Tue·Apr 19, 2016Tuesday·April 19, 2016

1. 01*

   Dark photons in the Dalitz-like decay of a scalar

   G.A. Kozlov🇷🇺

   The couplings of the Standard Model sector to the scale invariant degrees of freedom can open the possibility to study dark photons (DP). The Dalitz-like decay of the (Higgs-like) scalar boson into a single photon and DP is studied. The interaction between DP and quarks is mediated by the derivative of the scalar field - the dilaton, the virtual (fictitious) state. The mass of the dilaton does not enter the final solutions. Upper limits are set on the DP mass, the mixing strength between the standard photon and DP. The model does allow to estimate the DP mass with the value of 4.5 MeV.

   hep-phhep-th0 citations
2. 02*

   FormCalc 9 and Extensions

   T. Hahn🇩🇪 · S. Passehr🇩🇪 · C. Schappacher🇩🇪

   We present Version 9 of the Feynman-diagram calculator FormCalc and a flexible new suite of shell scripts and Mathematica packages based on FormCalc, which can be adapted and used as a template for calculations.

   hep-phPoS(2016)·101 citations
3. 03*

   Review of strongly-coupled composite dark matter models and lattice simulations

   Graham D. Kribs🇺🇸 · Ethan T. Neil🇺🇸

   We review models of new physics in which dark matter arises as a composite bound state from a confining strongly-coupled non-Abelian gauge theory. We discuss several qualitatively distinct classes of composite candidates, including dark mesons, dark baryons, and dark glueballs. We highlight some of the promising strategies for direct detection, especially through dark moments, using the symmetries and properties of the composite description to identify the operators that dominate the interactions of dark matter with matter, as well as dark matter self-interactions. We briefly discuss the implications of these theories at colliders, especially the (potentially novel) phenomenology of dark mesons in various regimes of the models. Throughout the review, we highlight the use of lattice calculations in the study of these strongly-coupled theories, to obtain precise quantitative predictions and new insights into the dynamics.

   hep-phastro-ph.COhep-latInt.J.Mod.Phys.A(2016)·222 citations
4. 04*

   Pure Gravitational Dark Matter, Its Mass and Signatures

   Yong Tang🇰🇷 · Yue-Liang Wu🇨🇳

   In this study, we investigate a scenario that dark matter (DM) has only gravitational interaction. In the framework of effective field theory of gravity, we find that DM is still stable at tree level even if there is no symmetry to protect its longevity, but could decay into standard model particles due to gravitational loop corrections. The radiative corrections can lead to both higher- and lower-dimensional effective operators. We also first explore how DM can be produced in the early universe. Through gravitational interaction at high temperature, DM is then found to have mass around TeV $\lesssim m_X\lesssim 10^{11}$GeV to get the right relic abundance. When DM decays, it mostly decays into gravitons, which could be tested by current and future CMB experiments. We also estimate the resulting fluxes for cosmic rays, gamma-ray and neutrino.

   hep-phastro-ph.COPLB(2016)·74 citations
5. 05*

   Heavy Pseudoscalar Twist-3 Distribution Amplitudes within QCD Theory in Background Fields

   Tao Zhong🇨🇳 · Xing-Gang Wu🇨🇳 · Tao Huang🇨🇳 · Hai-Bing Fu🇨🇳

   In this paper, we study the properties of the twist-3 distribution amplitude (DA) of the heavy pseudo-scalars such as ${\eta }_c$, $B_c$ and ${\eta }_b$. New sum rules for the twist-3 DA moments ${⟨{\xi }_P^n⟩}_{\mathrm{HP}}$ and ${⟨{\xi }_{\sigma }^n⟩}_{\mathrm{HP}}$ up to sixth orders and up to dimension-six condensates are deduced under the framework of the background field theory. Based on the sum rules for the twist-3 DA moments, we construct a new model for the two twist-3 DAs of the heavy pseudo-scalar with the help of the Brodsky-Huang-Lepage prescription. Furthermore, we apply them to the $B_c\to {\eta }_c$ transition form factor ($f_{+}^{B_c\to {\eta }_c}(q^2)$) within the light-cone sum rules approach, and the results are comparable with other approaches. It has been found that the twist-3 DAs ${\varphi }_{3;{\eta }_c}^P$ and ${\varphi }_{3;{\eta }_c}^{\sigma }$ are important for a reliable prediction of $f_{+}^{B_c\to {\eta }_c}(q^2)$. For example, at the maximum recoil region, we have $f_{+}^{B_c\to {\eta }_c}(0)=0.674\pm 0.066$, in which those two twist-3 terms provide $\sim 33\%$ and $\sim 22\%$ contributions. Also we calculate the branching ratio of the semi-leptonic decay $B_c\to {\eta }_{c}l\nu$ as $Br(B_c\to {\eta }_{c}l\nu )=\left(9.31_{-2.01}^{+2.27}\right)\times 10^{-3}$.

