Wed·Mar 6, 2019Wednesday·March 6, 2019

1. 01*

   Large Transverse Momentum in Semi-Inclusive Deeply Inelastic Scattering Beyond Lowest Order

   B. Wang🇺🇸 · J. O. Gonzalez-Hernandez🇮🇹 · T. C. Rogers🇺🇸 · N. Sato🇺🇸

   Motivated by recently observed tension between $O\left({\alpha }_s^2\right)$ calculations of very large transverse momentum dependence in both semi-inclusive deep inelastic scattering and Drell-Yan scattering, we repeat the details of the calculation through $O\left({\alpha }_s^2\right)$ transversely differential cross section. The results confirm earlier calculations, and provide further support to the observation that tension exists with current parton distribution and fragmentation functions.

   hep-phnucl-thPRD(2019)·34 citations
2. 02*

   Momentum-space threshold resummation in $tW$ production at the LHC

   Chong Sheng Li🇨🇳 · Hai Tao Li🇺🇸 · Ding Yu Shao🇨🇭 · Jian Wang🇩🇪

   We calculate the soft-gluon corrections for $tW$ production to all orders. The soft limit is defined in the pair invariant mass or one particle inclusive kinematic schemes. We find that at NLO the contribution of the soft-gluon effect dominates in the total cross section or the differential distributions. After resumming the soft-gluon effect to all orders using the renormalization group equation, we find that the NLO+NNLL results increase the NLO cross sections by $12\%\sim 17\%$ depending on the scheme and the collider energy. Our results are in agreement with the measurements at the 8 and 13 TeV LHC. We also provide predictions for the total cross section at the 14 TeV LHC.

   hep-phJHEP(2019)·10 citations
3. 03*

   Axial Kinetic Theory and Spin Transport for Fermions with Arbitrary Mass

   Koichi Hattori🇯🇵 · Yoshimasa Hidaka🇯🇵 · Di-Lun Yang🇯🇵

   We derive the quantum kinetic theory for fermions with arbitrary mass in a background electromagnetic field from the Wigner-function approach. Since spin of massive fermions is a dynamical degree of freedom, the kinetic equations with the leading-order quantum corrections describe entangled dynamics of not only the vector- and axial-charge distributions but also of the spin polarization. Therefore, we obtain one scalar and one axial-vector kinetic equations with magnetization currents pertinent to the spin-orbit interaction. We show that our results smoothly reduce to the massless limit where the spin of massless fermions is no longer an independent dynamical degree of freedom but is enslaved by the chirality and momentum and the accordingly kinetic equations turn into the chiral kinetic theory for Weyl fermions. We provide a kinetic theory covering both the massive and massless cases, and hence resolves the problem in constructing the bridge between them. Such generalization may be crucial for applications to various physical systems. Based on our kinetic equations, we discuss the anomalous currents transported by massive fermions in thermal equilibrium.

   hep-phhep-thnucl-thPRD(2019)·158 citations
4. 04*

   A study on the correlation between poles and cuts in $\pi \pi$ scattering

   Ling-Yun Dai🇨🇳 · Xian-Wei Kang🇨🇳 · Tao Luo🇨🇳 · Ulf-G. Meißner🇩🇪

   In this paper we propose a dispersive method to describe two-body scattering with unitarity imposed. This approach is applied to elastic $\pi \pi$ scattering. The amplitudes keep single-channel unitarity and describe the experimental data well, and the low-energy amplitudes are consistent with that of chiral perturbation theory. The pole locations of the $\sigma$, $f_0(980)$, $\rho (770)$ and $f_2(1270)$ and their couplings to $\pi \pi$ are obtained. A virtual state appearing in the isospin-two S-wave is confirmed. The correlations between the left (and right) hand cut and the poles are discussed. Our results show that the poles are more sensitive to the right hand cut rather than the left hand cut. The proposed method could be used to study other two-body scattering processes.

   hep-phCommun.Theor.Phys.(2019)·6 citations
5. 05*

   A simplified recursive ${}^3{P}_0$ model for the fragmentation of polarized quarks

