Wed·Nov 21, 2018Wednesday·November 21, 2018

1. 01*

   Testing quantum decoherence at DUNE

   Jose Carpio🇵🇪 · Eduardo Massoni🇵🇪 · Alberto Gago🇵🇪

   We address some theoretical issues of the quantum decoherence phenomenon within the neutrino oscillation framework and carry out various tests under DUNE simulated experimental environment. On the theoretical side, we provide a general expression for an invariant decoherence matrix under a quantum basis rotation. On the simulated experimental side, considering a rotation invariant and a non-invariant decoherence matrix, we study the impact on the fitting of the standard oscillation parameters, the sensitivity in the mass hierarchy and CP violation, combining the neutrino and antineutrino mode and all available neutrino oscillation probabilities channels. Furthermore, a sensitivity for the decoherence parameter of order $10^{-24}\text{GeV}$ at 3$\sigma$, is obtained for our best case.

   hep-phPRD(2019)·31 citations
2. 02*

   Atomki Anomaly in Family-Dependent $U(1{)}^{\prime }$ Extension of the Standard Model

   Luigi Delle Rose🇮🇹 · Shaaban Khalil🇪🇬 · Simon J.D. King🇬🇧 · Stefano Moretti🇬🇧 · Ahmed M. Thabt🇪🇬

   In the context of a gauge invariant, non-anomalous and family-dependent (non-universal) $U(1{)}^{\prime }$ extension of the Standard Model, wherein a new high scale mechanism generates masses and couplings for the first two fermion generations and the standard Higgs mechanism does so for the third one, we find solutions to the anomaly observed by the Atomki collaboration in the decay of excited states of Beryllium, in the form of a very light $Z^{\prime }$ state, stemming from the $U(1{)}^{\prime }$ symmetry breaking, with significant axial couplings so as to evade a variety of low scale experimental constraints.

   hep-phPRD(2019)·48 citations
3. 03*

   Search for steady point-like sources in the astrophysical muon neutrino flux with 8 years of IceCube data

   IceCube Collaboration: M. G. Aartsen🇳🇿 · M. Ackermann🇩🇪 · J. Adams🇳🇿 · J. A. Aguilar🇧🇪 · M. Ahlers🇩🇰 · M. Ahrens🇸🇪 · D. Altmann🇩🇪 · K. Andeen🇺🇸 · T. Anderson🇺🇸 · I. Ansseau🇧🇪 · G. Anton🇩🇪 · C. Argüelles🇺🇸 and 316 other authors

   The IceCube Collaboration has observed a high-energy astrophysical neutrino flux and recently found evidence for neutrino emission from the blazar TXS 0506+056. These results open a new window into the high-energy universe. However, the source or sources of most of the observed flux of astrophysical neutrinos remains uncertain. Here, a search for steady point-like neutrino sources is performed using an unbinned likelihood analysis. The method searches for a spatial accumulation of muon-neutrino events using the very high-statistics sample of about $497000$ neutrinos recorded by IceCube between 2009 and 2017. The median angular resolution is $\sim 1^{\circ }$ at 1 TeV and improves to $\sim 0.3^{\circ }$ for neutrinos with an energy of 1 PeV. Compared to previous analyses, this search is optimized for point-like neutrino emission with the same flux-characteristics as the observed astrophysical muon-neutrino flux and introduces an improved event-reconstruction and parametrization of the background. The result is an improvement in sensitivity to the muon-neutrino flux compared to the previous analysis of $\sim 35\%$ assuming an $E^{-2}$ spectrum. The sensitivity on the muon-neutrino flux is at a level of $E^2\mathrm{d}N/\mathrm{d}E=3\cdot 10^{-13}\mathrm{TeV}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$. No new evidence for neutrino sources is found in a full sky scan and in an a priori candidate source list that is motivated by gamma-ray observations. Furthermore, no significant excesses above background are found from populations of sub-threshold sources. The implications of the non-observation for potential source classes are discussed.

