Tue·Jan 26, 2016Tuesday·January 26, 2016

1. 01*

   Parton Transverse Momentum and Orbital Angular Momentum Distributions

   Abha Rajan🇺🇸 · Aurore Courtoy🇲🇽 · Michael Engelhardt🇺🇸 · Simonetta Liuti🇺🇸

   The quark orbital angular momentum component of proton spin, $L_q$, can be defined in QCD as the integral of a Wigner phase space distribution weighting the cross product of the quark's transverse position and momentum. It can also be independently defined from the operator product expansion for the off-forward Compton amplitude in terms of a twist-three generalized parton distribution. We provide an explicit link between the two definitions, connecting them through their dependence on partonic intrinsic transverse momentum. Connecting the definitions provides the key for correlating direct experimental determinations of $L_q$, and evaluations through Lattice QCD calculations. The direct observation of quark orbital angular momentum does not require transverse spin polarization, but can occur using longitudinally polarized targets.

   hep-phPRD(2016)·55 citations
2. 02*

   Constraints on dark matter annihilation to fermions and a photon

   Debtosh Chowdhury🇮🇹 · Abhishek M. Iyer🇮🇳 · Ranjan Laha🇺🇸

   We consider Majorana dark matter annihilation to fermion - anti-fermion pair and a photon in the effective field theory paradigm, by introducing dimension 6 and dimension 8 operators in the Lagrangian. For a given value of the cut-off scale, the latter dominates the annihilation process for heavier dark matter masses. We find a cancellation in the dark matter annihilation to a fermion - anti-fermion pair when considering the interference of the dimension 6 and the dimension 8 operators. Constraints on the effective scale cut-off is derived while considering indirect detection experiments and the relic density requirements and they are compared to the bound coming from collider experiments.

   hep-phastro-ph.COastro-ph.HEhep-exJHEP(2018)·8 citations
3. 03*

   Neutrino observables from predictive flavour patterns

   Luis M. Cebola🇵🇹 · David Emmanuel-Costa🇵🇹 · Ricardo Gonzalez Felipe🇵🇹

   We look for predictive flavour patterns of the effective Majorana neutrino mass matrix that are compatible with current neutrino oscillation data. Our search is based on the assumption that the neutrino mass matrix contains equal elements and a minimal number of parameters, in the flavour basis where the charged lepton mass matrix is diagonal and real. Three unique patterns that can successfully explain neutrino observables at the $3\sigma$ confidence level with just three physical parameters are presented. Neutrino textures described by four and five parameters are also studied. The predictions for the lightest neutrino mass, the effective mass parameter in neutrinoless double beta decays and the CP-violating phases in the leptonic mixing are given.

   hep-phEPJC(2016)·7 citations
4. 04*

   Single Top Production at Next-to-Leading Order in the Standard Model Effective Field Theory

   Cen Zhang🇺🇸

   Single top production processes at hadron colliders provide information on the relation between the top quark and the electroweak sector of the standard model. We compute the next-to-leading order QCD corrections to the three main production channels: $t$-channel, $s$-channel and $tW$ associated production, in the standard model including operators up to dimension-six. The calculation can be matched to parton shower programs and can therefore be directly used in experimental analyses. The QCD corrections are found to significantly impact the extraction of the current limits on the operators, because both of an improved accuracy and a better precision of the theoretical predictions. In addition, the distributions of some of the key discriminating observables are modified in a nontrivial way, which could change the interpretation of measurements in terms of UV complete models.

   hep-phhep-exPRL(2016)·86 citations
5. 05*

   Improved estimate of the cross section for inverse beta decay

   Artur M. Ankowski🇺🇸

   The hypothesis of the conserved vector current, relating the vector weak and isovector electromagnetic currents, plays a fundamental role in quantitative description of neutrino interactions. Despite being experimentally confirmed with great precision, it is not fully implemented in existing calculations of the cross section for inverse beta decay, the dominant mechanism of antineutrino scattering at energies below a few tens of MeV. In this article, I estimate the corresponding cross section and its uncertainty, ensuring conservation of the vector current. While converging to previous calculations at energies of several MeV, the obtained result is appreciably lower and predicts more directional positron production near the reaction threshold. These findings suggest that in the current estimate of the flux of geologically produced antineutrinos the 232Th and 238U components may be underestimated by 6.1 and 3.7%, respectively. The proposed search for light sterile neutrinos using a 144Ce--144Pr source is predicted to collect the total event rate lower by 3% than previously estimated and to observe a spectral distortion that could be misinterpreted as an oscillation signal. In reactor-antineutrino experiments, together with a re-evaluation of the positron spectra, the predicted event rate should be reduced by 0.9%, diminishing the size of the reported anomaly.