   A. Kerbizi🇮🇹 · X. Artru🇫🇷 · Z. Belghobsi🇩🇿 · A. Martin🇮🇹

   We revisit our recursive model for the fragmentation of polarized quarks based on the string+${}^3{P}_0$ mechanism of $q\bar{q}$ pair creation. We make a different choice for one input function of the model that simplifies the implementation in a Monte Carlo program. No new parameters are introduced, and the relevant results are the same apart from the suppression of the spin-independent correlations between successive quarks. In addition, the present version is more suitable for an interface with external event generators. The theoretical aspects and the simulation results obtained with a stand alone program are discussed in detail and compared with those of the previous version of the model.

   hep-phPRD(2019)·16 citations
6. 06*

   Solving the three-body bound-state Bethe-Salpeter equation in Minkowski space

   E. Ydrefors🇧🇷 · J.H. Alvarenga Nogueira🇧🇷 · V.A. Karmanov🇷🇺 · T. Frederico🇧🇷

   The scalar three-body Bethe-Salpeter equation, with zero-range interaction, is solved in Minkowski space by direct integration of the four-dimensional integral equation. The singularities appearing in the propagators are treated properly by standard analytical and numerical methods, without relying on any ansatz or assumption. The results for the binding energies and transverse amplitudes are compared with the results computed in Euclidean space. A fair agreement between the calculations is found.

   hep-phnucl-thPLB(2019)·18 citations
7. 07*

   Linking lepton number violation with $B$ anomalies

   Oscar Cata🇩🇪 · Thomas Mannel🇩🇪

   Hints of violation of lepton flavor universality in semileptonic $B$ decays have prompted a renewed interest in leptoquarks at the low TeV scale. Among the different scenarios suggested, some happen to violate also lepton number, yet not much attention has been paid to the expected size of the associated lepton number violating processes. In this note we examine this issue. We find that there is a single leptoquark scenario compatible with the current size of the anomalies which also violates lepton number. In this scenario (Majorana) neutrino masses are radiatively generated. With the leptoquark parameters extracted from fitting the flavor anomalies, one actually gets the right order of magnitude for neutrino masses. We examine the associated effective field theories both at the electroweak scale and at the hadronic scale and estimate the size of the most relevant lepton number violating processes.

   hep-ph24 citations
8. 08*

   Theoretical description of the $\mathbf{J}/\mathbf{\psi }\to \mathbf{\eta }({\mathbf{\eta }}^{\prime }){\mathbf{h}}_1(1380)$, $\mathbf{J}/\mathbf{\psi }\to \mathbf{\eta }({\mathbf{\eta }}^{\prime }){\mathbf{h}}_1(1170)$ and $\mathbf{J}/\mathbf{\psi }\to {\mathbf{\pi }}^0{\mathbf{b}}_1(1235{)}^0$ reactions

   Wei-Hong Liang🇨🇳 · S. Sakai🇨🇳 · E. Oset🇪🇸

   We have made a study of the $J/\psi \to {\eta }^{\prime }{h}_1,\eta h_1$ (with $h_1$ being $h_1(1170)$ and $h_1(1380)$) and $J/\psi \to {\pi }^0{b}_1(1235{)}^0$ assuming the axial vector mesons to be dynamically generated from the pseudoscalar-vector meson interaction. We have taken the needed input from previous studies of the $J/\psi \to \varphi \pi \pi ,\omega \pi \pi$ reactions. We obtain fair agreement with experimental data and provide an explanation on why the recent experiment on $J/\psi \to {\eta }^{\prime }{h}_1(1380),h_1(1380)\to K^{\ast +}{K}^{-}+c.c.$ observed in the $K^{+}{K}^{-}{\pi }^0$ mode observes the peak of the $h_1(1380)$ at a higher energy than its nominal mass.