   hep-phEPJC(2016)·14 citations
6. 06*

   Constraints on Sterile Neutrino Oscillations using DUNE Near Detector

   Sandhya Choubey🇮🇳 · Dipyaman Pramanik🇮🇳

   DUNE (Deep Underground Neutrino Experiment) is a proposed long-baseline neutrino experiment in the US with a baseline of 1300 km from Fermi National Accelerator Laboratory (Fermilab) to Sanford Underground Research Facility, which will house a 40 kt Liquid Argon Time Projection Chamber (LArTPC) as the far detector. The experiment will also have a fine grained near detector for accurately measuring the initial fluxes. We show that the energy range of the fluxes and baseline of the DUNE near detector is conducive for observing ${\nu }_{\mu }\to {\nu }_e$ oscillations of $\Delta m^2\sim$ eV${}^2$ scale sterile neutrinos, and hence can be effectively used for testing to very high accuracy the reported oscillation signal seen by the LSND and MiniBooNE experiments. We study the sensitivity of the DUNE near detector to sterile neutrino oscillations by varying the baseline, detector fiducial mass and systematic uncertainties. We find that the detector mass and baseline of the currently proposed near detector at DUNE will be able to test the entire LSND parameter region with good precision. The dependence of sensitivity on baseline and detector mass is seen to give interesting results, while dependence on systematic uncertainties is seen to be small.

   hep-phPLB(2017)·36 citations
7. 07*

   Neutrino Self-Interactions

   Jasper Hasenkamp🇺🇸

   We propose a theory that equips the active neutrinos with interactions among themselves that are at least three orders of magnitude stronger than the weak interaction. We introduce an Abelian gauge group $U(1{)}_x$ with vacuum expectation value $v_x\lesssim \mathcal{O}(100\text{ MeV})$. An asymmetric mass matrix implements the active neutrinos as massless mass eigenstates carrying "effective" charges. To stabilize $v_x$, supersymmetry breaking is mediated via loops to the additional sector with the only exception of xHiggs terms. No Standard Model interaction eigenstate carries $U(1{)}_x$ charge. Thus the dark photon's kinetic mixing is two-loop suppressed.With only simple and generic values of dimensionless parameters, our theory might explain the high-energy neutrino spectrum observed by IceCube including the PeV neutrinos. We comment on the imposing opportunity to incorporate a self-interacting dark matter candidate.

   hep-phPRD(2016)·5 citations
8. 08*

   A Solution to Lithium Problem by Long-Lived Stau

   Joe Sato🇯🇵 · Takashi Shimomura🇯🇵 · Masato Yamanaka🇯🇵

   We review a non-standard Big-Bang nucleosynthesis (BBN) scenario within the minimal supersymmetric standard model, and propose an idea to solve both ${}^7$Li and ${}^6$Li problems. Each problem is a discrepancy between the predicted abundance in the standard BBN and observed one. We focus on the stau, a supersymmetric partner of tau lepton, which is a long-lived charged particle when it is the next lightest supersymmetric particle and is degenerate in mass with the lightest supersymmetric particle. The long-lived stau forms a bound state with a nucleus, and provide non-standard nuclear reactions. One of those, the internal conversion process, accelerates the destruction of ${}^7$Be and ${}^7$Li, and leads to a solution to the ${}^7$Li problem. On the other hand, the bound state of the stau and ${}^4$He enhances productions of n, d, t, and ${}^6$Li. The over-production of ${}^6$Li could solve the ${}^6$Li problem. While, the over-productions of d and t could conflict with observations, and the relevant parameter space of the stau is strictly constrained. We therefore need to carefully investigate the stau-${}^4$He bound state to find a condition of solving the ${}^6$Li problem. The scenario of the long-lived stau simultaneously and successfully fit the abundances of light elements (d, t, ${}^3$He, ${}^4$He, ${}^6$Li, and ${}^7$Li) and the neutralino dark matter to the observed ones. Consequently parameter space both of the stau and the neutralino is determined with excellent accuracy.