   hep-phhep-exphysics.geo-ph19 citations
6. 06*

   Collider Signatures of Higgs-portal Scalar Dark Matter

   Huayong Han🇨🇳 · Jin Min Yang🇨🇳 · Yang Zhang🇨🇳 · Sibo Zheng🇨🇳

   In the simplest Higgs-portal scalar dark matter model, the dark matter mass has been restricted to be either near the resonant mass ($m_h/2$) or in a large-mass region by the direct detection at LHC Run 1 and LUX. While the large-mass region below roughly 3 TeV can be probed by the future Xenon1T experiment, most of the resonant mass region is beyond the scope of Xenon1T. In this paper, we study the direct detection of such scalar dark matter in the narrow resonant mass region at the 14 TeV LHC and the future 100 TeV hadron collider. We show the luminosities required for the $2\sigma$ exclusion and $5\sigma$ discovery.

   hep-phastro-ph.COhep-exPLB(2016)·66 citations
7. 07*

   Light-Front Holography, Color Confinement, and Supersymmetric Features of QCD

   Stanley J. Brodsky🇺🇸

   Light-Front Quantization provides a physical, frame-independent formalism for hadron dynamics and structure. Observables such as structure functions, transverse momentum distributions, and distribution amplitudes are defined from the hadronic light-front wavefunctions. One obtains new insights into the hadronic spectrum, light-front wavefunctions, and the functional form of the QCD running coupling in the nonperturbative domain using light-front holography -- the duality between the front form and AdS${}_5$, the space of isometries of the conformal group. In addition, superconformal algebra leads to remarkable supersymmetric relations between mesons and baryons of the same parity. The mass scale $\kappa$ underlying confinement and hadron masses can be connected to the parameter ${\Lambda }_{\overline{MS}}$ in the QCD running coupling by matching the nonperturbative dynamics, as described by the effective conformal theory mapped to the light-front and its embedding in AdS space, to the perturbative QCD regime. The result is an effective coupling defined at all momenta. This matching of the high and low momentum transfer regimes determines a scale $Q_0$ which sets the interface between perturbative and nonperturbative hadron dynamics. The use of $Q_0$ to resolve the factorization scale uncertainty for structure functions and distribution amplitudes, in combination with the principle of maximal conformality (PMC) for setting the renormalization scales, can greatly improve the precision of perturbative QCD predictions for collider phenomenology. The absence of vacuum excitations of the front-form vacuum has important consequences for the cosmological constant. I also discuss evidence that the antishadowing of nuclear structure functions is flavor dependent, and why shadowing and antishadowing phenomena may be incompatible with sum rules for nuclear parton distribution functions.

   hep-phFew Body Syst.(2016)·10 citations
8. 08*

   Radiative Neutrino Mass with $Z_3$ Dark matter: From Relic Density to LHC Signatures

   Ran Ding (Peking U.)🇨🇳 · Zhi-Long Han (Nankai U.)🇨🇳 · Yi Liao (ITP-CAS, Peking U., Nankai U.)🇨🇳 · Wan-Peng Xie (Peking U.)🇨🇳

   In this work we give a comprehensive analysis on the phenomenology of a specific ${\mathbb{Z}}_3$ dark matter (DM) model in which neutrino mass is induced at two loops by interactions with a DM particle that can be a complex scalar or a Dirac fermion. Both the DM properties in relic density and direct detection and the LHC signatures are examined in great detail, and indirect detection for gamma-ray excess from the Galactic Center is also discussed briefly. On the DM side, both semi-annihilation and co-annihilation processes play a crucial role in alleviating the tension of parameter space between relic density and direct detection. On the collider side, new decay channels resulting from ${\mathbb{Z}}_3$ particles lead to distinct signals at LHC. Currently the trilepton signal is expected to give the most stringent bound for both scalar and fermion DM candidates, and the signatures of fermion DM are very similar to those of electroweakinos in simplified supersymmetric models.

   hep-phJHEP(2016)·29 citations
9. 09*

   One Bump or Two Peaks? The 750 GeV Diphoton Excess and Dark Matter with a Complex Mediator

   Qing-Hong Cao🇨🇳 · Yin-Qiang Gong🇨🇳 · Xing Wang🇨🇳 · Bin Yan🇨🇳 · Li Lin Yang🇨🇳

   We consider the possibility that the recently observed excess in the diphoton invariant mass spectrum around 750 GeV is due to two narrow scalars. We demonstrate that there is no need to introduce invisible decay modes to enlarge the widths as long as the two scalars exhibit an appropriate mass splitting. Nevertheless we investigate the possible connection of these two scalars to the dark matter in a toy model with a Majorana fermionic dark matter candidate. We explore how large the widths of the two scalar widths could be taking into account various constraints from collider and dark matter experiments. Introducing two scalars alleviates the tension between the diphoton production and dark matter constraints.