   hep-phPRD(2019)·14 citations
9. 09*

   Factorization of jet cross sections in heavy-ion collisions

   Jian-Wei Qiu🇺🇸 · Felix Ringer🇺🇸 · Nobuo Sato🇺🇸 · Pia Zurita🇩🇪

   We propose a new phenomenological approach to establish QCD factorization of jet cross sections in the heavy-ion environment. Starting from a factorization formalism in proton-proton collisions, we introduce medium modified jet functions to capture the leading interaction of jets with the hot and dense QCD medium. A global analysis using a Monte Carlo sampling approach is performed in order to reliably determine the new jet functions from the nuclear modification factor of inclusive jets at the LHC. We find that gluon jets are significantly more suppressed due to the presence of the medium than quark jets. In addition, we observe that the jet radius dependence is directly related to the relative suppression of quark and gluon jets. Our approach may help to improve the extraction of medium properties from data.

   hep-phhep-exnucl-exnucl-thPRL(2019)·65 citations
10. 10*

    Direct CP violation in $D^{+}\to K^0({\bar{K}}^0){\pi }^{+}$ decays as a probe for new physics

    David Delepine🇲🇽 · Gaber Faisel🇹🇷 · Carlos A. Ramirez🇨🇴

    In this paper we investigate CP violation in charged decays of $D$ meson. Particularly, we study the direct CP asymmetry of the Cabibbo favored non-leptonic $D^{+}\to {\bar{K}}^0{\pi }^{+}$ and the doubly Cabibbo-suppressed decay mode $D^{+}\to K^0{\pi }^{+}$ within standard model, two Higgs doublet model with generic Yukawa structure and left right symmetric models. In the standard model, we first derive the contributions from box and di-penguin diagrams contributing to their amplitudes which are relevant to the generation of the weak phases essential for non-vanishing direct CP violation. Then, we show that these phases are so tiny leading to a direct CP asymmetry of order $10^{-11}$ in both decay modes. Regarding the two Higgs doublet model with generic Yukawa structure and after taking into account all constraints on the parameter space of the model, we show that the enhanced direct CP asymmetries can be 6 and 7 orders of magnitudes larger than the standard model prediction for $D^{+}\to {\bar{K}}^0{\pi }^{+}$ and $D^{+}\to K^0{\pi }^{+}$ respectively. Finally, within left right symmetric models, we find that sizable direct CP asymmetry of $\mathcal{O}(10^{-3})$ can be obtained for the decay mode $D^{+}\to {\bar{K}}^0{\pi }^{+}$ after respecting all relevant constraints.

    hep-phhep-exEPJC(2020)·3 citations
11. 11*

    Gluon helicity flip in a plane wave background

    Tim Adamo🇬🇧 · Anton Ilderton🇬🇧

    We compute the leading probability for a gluon to flip helicity state upon traversing a background plane wave gauge field in pure Yang-Mills theory and QCD, with an arbitrary number of colours and flavours. This is a one-loop calculation in perturbative gauge theory around the gluonic plane wave background, which is treated without approximation (i.e., to all orders in the coupling). We introduce a background-dressed version of the spinor helicity formalism and use it to obtain simple formulae for the flip amplitude with pure external gluon polarizations. We also give in-depth examples for gauge group SU(2), and evaluate both the high- and low-energy limits. Throughout, we compare and contrast with the calculation of photon helicity flip in strong-field QED.

    ↳ hep-thhep-phJHEP(2019)·23 citations
12. 12*

    Tuning the GENIE Pion Production Model with MINERvA Data

    P. Stowell🇬🇧 · L. Pickering🇺🇸 · C. Wilkinson🇨🇭 · C.V.C. Wret🇺🇸 · F. Akbar🇮🇳 · D.A. Andrade🇲🇽 · M. V. Ascencio🇵🇪 · L. Bellantoni🇺🇸 · A. Bercellie🇺🇸 · M. Betancourt🇺🇸 · A. Bodek🇺🇸 · A. Bravar🇨🇭 and 59 other authors

    Faced with unresolved tensions between neutrino interaction measurements at few-GeV neutrino energies, current experiments are forced to accept large systematic uncertainties to cover discrepancies between their data and model predictions. In this paper, the widely used pion production model in GENIE is compared to four MINERvA charged current pion production measurements using NUISANCE. Tunings, ie, adjustments of model parameters, to help match GENIE to MINERvA and older bubble chamber data are presented here. We find that scattering off nuclear targets as measured in MINERvA is not in good agreement with scattering off nucleon (hydrogen or deuterium) targets in the bubble chamber data. An additional ad hoc correction for the low-$Q^2$ region, where collective effects are expected to be large, is also presented. While these tunings and corrections improve the agreement of GENIE with the data, the modeling is imperfect. The development of these tunings within the NUISANCE frameworkallows for straightforward extensions to other neutrino event generators and models, and allows omitting and including new data sets as they become available.

