certain robust topological inputs from the skyrmion description of compressed baryonic matter with a scale-chiral symmetric Lagrangian, we predict the equation of state that is consistent with the properties of nuclear matter at the equilibrium density, supports the maximum mass of massive compact star $\sim 2M_{\odot }$ and surprisingly gives the sound velocity close to the "conformal velocity" $1/\sqrt{3}$ at densities $\gtrsim 3n_0$. At the core of this result is the observation that parity-doubling occurs in the nucleon structure as density goes above $\sim 2n_0$ with a chiral-singlet mass $m_0\sim (0.6-0.9)m_N$, hinting at a possible up-to-date unsuspected source of proton mass and an emergence at high density of scale symmetry and flavor local symmetry, both hidden in the QCD vacuum.

    ↳ nucl-thastro-ph.HEhep-phPRD(2017)·73 citations
29. 29*

    Pseudorapidity profile of transverse momentum fluctuations in heavy ion collisions

    Sandeep Chatterjee🇵🇱 · Piotr Bozek🇵🇱

    We investigate pseudorapidity correlations of the average transverse flow of particles emitted in relativistic heavy-ion collisions. We employ 3+1 dimensional viscous relativistic hydrodynamics with initial conditions from the quark Glauber Monte Carlo model to confront the recent measurements on the pseudorapidity correlations of the transverse momentum fluctuations in Pb+Pb collisions at $\sqrt{s_{NN}}=2760$GeV. We find good agreement between the model predictions and data. Further, we study two other observables build with the covariance of the average transverse momentum in different rapidity bins. These observables have better stability under various systematics, thus allowing for a robust comparison between data and model. The transverse flow-transverse flow correlation coefficient is directly related to correlations of the underlying collective flow at different pseudorapidities. The 3-bin measure of $p_T$ factorization breaking in pseudorapidity gives an estimate of possible decorrelation of the average transverse flow in the longitudinal direction.

    ↳ nucl-thhep-phnucl-exPRC(2017)·20 citations
30. 30*

    Reply to "Comment on 'Lattice Gluon and Ghost Propagators, and the Strong Coupling in Pure SU(3) Yang-Mills Theory: Finite Lattice Spacing and Volume Effects' "

    Anthony G. Duarte🇵🇹 · Orlando Oliveira🇵🇹 · Paulo J. Silva🇵🇹

    The quenched gluon and ghost propagator data published in [1] is reanalysed following the suggestion of [2] to resolve the differences between the infrared data of the simulations. Our results confirms that the procedure works well either for the gluon or for the ghost propagator but not for both propagators simultaneously as the observed deviations in the data follow opposite patterns. Definitive conclusions require improving the determination of the (ratios) of lattice spacings. A simple procedure for the relative calibration of the lattice spacing in lattice simulations is suggested.

    ↳ hep-lathep-phPRD(2017)·18 citations
31. 31*

    Neutrinos from cosmic ray interactions in the Sun

    Joakim Edsjo🇸🇪 · Jessica Elevant🇸🇪 · Rikard Enberg🇸🇪 · Carl Niblaeus🇸🇪

    Cosmic rays hitting the solar atmosphere generate neutrinos that interact and oscillate in the Sun and oscillate on the way to Earth. These neutrinos could potentially be detected with neutrino telescopes and will be a background for searches for neutrinos from dark matter annihilation in the Sun. We calculate the flux of neutrinos from these cosmic ray interactions in the Sun and also investigate the interactions near a detector on Earth that give rise to muons. We compare this background with both regular Earth-atmospheric neutrinos and signals from dark matter annihilation in the Sun. Our calculation is performed with an event-based Monte Carlo approach that should be suitable as a simulation tool for experimental collaborations. Our program package is released publicly along with this paper.

    ↳ astro-ph.HEhep-phJCAP(2017)·90 citations
32. 32*

    Beam energy scan theory: Status and open questions

    H. Petersen🇩🇪

    The goal of heavy ion reactions at low beam energies is to explore the QCD phase diagram at high net baryon chemical potential. To relate experimental observations with a first order phase transition or a critical endpoint, dynamical approaches for the theoretical description have to be developed. In this summary of the corresponding plenary talk, the status of the dynamical modeling including the most recent advances is presented. The remaining challenges are highlighted and promising experimental measurements are pointed out.

    ↳ nucl-thhep-phnucl-exNPA(2017)·11 citations
33. 33*

    No static black hole hairs in gravitational theories of gravity with broken Lorentz invariance

    Kai Lin🇧🇷 · Shinji Mukohyama🇯🇵 · Anzhong Wang🇨🇳 · Tao Zhu🇨🇳

    In this paper, we revisit the issue of static hairs of black holes in gravitational theories with broken Lorentz invariance in the case that the speed $c_{\varphi }$ of the khronon field becomes infinitely large, $c_{\varphi }=\infty$, for which the sound horizon of the khronon field coincides with the universal horizon, and the boundary conditions at the sound horizon reduce to those given normally at the universal horizons. As a result, less boundary conditions are present in this extreme case in comparison with the case $c_{\varphi }=$ finite. Then, it would be expected that static hairs might exist. However, we show analytically that even in this case static hairs still cannot exist, based on a decoupling limit analysis. We also consider the cases in which $c_{\varphi }$ is finite but with $c_{\varphi }\gg 1$, and obtain the same conclusion.

    ↳ gr-qcastro-ph.COhep-phhep-thPRD(2017)·12 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.