   hep-phastro-ph.COIJMPE(2017)·9 citations
9. 09*

   The eLSM at nonzero density

   Francesco Giacosa🇩🇪

   The extended Linear Sigma Model (eLSM) is an effective model of QCD which includes in the mesonic sector (pseudo)scalar and (axial-)vector quarkonia mesons as well as one dilaton/glueball field and in the baryonic sector the nucleon doublet and its chiral partner in the mirror assignment. The chiral partner of the pion turns out to be the resonance $f_0(1370),$ which is then predominantly a quarkonium state. As a consequence, $f_0(500)$ is predominately not a quarkonium state but a four-quark object and is at first not part of the model. Yet, $f_0(500)$ is important in the baryonic sector and affects nuclear matter saturation, the high-density behavior, and nucleon-nucleon scattering. In these proceedings, we show how to enlarge the two-flavour version of the eLSM in order to include the four-quark field $f_0(500)$ in a chiral invariant manner. We then discuss homogeneous and inhomogeneous chiral restoration in a dense medium.

   hep-phnucl-thJ.Phys.Conf.Ser.(2016)·0 citations
10. 10*

    Why there is no crisis of the "spin crisis"

    F. Bradamante🇮🇹 · G.K. Mallot🇨🇭

    In a recent eprint [1] it is argued that the experimental determinations of the spin-dependent structure function g1 have been done incorrectly and that a reanalysis of those data suggests that the original motivation to argue fora "spin crisis", namely the small contribution of quark spins to the nucleon spin, is invalid. In a subsequent note [2] the theoretical understanding, as it has evolved from almost 30 years of theoretical and experimental scrutiny, has been shortly summarised. In this short note, arguments are presented that the line of reasoning in Ref. [1] does not apply, at least not for the Compass data.

    hep-ph0 citations
11. 11*

    Coherent Showers for the LHC

    Nadine Fischer🇦🇺 · Peter Skands🇦🇺

    We present a full-fledged antenna shower for hadron collisions in the Vincia framework and focus on initial state radiation. The current version of the shower is limited to massless QCD partons and colourless resonances. As a proof-of-concept for the applicability of tree-level matrix-element corrections a la GKS we study $Z$ boson production at the LHC, corrected up to Born + $\mathcal{O}({\alpha }_s^2)$, and show some first results with matrix-element corrections.

    hep-phPoS(2016)·1 citation
12. 12*

    Has a Higgs-flavon with a $750$ GeV mass been detected at the LHC13?

    A. Bolaños🇲🇽 · J.L. Diaz-Cruz🇲🇽 · G. Hernández-Tomé🇲🇽 · G. Tavares-Velasco🇲🇽

    Higgs-flavon fields appear as a part of the Froggatt-Nielsen (FN) mechanism, which attempts to explain the hierarchy of Yukawa couplings. We explore the possibility that the 750 GeV diphoton resonance recently reported at the LHC13, could be identified with a low-scale Higgs-flavon field $H_F$ and find the region of the parameter space consistent with CMS and ATLAS data. It is found that the extra vector-like fermions of the ultraviolet completion of the FN mechanism are necessary in order to reproduce the observed signal. We consider a standard model (SM) extension that contains two Higgs doublets (a standard one and an inert one) and one complex FN singlet. The inert doublet includes a stable neutral boson, which provides a viable dark matter candidate, while the mixing of the standard doublet and the FN singlet induces flavor violation in the Higgs sector at the tree-level. Constraints on the parameters of the model are derived from the LHC Higgs data, which include the search for the lepton flavor violating decay of the SM Higgs boson $h\to \bar{\mu }\tau$. It is also found that in some region of the parameter space the model may give rise to a large branching ratio for the $H_F\to hh$ decay, of the order of 0.1, which could be searched for at the LHC.

    hep-phPLB(2016)·14 citations
13. 13*

    Lecture notes on the Skyrme model

    Yong-Liang Ma🇨🇳 · Masayasu Harada🇯🇵

    This lecture provides a pedagogical instruction to the basic concepts of the Skyrme model and its some applications. As the preliminary for understanding the Skyrme model, we first briefly explain the large $N_c$ expansion, chiral symmetry and its breaking. Next we give a brief review of nonlinear sigma model including the power counting scheme of the chiral perturbation theory, starting from the linear sigma model. We then give an exhaust explanation of the Skyrme model and its applications. After the presentation of the Skyrme model for baryons in free space, we introduce how to study the baryonic matter and medium modified hadron properties by using the Skyrme model. Finally we discuss a way to incorporate the lowest-lying vector mesons into the Skyrme model based on the hidden local symmetry. Some possible further developments are also covered.

