Mon·Sep 3, 2018Monday·September 3, 2018

1. 01*

   Thermal dissociation of heavy mesons and configurational entropy

   Nelson R. F. Braga🇧🇷 · Luiz F. Ferreira🇧🇷 · Roldao da Rocha🇧🇷

   We study the dissociation of heavy vector mesons in a thermal medium from the point of view of the configurational entropy. Bottomonium and charmonium vector mesons in a plasma are represented using a holographic AdS/QCD model. The quasinormal modes, describing the quasiparticle states, are determined for a representative range of temperature and the corresponding CE is then computed. The main result indicates that the CE is an important contrivance to investigate the stability of the heavy mesons against dissociation in the thermal medium.

   hep-phhep-thPLB(2018)·61 citations
2. 02*

   Addressing the Majorana vs. Dirac Question with Neutrino Decays

   A. Baha Balantekin🇺🇸 · André de Gouvêa🇺🇸 · Boris Kayser🇺🇸

   The Majorana versus Dirac nature of neutrinos remains an open question. This is due, in part, to the fact that virtually all the experimentally accessible neutrinos are ultra-relativistic. Noting that Majorana neutrinos can behave quite differently from Dirac ones when they are non-relativistic, we show that, at leading order, the angular distribution of the daughters in the decay of a heavy neutrino into a lighter one and a self-conjugate boson is isotropic in the parent's rest frame if the neutrinos are Majorana, independent of the parent's polarization. If the neutrinos are Dirac fermions, this is, in general, not the case. This result follows from CPT invariance and is independent of the details of the physics responsible for the decay. We explore the feasibility of using these angular distributions -- or, equivalently, the energy distributions of the daughters in the laboratory frame -- in order to address the Majorana versus Dirac nature of neutrinos if a fourth, heavier neutrino mass eigenstate reveals itself in the current or next-generation of high-energy colliders, intense meson facilities, or neutrino beam experiments.

   hep-phhep-exnucl-thPLB(2019)·93 citations
3. 03*

   A Note on Pretzelosity TMD Parton Distribution

   X.P. Chai🇨🇳 · K.B. Chen🇨🇳 · J.P. Ma🇨🇳

   We show that the transverse-momentum-dependent parton distribution, called as Pretzelosity function, is zero at any order in perturbation theory of QCD for a single massless quark state. This implies that Pretzelosity function is not factorized with the collinear transversity parton distribution at twist-2, when the struck quark has a large transverse momentum. Pretzelosity function is in fact related to collinear parton distributions defined with twist-4 operators. In reality, Pretzelosity function of a hadron as a bound state of quarks and gluons is not zero. Through an explicit calculation of Pretzelosity function of a quark combined with a gluon nonzero result is found.

   hep-phhep-exPLB(2019)·6 citations
4. 04*

   Single Spin Asymmetry in transverse polarized proton production and lambda production in Semi-Inclusive DIS at twist-3

   Yongliang Yang🇨🇳 · Wenjuan Mao🇨🇳 · Zhun Lu🇨🇳

   We study the single spin asymmetry in the transversely polarized proton production and the lambda hyperon production in semi-inclusive deep inelastic scattering with a $\sin {\varphi }_{S_h}$ modulation, in which $S_h$ is the azimuthal angle of the transverse spin of the final hadron. The theoretical interpretation for the asymmetry is presented as the convolution of the twist-3 quark transverse momentum dependent distributions and twist-2 fragmentation functions. We investigate the role of the twist-3 distribution functions $h(x,p_T^2)$, $f^{\perp }(x,p_T^2)$ and $g^{\perp }(x,p_T^2)$ and the twist-2 fragmentation functions $H_1(x,k_T^2)$, $D_{1T}^{\perp }(x,k_T^2)$ and $G_{1T}(x,k_T^2)$ in this asymmetry. Using spectator model, we compute these distribution and fragmentation functions and estimate the $\sin {\varphi }_{S_h}$ asymmetry for the proton production as well as for the lambda production at JLab with a 12 $\mathrm{GeV}$ electron beam. The asymmetry at the COMPASS kinematics is also predicted. By comparing different sources for the asymmetry, we conclude that it is feasible to access the distribution function $h$ and the fragmentation function $H_1$ through measuring the asymmetry in the proton production, whereas the $f^{\perp }{D}_{1T}^{\perp }$ term might be probed in the lambda production at JLab 12 GeV.

