Tue·Aug 15, 2017Tuesday·August 15, 2017

1. 01*

   Extra Higgs Boson and $Z^{\prime }$ as Portals to Signatures of Heavy Neutrinos at the LHC

   Elena Accomando🇬🇧 · Luigi Delle Rose🇬🇧 · Stefano Moretti🇬🇧 · Emmanuel Olaiya🇬🇧 · Claire H. Shepherd-Themistocleous🇬🇧

   In this paper, we discuss the potential of observing heavy neutrino (${\nu }_h$) signatures of a $U(1{)}_{B-L}$ enlarged Standard Model (SM) encompassing three heavy Majorana neutrinos alongside the known light neutrino states at the Large Hadron Collider (LHC). We exploit the theoretical decay via a pair of heavy (non-SM-like) Higgs boson and $Z^{\prime }$ production followed by ${\nu }_h\to l^{\pm }{W}^{\mp (\ast )}$ and ${\nu }_h\to {\nu }_l{Z}^{(\ast )}$ decays, ultimately yielding a $3l+2j+E_T^{\mathrm{miss}}$ signature and, depending upon how boosted the final state objects are, we define different possible selections aimed at improving the signal to background ratio in LHC Run 2 data for a wide range of heavy neutrino masses.

   hep-phJHEP(2018)·76 citations
2. 02*

   Birefringence and hidden photons

   Ariel Arza🇨🇱 · Jorge Gamboa🇨🇱

   We study a model where photons interact with hidden photons and millicharged particles through a kinetic mixing term. Particularly, we focus in vacuum birefringence effects and we find a bound for the millicharged parameter assuming that hidden photons are a piece of the local dark matter density

   hep-phhep-thMod.Phys.Lett.A(2018)·2 citations
3. 03*

   Production of tau tau jj final states at the LHC and the TauSpinner algorithm: the spin-2 case

   M. Bahmani🇵🇱 · J. Kalinowski🇵🇱 · W. Kotlarski🇩🇪 · E. Richter-Was🇵🇱 · Z. Was🇵🇱

   The TauSpinner algorithm is a tool that allows to modify the physics model of the Monte Carlo generated samples due to the changed assumptions of event production dynamics, but without the need of re-generating events. With the help of weights $\tau$-lepton production or decay processes can be modified accordingly to a new physics model. In a recent paper a new version TauSpinner ver.2.0.0 has been presented which includes a provision for introducing non-standard states and couplings and study their effects in the vector-boson-fusion processes by exploiting the spin correlations of $\tau$-lepton pair decay products in processes where final states include also two hard jets. In the present paper we document how this can be achieved taking as an example the non-standard spin-2 state that couples to Standard Model particles and tree-level matrix elements with complete helicity information included for the parton-parton scattering amplitudes into a $\tau$-lepton pair and two outgoing partons. This implementation is prepared as the external (user provided) routine for the TauSpinner algorithm. It exploits amplitudes generated by MadGraph5 and adopted to the TauSpinner algorithm format. Consistency tests of the implemented matrix elements, reweighting algorithm and numerical results for observables sensitive to $\tau$ polarization are presented.

   hep-phEPJC(2018)·19 citations
4. 04*

   Heavy glueballs: status and large-$N_c$ width's estimate

   Francesco Giacosa🇩🇪

   Glueballs, an old and firm prediction of various QCD approaches (lattice QCD, bag models, AdS/QCD, effective models, etc.), have not yet been experimentally confirmed. While for glueballs below $2.6$ GeV some candidates exist, the situation for heavy glueballs (above $2.6$ GeV) is cloudy. Here, after a brief review of scalar, tensor, and pseudoscalar glueballs, we present predictions for the decays of a putative pseudotensor glueball with a lattice predicted mass of $3.04$ GeV and a putative vector glueball with a lattice predicted mass of $3.81$ GeV. Moreover, we discuss in general the width of heavy glueballs by using large-$N_c$ arguments: we obtain a rough estimate according to which the width of a glueball (such as the vector one) is about $10$ MeV. Such a width would be narrow enough to enable measurement at the future PANDA experiment.

   hep-phActa Phys.Polon.Supp.(2017)·7 citations
5. 05*

   Mapping the dominant regions of the phase space associated with $c\bar{c}$ production relevant for the Prompt Atmospheric Neutrino Flux

