Tue·Feb 13, 2018Tuesday·February 13, 2018

1. 01*

   Charting generalized supersoft supersymmetry

   Sabyasachi Chakraborty🇮🇳 · Adam Martin🇺🇸 · Tuhin S. Roy🇮🇳

   Without any shred of evidence for new physics from LHC, the last hiding spots of natural electroweak supersymmetry seem to lie either in compressed spectra or in spectra where scalars are suppressed with respect to the gauginos. While in the MSSM (or in any theory where supersymmetry is broken by the $F$-vev of a chiral spurion), a hierarchy between scalar and gaugino masses requires special constructions, it is automatic in scenarios where supersymmetry is broken by $D$-vev of a real spurion. In the latter framework, gaugino mediated contributions to scalar soft masses are finite (loop suppressed but not $\log$-enhanced), a feature often referred to as "supersoftness". Though phenomenologically attractive, pure supersoft models suffer from the $\mu$-problem, potential color-breaking minima, large $T$-parameter, etc. These problems can be overcome without sacrificing the model's virtues by departing from pure supersoftness and including $\mu$-type operators that use the same $D$-vev, a framework known as generalized supersoft supersymmetry. The main purpose of this paper is to point out that the new operators also solve the last remaining issue associated with supersoft spectra, namely that a right handed (RH) slepton is predicted to be the lightest superpartner, rendering the setup cosmologically unfeasible. In particular, we show that the $\mu$-operators in generalized supersoft generate a new source for scalar masses, which can raise the RH-slepton mass above bino due to corrections from renormalisation group evolutions (RGEs). In fact, a mild tuning can open up the bino--RH slepton coannihilation regime for a thermal dark matter. We derive the full set of RGEs required to determine the spectrum at low energies. Beginning with input conditions at a high scale, we show that completely viable spectra can be achieved.

   hep-phJHEP(2018)·12 citations
2. 02*

   The possible members of the $5^1{S}_0$ meson nonet

   Shi-Chen Xue🇨🇳 · Guan-Ying Wang🇨🇳 · Guan-Nan Li🇨🇳 · En Wang🇨🇳 · De-Min Li🇨🇳

   The strong decays of the $5^1{S}_0$ $q\bar{q}$ states are evaluated in the ${}^3{P}_0$ model with two types of space wave functions. Comparing the model expectations with the experimental data for the $\pi (2360)$, $\eta (2320)$, $X(2370)$, and $X(2500)$, we suggest that the $\pi (2360)$, $\eta (2320)$, and $X(2500)$ can be assigned as the members of the $5^1{S}_0$ meson nonet, while the $5^1{S}_0$ assignment for the $X(2370)$ is not favored by its width. The $5^1{S}_0$ kaon is predicted to have a mass of about 2418 MeV and a width of about 163 MeV or 225 MeV.

   hep-phEPJC(2018)·15 citations
3. 03*

   The possibility of leptonic CP-violation measurement with JUNO

   Mikhail Smirnov🇨🇳 · Zhuojun Hu🇨🇳 · Shuaijie Li🇨🇳 · Jiajie Ling🇨🇳

   The existence of CP-violation in the leptonic sector is one of the most important issues for modern science. Neutrino physics is a key to the solution of this problem. JUNO (under construction) is the near future of neutrino physics. However CP-violation is not a priority for the current scientific program. We estimate the capability of ${\delta }_{\mathrm{CP}}$ measurement, assuming a combination of the JUNO detector and a superconductive cyclotron as the antineutrino source. This method of measuring CP-violation is an alternative to conventional beam experiments. A significance level of 3$\sigma$ can be reached for 22% of the ${\delta }_{\mathrm{CP}}$ range. The accuracy of measurement lies between 8${}^{\mathrm{o}}$ and 22${}^{\mathrm{o}}$. It is shown that the dominant influence on the result is the uncertainty in the mixing angle ${\Theta }_{23}$.