   hep-phhep-exPRD(2016)·33 citations
10. 10*

    Lepton Mixing Predictions from Infinite Group Series $D_{9n,3n}^{(1)}$ with Generalized CP

    Cai-Chang Li🇨🇳 · Chang-Yuan Yao🇨🇳 · Gui-Jun Ding🇨🇳

    We have performed a comprehensive analysis of the type D group $D_{9n,3n}^{(1)}$ as flavor symmetry and the generalized CP symmetry. All possible residual symmetries and their consequences for the prediction of the mixing parameters are studied. We find that only one type of mixing pattern is able to accommodate the measured values of the mixing angles in both "direct" and "variant of semidirect" approaches, and four types of mixing patterns are phenomenologically viable in the "semidirect" approach. The admissible values of the mixing angles as well as CP violating phases are studied in detail for each case. It is remarkable that the first two smallest $D_{9n,3n}^{(1)}$ groups with $n=1,2$ can fits the experimental data very well. The phenomenological predictions for neutrinoless double beta decay are discussed.

    hep-phJHEP(2016)·33 citations
11. 11*

    Can the 750-GeV diphoton resonance be the singlet Higgs boson of custodial Higgs triplet model?

    Cheng-Wei Chiang🇹🇼 · An-Li Kuo🇹🇼

    The observation of diphoton excess around the mass of 750 GeV in LHC Run-II motivates us to consider whether the singlet Higgs boson in the custodial Higgs triplet model can serve as a good candidate because an earlier study of comprehensive parameter scan shows that it can have the right mass in the viable mass spectra. By assuming the singlet Higgs mass at 750 GeV, its total width less than 50 GeV and imposing constraints from the LHC 8-TeV data, we identify an approximately linear region on the $(v_{\Delta },\alpha )$ plane along which the exotic Higgs boson masses satisfy a specific hierarchy and have lower possible spectra, where $v_{\Delta }$ denotes the triplet vacuum expectation value and $\alpha$ is the mixing angle between the singlet Higgs boson and the standard model-like Higgs boson. Although the diphoton decay rate can be enhanced by charged Higgs bosons running in the loop in this region, it is mostly orders of magnitude smaller than that required for the observed production rate, except for the small $v_{\Delta }$ region when the diphoton fusion production mechanism becomes dominant. Nonetheless, this part of parameter space suffers from the problems of breakdown of perturbativity and large uncertainties in the photon parton distribution function of proton.

    hep-phhep-exPLB(2016)·37 citations
12. 12*

    Radiative and pionic transitions from the $D_{s1}(2460)$ to the $D_{s0}^{\ast }(2317)$

    Cheng-Jian Xiao🇨🇳 · Dian-Yong Chen🇨🇳 · Yong-Liang Ma🇨🇳

    We estimate the partial widths for the radiative and pionic transitions from the $D_{s1}(2460)$ to the $D_{s0}(2317)$ in a molecule scenario, in which the $D_{s1}(2460)$ and $D_{s0}^{\ast }(2317)$ are considered as hadronic molecule states of $DK$ and $D^{\ast }K$, respectively. The partial widths for the $D_{s1}(2460)\to D_{s0}^{\ast }(2317){\pi }^0$ and $D_{s1}(2460)\to D_{s0}^{\ast }(2317)\gamma$ are evaluated to be about $0.19\sim 0.22$ keV and $3.0\sim 3.1$ keV, respectively. In addition, the ratio of the $D_{s1}(2460)\to D_{s0}(2317)\gamma$ and $D_{s1}(2460)\to D_s^{\ast }{\pi }^0$ is estimated to be about $(6.6\sim 10.6)\times 10^{-2}$, which is safely under the measured upper limit.

    hep-phPRD(2016)·46 citations
13. 13*

    Charmed baryons and their interactions

    Atsushi Hosaka🇯🇵 · Emiko Hiyama🇯🇵 · SangHo Kim🇰🇷 · Hyun-Chul Kim🇰🇷 · Hideko Nagahiro🇯🇵 · Hiroyuki Noumi🇯🇵 · Makoto Oka🇯🇵 · Kotaro Shirotori🇯🇵 · Tetsuya Yoshida🇯🇵 · Shigehiro Yasui🇯🇵

    In this proceedings report, we discuss unique features of charmed, or in general heavy, baryons with one heavy quark. A well and long-term known phenomena, the distinction of the two modes of the rho and lambda type of a three-quark system is revisited. The difference of these modes may be tested in the production and decay reactions of the baryons which may be tested in the future experiments at J-PARC.