   Victor P. Goncalves🇧🇷 · Rafal Maciula🇵🇱 · Roman Pasechnik🇸🇪 · Antoni Szczurek🇵🇱

   We present a detailed mapping of the dominant kinematical domains contributing to the prompt atmospheric neutrino flux at high neutrino energies by studying its sensitivity to the cuts on several kinematical variables crucial for charm production in cosmic ray scattering in the atmosphere. This includes the maximal center-of-mass energy for proton-proton scattering, the longitudinal momentum fractions of partons in the projectile (cosmic ray) and target (nucleus of the atmosphere), the Feynman $x_F$ variable and the transverse momentum of charm quark/antiquark. We find that the production of neutrinos with energies larger than $E_{\nu }>$ 10${}^7$ GeV is particularly sensitive to the center-of-mass energies larger than the ones at the LHC and to the longitudinal momentum fractions in the projectile 10${}^{-8}$ $<x<$ 10${}^{-5}$. Clearly, these are regions where we do not control the parton, in particular gluon, densities. We also analyse the characteristic theoretical uncertainties in the charm production cross section coming from its QCD modelling. The precision data on the prompt atmospheric neutrino flux can efficiently constrain the mechanism of heavy quark production and underlying QCD dynamics in kinematical ranges beyond the reach of the current collider measurements.

   hep-phastro-ph.HEhep-exPRD(2017)·24 citations
6. 06*

   Flavor Physics and CP Violation

   Paoti Chang🇹🇼 · Kai-Feng Chen🇹🇼 · Wei-Shu Hou🇹🇼

   We currently live in the age of the CKM paradigm. The $3\times 3$ matrix that links $(d,s,b)$ quarks to $(u,c,t)$ in the charged current weak interaction, being complex and nominally with 18 parameters, can be accounted for by just 3 rotation angles and one $CP$ violating (CPV) phase, with unitarity and the CKM phases triumphantly tested at the B factories. But the CKM picture is unsatisfactory and has too many parameters. The main aim of Flavor Physics and $CP$ violation (FPCP) studies is the pursuit to uncover New Physics beyond the Standard Model (SM). Two highlights of LHC Run~1 period are the CPV phase ${\varphi }_s$ of $B_s$ mixing and $B_s\to {\mu }^{+}{\mu }^{-}$ decay, which were found to be again consistent with SM, though the saga is yet unfinished. We also saw the emergence of the $P_5^{\prime }$ angular variable anomaly in $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay and $R_{K^{(\ast )}}$ anomaly in $B\to K^{(\ast )}{\mu }^{+}{\mu }^{-}$ to $B\to K^{(\ast )}{e}^{+}{e}^{-}$ rate ratios, and the BaBar anomaly in $B\to D^{(\ast )}\tau \nu$ decays, which suggest possible New Physics in these flavor processes, pointing to extra $Z^{\prime }$, charged Higgs, or leptoquarks. Charmless hadronic, semileptonic, purely leptonic and radiative $B$ decays continue to offer various further windows on New Physics. Away from $B$ physics, the rare $K\to \pi \nu \nu$ decays and ${\epsilon }^{\prime }/\epsilon$ in the kaon sector, $\mu \to e$ transitions, muon $g-2$ and electric dipole moments of the neutron and electron, $\tau \to \mu \gamma ,\mu \mu \mu ,eee$, and a few charm physics probes, offer broadband frontier windows on New Physics. (See the document for the full abstract.)

   hep-phhep-exPPNP(2017)·26 citations
7. 07*

   Binding Energies and Dissociation Temperatures of Heavy Quarkonia at Finite Temperature and Chemical Potential in the N-dimensional space

   M. Abu-Shady🇪🇬 · T. A. Abdel-Karim🇪🇬 · E. M. Khokha🇪🇬

   The N-dimensional radial Schrödinger equation has been solved using the analytical exact iteration method (AEIM), in which the Cornell potential is generalized to finite temperature and chemical potential. The energy eigenvalues have been calculated in the N-dimensional space for any state (n, l). The present results have been applied for studying quarkonium properties such as charmonium and bottomonium masses. The binding energies and the mass spectra of heavy quarkonia are studied in the N-dimensional space. The dissociation temperatures for different states of heavy quarkonia are calculated in the three dimensional space. The influence of dimensionality number (N) has been discussed on the dissociation temperatures. A comparison is studied with other recent works. We conclude that the AEIM successes to predict the heavy-quarkonium properties at finite temperature and chemical potential.