   hep-phEur.Phys.J.Plus(2019)·5 citations
5. 05*

   The study of gluon energy loss in cold nuclear matter from $J/\psi$ production

   Li-Hua Song🇨🇳 · Lin-Wan Yan🇨🇳 · Shang-Fei Xin🇨🇳

   The energy loss effects of the incident quark, gluon and the color octet $c\bar{c}$ on $J/\psi$ suppression in p-A collisions are studied by means of the experimental data at E866, RHIC and LHC energy. By the Salgado-Wiedemann (SW) quenching weights and the recent EPPS16 nuclear parton distribution functions together with nCTEQ15, we extract the transport coefficient for the gluon energy loss from the E866 experimental data in the middle $x_F$ region ($0.20<x_F<0.65$). It is found that the difference between the values of the transport coefficient for light quark, gluon and heavy quark in the cold nuclear matter is very small. The theoretical results modified by the parton energy loss effects are consistent with the experimental data for E866 and RHIC energy, and the gluon energy loss plays a remarkable role on $J/\psi$ suppression in a broad variable range. Since the corrections of the nuclear parton distribution functions in the $J/\psi$ channel are significant at LHC energy, the nuclear modification due to the parton energy loss is minimal. It is worth noting that we use CEM at leading order to compute the p-p baseline, and the conclusion in this paper is CEM model dependent.

   hep-phCPC(2018)·1 citation
6. 06*

   Electric Dipole Moments from Post-Sphaleron Baryogenesis

   Nicole F. Bell🇦🇺 · Tyler Corbett🇦🇺 · Michael Nee🇦🇺 · Michael J. Ramsey-Musolf🇺🇸

   We consider a model in which baryogenesis occurs at low scale, at a temperature below the electroweak phase transition. This model involves new diquark-type scalars which carry baryon number. Baryon number violation is introduced in the scalar potential, permitting $\Delta B=2$ violating process involving Standard Model quarks while avoiding stringent proton decay constraints. Depending on their quantum number assignment, the diquark-type scalars can couple to either right or left handed quarks, or to both. We show that this model can provide a viable explanation of the baryon asymmetry of the universe provided that the coupling to left handed quarks are present. However, the coexistence of couplings to left and right handed quarks introduces important phenomenological constraints on the model, such as radiative contributions to quark masses and the generation of electric dipole moments for nuclei, which probe the CP even and CP odd products of the relevant couplings constants, respectively. We demonstrate that the strongest such constraints arise from electric dipole moment measurements of the neutron and ${}^{199}$Hg. These constraints are sufficiently strong that, in the absence of an intricate flavor structure, baryogenesis must be dominated by the couplings of the new scalars to left handed quarks.

   hep-phPRD(2019)·11 citations
7. 07*

   Neutrino phenomenology of a high scale supersymmetry model

   Ying-Ke Lei🇨🇳 · Chun Liu🇨🇳

   CP violation in the lepton sector, and other aspects of neutrino physics, are studied within a high scale supersymmetry model. In addition to the sneutrino vacuum expectation values (VEVs), the heavy vector-like triplet also contributes to neutrino masses. Phases of the VEVs of relevant fields, complex couplings and Zino mass are considered. The approximate degeneracy of neutrino masses $m_{{\nu }_1}$ and $m_{{\nu }_2}$ can be naturally understood. The neutrino masses are then normal ordered, $\sim$ 0.020 eV, 0.022 eV, and 0.054 eV. Large CP violation in neutrino oscillations is favored. The effective Majorana mass of the electron neutrino is about 0.02 eV.

   hep-phhep-exCommun.Theor.Phys.(2019)·2 citations
8. 08*

   Nucleon - Light Dark Matter Annihilation through Baryon Number Violation

   Mingjie Jin🇨🇳 · Yu Gao🇨🇳

   Dark matter that participates in baryon-number violating interactions can annihilate with baryons if the dark matter particle is not protected under discrete symmetries. In this paper we investigate the dark matter - baryon annihilation in color-triplet extensions of the Standard Model, in which a fermionic dark matter can be kinematically stable within a small mass range near the proton mass. We demonstrate that the DM's annihilation with nucleons can be probed to stringent limits at large-volume water Cherenkov detectors like the Super-Kamionkonde experiment, with the mediator scale $m_{\Phi }$ constrained up to $10^7$ GeV. In case of a Majorana light dark matter, this constraint is weaker yet close in magnitude to that from neutron-antineutron oscillation. In the Dirac DM case, the dark matter- nucleon annihilation gives much stronger bounds than that from the uncertainties of the neutron decay lifetime. In a limited range of the DM mass above $m_p+m_e$, the DM-nucleon annihilation bound can be higher than the requirement from the DM's stability in the Universe. Given the strong limits from Super-Kamionkonde, we find it below the current experimental capabilities to indirectly detecting the dark matter- nucleon annihilation signal in diffuse Galactic gamma rays and neutron star heating.