   hep-phhep-exNPB(2018)·8 citations
4. 04*

   Searching for the light Higgsinos in MSSM at the future e-p colliders

   Chengcheng Han🇯🇵 · Ruibo Li🇨🇳 · Ren-Qi Pan🇨🇳 · Kai Wang🇨🇳

   The search of the light Higgsino {in the Minimal Supersymmetric Standard Model (MSSM)} is a crucial test for the criteria of the naturalness in supersymmetry. On the other hand, the direct production of light Higgsino is also known as one of the most challenging SUSY searches at the current CERN Large Hadron collider (LHC). The lack of visible leptons due to the compressed spectrum and their small production rates limits their discovery potential in both mono-jet plus MET as well as the weak boson fusion (WBF) production. The signal $S/B$ ratio prediction is usually within the background systematic uncertainties at the LHC. Without color exchange between the beams, the $e-p$ colliders are well-known to have the WBF feature. Therefore, we study the search of the light Higgsinos at two future $e-p$ colliders at CERN, LHeC and FCC-eh.~The light Higgsinos will be produced in pair through weak boson fusion with controlled background at these colliders. We find the Higgsino of 95/145~GeV can be reached at 2$\sigma$ level at the future LHeC/FCC-eh with a luminosity $3{\text{ab}}^{-1}$ respectively.

   hep-phPRD(2018)·16 citations
5. 05*

   Model-independent constraints on dark matter annihilation in dwarf spheroidal galaxies

   Kimberly K. Boddy🇺🇸 · Jason Kumar🇺🇸 · Danny Marfatia🇺🇸 · Pearl Sandick🇺🇸

   We present a general, model-independent formalism for determining bounds on the production of photons in dwarf spheroidal galaxies via dark matter annihilation, applicable to any set of assumptions about dark matter particle physics or astrophysics. As an illustration, we analyze gamma-ray data from the Fermi Large Area Telescope to constrain a variety of nonstandard dark matter models, several of which have not previously been studied in the context of dwarf galaxy searches.

   hep-phastro-ph.HEhep-exPRD(2018)·46 citations
6. 06*

   Topological pseudodefects of a supersymmetric $SO(10)$ model and cosmology

   Ila Garg🇮🇳 · Urjit A. Yajnik🇮🇳

   Obtaining realistic supersymmetry preserving vacua in the minimal renormalizable supersymmetric $Spin(10)$ GUT model introduces considerations of the non-trivial topology of the vacuum manifold. The $D$-parity of low energy unification schemes gets lifted to a one-parameter subgroup $U(1{)}_D$ of $Spin(10)$. Yet, the choice of the fields signaling spontaneous symmetry breaking leads to disconnected subsets in the vacuum manifold related by the $D$-parity. The resulting domain walls, existing due to topological reasons but not stable, are identified as topological pseudodefects. We obtain a class of one-parameter paths connecting $D$-parity flipped vacua and compute the energy barrier height along the same. We consider the various patterns of symmetry breaking which can result in either intermediate scale gauge groups or a supersymmetric extension of the Standard Model. If the onset of inflation is subsequent to GUT breaking, as could happen also if inflation is naturally explained by the same GUT, the existence of such pseudodefects can leave signatures in the CMB. Specifically, this could have an impact on the scale invariance of the CMB fluctuations and LSS data at the largest scale.

   hep-phhep-thPRD(2018)·7 citations
7. 07*

   Can effective muon g-2 depend on the gravitational potential?

   H. Nikolic🇭🇷

   Contrary to the claim in a series of recent papers, we show that it cannot. A source of the error in those papers is misinterpretation of coordinate time as a physical time.

   hep-phgr-qc11 citations
8. 08*

   The discreet charm of higgsino dark matter - a pocket review

   Kamila Kowalska🇵🇱 · Enrico Maria Sessolo🇵🇱

   We give a brief review of the current constraints and prospects for detection of higgsino dark matter in low-scale supersymmetry. In the first part we argue, after performing a survey of all potential dark matter particles in the MSSM, that the (nearly) pure higgsino is the only candidate emerging virtually unscathed from the wealth of observational data of recent years. In doing so by virtue of its gauge quantum numbers and electroweak symmetry breaking only, it maintains at the same time a relatively high degree of model-independence. In the second part we properly review the prospects for detection of a higgsino-like neutralino in direct underground dark matter searches, collider searches, and indirect astrophysical signals. We provide estimates for the typical scale of the superpartners and fine tuning in the context of traditional scenarios where the breaking of supersymmetry is mediated at about the scale of Grand Unification and where strong expectations for a timely detection of higgsinos in underground detectors are closely related to the measured 125 GeV mass of the Higgs boson at the LHC.