    hep-ph21 citations
14. 14*

    Polonyi Inflation

    Kai Schmitz🇩🇪 · Tsutomu T. Yanagida🇯🇵

    Spontaneously broken supersymmetry (SUSY) and a vanishingly small cosmological constant imply that R symmetry must be spontaneously broken at low energies. Based on this observation, we suppose that, in the sector responsible for low-energy R symmetry breaking, a discrete R symmetry remains preserved at high energies and only becomes dynamically broken at relatively late times in the cosmological evolution, i.e., after the dynamical breaking of SUSY. Prior to R symmetry breaking, the Universe is then bound to be in a quasi-de Sitter phase---which offers a dynamical explanation for the occurrence of cosmic inflation. This scenario yields a new perspective on the interplay between SUSY breaking and inflation, which neatly fits into the paradigm of high-scale SUSY: inflation is driven by the SUSY-breaking vacuum energy density, while the chiral field responsible for SUSY breaking, the Polonyi field, serves as the inflaton. Because R symmetry is broken only after inflation, slow-roll inflation is not spoiled by otherwise dangerous gravitational corrections in supergravity. We illustrate our idea by means of a concrete example, in which both SUSY and R symmetry are broken by strong gauge dynamics and in which late-time R symmetry breaking is triggered by a small inflaton field value. In this model, the scales of inflation and SUSY breaking are unified; the inflationary predictions are similar to those of F-term hybrid inflation in supergravity; reheating proceeds via gravitino decay at temperatures consistent with thermal leptogenesis; and the sparticle mass spectrum follows from pure gravity mediation. Dark matter consists of thermally produced winos with a mass in the TeV range.

    hep-phastro-ph.COhep-thPRD(2016)·24 citations
15. 15*

    Optimising Charged Higgs Boson Searches at the Large Hadron Collider Across $b\bar{b}{W}^{\pm }$ Final States

    Stefano Moretti🇬🇧 · Rui Santos🇵🇹 · Pankaj Sharma🇦🇺

    In the light of the most recent data from Higgs boson searches and analyses, we re-assess the scope of the Large Hadron Collider in accessing heavy charged Higgs boson signals in $b\bar{b}{W}^{\pm }$ final states, wherein the contributing channels can be $H^{+}\to t\bar{b}$, $h{W}^{\pm },H{W}^{\pm }$ and $A{W}^{\pm }$. We consider a 2-Higgs Doublet Model Type-II and we assume as production mode $bg\to t{H}^{-}$ + c.c., the dominant one over the range $M_{H^{\pm }}\ge 480$ GeV, as dictated by $b\to s\gamma$ constraints. Prospects of detection are found to be significant for various Run 2 energy and luminosity options.

    hep-phPLB(2016)·19 citations
16. 16*

    Fermionic Dark Matter through a Light Pseudoscalar Portal: Hints from the DAMA Results

    Kwei-Chou Yang🇹🇼

    We study the fermionic dark matter (DM) particle interacting with Standard Model quarks via a light pseudoscalar mediator. We consider separately the scenarios for which the DM-pseudoscalar coupling is $CP$ conserving or $CP$ violating. We show that taking a contact interaction is not suitable, even when the mediator has a mass of the same order of magnitude as the typical momentum transfer at the direct-detection experiments, such that the allowed DAMA region is excluded or considerably modified by the correct relic density requirement. The DAMA result seems to indicate that the $CP$-violating interaction is dominant at direct searches. We find that, if the proton-to-neutron effective coupling ratio is $-60\sim -40$, the exclusion limits set by SuperCDMS, XENON100, and LUX are highly suppressed, and the DAMA signal can thus be easily reconciled with these null measurements. For this model, the allowed region determined by the DAMA signal and correct relic density can successfully satisfy the conditions required by the thermal equilibrium, big bang nucleosynthesis, and DM self-interactions. The results of future measurements on flavor physics will provide important constraints on the related models. Precise measurements performed by COUPP, PICASSO, SIMPLE and KIMS should be able to test this model in the near future.