   hep-phPRD(2018)·21 citations
9. 09*

   The $B\to \rho$ helicity form factors within the QCD light-cone sum rules

   Wei Cheng🇨🇳 · Xing-Gang Wu🇨🇳 · Rui-Yu Zhou🇨🇳 · Hai-Bing Fu🇨🇳

   We study the $B\to \rho$ helicity form factors (HFFs) by applying the light-cone sum rules up to twist-4 accuracy. The HFF has some advantages in comparison to the conventionally calculated transition form factors, such as the HFF parameterization can be achieved via diagonalizable unitarity relations and etc. At the large recoil point, only the $\rho$-meson longitudinal component contributes to the HFFs, and we have ${\mathcal{H}}_{\rho ,0}(0)=0.435_{-0.045}^{+0.055}$ and ${\mathcal{H}}_{\rho ,\{1,2\}}(0)\equiv 0$. We extrapolate the HFFs to physically allowable $q^2$-region and apply them to the $B\to \rho$ semileptonic decay. We observe that the $\rho$-meson longitudinal component dominates its differential decay width in low $q^2$-region, and its transverse component dominates the high $q^2$-region. Two ratios $R_{\mathrm{low}}$ and $R_{\mathrm{high}}$ are used to characterize those properties, and our LCSR calculation gives, $R_{\mathrm{low}}=0.967_{-0.284}^{+0.305}$ and $R_{\mathrm{high}}=0.219_{-0.070}^{+0.058}$, which agree with the BaBar measurements within errors.

   hep-phPRD(2018)·11 citations
10. 10*

    Accessing gluon parton distributions in large momentum effective theory

    Jian-Hui Zhang🇩🇪 · Xiangdong Ji🇺🇸 · Andreas Schäfer🇩🇪 · Wei Wang🇨🇳 · Shuai Zhao🇨🇳

    Gluon parton distribution functions (PDFs) in the proton can be calculated directly on Euclidean lattices using large momentum effective theory (LaMET). To realize this goal, one has to find renormalized gluon quasi-PDFs in which power divergences and operator mixing are thoroughly understood. For the unpolarized distribution, we identify four independent quasi-PDF correlators that can be multiplicatively renormalized on the lattice. Similarly, the helicity distribution can be derived from three independent multiplicatively renormalizable quasi-PDFs. We provide a LaMET factorization formula for these renormalized quasi-PDFs from which one can extract the gluon PDFs.

    hep-phhep-exhep-latnucl-ex+1PRL(2019)·122 citations
11. 11*

    Model independent investigation of the $R_{J/\psi ,{\eta }_c}$ and ratios of decay widths of semileptonic $B_c$ decays into a P-wave charmonium

    Wei Wang🇨🇳 · Ruilin Zhu🇨🇳

    Experimental measurements of decay branching fractions of semitaunic and semimuonic $B_c$ into $J/\psi$ has challenged the lepton flavor universality in standard model with about two standard deviations. In this paper, we first investigate the unitary constraint on form factors of $B_c$ meson into $S$-wave and $P$-wave charmonium. Such constraint leads to the exploration of the $R_{J/\psi }$ and other ratios $R_{{\eta }_c}$, $R_{h_c}$, and $R_{{\chi }_{cJ}}$ in a model-independent way. These results together with future experimental measurements can be used to explore the lepton flavor universality in a more systematic way. In addition, we point out that the helicity-dependent ratios $R_{J/\psi }^L$ and $R_{J/\psi }^{\perp }$ can also provide complementary information.

    hep-phhep-exInt.J.Mod.Phys.A(2019)·44 citations
12. 12*

    Parameter space of baryogenesis in the $\nu$MSM

    Shintaro Eijima🇳🇱 · Mikhail Shaposhnikov🇨🇭 · Inar Timiryasov🇨🇭

    The Standard Model accompanied with two right-handed neutrinos with the masses below the weak scale can explain the observed baryon asymmetry of the Universe. Moreover, this model is at least partially testable in the forthcoming experiments such as NA62, SHiP, and MATHUSLA. The remarkable progress in understanding of various rates entering the kinetic equations describing the asymmetry generation along with considerable improvements of the numerical procedures allow us to perform a comprehensive analysis of the parameter space of the model. We find that the region of parameters leading to the successful baryogenesis is notably larger than it was previously obtained. Our results are presented in a way that they can be readily used for studies of sensitivity of various experiments searching for the right-handed neutrinos responsible for the baryon asymmetry of the Universe. We also present a detailed comparison with the studies by other groups.