    hep-phnucl-thJPS Conf.Proc.(2017)·0 citations
14. 14*

    Neutrino Mass and Proton Decay in a Realistic Supersymmetric SO(10) Model

    Matthew Severson🇺🇸

    This work presents a complete analysis of fermion fitting and proton decay in a SUSY $SO(10)$ model previously suggested by Dutta, Mimura, and Mohapatra. A key question in any grand unified theory is whether it satisfies the experimental lower limits on proton partial lifetimes. In generic models, substantial fine-tuning is required among GUT-scale parameters to satisfy the limits. In the proposed model, the $10$, $\overline{126}$, and $120$ Yukawa couplings contributing to fermion masses have restricted textures intended to give favorable results for proton lifetime, while still giving rise to a realistic fermion sector, without the need for fine-tuning, even for large $\tan \beta$, and for either type-I or type-II dominance in the neutrino mass matrix. In this thesis, I investigate the above hypothesis at a strict numerical level of scrutiny; I obtain a valid fit for the entire fermion sector for both types of seesaw dominance, including ${\theta }_{13}$ in good agreement with the most recent data. For the case with type-II seesaw, I find that, using the Yukawa couplings fixed by the successful fermion sector fit, proton partial lifetime limits are readily satisfied for all but one of the pertinent decay modes for nearly arbitrary values of the triplet-Higgs mixing parameters, with the $K^{+}\bar{\nu }$ mode requiring a $\mathcal{O}(10^{-1})$ cancellation in order to satisfy its limit. I also find a maximum partial lifetime for that mode of $\tau (K^{+}\bar{\nu })\sim 10^{36}$years. For the type-I seesaw case, I find that $K^{+}\bar{\nu }$ decay mode is satisfied for any values of the triplet mixing parameters giving no major enhancement, and all other modes are easily satisfied for arbitrary mixing values; I also find a maximum partial lifetime for $K^{+}\bar{\nu }$ of nearly $10^{38}$years, which is sub-dominant to gauge boson decay channels.

    hep-ph3 citations
15. 15*

    Model independence of the measurement of the e+e- -> ZH cross section using Z->{\mu}+{\mu}- and Z->e+e- at the ILC

    J. Yan🇯🇵 · K. Fujii🇯🇵 · J. Tian🇯🇵

    The model independent measurement of the absolute ZH cross section of the Higgsstrahlung process e+e- -> ZH is an unique measurement at the ILC indispensable for measuring the Higgs couplings and their deviations from the Standard Model in order to identify new physics models. The performance in measuring the ZH cross section using events in which the Higgs boson recoils against a Z boson which decays into a pair of muons or electrons has been demonstrated based on full simulation of the ILD detector for three center of mass energies 250, 350, and 500 GeV, and two beam polarizations (Pe-,Pe+) =(-80%, +30%) and (+80%, -30%). This paper demonstrates in detail that the analysis which achieved these results are model independent to the sub-percent level. Data selection methods are designed to optimize the precisions of the ZH cross section and at the same time minimize the bias on the measured due to discrepancy in signal efficiencies among Higgs decay modes. Under conservative assumptions which take into account unknown Higgs decay modes, the relative bias on the ZH cross section is shown to be smaller than 0.2% for all center-of-mass energies, which is five times below even the smallest ZH cross section statistical uncertainties expected from the leptonic recoil measurements in a full 20 years ILC physics program.

    hep-phhep-ex6 citations
16. 16*

    Progress on nuclear modifications of structure functions

    S. Kumano (KEK/J-PARC)🇯🇵

    We report progress on nuclear structure functions, especially on their nuclear modifications and a new tensor structure function for the deuteron. To understand nuclear structure functions is an important step toward describing nuclei and QCD matters from low to high densities and from low to high energies in terms of fundamental quark and gluon degrees of freedom beyond conventional hadron and nuclear physics. It is also practically important for understanding new phenomena in high-energy heavy-ion collisions at RHIC and LHC. Furthermore, since systematic errors of current neutrino-oscillation experiments are dominated by uncertainties of neutrino-nucleus interactions, such studies are valuable for finding new physics beyond current framework. Next, a new tensor-polarized structure function $b_1$ is discussed for the deuteron. There was a measurement by HERMES; however, its data are inconsistent with the conventional convolution estimate based on the standard deuteron model with D-state admixture. This fact suggests that a new hadronic phenomenon should exist in the tensor-polarized deuteron at high energies, and it will be experimentally investigated at JLab from the end of 2010's.