   hep-phastro-ph.HEhep-exAdv.High Energy Phys.(2018)·64 citations
9. 09*

   Study of temporal quantum correlations in decohering B and K meson systems

   Javid Naikoo🇮🇳 · Ashutosh Kumar Alok🇮🇳 · Subhashish Banerjee🇮🇳

   In this work we study temporal quantum correlations, quantified by Leggett-Garg (LG) and LG-type inequalities, in the $B$ and $K$ meson systems. We use the tools of open quantum systems to incorporate the effect of decoherence which is quantified by a single phenomenological parameter. The effect of $CP$ violation is also included in our analysis. We find that the LG inequality is violated for both $B$ and $K$ meson systems, the violation being most prominent in the case of $K$ mesons and least for $B_s$ system. Since the systems with no coherence do not violate LGI, incorporating \textit{decoherence} is expected to decrease the extent of violation of LGI and is clearly brought out in our results. We show that the expression for the LG functions depends upon an additional term, apart from the experimentally measurable meson transition probabilities. This term vanishes in the limit of zero decoherence. On the other hand, the LG-type parameter can be directly expressed in terms of transition probabilities, making it a more appropriate observable for studying temporal quantum correlations in neutral meson systems.

   hep-phquant-phPRD(2018)·38 citations
10. 10*

    Third Family Quark-Lepton Unification at the TeV Scale

    Admir Greljo🇩🇪 · Ben A. Stefanek🇩🇪

    We construct a model of quark-lepton unification at the TeV scale based on an $SU(4)$ gauge symmetry, while still having acceptable neutrino masses and enough suppression in flavor changing neutral currents. An approximate $U(2)$ flavor symmetry is an artifact of family-dependent gauge charges leading to a natural realization of the CKM mixing matrix. The model predicts sizeable violation of PMNS unitarity as well as a gauge vector leptoquark $U_1^{\mu }=(3,1,2/3)$ which can be produced at the LHC -- both effects within the reach of future measurements. In addition, recently reported experimental anomalies in semi-leptonic $B$-meson decays, both in charged $b\to c\tau \nu$ and neutral $b\to s\mu \mu$ currents, can be accommodated.

    hep-phhep-exPLB(2018)·193 citations
11. 11*

    Neutrino Predictions from Generalized CP Symmetries of Charged Leptons

    Peng Chen🇨🇳 · Salvador Centelles Chuliá🇪🇸 · Gui-Jun Ding🇨🇳 · Rahul Srivastava🇪🇸 · José W. F. Valle🇪🇸

    We study the implications of generalized CP transformations acting on the mass matrices of charged leptons in a model-independent way. Generalized $e-\mu$, $e-\tau$ and $\mu -\tau$ symmetries are considered in detail. In all cases the physical parameters of the lepton mixing matrix, three mixing angles and three CP phases can be expressed in terms of a restricted set of independent "theory" parameters that characterize a given choice of CP transformation. This leads to implications for neutrino oscillations as well as neutrinoless double beta decay experiments.

    hep-phhep-exnucl-exnucl-thJHEP(2018)·23 citations
12. 12*

    Discriminating WIMP-nucleus response functions in present and future XENON-like direct detection experiments

    A.Fieguth🇩🇪 · M.Hoferichter🇺🇸 · P.Klos🇩🇪 · J.Menéndez🇯🇵 · A.Schwenk🇩🇪 · C.Weinheimer🇩🇪

    The standard interpretation of direct-detection limits on dark matter involves particular assumptions of the underlying WIMP-nucleus interaction, such as, in the simplest case, the choice of a Helm form factor that phenomenologically describes an isoscalar spin-independent interaction. In general, the interaction of dark matter with the target nuclei may well proceed via different mechanisms, which would lead to a different shape of the corresponding nuclear structure factors as a function of the momentum transfer $q$. We study to what extent different WIMP-nucleus responses can be differentiated based on the $q$-dependence of their structure factors (or "form factors"). We assume an overall strength of the interaction consistent with present spin-independent limits and consider an exposure corresponding to XENON1T-like, XENONnT-like, and DARWIN-like direct detection experiments. We find that, as long as the interaction strength does not lie too much below current limits, the DARWIN settings allow a conclusive discrimination of many different response functions based on their $q$-dependence, with immediate consequences for elucidating the nature of dark matter.