   hep-phAdv.High Energy Phys.(2018)·25 citations
8. 08*

   TASI Lectures on Scattering Amplitudes

   Clifford Cheung🇺🇸

   These lectures are a brief introduction to scattering amplitudes. We begin with a review of basic kinematical concepts like the spinor helicity formalism, followed by a tutorial on bootstrapping tree-level scattering amplitudes. Afterwards, we discuss on-shell recursion relations and soft theorems, emphasizing their broad applicability to gravity, gauge theory, and effective field theories. Lastly, we report on some of the new field theoretic structures which have emerged from the on-shell picture, focusing primarily on color-kinematics duality.

   hep-phhep-th189 citations
9. 09*

   Lower Mass Bound on the $W^{\prime }$ mass via Neutrinoless Double Beta Decay in a 3-3-1 Model

   A.C.O. Santos🇧🇷 · P. Vasconcelos🇧🇷

   The discovery of neutrino masses has raised the importance of studies in the context of neutrinoless double beta decay, which constitutes a landmark for lepton number violation. The standard interpretation is that the light massive neutrinos, that we observed oscillating in terrestrial experiments, mediate double beta decay. In the minimal 3-3-1 model, object of our study, there is an additional contribution that stems from the mixing between a new charged vector boson, $W^{\prime }$, and the Standard Model W boson. Even after setting this mixing to be very small, we show that tight constraints arise from the non-observation of neutrinoless double beta decay. Indeed, we derive bounds on the mass of the $W^{\prime }$ gauge boson that might exceed those from collider probes, and most importantly push the scale of symmetry breaking beyond its validity, leading to the exclusion of the minimal 3-3-1 model.

   hep-phAdv.High Energy Phys.(2018)·14 citations
10. 10*

    Non-Standard Heavy Mesons and Baryons, an Experimental Review

    Stephen Lars Olsen🇰🇷 · Tomasz Skwarnicki🇺🇸 · Daria Zieminska🇺🇸

    Quantum Chromodynamics (QCD), the generally accepted theory for the strong interactions, describes the interactions between quarks and gluons. The strongly interacting particles that are seen in nature are hadrons, which are composites of quarks and gluons. Since QCD is a strongly coupled theory at distance scales that are characteristic of observable hadrons, there are no rigorous, first-principle methods to derive the spectrum and properties of the hadrons from the QCD Lagrangian, except for Lattice QCD simulations that are not yet able to cope with all aspects of complex and short-lived states. Instead, a variety of "QCD inspired" phenomenological models have been proposed. Common features of these models are predictions for the existence of hadrons with substructures that are more complex than the standard quark-antiquark mesons and the three quark baryons of the original quark model that provides a concise description of most of the low-mass hadrons. Recently, an assortment of candidates for non-standard multi-quark mesons, meson-gluon hybrids and pentaquark baryons that contain heavy (charm or bottom) quarks have been discovered. Here we review the experimental evidence for these states and make some general comparisons of their measured properties with standard quark-model expectations and predictions of various models for non-standard hadrons. We conclude that the spectroscopy of all but simplest hadrons is not yet understood.

    hep-phRMP(2018)·962 citations
11. 11*

    Relativistic hydrodynamics of particles with spin 1/2

    Wojciech Florkowski🇵🇱 · Bengt Friman🇩🇪 · Amaresh Jaiswal🇮🇳 · Enrico Speranza🇩🇪

    A new hydrodynamic framework for particles with spin 1/2, based solely on the conservation laws for charge, energy, momentum and angular momentum, is discussed.

    hep-phActa Phys.Polon.Supp.(2017)·8 citations
12. 12*

    Inclusive Higgs boson production at the LHC in the kt-factorization approach

    N.A. Abdulov🇷🇺 · A.V. Lipatov🇷🇺 · M.A. Malyshev🇷🇺

    We investigate the inclusive Higgs boson production in proton-proton collisions at the CERN LHC conditions using the $k_T$-factorization approach. Our analysis is based on the dominant off-shell gluon-gluon fusion subprocess (where the transverse momenta of initial gluons are taken into account) and covers $H\to \gamma \gamma$, $H\to Z{Z}^{\ast }\to 4l$ (where $l=e,\mu$) and $H\to W^{+}{W}^{-}\to e^{\pm }{\mu }^{\mp }\nu \bar{\nu }$ decay channels. The transverse momentum dependent (or unintegrated) gluon densities in a proton were derived from Ciafaloni-Catani-Fiorani-Marchesini equation or, alternatively, were chosen in accordance with Kimber-Martin-Ryskin prescription. We estimate the theoretical uncertainties of our calculations and compare our results with next-to-next-to-leading-order plus next-to-next-to-leading-logarithmic ones obtained using collinear QCD factorization. Our predictions agree well with the latest experimental data taken by the CMS and ATLAS Collaborations at $\sqrt{s}=8$ and $13$~TeV.