    hep-phhep-exnucl-exnucl-thEPJ Web Conf.(2016)·0 citations
17. 17*

    The Subtleties of the Wigner Function Formulation of the Chiral Magnetic Effect

    Yan Wu🇨🇳 · Defu Hou🇨🇳 · Hai-cang Ren🇨🇳

    We assess the applicability of the Wigner function formulation in its present form to the chiral Magnetic Effect and noted some issues regarding the conservation and the consistency of the electric current in the presence of an inhomogeneous and time dependent axial chemical potential. The problems are rooted in the ultraviolet divergence of the underlying field theory associated with the axial anomaly and can be fixed with the Pauli-Villars regularization of the Wigner function.

    hep-phhep-thnucl-thPRD(2017)·24 citations
18. 18*

    The collinearly-improved Balitsky-Kovchegov equation

    E. Iancu🇫🇷 · J.D. Madrigal🇫🇷 · A.H. Mueller🇺🇸 · G. Soyez🇫🇷 · D.N. Triantafyllopoulos🇮🇹

    The high-energy evolution in perturbative QCD suffers from a severe lack-of-convergence problem, due to higher order corrections enhanced by double and single transverse logarithms. We resum double logarithms to all orders within the non-linear Balitsky-Kovchegov equation, by taking into account successive soft gluon emissions strongly ordered in lifetime. We further resum single logarithms generated by the first non-singular part of the splitting functions and by the one-loop running of the coupling. The resummed BK equation admits stable solutions, which are used to successfully fit the HERA data at small $x$ for physically acceptable initial conditions and reasonable values of the fit parameters.

    hep-phNPA(2016)·3 citations
19. 19*

    Energy loss at NLO in a high-temperature Quark-Gluon Plasma

    Jacopo Ghiglieri🇨🇭

    We present an extension of the Arnold-Moore-Yaffe kinetic equations for jet energy loss to NLO in the strong coupling constant. A novel aspect of the NLO analysis is a consistent description of wider-angle bremsstrahlung (semi-collinear emissions), which smoothly interpolates between 2<->2 scattering and collinear bremsstrahlung. We describe how many of the ingredients of the NLO transport equations (such as the drag coefficient) can be expressed in terms of Wilson line operators and can be computed using a Euclidean formalism or sum rules, both motivated by the analytic properties of amplitudes at light-like separations. We conclude with an outlook on the computation of the shear viscosity at NLO.

    hep-phnucl-thNPA(2016)·0 citations
20. 20*

    Nuclear suppression in p-A collisions from induced radiation

    François Arleo🇫🇷 · Rodion Kolevatov🇫🇷 · Stéphane Peigné🇫🇷 · Taklit Sami🇫🇷

    The current status of coherent energy loss is reviewed, both in theory and in its phenomenological applications to p-A collisions.

    hep-phEPJ Web Conf.(2016)·3 citations
21. 21*

    Radiative neutrino mass generation from WIMP dark matter

    Roberto A. Lineros🇪🇸

    The minimal seesaw extension of the Standard Model requires two electroweak singlet fermions in order to accommodate the neutrino oscillation parameters at tree level. Here we consider a next to minimal extension where light neutrino masses are generated radiatively by two electroweak fermions: one singlet and one triplet under SU(2). These should be odd under a parity symmetry and their mixing gives rise to a stable weakly interactive massive particle dark matter candidate. For mass in the GeV-TeV range, it reproduces the correct relic density, and provides an observable signal in nuclear recoil direct detection experiments. The fermion triplet component of the dark matter has gauge interactions, making it potentially detectable at present and near future collider experiments.

    hep-phJ.Phys.Conf.Ser.(2016)·0 citations
22. 22*

    Centrality-dependent forward $J/\psi$ production in high energy proton-nucleus collisions

    B. Ducloué🇫🇮 · T. Lappi🇫🇮 · H. Mäntysaari🇺🇸

    Forward $J/\psi$ production and suppression in high energy proton-nucleus collisions can be an important probe of gluon saturation. In an earlier work we studied this process in the Color Glass Condensate framework and showed that using the Glauber approach to extrapolate the dipole cross section of a proton to a nucleus leads to results closer to experimental data than previous calculations in this framework. Here we investigate the centrality dependence of the nuclear suppression in this model and show a comparison of our results with recent LHC data.

    hep-phnucl-thEPJ Web Conf.(2016)·2 citations
23. 23*

    Constraining pion interactions at very high energies by cosmic ray data

    Sergey Ostapchenko🇩🇪 · Marcus Bleicher🇩🇪

    We demonstrate that a substantial part of the present uncertainties in model predictions for the average maximum depth of cosmic ray-induced extensive air showers is related to very high energy pion-air collisions. Our analysis shows that the position of the maximum of the muon production profile in air showers is strongly sensitive to the properties of such interactions. Therefore, the measurements of the maximal muon production depth by cosmic ray experiments provide a unique opportunity to constrain the treatment of pion-air interactions at very high energies and to reduce thereby model-related uncertainties for the shower maximum depth.