    hep-phastro-ph.COastro-ph.HEPRD(2016)·16 citations
17. 17*

    Equation of state and transition temperatures in the quark-hadron hybrid model

    Akihisa Miyahara🇯🇵 · Yuhei Torigoe🇯🇵 · Hiroaki Kouno🇯🇵 · Masanobu Yahiro🇯🇵

    We analyze the equation of state of 2+1 flavor lattice QCD at zero baryon density by constructing the simple quark-hadron hybrid model that has both quark and hadron components simultaneously. We calculate hadron and quark contribution separately and parameterizing those to match with LQCD data. Lattice data on the equation of state are decomposed into hadron and quark components by using the model. The transition temperature is defined by the temperature at which the hadron component is equal to the quark one in the equation of state. The transition temperature thus obtained is about 215 MeV and somewhat higher than the chiral and the deconfinement pseudocritical temperatures defined by the temperature at which the susceptibility or the absolute value of the derivative of the order parameter with respect to temperature becomes maximum.

    hep-phhep-latnucl-thPRD(2016)·14 citations
18. 18*

    Probing classically conformal $B-L$ model with gravitational waves

    Ryusuke Jinno🇯🇵 · Masahiro Takimoto🇯🇵

    We study the cosmological history of the classical conformal $B-L$ gauge extension of the standard model, in which the physical scales are generated via the Coleman-Weinberg-type symmetry breaking. Especially, we consider the thermal phase transition of the U$(1{)}_{B-L}$ symmetry in the early universe and resulting gravitational-wave production. Due to the classical conformal invariance, the phase transition tends to be a first-order one with ultra-supercooling, which enhances the strength of the produced gravitational waves. We show that, requiring (1) U$(1{)}_{B-L}$ is broken after the reheating, (2) the $B-L$ gauge coupling does not blow up below the Planck scale, (3) the thermal phase transition completes in almost all the patches in the universe, the gravitational wave spectrum can be as large as ${\Omega }_{\mathrm{GW}}\sim 10^{-8}$ at the frequency $f\sim 0.01$-$1$Hz for some model parameters, and a vast parameter region can be tested by future interferometer experiments such as eLISA, LISA, BBO and DECIGO.

    hep-phastro-ph.COgr-qcPRD(2017)·174 citations
19. 19*

    Three-flavor chiral effective model with four baryonic multiplets within the mirror assignment

    L. Olbrich🇩🇪 · M. Zétényi🇭🇺 · F. Giacosa🇩🇪

    We study three-flavor octet baryons by using the so-called extended Linear Sigma Model (eLSM). Within a quark-diquark picture, the requirement of a mirror assignment naturally leads to the consideration of four spin-$\frac{1}{2}$ baryon multiplets. A reduction of the Lagrangian to the two-flavor case leaves four doublets of nucleonic states which mix to form the experimentally observed states $N(939)$, $N(1440)$, $N(1535)$ and $N(1650)$. We determine the parameters of the nucleonic part of the Lagrangian from a fit to masses and decay properties of the aforementioned states. By tracing their masses when chiral symmetry is restored, we conclude that the pairs $N(939)$, $N(1535)$ and $N(1440)$, $N(1650)$ form chiral partners.

    hep-phnucl-thJ.Phys.Conf.Ser.(2016)·0 citations
20. 20*

    Gamma ray signals of the annihilation of Higgs-portal singlet dark matter

    Frederick S. Sage🇨🇦 · Rainer Dick🇨🇦

    This article is an exploration of gamma ray signals of annihilating Higgs-portal singlet scalar and vector dark matter. Gamma ray signals are considered in the context of contributions from annihilations of singlets in the galactic halo to the Isotropic Gamma Ray Background (IGRB), in the context of the Galactic center excess, and in the context of observations of dwarf spheroidal galaxies. We find that Higgs-portal singlets of both species with a mass of  65 GeV can explain the Galactic center excess with reasonable accuracy, but that this mass range is in tension with current direct detection bounds. We also find that singlets in the mass range of 250-1000 GeV are consistent with both the Fermi-LAT IGRB observations and direct detection bounds. Additionally, bounds from gamma ray observations of the dwarf spheroidal galaxy Segue I are translated into bounds on the Higgs-portal couplings.

    ↳ astro-ph.HEastro-ph.COhep-ph18 citations
21. 21*

    Yang-Mills theory on noncommutative space: does it exist?