   hep-phastro-ph.HEEPJC(2019)·180 citations
4. 04*

   Predicting the Sparticle Spectrum from Partially-Composite Supersymmetry

   Yusuf Buyukdag🇺🇸 · Tony Gherghetta🇺🇸 · Andrew S. Miller🇺🇸

   We use the idea of partial compositeness in a minimal supersymmetric model to relate the fermion and sfermion masses. By assuming that the Higgs and third-generation matter is (mostly) elementary, while the first- and second-generation matter is (mostly) composite, the Yukawa coupling hierarchy can be explained by a linear mixing between elementary states and composite operators with large anomalous dimensions. If the composite sector also breaks supersymmetry, then composite sfermions such as selectrons are predicted to be much heavier than the lighter elementary stops. This inverted sfermion mass hierarchy is consistent with current experimental limits that prefer light stops ($\mathcal{O}(10)$ TeV) to accommodate the 125 GeV Higgs boson, while predicting heavy first- and second-generation sfermions ($\gtrsim 100$ TeV) as indicated by flavor physics experiments. The underlying dynamics can be modelled by a dual 5D gravity theory that also predicts a gravitino dark matter candidate ($\gtrsim$ keV), together with gauginos and Higgsinos, ranging from 10-90 TeV, that are split from the heavier first- and second-generation sfermion spectrum. This intricate connection between the fermion and sfermion mass spectrum can be tested at future experiments.

   hep-phPRD(2019)·6 citations
5. 05*

   Electroweak baryogenesis via bottom transport

   Tanmoy Modak🇹🇼 · Eibun Senaha🇰🇷

   We consider a scenario in which an extra bottom Yukawa coupling can drive electroweak baryogenesis in the general two-Higgs doublet model. It is found that the new bottom Yukawa coupling with $\mathcal{O}(0.1)$ in magnitude can generate the sufficient baryon asymmetry without conflicting existing data. We point out that future measurements of the bottom Yukawa coupling at High-Luminosity Large Hadron Collider and International Linear Collider, together with the CP asymmetry of $B\to X_s\gamma$ at SuperKEKB provide exquisite probes for this scenario.

   hep-phhep-exPRD(2019)·43 citations
6. 06*

   Implications of the detection of primordial gravitational waves for the Standard Model

   G. Franciolini🇨🇭 · G.F. Giudice🇨🇭 · D. Racco🇨🇭 · A. Riotto🇨🇭

   The detection of primordial gravitational waves would not only have extraordinary implications for our understanding of early cosmology, but would also give non-trivial constraints on Standard Model parameters, under the assumption that no new physics enters below the Higgs instability scale. We study the resulting bounds on the top quark mass and the strong coupling constant, discussing their theoretical uncertainties and their robustness against changes in other parameters.

   hep-phastro-ph.COgr-qchep-thJCAP(2019)·31 citations
7. 07*

   Probing vorticity in heavy ion collision with dilepton production

   Jitesh R Bhatt🇮🇳 · Hiranmaya Mishra🇮🇳 · Balbeer Singh🇮🇳

   We study the effect of vorticity present in heavy ion collisions (HICs) on the temperature evolution of hot quark-gluon plasma in the presence of spin-vorticity coupling. The initial global rotation entails a nontrivial dependence of the longitudinal flow velocity on the transverse coordinates and also develops a transverse velocity component that depends upon the longitudinal coordinate. Both of these velocities lead to a 2+1 dimensional expansion of the fireball. It is observed that with finite vorticity and spin-polarization the fireball cools faster as compared to the case without vorticity. Furthermore, we discuss the consequence of this on the production of thermal dileptons.

   hep-phnucl-thPRD(2019)·13 citations
8. 08*

   Radially excited $\psi$ mesons and the $Y$ enhancements

   Susana Coito🇵🇱

   While many properties of the vector charmonium first excitations are yet to be measured, enhancements at unexpected energies are intriguing, alias the $Y$ states. In order to understand the naturally unquenched mesonic line-shapes, the influence of the most relevant hadronic decay channels must be taken into account. Within an unitary effective approach we present results where mesonic loops are included in an equivalent manner to coupled-channels. We show results for the $\psi (3770)$ and $\psi (4160)$ systems, where we find the nonperturbative effects of dynamical generation of poles and line-shape distortion.

   hep-phPoS(2018)·1 citation
9. 09*

   Angular distribution as an effective probe of new physics in semi-hadronic three-body meson decays