    hep-phastro-ph.COhep-exnucl-thPRD(2018)·19 citations
13. 13*

    The LHC Higgs Boson Discovery: Updated implications for Finite Unified Theories and the SUSY breaking scale

    S. Heinemeyer🇪🇸 · M. Mondragon🇲🇽 · G. Patellis🇬🇷 · N. Tracas🇬🇷 · G. Zoupanos🇬🇷

    Finite Unified Theories (FUTs) are N = 1 supersymmetric Grand Unified Theories which can be made finite to all orders in perturbation theory, based on the principle of reduction of couplings. The latter consists in searching for renormalization group invariant relations among parameters of a renormalizable theory holding to all orders in perturbation theory. FUTs have proven very successful so far. In particular, they predicted the top quark mass one and half years before its experimental discovery, while around five years before the Higgs boson discovery a particular FUT was predicting the light Higgs boson in the mass range ~ 121 - 126 GeV, in striking agreement with the discovery at LHC. Here we review the basic properties of the supersymmetric theories and in particular finite theories resulting from the application of the method of reduction of couplings in their dimensionless and dimensionful sectors. Then we analyse the phenomenologically favoured FUT, based on SU(5). This particular FUT leads to a finiteness constrained version of the MSSM, which naturally predicts a relatively heavy spectrum with coloured supersymmetric particles above 2.7 TeV, consistent with the non-observation of those particles at the LHC. The electroweak supersymmetric spectrum starts below 1 TeV and large parts of the allowed spectrum of the lighter might be accessible at CLIC. The FCC-hh will be able to fully test the predicted spectrum.

    hep-phSymmetry(2018)·16 citations
14. 14*

    Vector particle scattering on the lattice

    Fernando Romero-López🇩🇪 · Akaki Rusetsky🇩🇪 · Carsten Urbach🇩🇪

    In this work, we present an explicit form of the Luescher equation and consider the construction of the operators in different irreducible representations for the case of scattering of two vector particles. The formalism is applied to scalar QED in the Higgs Phase, where the $U(1)$ gauge boson acquires mass.

    ↳ hep-lathep-phPRD(2018)·28 citations
15. 15*

    Correspondence between the physics of extremal black holes and that of stable heavy atomic nuclei

    B. P. Kosyakov🇷🇺 · E. Yu. Popov🇷🇺 · M. A. Vronsky🇷🇺

    Extremal black holes are immune of Hawking evaporation. On the other hand, some heavy atomic nuclei feature extraordinary stability to spontaneous transmutations changing their mass numbers. The fact that extremal black holes and stable nuclei share a common trait, that of defying spontaneous ejection of their constituents, suggests that a good part of nuclear physics is modelled on physics of extremal black holes through a simple version of gauge/gravity duality. A general criterion for discriminating between stable and unstable microscopic systems can be formulated to gain a new insight into some imperfectly understood phenomena, such as instability of truly neutral spinless particles (Higgs bosons, ${\pi }_0$, quarkonia, glueballs).

    ↳ hep-thgr-qchep-phnucl-thClass.Quant.Grav.(2019)·4 citations
16. 16*

    On the Scalar-Vector-Tensor Gravity: Black Hole, Thermodynamics and Geometrothermodynamics

    Phongpichit Channuie (Walailak U.)🇹🇭 · Davood Momeni (Sultan Qaboos U.)🇴🇲

    Recently, a new class of modified gravity theories formulated via an additional scalar and vector field on top of the standard tensor field has been proposed. The direct implications of these theories are expected to be relevant for cosmology and astrophysics. In the present work, we revisit the modified framework of the scalar-vector-tensor theories of gravity. Surprisingly, we discover novel metric function for the black hole solutions. We also investigate the semi-classical thermodynamics of the black holes and study the thermodynamic properties of the obtained solutions. Moreover, we quantify the entropy and the temperature of the new black hole and also calculate the heat capacity. Finally, we also apply the formalism of the geometrothermodynamics to examine thermodynamic properties of the new black hole. This formalism yields results consistent with those obtained from the usual thermodynamic implementation.