    Masanori Hanada🇺🇸

    I revisit a basic question about the noncommutative Yang-Mills theory: if it exists or not, or more precisely, whether a nonperturbative formulation exists. As the most promising approach, I consider a formulation based on matrix models. It is explained that the existence of the noncommutative Yang-Mills theory is closely related to the Eguchi-Kawai equivalence. I argue that supersymmetric noncommutative Yang-Mills theory can be defined straightforwardly. Non-supersymmetric theories, such as QCD and pure bosonic theories, can presumably be defined, by modifying the ultraviolet and infrared behaviors appropriately.

    ↳ hep-thhep-lathep-phPoS(2016)·1 citation
22. 22*

    Experimental Status of the CKM Matrix

    Frank C. Porter🇺🇸

    The CKM matrix, V, relates the quark mass and flavor bases. In the standard model, V is unitary 3X3, and specified by four arbitrary parameters, including a phase allowing for $CP$ violation. We review the experimental determination of V, including the four parameters in the standard model context. This is an active field; the precision of experimental measurements and theoretical inputs continues to improve. The consistency of the determination with the standard model unitarity is investigated. While there remain some issues the overall agreement with standard model unitarity is good.

    ↳ hep-exhep-phPPNP(2016)·7 citations
23. 23*

    Does the Peres experiment using photons test for hyper-complex (quaternionic) quantum theories?

    Stephen L. Adler🇺🇸

    Assuming the standard axioms for quaternionic quantum theory and a spatially localized scattering interaction, the $S$-matrix in quaternionic quantum theory is complex valued, not quaternionic. Using the standard connections between the $S$-matrix, the forward scattering amplitude for electromagnetic wave scattering, and the index of refraction, we show that the index of refraction is necessarily complex, not quaternionic. This implies that the recent optical experiment of Procopio et al. based on the Peres proposal does not test for hyper-complex or quaternionic quantum effects arising within the standard Hilbert space framework. Such a test requires looking at near zone fields, not radiation zone fields.

    ↳ quant-phhep-phmath-phmath.MPPRA(2017)·10 citations
24. 24*

    Pseudosingularity in the eigenvalue integral equations

    Jiao-Kai Chen🇨🇳

    The reliability is of the most importance when employing a numerical method to solve the eigenvalue integral equations. In this paper, we present one type of particular singularities (pseudosingularities) existing in eigenvalue integral equations which will impair even destroy the reliability of the numerical solutions in an implicit way. Two odd phenomena emerging in the numerical eigenvalues and the corresponding eigenfunctions are reviewed. And the relations between the pseudosingularities, the odd phenomena and the reliability of the obtained numerical results are discussed.

    ↳ physics.comp-phhep-phphysics.atom-ph0 citations
25. 25*

    Tagging $b$ quarks at extreme energies without tracks

    B. Todd Huffman (1)🇬🇧 · Charles Jackson (1)🇬🇧 · Jeff Tseng (1) ((1) Oxford University)🇬🇧

    We describe a new hit-based $b$-tagging technique for high energy jets and study its performance with a Geant4-based simulation. The technique uses the fact that at sufficiently high energy a B meson or baryon can live long enough to traverse the inner layers of pixel detectors such as those in the ATLAS, ALICE, or CMS experiments prior to decay. By first defining a "jet" via the calorimeter, and then counting hits within that jet between pixel layers at increasing radii, we show it is possible to identify jets that contain $b$-quarks by detecting a jump in the number of hits. We show that the technique maintains its efficiency at energies beyond the range of conventional $b$-taggers.

    ↳ hep-exhep-phJ.Phys.G(2016)·14 citations
26. 26*

    Combined Electroweak and QCD Fit to HERA Data

    I. Abt🇩🇪 · A.M. Cooper-Sarkar🇬🇧 · B. Foster🇬🇧 · C. Gwenlan🇬🇧 · V. Myronenko🇩🇪 · O. Turkot🇩🇪 · K. Wichmann🇩🇪

    A simultaneous Electroweak and QCD fit of electroweak parameters and parton distribution functions to HERA data on deep inelastic scattering is presented. The input data are neutral current and charged current inclusive cross sections measured by the H1 and ZEUS collaborations at the ep collider HERA. The polarisation of the electron beam was taken into account for the ZEUS and H1 data recorded between 2004 and 2007. Results are presented on the vector and axial-vector couplings of the Z boson to u- and d-type quarks. The values are in agreement with Standard Model predictions. The results on a_u and v_u represent the most precise measurements from a single process.

    ↳ hep-exhep-phPRD(2016)·6 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.