   C. S. Kim🇰🇷 · Seong Chan Park🇰🇷 · Dibyakrupa Sahoo🇰🇷

   We analyze, in a fully model-independent manner, the effects of new physics on a few semi-hadronic three-body meson decays of the type $P_i\to P_f{f}_1{f}_2$, where $P_i$, $P_f$ are well chosen pseudo-scalar mesons and $f_{1,2}$ denote fermions out of which at least one gets detected in experiments. We find that the angular distribution of events of these decays can probe many interesting new physics, such as the nature of the intermediate particle that can cause lepton-flavor violation, or presence of heavy sterile neutrino, or new intermediate particles, or new interactions. We also provide angular asymmetries which can quantify the effects of new physics in these decays. We illustrate the effectiveness of our proposed methodology with a few well chosen decay modes showing effects of certain new physics possibilities without any hadronic uncertainties.

   hep-phPRD(2019)·3 citations
10. 10*

    Constraints on dimension-seven operators with a derivative in effective field theory for Dirac dark matter

    Tong Li🇨🇳 · Yi Liao🇨🇳

    The effective field theory (EFT) for dark matter (DM) has been widely used to investigate dark matter detection in both theoretical prediction and experimental analysis. To form a complete basis of effective operators for Dirac DM EFT at dimension seven, eight new four-fermion operators with a derivative in DM currents have recently been introduced. We discuss the experimental observables and constraints for the theoretical predictions of these new operators to constrain the DM mass and relevant energy scale. The observables from thermal relic abundance, indirect and direct detection, and LHC constraints are presented.

    hep-phPLB(2019)·2 citations
11. 11*

    2 Higgs Doublet Model Evolver -- Manual

    Joel Oredsson🇸🇪

    Two-Higgs-Doublet Model Evolver (2HDME) is a C++ program that provides the functionality to perform fast renormalization group equation running of the general, potentially CP-violating, 2 Higgs Doublet Model at 2-loop order. Simple tree-level calculations of masses; calculations of the oblique parameters S, T and U; different parameterizations of the scalar potential; tests of perturbativity, unitarity and tree-level stability of the scalar potential are also implemented. We briefly describe the 2HDME's structure, provide a demonstration of how to use it and list some of the most useful functions.

    hep-phComput.Phys.Commun.(2019)·20 citations
12. 12*

    A plausible explanation of ${\rm Y}(10860)$

    Roberto Bruschini🇪🇸 · Pedro González🇪🇸

    We show that a good description of the ${\rm Y}(10860)$ properties, in particular the mass, the $e^{+}{e}^{-}$ leptonic widths and the ${\pi }^{+}{\pi }^{-}{\rm Y}(ns)$$(n=1,2,3)$ production rates, can be obtained under the assumption that ${\rm Y}(10860)$ is a mixing of the conventional ${\rm Y}(5s)$ quark model state with the lowest $P-$ wave hybrid state.

    hep-phPLB(2019)·12 citations
13. 13*

    Subleading power corrections to $B\to \gamma l\nu$ decay in PQCD approach

    Yue-Long Shen🇨🇳 · Zhi-Tian Zou🇨🇳 · Yan-Bing Wei🇨🇳

    The leptonic radiative decay $B\to \gamma l\nu$ is of great importance in the determination of $B$ meson wave functions, and evaluating the form factors $F_{V,A}$ are the essential problem on the study of this channel. We computed next-to-leading power corrections to the form factors within the framework of PQCD approach, including the power suppressed hard kernel, the contribution from a complete set of three-particle $B$ meson wave functions up to twist-4 and two-particle off light-cone wave functions, the $1/m_b$ corrections in heavy quark effective theory, and the contribution from hadronic structure of photon. In spite of large theoretical uncertainties, the overall power suppressed contributions decreases about $50\%$ of the leading power result. The ${\lambda }_B$ dependence of the integrated branching ratio is reduced after including the subleading power contributions, thus the power corrections lead to more ambiguity in the determination of ${\lambda }_B$ from $B\to \gamma l\nu$ decay.

    hep-phPRD(2019)·28 citations
14. 14*

    Freeze-in leptogenesis with 3 right-handed neutrinos

    Michele Lucente🇧🇪 · Asmaa Abada🇫🇷 · Giorgio Arcadi🇩🇪 · Valerie Domcke🇩🇪 · Marco Drewes🇧🇪 · Juraj Klaric🇩🇪