    hep-phastro-ph.HEPRD(2016)·37 citations
24. 24*

    On the Interface between Perturbative and Nonperturbative QCD

    A. Deur🇺🇸 · S. J. Brodsky🇺🇸 · G. F. de Teramond🇨🇷

    The QCD running coupling ${\alpha }_s(Q^2)$ sets the strength of the interactions of quarks and gluons as a function of the momentum transfer $Q$. The $Q^2$ dependence of the coupling is required to describe hadronic interactions at both large and short distances. In this article we adopt the light-front holographic approach to strongly-coupled QCD, a formalism which incorporates confinement, predicts the spectroscopy of hadrons composed of light quarks, and describes the low-$Q^2$ analytic behavior of the strong coupling ${\alpha }_s(Q^2)$. The high-$Q^2$ dependence of the coupling ${\alpha }_s(Q^2)$ is specified by perturbative QCD and its renormalization group equation. The matching of the high and low $Q^2$ regimes of ${\alpha }_s(Q^2)$ then determines the scale $Q_0$ which sets the interface between perturbative and nonperturbative hadron dynamics. The value of $Q_0$ can be used to set the factorization scale for DGLAP evolution of hadronic structure functions and the ERBL evolution of distribution amplitudes. We discuss the scheme-dependence of the value of $Q_0$ and the infrared fixed-point of the QCD coupling. Our analysis is carried out for the $\overline{MS}$, $g_1$, $MOM$ and $V$ renormalization schemes. Our results show that the discrepancies on the value of ${\alpha }_s$ at large distance seen in the literature can be explained by different choices of renormalization schemes. We also provide the formulae to compute ${\alpha }_s(Q^2)$ over the entire range of space-like momentum transfer for the different renormalization schemes discussed in this article.

    hep-phPLB(2016)·60 citations
25. 25*

    Next-to-leading order Balitsky-Kovchegov equation with resummation

    T. Lappi🇫🇮 · H. Mäntysaari🇺🇸

    We solve the Balitsky-Kovchegov evolution equation at next-to-leading order accuracy including a resummation of large single and double transverse momentum logarithms to all orders. We numerically determine an optimal value for the constant under the large transverse momentum logarithm that enables including a maximal amount of the full NLO result in the resummation. When this value is used the contribution from the ${\alpha }_s^2$ terms without large logarithms is found to be small at large saturation scales and at small dipoles. Close to initial conditions relevant for phenomenological applications these fixed order corrections are shown to be numerically important.

    hep-phnucl-thPRD(2016)·129 citations
26. 26*

    Complete Form of Fermion Self-energy in NJL Model with External Magnetic Field

    Song Shi · Yi-Lun Du · Yong-Hui Xia · Hong-Shi Zong

    The author has consulted with us to withdraw this version from arXiv, and we both reach a consensus agreement. So we would like withdraw this paper from arXiv. For the detail of this paper and following update, one can refer to arXiv:1802.09942, which is uploaded by the author himself.

    hep-ph0 citations
27. 27*

    The Inclusion of Two-Loop SUSYQCD Corrections to Gluino and Squark Pole Masses in the Minimal and Next-to-Minimal Supersymmetric Standard Model: SOFTSUSY3.7

    B. C. Allanach🇬🇧 · Stephen P. Martin🇺🇸 · David G. Robertson🇺🇸 · Roberto Ruiz de Austri🇪🇸

    We describe an extension of the SOFTSUSY spectrum calculator to include two-loop supersymmetric QCD (SUSYQCD) corrections of order $\mathcal{O}({\alpha }_s^2)$ to gluino and squark pole masses, either in the minimal supersymmetric standard model (MSSM) or the next-to-minimal supersymmetric standard model (NMSSM). This document provides an overview of the program and acts as a manual for the new version of SOFTSUSY, which includes the increase in accuracy in squark and gluino pole mass predictions.

    hep-phhep-exComput.Phys.Commun.(2017)·24 citations
28. 28*

    Electron-deuteron DIS with spectator tagging at EIC: Development of theoretical framework

    W. Cosyn🇧🇪 · V. Guzey🇷🇺 · M. Sargsian🇺🇸 · M. Strikman🇺🇸 · C. Weiss🇺🇸

    An Electron-Ion Collider (EIC) would enable next-generation measurements of deep-inelastic scattering (DIS) on the deuteron with detection of a forward-moving nucleon (p, n) and measurement of its recoil momentum ("spectator tagging"). Such experiments offer full control of the nuclear configuration during the high-energy process and can be used for precision studies of the neutron's partonic structure and its spin dependence, nuclear modifications of partonic structure, and nuclear shadowing at small x. We review the theoretical description of spectator tagging at EIC energies (light-front nuclear structure, on-shell extrapolation in the recoil nucleon momentum, final-state interactions, diffractive effects at small x) and report about on-going developments.