    hep-phPRD(2018)·15 citations
13. 13*

    Constraint on the branching ratio of B_c \to tau nu from LEP1 and consequences for R(D(*)) anomaly

    A.G. Akeroyd🇬🇧 · Chuan-Hung Chen🇹🇼

    Recently there has been interest in the correlation between R(D*) and the branching ratio (BR) of $B_c\to \tau \nu$ in models with a charged scalar H^\pm. Any enhancement of R(D*) by $H^{\pm }$ alone (in order to agree with current data) also enhances $BR(B_c\to \tau \nu$), for which there has been no direct search at hadron colliders. We show that LEP data taken at the Z peak requires BR($B_c\to \tau \nu$) < 10%, and this constraint is significantly stronger than the recent constraint BR($B_c\to \tau \nu$) < 30% from considering the lifetime of B_c. In order to respect this new constraint, any explanation of the R(D) and R(D*) anomaly in terms of $H^{\pm }$ alone would require the future measurements of R(D*) to be even closer to the Standard Model prediction. A stronger limit on BR($B_c\to \tau \nu$) (or its first measurement) would be obtained if the L3 collaboration used all its data taken at the Z peak.

    hep-phPRD(2017)·172 citations
14. 14*

    Energy-energy correlation in electron-positron annihilation at NNLL+NNLO accuracy

    Zoltán Tulipánt🇭🇺 · Adam Kardos🇭🇺 · Gábor Somogyi🇭🇺

    We present the computation of energy-energy correlation in $e^{+}{e}^{-}$ collisions in the back-to-back region at next-to-next-to-leading logarithmic accuracy matched with the next-to-next-to-leading order perturbative prediction. We study the effect of the fixed higher order corrections in a comparison of our results to LEP and SLC data. The next-to-next-to-leading order correction has a sizable impact on the extracted value of ${\alpha }_{\mathrm{S}}(M_Z)$, hence its inclusion is mandatory for a precise measurement of the strong coupling using energy-energy correlation.

    hep-phEPJC(2017)·106 citations
15. 15*

    Prediction of exotic doubly charmed baryons within chiral effective field theory

    Zhi-Hui Guo🇨🇳

    In this work we study the possible QCD exotic states in the doubly charmed baryon sector. Within chiral effective theory, it is predicted that several excited baryons result from the $S$-wave scattering of ground-state doubly charmed baryons (${\Xi }_{cc}^{++},{\Xi }_{cc}^{+},{\Omega }_{cc}^{+}$) and light pseudoscalar mesons ($\pi ,K,\eta$). The excited doubly charmed baryons can be classified by the strangeness ($S$) and isospin ($I$) quantum numbers. Two of the excited states are clearly exotic, in the sense that they cannot be explained by the conventional baryons with three quarks, since their quantum numbers are $(S,I)=(1,0)$ and $(-1,1)$. Similar to the charmed scalar meson $D_{s0}^{\ast }(2317)$ in $DK$ scattering and the hyperon $\Lambda (1405)$ in $\bar{K}N$ scattering, one bound state below the ${\Xi }_{cc}\bar{K}$ threshold is predicted in the $(S,I)=(-1,0)$ channel. In addition, two resonant structures are found in the ${\Xi }_{cc}\pi ,{\Xi }_{cc}\eta$ and ${\Omega }_{cc}K$ coupled-channel scattering with $(S,I)=(0,1/2)$. The corresponding pole positions and coupling strengths of the excited doubly charmed baryons are given. The scattering lengths of the ground-state doubly charmed baryons and light pseudoscalar mesons are also predicted. The current study may provide useful guides for future experimental measurements and lattice simulations.