    We provide the first systematic study of the viable parameter space for leptogenesis in the type-I seesaw model with three right-handed neutrinos whose Majorana masses lie below the electroweak scale. We highlight the very rich phenomenology of this scenario and discuss several mechanisms that can help to enhance the baryon asymmetry of the Universe. This allows for much larger heavy neutrino mixing angles than in the minimal scenario with two heavy neutrinos, resulting in solutions that can be probed with the LHC and other experiments. The light neutrino masses can be protected from radiative corrections by an approximate symmetry related to generalised lepton number.

    hep-phPoS(2019)·2 citations
15. 15*

    Theoretical Constraints on Supersymmetric Models: Perturbative Unitarity vs. Vacuum Stability

    Florian Staub🇩🇪

    There are nowadays strong experimental constraints on supersymmetric theories from the Higgs measurements as well as from the null results in Sparticle searches. However, even the parameter spaces which are in agreement with experimental data can be further constrained by using theoretical considerations. Here, we discuss for the MSSM and NMSSM the impact of perturbative unitarity as well as of the stability of the one-loop effective potential. We find in the case of the MSSM, that vacuum stability is always the stronger constraint. On the other side, the situation is more diverse in the NMSSM and one should always check both kind of constraints.

    hep-phPLB(2019)·9 citations
16. 16*

    Review of Calculators for BSM Higgs bosons

    Florian Staub🇩🇪

    We have reached a new era of particle physics in which the properties of the Higgs boson, in particular its mass, turned into precision observables. Therefore, it is necessary to have accurate predictions of these properties in models for new physics. I give an overview of available tools for supersymmetric and non-supersymmetric models which are publically available. Afterwards, the main idea behind generic tools to study a large variety of models is summarised. Also some remarks about the validity of checks for perturbative unitarity, which are often applied for non-supersymmetric models, are given.

    hep-phPoS(2019)·0 citations
17. 17*

    The Global Higgs Picture at 27 TeV

    Anke Biekötter🇩🇪 · Dorival Gonçalves🇺🇸 · Tilman Plehn🇩🇪 · Michihisa Takeuchi🇯🇵 · Dirk Zerwas🇫🇷

    We estimate the reach of global Higgs analyses at a 27 TeV hadron collider in terms of Higgs couplings and in terms of a gauge-invariant effective Lagrangian, including invisible Higgs decays and the Higgs self-coupling. The new collider will indirectly probe new physics in the TeV range and allow for a meaningful test of the Higgs self-coupling also embedded in a global analysis.

    hep-phSciPost Phys.(2019)·25 citations
18. 18*

    Cosmological Abundance of Colored Relics

    Christian Gross🇮🇹 · Andrea Mitridate🇮🇹 · Michele Redi🇮🇹 · Juri Smirnov🇩🇰 · Alessandro Strumia🇮🇹

    The relic cosmological abundance of stable or long-lived neutral colored particles gets reduced by about a few orders of magnitude by annihilations that occur after QCD confinement. We compute the abundance and the cosmological bounds on relic gluinos. The same post-confinement effect strongly enhances co-annihilations with a lighter Dark Matter particle, provided that their mass difference is below a few GeV. Charged colored particles (such as stops) can instead form baryons, which can be (quasi)stable in some models.

    hep-phPRD(2019)·43 citations
19. 19*

    On the Consistent Use of Scale Variations in PDF Fits and Predictions

    L. A. Harland-Lang🇬🇧 · R. S. Thorne🇬🇧

    We present an investigation of the theoretical uncertainties in parton distribution functions (PDFs) due to missing higher-order corrections in the perturbative predictions used in the fit, and their relationship to the uncertainties in subsequent predictions made using the PDFs. We consider in particular the standard approach of factorization and renormalization scale variation, and derive general results for the consistent application of these at the PDF fit stage. To do this, we use the fact that a PDF fit may be recast in a physical basis, where the PDFs themselves are bypassed entirely, and one instead relates measured observables to predicted ones. In the case of factorization scale variation we find that in various situations there is a high degree of effective correlation between the variation in the fit and in predicted observables. In particular, including such a variation in both cases can lead to an exaggerated theoretical uncertainty. More generally, a careful treatment of this correlation appears mandatory, at least within the standard scale variation paradigm. For the renormalization scale, the situation is less straightforward, but again we highlight the potential for correlations between related processes in the fit and predictions to enter at the same level as between processes in the fit or prediction alone.