    ↳ gr-qchep-phhep-thPLB(2018)·12 citations
17. 17*

    Dark photon production through positron annihilation in beam-dump experiments

    L. Marsicano🇮🇹 · M. Battaglieri🇮🇹 · M. Bondi'🇮🇹 · C. D. R. Carvajal🇨🇴 · A. Celentano🇮🇹 · M. De Napoli🇮🇹 · R. De Vita🇮🇹 · E. Nardi🇮🇹 · M. Raggi🇮🇹 · P. Valente🇮🇹

    High energy positron annihilation is a viable mechanism to produce dark photons ($A^{\prime }$). This reaction plays a significant role in beam-dump experiments using experiments using multi-GeV electron-beams on thick targets by enhancing the sensitivity to $A^{\prime }$ production. The positrons produced by the electromagnetic shower can produce an $A^{\prime }$ via non-resonant ($e^{+}+e^{-}\to \gamma +A^{\prime }$) and resonant ($e^{+}+e^{-}\to A^{\prime }$) annihilation on atomic electrons. For visible decays, the contribution of resonant annihilation results in a larger sensitivity with respect to limits derived by the commonly used $A^{\prime }$-strahlung in certain kinematic regions. When included in the evaluation of the E137 beam-dump experiment reach, positron annihilation pushes the current limit on $\epsilon$ downwards by a factor of two in the range 33 MeV/c${}^2<m_{A^{\prime }}<120$ MeV/c${}^2$.

    ↳ hep-exhep-phPRD(2018)·109 citations
18. 18*

    Matter Lagrangian of particles and fluids

    P. P. Avelino🇵🇹 · L. Sousa🇵🇹

    We consider a model where particles are described as localized concentrations of energy, with fixed rest mass and structure, which are not significantly affected by their self-induced gravitational field. We show that the volume average of the on-shell matter Lagrangian ${\mathcal{L}}_m$ describing such particles, in the proper frame, is equal to the volume average of the trace $T$ of the energy-momentum tensor in the same frame, independently of the particle's structure and constitution. Since both ${\mathcal{L}}_m$ and $T$ are scalars, and thus independent of the reference frame, this result is also applicable to collections of moving particles and, in particular, to those which can be described by a perfect fluid. Our results are expected to be particularly relevant in the case of modified theories of gravity with nonminimal coupling to matter where the matter Lagrangian appears explicitly in the equations of motion of the gravitational and matter fields, such as $f(R,{\mathcal{L}}_m)$ and $f(R,T)$ gravity. In particular, they indicate that, in this context, $f(R,{\mathcal{L}}_m)$ theories may be regarded as a subclass of $f(R,T)$ gravity.

    ↳ gr-qcastro-ph.COhep-phhep-thPRD(2018)·43 citations
19. 19*

    The all-loop conjecture for integrands of reggeon amplitudes in N=4 SYM

    A.E. Bolshov🇷🇺 · L.V. Bork🇷🇺 · A.I. Onishchenko🇷🇺

    In this paper we present the all-loop conjecture for integrands of Wilson line form factors, also known as reggeon amplitudes, in N=4 SYM. In particular we present a new gluing operation in momentum twistor space used to obtain reggeon tree-level amplitudes and loop integrands starting from corresponding expressions for on-shell amplitudes. The introduced gluing procedure is used to derive BCFW recursions both for tree-level reggeon amplitudes and their loop integrands. In addition we provide predictions for reggeon loop integrands written in the basis of local integrals. As a check of the correctness of gluing operation at loop level we derive the expression for LO BFKL kernel in N=4 SYM.