    hep-phnucl-thEPJ Web Conf.(2016)·15 citations
29. 29*

    Hiding Scalar Higgs Portal Dark Matter

    Wei Chao🇺🇸

    We investigate a Higgs portal dark matter model by extending the Standard model (SM) with a complex singlet, $S=(s+ia)/\sqrt{2}$, where $a$ is a dark matter candidate and $S$ gets no vacuum expectation value but $s$ mixies with the SM Higgs via a trilinear interaction. We point out an interesting scenario, where only quartic coupling contributes to the dark matter relic abundance and there is no tree level contribution to the direct detection. Numerical analysis shows that the direction detection cross section, which arises at the one-loop level, is about $2\sim 5$ orders below the current LUX bound. Constraints from Higgs measurements as well as collider signatures of the model at the LHC are studied.

    hep-ph8 citations
30. 30*

    A democratic suggestion

    A. Kleppe🇳🇴

    Within the framework of quark mass matrices with a democratic texture, the unitary rotation matrices that diagonalize the quark matrices are obtained by a specific parametrization of the Cabibbo-Kobayashi-Maskawa mixing matrix. Different forms of democratic quark mass matrices are derived from slightly different parametrizations.

    hep-phBled Workshops Phys.(2015)·7 citations
31. 31*

    Dark Energy vs. Modified Gravity

    Austin Joyce🇺🇸 · Lucas Lombriser🇬🇧 · Fabian Schmidt🇩🇪

    Understanding the reason for the observed accelerated expansion of the Universe represents one of the fundamental open questions in physics. In cosmology, a classification has emerged among physical models for the acceleration, distinguishing between Dark Energy and Modified Gravity. In this review, we give a brief overview of models in both categories as well as their phenomenology and characteristic observable signatures in cosmology. We also introduce a rigorous distinction between Dark Energy and Modified Gravity based on the strong and weak equivalence principles.

    ↳ astro-ph.COgr-qchep-phAnn.Rev.Nucl.Part.Sci.(2016)·504 citations
32. 32*

    Electro and magneto statics of topological insulators as modeled by planar, spherical and cylindrical $\theta$ boundaries: Green function approach

    A. Martin-Ruiz🇲🇽 · M. Cambiaso🇨🇱 · L. F. Urrutia🇲🇽

    The Green function (GF) method is used to analyze the boundary effects produced by a Chern Simons (CS) extension to electrodynamics. We consider the electromagnetic field coupled to a $\theta$ term that is piecewise constant in different regions of space, separated by a common interface $\Sigma$, the $\theta$ boundary, model which we will refer to as $\theta$ electrodynamics ($\theta$ ED). This model provides a correct low energy effective action for describing topological insulators (TI). In this work we construct the static GF in $\theta$ ED for different geometrical configurations of the $\theta$ boundary, namely: planar, spherical and cylindrical $\theta$ interfaces. Also we adapt the standard Green theorem to include the effects of the $\theta$ boundary. These are the most important results of our work, since they allow to obtain the corresponding static electric and magnetic fields for arbitrary sources and arbitrary boundary conditions in the given geometries. Also, the method provides a well defined starting point for either analytical or numerical approximations in the cases where the exact analytical calculations are not possible. Explicit solutions for simple cases in each of the aforementioned geometries for $\theta$ boundaries are provided. The adapted Green theorem is illustrated by studying the problem of a point like electric charge interacting with a planar TI with prescribed boundary conditions. Our generalization, when particularized to specific cases, is successfully compared with previously reported results, most of which have been obtained by using the methods of images.

    ↳ cond-mat.mes-hallhep-phhep-thphysics.opticsPRD(2016)·49 citations
33. 33*

    Extreme blazars as counterparts of IceCube astrophysical neutrinos

    P. Padovani (1)🇮🇹 · E. Resconi (2)🇩🇪 · P. Giommi (3)🇧🇷 · B. Arsioli (3)🇮🇹 · Y. L. Chang (3) ((1) ESO, (2) TUM, (3) ASDC)🇮🇹

    We explore the correlation of $\gamma$-ray emitting blazars with IceCube neutrinos by using three very recently completed, and independently built, catalogues and the latest neutrino lists. We introduce a new observable, namely the number of neutrino events with at least one $\gamma$-ray counterpart, $N_{\nu }$. In all three catalogues we consistently observe a positive fluctuation of $N_{\nu }$ with respect to the mean random expectation at a significance level of $0.4-1.3$ per cent. This applies only to extreme blazars, namely strong, very high energy $\gamma$-ray sources of the high energy peaked type, and implies a model-independent fraction of the current IceCube signal $\sim 10-20$ per cent. An investigation of the hybrid photon -- neutrino spectral energy distributions of the most likely candidates reveals a set of $\approx 5$ such sources, which could be linked to the corresponding IceCube neutrinos. Other types of blazars, when testable, give null correlation results. Although we could not perform a similar correlation study for Galactic sources, we have also identified two (further) strong Galactic $\gamma$-ray sources as most probable counterparts of IceCube neutrinos through their hybrid spectral energy distributions. We have reasons to believe that our blazar results are not constrained by the $\gamma$-ray samples but by the neutrino statistics, which means that the detection of more astrophysical neutrinos could turn this first hint into a discovery.