    hep-phhep-exhep-latnucl-thPRD(2017)·59 citations
16. 16*

    From high-scale leptogenesis to low-scale one-loop neutrino mass generation

    Hang Zhou🇨🇳 · Pei-Hong Gu🇨🇳

    We show that a high-scale leptogenesis can be consistent with a low-scale one-loop neutrino mass generation. Our models are based on the SU(3)_c\times SU(2)_L\times U(1)_Y\times U(1)_{B-L} gauge groups. Except a complex singlet scalar for the U(1)_{B-L} symmetry breaking, the other new scalars and fermions (one scalar doublet, two or more real scalar singlets/triplets and three right-handed neutrinos) are odd under an unbroken Z_2 discrete symmetry. The real scalar decays can produce an asymmetry stored in the new scalar doublet which subsequently decays into the standard model lepton doublets and the right-handed neutrinos. The lepton asymmetry in the standard model leptons then can be partially converted to a baryon asymmetry by the sphaleron processes. By integrating out the heavy scalar singlets/triplets, we can realize an effective theory to radiatively generate the small neutrino masses at the TeV scale. Furthermore, the lightest right-handed neutrino can serve as a dark matter candidate.

    hep-phNPB(2018)·6 citations
17. 17*

    Renormalization Mass Scale and Scheme Dependence in the Perturbative Contribution to Inclusive Semileptonic $b$ Decays

    F.A. Chishtie🇨🇦 · D.G.C. McKeon🇨🇦 · T.N. Sherry🇮🇪

    We examine the perturbative calculation of the inclusive semi-leptonic decay rate $\Gamma$ for the $b$-quark, using mass-independent renormalization. To finite order of perturbation theory the series for $\Gamma$ will depend on the unphysical renormalization scale parameter $\mu$ and on the particular choice of mass-independent renormalization scheme; these dependencies will only be removed after summing the series to all orders. In this paper we show that all explicit $\mu$-dependence of $\Gamma$, through powers of ln$(\mu )$, can be summed by using the renormalization group equation. We then find that this explicit $\mu$-dependence can be combined together with the implicit $\mu$-dependence of $\Gamma$ (through powers of both the running coupling $a(\mu )$ and the running $b$-quark mass $m(\mu )$) to yield a $\mu$-independent perturbative expansion for $\Gamma$ in terms of $a(\mu )$ and $m(\mu )$ both evaluated at a renormalization scheme independent mass scale $IM$ which is fixed in terms of either the "$\overline{MS}$ mass" ${\overline{m}}_b$ of the $b$ quark or its pole mass $m_{pole}$. At finite order the resulting perturbative expansion retains a degree of arbitrariness associated with the particular choice of mass-independent renormalization scheme. We use the coefficients $c_i$ and $g_i$ of the perturbative expansions of the renormalization group functions $\beta (a)$ and $\gamma (a)$, associated with $a(\mu )$ and $m(\mu )$ respectively, to characterize the remaining renormalization scheme arbitrariness of $\Gamma$. We further show that all terms in the expansion of $\Gamma$ can be written in terms of the $c_i$ and $g_i$ coefficients and a set of renormalization scheme independent parameters ${\tau }_i$.

    hep-phCan.J.Phys.(2021)·9 citations
18. 18*

    Revisiting simplified dark matter models in terms of AMS-02 and Fermi-LAT

    Tong Li🇦🇺

    We perform an analysis of the simplified dark matter models in the light of cosmic ray observables by AMS-02 and Fermi-LAT. We assume fermion, scalar or vector dark matter particle with a leptophobic spin-0 mediator that couples only to Standard Model quarks and dark matter via scalar and/or pseudo-scalar bilinear. The propagation and injection parameters of cosmic rays are determined by the observed fluxes of nuclei from AMS-02. We find that the AMS-02 observations are consistent with the dark matter framework within the uncertainties. The AMS-02 antiproton data prefer 30 (50) GeV - 5 TeV dark matter mass and require an effective annihilation cross section in the region of 4x10^{-27} (7x10^{-27}) - 4x10^{-24} cm^3/s for the simplified fermion (scalar and vector) dark matter models. The cross sections below 2x10^{-26} cm^3/s can evade the constraint from Fermi-LAT dwarf galaxies for about 100 GeV dark matter mass.

    hep-phJHEP(2018)·8 citations
19. 19*

    Analysis of the axialvector doubly heavy tetraquark states with QCD sum rules

    Zhi-Gang Wang🇨🇳

    In this article, we construct the axialvector-diquark-scalar-antidiquark type currents to interpolate the axialvector doubly heavy tetraquark states, and study them with the QCD sum rules in details by carrying out the operator product expansion up to the vacuum condensates of dimension 10.