    hep-phhep-exEPJC(2019)·62 citations
20. 20*

    R-symmetry for Higgs alignment without decoupling

    Karim Benakli🇫🇷 · Yifan Chen🇫🇷 · Gaëtan Lafforgue-Marmet🇫🇷

    It has been observed that an automatic alignment without decoupling is predicted at tree-level in a Two-Higgs Doublet Model (2HDM) with extended supersymmetry in the gauge and Higgs sectors. Moreover, it was found that radiative corrections preserve this alignment to a very good precision. We show that it is the non-abelian global $SU(2{)}_R$ R-symmetry that is at the origin of this alignment. This differs from previously considered Higgs family symmetries as it is present only in the quartic part of the Higgs potential. It can not be imposed to the quadratic part which has to be generated by $N=1$ supersymmetry breaking sectors. This absence of symmetry does not spoil alignment at the minimimum of the potential. We show how the (small) misalignment induced by higher order corrections can be described as the appearance of non-singlet representations of $SU(2{)}_R$ in the quartic potential.

    hep-phhep-thEPJC(2019)·18 citations
21. 21*

    Detecting the Stimulated Decay of Axions at Radio Frequencies

    A.Caputo🇪🇸 · M. Regis🇮🇹 · M.Taoso🇮🇹 · S. J. Witte🇪🇸

    Assuming axion-like particles account for the entirety of the dark matter in the Universe, we study the possibility of detecting their decay into photons at radio frequencies. We discuss different astrophysical targets, such as dwarf spheroidal galaxies, the Galactic Center and halo, and galaxy clusters. The presence of an ambient radiation field leads to a stimulated enhancement of the decay rate; depending on the environment and the mass of the axion, the effect of stimulated emission may amplify the photon flux by serval orders of magnitude. For axion-photon couplings allowed by astrophysical and laboratory constraints(and possibly favored by stellar cooling), we find the signal to be within the reach of next-generation radio telescopes such as the Square Kilometer Array.

    hep-phastro-ph.GAJCAP(2019)·126 citations
22. 22*

    DM+$b\bar{b}$ simulations with DMSimp: an update

    Yoav Afik🇮🇱 · Fabio Maltoni🇧🇪 · Kentarou Mawatari🇯🇵 · Priscilla Pani🇩🇪 · Giacomo Polesello🇮🇹 · Yoram Rozen🇮🇱 · Marco Zaro🇳🇱

    Searches for dark matter (DM) produced using collider data probe wide regions of the allowed parameter space of many models and have become competitive with more traditional searches. The interpretations of the results can be efficiently performed in simplified models, which feature only a mediator and a DM candidate together with the interactions among them and the standard model particles. The DMSimp model in FeynRules currently features a wide set of $s$-channel simplified models and can be exploited by the MadGraph5_aMC@NLO framework to produce event samples including NLO QCD corrections for realistic simulations. Higher-order corrections typically have a sizeable impact on the total production rate and lead to a reduction of the theoretical uncertainties. In this short note we report on a recent update of the DMSimp model, which makes it possible to simulate dark matter production in association with bottom quarks in a mixed four-flavour scheme, where the $\overline{\mathrm{MS}}$ renormalisation for the bottom-quark Yukawa is employed, while the bottom quark mass is on shell. By comparing with five-flavour scheme, we show that the mixed four-flavor scheme provides reliable predictions for DM+$b\bar{b}$ final states in a wide range of DM masses.