    ↳ astro-ph.HEastro-ph.GAhep-exhep-phMNRAS(2016)·153 citations
34. 34*

    Measurement of the $\varphi \to {\pi }^0{e}^{+}{e}^{-}$ transition form factor with the KLOE detector

    KLOE-2 Collaboration: A. Anastasi · D. Babusci · G. Bencivenni · M. Berlowski · C. Bloise · F. Bossi · P. Branchini · A. Budano · L. Caldeira Balkeståhl · B. Cao · F. Ceradini · P. Ciambrone and 51 other authors

    A measurement of the vector to pseudoscalar conversion decay $\varphi \to {\pi }^0{e}^{+}{e}^{-}$ with the KLOE experiment is presented. A sample of $\sim 9500$ signal events was selected from a data set of 1.7 fb${}^{-1}$ of $e^{+}{e}^{-}$ collisions at $\sqrt{s}\sim m_{\varphi }$ collected at the DA$\Phi$NE $e^{+}{e}^{-}$ collider. These events were used to obtain the first measurement of the transition form factor $|F_{\varphi {\pi }^0}(q^2)|$ and a new measurement of the branching ratio of the decay: $\mathrm{BR}(\varphi \to {\pi }^0{\mathrm{e}}^{+}{\mathrm{e}}^{-})=(1.35\pm 0.05_{-0.10}^{+0.05})\times 10^{-5}$. The result improves significantly on previous measurements and is in agreement with theoretical predictions.

    ↳ hep-exhep-phPLB(2016)·49 citations
35. 35*

    Physics case of FCC-ee

    David d'Enterria🇨🇭

    The physics case for electron-positron beams at the Future Circular Collider (FCC-ee) is succinctly summarized. The FCC-ee core program involves $e^{+}{e}^{-}$ collisions at $\sqrt{s}$ = 90, 160, 240, and 350 GeV with multi-ab${}^{-1}$ integrated luminosities, yielding about 10${}^{12}$ Z bosons, 10${}^8$ W${}^{+}$W${}^{-}$ pairs, 10${}^6$ Higgs bosons and 4$\cdot$10${}^5$ $t\bar{t}$ pairs per year. The huge luminosities combined with $100$ keV knowledge of the c.m. energy will allow for Standard Model studies at unrivaled precision. Indirect constraints on new physics can thereby be placed up to scales ${\Lambda }_{{}_{\mathrm{NP}}}\approx$ 7 and 100 TeV for particles coupling respectively to the Higgs and electroweak bosons.

    ↳ hep-exhep-phFrascati Phys.Ser.(2016)·40 citations
36. 36*

    On D-brane-Anti D-brane Effective actions and their all order Bulk Singularity Structures

    Ehsan Hatefi🇬🇧

    All four point functions of brane anti brane system including their correct all order ${\alpha }^{\prime }$ corrections have been addressed. All five point functions of one closed string Ramond-Ramond (RR), two real tachyons and either one gauge field or the scalar field in both symmetric and asymmetric pictures have also been explored. The entire analysis of $<C^{-2}{A}^0{T}^0{T}^0>$ is carried out. Not only does it fix the vertex operator of RR in asymmetric picture and in higher point functions of string theory amplitudes but also it confirms the fact that there is no issue of picture dependence of the mixed closed RR, gauge fields, tachyons and fermion fields in all symmetric or anti symmetric ones. We compute $<C^{-2}{\varphi }^0{T}^0{T}^0>$ S-matrix in the presence of a transverse scalar field, two real tachyons and that reveals two different kinds of bulk singularity structures, involving an infinite number of $u$- channel gauge field and $(u+s^{\prime }+t^{\prime })$- channel scalar bulk poles. In order to produce all those bulk singularity structures, we define various couplings at the level of the effective field theory that involve the mixing term of Chern-Simons coupling (with C-potential field) and a covariant derivative of the scalar field that comes from the pull-back of brane. Eventually we explore their all order ${\alpha }^{\prime }$ corrections in the presence of brane anti brane system where various remarks will be also pointed out.

    ↳ hep-thgr-qchep-phmath-ph+1JCAP(2016)·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.