    hep-phActa Phys.Polon.B(2018)·64 citations
20. 20*

    Thermodynamics of strongly interacting matter in a hybrid model

    Abhijit Bhattacharyya🇮🇳 · Sanjay K. Ghosh🇮🇳 · Soumitra Maity🇮🇳 · Sibaji Raha🇮🇳 · Rajarshi Ray🇮🇳 · Kinkar Saha🇮🇳 · Subhasis Samanta🇮🇳 · Sudipa Upadhaya🇮🇳

    The equation of state and fluctuations of conserved charges in a strongly interacting medium under equilibrium conditions form the baseline upon which various possible scenarios in relativistic heavy-ion collision experiments are built. Many of these quantities have been obtained in the lattice QCD framework with reliable continuum extrapolations. Recently the Polyakov$-$Nambu$-$Jona-Lasinio model has been reparametrized to some extent to reproduce quantitatively the lattice QCD equation of state at vanishing chemical potentials. The agreement was precise except at low temperatures, possibly due to inadequate representation of the hadronic degrees of freedom in the model. This disagreement was also observed for some of the fluctuation and correlations considered. Here we address this issue by introducing the effects of hadrons through the Hadron Resonance Gas model. The total thermodynamic potential is now a weighted sum of the thermodynamic potential of the Polyakov$-$Nambu$-$Jona-Lasinio model and that of the Hadron Resonance Gas model. We find that the equation of state and the fluctuations and correlations obtained in this hybrid model agrees satisfactorily with the lattice QCD data in the low temperature regime.

    hep-phPRC(2019)·25 citations
21. 21*

    Dynamical evolution of the spectator systems produced in ultra-relativistic heavy-ion collisions

    K. Mazurek🇵🇱 · A. Szczurek🇵🇱 · C. Schmitt🇫🇷 · P.N. Nadtochy🇷🇺

    In peripheral heavy-ion collisions at ultra-relativistic energies, usually only parts of the colliding nuclei effectively interact with each other. In the overlapping zone, a fireball or quark-gluon plasma is produced. The excitation energy of the heavy remnant can range from a few tens to several hundreds of MeV, depending on the impact parameter. The decay of these excited spectators is investigated in this work for the first time within a dynamical approach based on the multi-dimensional stochastic Langevin equation. The potential of this exploratory work to understand the connection between electromagnetic fields generated by the heavy spectators and measured pion distributions is discussed.

    ↳ nucl-thhep-phPRC(2018)·16 citations
22. 22*

    Continuum limit of hyperon vector coupling $f_1(0)$ from 2+1 flavor domain wall QCD

    Shoichi Sasaki🇯🇵

    We determine the hyperon vector couplings $f_1(0)$ for ${\Sigma }^{-}\to n{l}^{-}\overline{{\nu }_l}$ and ${\Xi }^0\to {\Sigma }^{+}{l}^{-}\overline{{\nu }_l}$ semileptonic decays in the continuum limit with (2+1)-flavors of dynamical domain-wall fermions, using the Iwasaki gauge action at two different lattice spacings of $a$=0.114(2) and 0.086(2) fm. A theoretical estimation of flavor SU(3)-breaking effect on the vector coupling is required to extract $V_{us}$ from the experimental rate of hyperon beta decays. We obtain the vector couplings $f_1(0)$ for $\Sigma \to N$ and $\Xi \to \Sigma$ beta-decays with an accuracy of less than one percent. We then find that lattice results of $f_1(0)$ combined with the best estimate of $|V_{us}|$ with imposing Cabibbo-Kobayashi-Maskawa (CKM) unitarity are slightly deviated from the experimental result of $|V_{us}{f}_1(0)|$ for the $\Sigma \to N$ beta-decay. This discrepancy can be attributed to an assumption made in the experimental analysis on $|V_{us}{f}_1(0)|$, where the induced second-class form factor $g_2$ is set to be zero regardless of broken SU(3) symmetry. We report on this matter and then estimate the possible value of $g_2(0)$, which is evaluated from the experimental decay rate with our lattice result of $f_1(0)$ under the first-row CKM-unitarity condition.

    ↳ hep-lathep-phPRD(2017)·21 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.