    ↳ hep-exhep-phPRD(2019)·91 citations
13. 13*

    The International Linear Collider: A Global Project

    Philip Bambade🇫🇷 · Tim Barklow🇺🇸 · Ties Behnke🇩🇪 · Mikael Berggren🇩🇪 · James Brau🇺🇸 · Philip Burrows🇬🇧 · Dmitri Denisov🇺🇸 · Angeles Faus-Golfe🇫🇷 · Brian Foster🇩🇪 · Keisuke Fujii🇯🇵 · Juan Fuster🇪🇸 · Frank Gaede🇩🇪 and 20 other authors

    The International Linear Collider (ILC) is now under consideration as the next global project in particle physics. In this report, we review of all aspects of the ILC program: the physics motivation, the accelerator design, the run plan, the proposed detectors, the experimental measurements on the Higgs boson, the top quark, the couplings of the W and Z bosons, and searches for new particles. We review the important role that polarized beams play in the ILC program. The first stage of the ILC is planned to be a Higgs factory at 250 GeV in the centre of mass. Energy upgrades can naturally be implemented based on the concept of a linear collider. We discuss in detail the ILC program of Higgs boson measurements and the expected precision in the determination of Higgs couplings. We compare the ILC capabilities to those of the HL-LHC and to those of other proposed e+e- Higgs factories. We emphasize throughout that the readiness of the accelerator and the estimates of ILC performance are based on detailed simulations backed by extensive RandD and, for the accelerator technology, operational experience.

    ↳ hep-exhep-phphysics.acc-ph460 citations
14. 14*

    No scalar hair theorem for neutral Neumann stars: static massive scalar fields nonminimally coupled to gravity

    Yan Peng🇨🇳

    In a recent paper, Hod proved that spherically symmetric Dirichlet reflecting compact stars cannot support static nonminimally coupled scalar fields. In the present paper, we study the validity of no hair theorems for compact stars with Neumann surface boundary conditions. We find that Neumann compact stars cannot support static massive scalar field hairs with a generic dimensionless nonminimal coupling parameter.

    ↳ gr-qchep-phhep-thNPB(2019)·4 citations
15. 15*

    Sensitivity of elastic electron scattering off the 3He to the nucleon form factors

    Serge Bondarenko🇷🇺 · Valery Burov🇷🇺 · Sergey Yurev🇷🇺

    Elastic electron-3He scattering is studied in the relativistic impulse approximation. The amplitudes for the three-nucleon system - 3He - are obtained by solving the relativistic generalization of the Faddeev equation. The charge and magnetic form factor are calculated and compared with the experimental data for the momentum transfer squared up to 100 fm-2. The influence of the various nucleon form factors is investigated.

    ↳ nucl-thhep-phEPJ Web Conf.(2019)·2 citations
16. 16*

    Radiative contribution to the composite-Higgs potential in a two-representation lattice model

    Venkitesh Ayyar🇺🇸 · Maarten Golterman🇺🇸 · Daniel C. Hackett🇺🇸 · William I. Jay🇺🇸 · Ethan T. Neil🇺🇸 · Yigal Shamir🇮🇱 · Benjamin Svetitsky🇮🇱

    Working in a two-representation lattice gauge theory that is close to a composite Higgs model, we calculate the low-energy constant CLR which controls the contribution of the electroweak gauge bosons to the Higgs potential. In QCD, the corresponding low-energy constant governs the mass splitting of the pion multiplet. Taking the continuum and chiral limits, we find that CLR, in units of the pseudoscalar decay constant, is roughly of the same size as its QCD counterpart.

    ↳ hep-lathep-phPRD(2019)·39 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.