    ↳ hep-exhep-ph9 citations
23. 23*

    Simulation of dynamical (u,d,s,c) domain-wall/overlap quarks at the physical point

    Ting-Wai Chiu (TWQCD collaboration)🇹🇼

    We perform hybrid Monte-Carlo simulation of $N_f=2+1+1$ lattice QCD with domain-wall quarks at the physical point. The simulation is carried out on the $L^3\times T=64^3\times 64$ lattice with lattice spacing $a\sim 0.064$ fm ($L>4$ fm, and $M_{\pi }L>3$), using the Nvidia DGX-1 (8 V100 GPUs interconnected by the NVLink). To attain the maximal chiral symmetry for a finite extent ($N_s=16$) in the fifth dimension, we use the optimal domain-wall fermion for the quark action, together with the exact one-flavor action for domain-wall fermion. We outline the salient features of our simulation (without topology freezing, and small residual mass), together with the preliminary result of the masses of ${\pi }^{\pm }$, $K^{\pm }$, and $D^{\pm }$.

    ↳ hep-lathep-phPoS(2018)·4 citations
24. 24*

    Mimicking alternatives to inflation with interacting spectator fields

    Guillem Domènech🇩🇪 · Javier Rubio🇩🇪 · Julius Wons🇩🇪

    It has been argued that oscillatory features from spectator fields in the primordial power spectrum could be a probe of alternatives to inflation. In this work, we soften this claim by showing that the frequency and amplitude dependence of the patterns appearing in these scenarios could be mimicked by field interactions during inflation. The degeneracy of the frequency holds for the $n$-point correlation functions, while the degeneracy of the amplitude is broken at the level of non-gaussianities.

    ↳ astro-ph.COgr-qchep-phPLB(2019)·21 citations
25. 25*

    Wigner - Weyl formalism and the propagator of Wilson fermions in the presence of varying external electromagnetic field

    M.Suleymanov🇮🇱 · M.A.Zubkov🇮🇱

    We develop Wigner - Weyl formalism for the lattice models. For the definiteness we consider Wilson fermions in the presence of $U(1)$ gauge field. The given technique reduces calculation of the two point fermionic Green function to solution of the Groenewold equation. It relates Wigner transformation of the Green function with the Weyl symbol $Q_W$ of Wilson Dirac operator. We derive the simple expression for $Q_W$ in the presence of varying external $U(1)$ gauge field. Next, we solve the Groenewold equation to all orders in powers of the derivatives of $Q_W$. Thus the given technique allows to calculate the fermion propagator in the lattice model with Wilson fermions in the presence of arbitrary background electromagnetic field. The generalization of this method to the other lattice models is straightforward.

    ↳ hep-lathep-phNPB(2019)·25 citations
26. 26*

    Hadronic light-by-light scattering in the anomalous magnetic moment of the muon

    Nils Asmussen🇩🇪 · Antoine Gérardin🇩🇪 · Andreas Nyffeler🇩🇪 · Harvey B. Meyer🇩🇪

    Hadronic light-by-light scattering in the anomalous magnetic moment of the muon $a_{\mu }$ is one of two hadronic effects limiting the precision of the Standard Model prediction for this precision observable, and hence the new-physics discovery potential of direct experimental determinations of $a_{\mu }$. In this contribution, we report on recent progress in the calculation of this effect achieved both via dispersive and lattice QCD methods.

    ↳ hep-lathep-phSciPost Phys.Proc.(2019)·18 citations
27. 27*

    Nucleon-to-Roper electromagnetic transition form factors at large-$Q^2$

    Chen Chen🇧🇷 · Ya Lu🇨🇳 · Daniele Binosi🇮🇹 · Craig D. Roberts🇺🇸 · Jose Rodríguez-Quintero🇪🇸 · Jorge Segovia🇪🇸

    High-precision nucleon-resonance electroproduction data on a large kinematic domain of energy and momentum transfer have proven crucial in revealing novel features of strong interactions within the Standard Model and unfolding structural details of baryon excited states. Thus, in anticipation of new data reaching to unprecedented photon virtuality, we employ a quark-diquark approximation to the three valence-quark bound-state problem to compute ${\gamma }^{\ast }p\to R^{+}$ and ${\gamma }^{\ast }n\to R^0$ transition form factors on $Q^2/m_N^2\in [0,12]$, where $m_N$ is the nucleon mass. Having simultaneously analysed both charged and neutral channels, we also provide a quark-flavour separation of the transition form factors. The results should be useful in planning new-generation experiments.

    ↳ nucl-thhep-lathep-phnucl-exPRD(2019)·65 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.