    ↳ hep-thhep-phJHEP(2018)·11 citations
20. 20*

    Gravitational lensing of photons coupled to massive particles

    J-F. Glicenstein🇫🇷

    The gravitational deflection of massless and massive particles, both with and without spin, has been extensively studied. This paper discusses the lensing of a particle which oscillates between two interaction eigenstates. The deflection angle, lens equation and time delay between images are derived in a model of photon to hidden-photon oscillations. In the case of coherent oscillations, the coupled photon behaves as a massive particle with a mass equal to the product of the coupling constant and hidden photon mass. The conditions for observing coherent photon-hidden photon lensing are discussed.

    ↳ astro-ph.HEhep-phPRD(2018)·1 citation
21. 21*

    Inflationary predictions of double-well, Coleman-Weinberg, and hilltop potentials with non-minimal coupling

    Nilay Bostan🇹🇷 · Ömer Güleryüz🇹🇷 · Vedat Nefer Şenoğuz🇹🇷

    We discuss how the non-minimal coupling $\xi {\varphi }^{2}R$ between the inflaton and the Ricci scalar affects the predictions of single field inflation models where the inflaton has a non-zero vacuum expectation value (VEV) $v$ after inflation. We show that, for inflaton values both above the VEV and below the VEV during inflation, under certain conditions the inflationary predictions become approximately the same as the predictions of the Starobinsky model. We then analyze inflation with double-well and Coleman-Weinberg potentials in detail, displaying the regions in the $v$-$\xi$ plane for which the spectral index $n_s$ and the tensor-to-scalar ratio $r$ values are compatible with the current observations. $r$ is always larger than 0.002 in these regions. Finally, we consider the effect of $\xi$ on small field inflation (hilltop) potentials.

    ↳ astro-ph.COhep-phJCAP(2018)·31 citations
22. 22*

    Up-, down-, strange-, charm-, and bottom-quark masses from four-flavor lattice QCD

    A. Bazavov🇺🇸 · C. Bernard🇺🇸 · N. Brambilla🇩🇪 · N. Brown🇺🇸 · C. DeTar🇺🇸 · A.X. El-Khadra🇺🇸 · E. Gámiz🇪🇸 · Steven Gottlieb🇺🇸 · U.M. Heller🇺🇸 · J. Komijani🇩🇪 · A.S. Kronfeld🇺🇸 · J. Laiho🇺🇸 and 7 other authors

    We calculate the up-, down-, strange-, charm-, and bottom-quark masses using the MILC highly improved staggered-quark ensembles with four flavors of dynamical quarks. We use ensembles at six lattice spacings ranging from $a\approx 0.15$~fm to $0.03$~fm and with both physical and unphysical values of the two light and the strange sea-quark masses. We use a new method based on heavy-quark effective theory (HQET) to extract quark masses from heavy-light pseudoscalar meson masses. Combining our analysis with our separate determination of ratios of light-quark masses we present masses of the up, down, strange, charm, and bottom quarks. Our results for the $\overline{\text{MS}}$-renormalized masses are $m_u(2\text{GeV})=2.130(41)$~MeV, $m_d(2\text{GeV})=4.675(56)$~MeV, $m_s(2\text{GeV})=92.47(69)$~MeV, $m_c(3\text{GeV})=983.7(5.6)$~MeV, and $m_c(m_c)=1273(10)$~MeV, with four active flavors; and $m_b(m_b)=4195(14)$~MeV with five active flavors. We also obtain ratios of quark masses $m_c/m_s=11.783(25)$, $m_b/m_s=53.94(12)$, and $m_b/m_c=4.578(8)$. The result for $m_c$ matches the precision of the most precise calculation to date, and the other masses and all quoted ratios are the most precise to date. Moreover, these results are the first with a perturbative accuracy of ${\alpha }_s^4$. As byproducts of our method, we obtain the matrix elements of HQET operators with dimension 4 and 5: ${\overline{\Lambda }}_{\text{MRS}}=555(31)$~MeV in the minimal renormalon-subtracted (MRS) scheme, ${\mu }_{\pi }^2=0.05(22){\text{GeV}}^2$, and ${\mu }_G^2(m_b)=0.38(2){\text{GeV}}^2$. The MRS scheme [Phys. Rev. D97, 034503 (2018), arXiv:1712.04983 [hep-ph]] is the key new aspect of our method.

    ↳ hep-lathep-phPRD(2018)·182 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.