    hep-phhep-exJHEP(2019)·60 citations
13. 13*

    Solving the muon g-2 anomaly in CMSSM extension with non-universal gaugino masses

    Fei Wang🇨🇳 · Kun Wang🇨🇳 · Jin Min Yang🇨🇳 · Jingya Zhu🇨🇳

    We propose to generate non-universal gaugino masses in SU(5) GUT with the generalized Planck-scale mediation SUSY breaking mechanism, in which the non-universality arises from proper wavefunction normalization with lowest component VEVs of various high dimensional representations of the Higgs fields of SU(5) and an unique F-term VEV by the singlet. Different predictions on gaugino mass ratios with respect to widely studied scenarios are given. The gluino-SUGRA-like scenario, where gluinos are much heavier than winos, bino and universal scalar masses, can be easily realized with appropriate combinations of such high-representation Higgs fields. With 6 GUT-scale parameters in our scenario, we can solve elegantly the tension between mSUGRA and the present experimental results, including the muon g-2, the dark matter (DM) relic density and the direct sparticle search bounds from the LHC. Taking into account the current constraints in our numerical scan, we have the following observations: (i) The large-$\tan \beta$ samples with a moderate $M_3$ a small $|A_0/M_3|$ and a small $m_A$ are favored to generate a 125 GeV SM-like Higgs and predict a large muon g-2, while the stop mass and \mu parameter, mainly determined by $|M_3|(\gg M_0,|M_1|,|M_2|)$, can be about 6 TeV; (ii) The moderate-$\tan \beta$(35~40) samples with a negative $M_3$ can have a light smuon but a heavy stau, which predict a large muon g-2 but a small $Br(B_s\to {\mu }^{+}{\mu }^{-})$; (iii) To obtain the right DM relic density, the annihilation mechanisms should be stau exchange, stau coannihilation, chargino coannihilation, slepton annihilation and the combination of two or three of them; (iv) To obtain the right DM relic density, the spin-independent DM-nucleon cross section is typically much smaller than the present limits of XENON1T 2018 and also an order of magnitude lower than the future detection sensitivity of LZ and XENONnT.

    hep-phhep-exJHEP(2018)·36 citations
14. 14*

    Neutron--Antineutron Oscillations: Discrete Symmetries and Quark Operators

    Zurab Berezhiani🇮🇹 · Arkady Vainshtein🇺🇸

    We analyze status of $\mathbf{C}$, $\mathbf{P}$ and $\mathbf{T}$ discrete symmetries in application to neutron-antineutron transitions breaking conservation of baryon charge $\mathcal{B}$ by two units. At the level of free particles all these symmetries are preserved. This includes $\mathbf{P}$ reflection in spite of the opposite internal parities usually ascribed to neutron and antineutron. Explanation, which goes back to the 1937 papers by E. Majorana and by G. Racah, is based on a definition of parity satisfying ${\mathbf{P}}^2=-1$, instead of ${\mathbf{P}}^2=1$, and ascribing $\mathbf{P}=i$ to both, neutron and antineutron. We apply this to $\mathbf{C}$, $\mathbf{P}$ and $\mathbf{T}$ classification of six-quark operators with $|\Delta \mathcal{B}|=2$. It allows to specify operators contributing to neutron-antineutron oscillations. Remaining operators contribute to other $|\Delta \mathcal{B}|=2$ processes and, in particular, to nuclei instability. We also show that presence of external magnetic field does not induce any new operator mixing the neutron and antineutron provided that rotational invariance is not broken.

    hep-phhep-thPLB(2019)·29 citations
15. 15*

    A new mechanism to enhance primordial tensor fluctuations in single field inflation

    Maria Mylova🇬🇧 · Ogan Özsoy🇬🇧 · Susha Parameswaran🇬🇧 · Gianmassimo Tasinato🇬🇧 · Ivonne Zavala🇬🇧

    We discuss a new mechanism to enhance the spectrum of primordial tensor fluctuations in single field inflationary scenarios. The enhancement relies on a transitory non-attractor inflationary phase, which amplifies the would-be decaying tensor mode, and gives rise to a growth of tensor fluctuations at superhorizon scales. We show that the enhancement produced during this phase can be neatly treated via a tensor duality between an attractor and non-attractor phase, which we introduce. We illustrate the mechanism and duality in a kinetically driven scenario of inflation, with non-minimal couplings between the scalar and the metric.

    ↳ gr-qcastro-ph.COhep-phhep-thJCAP(2018)·35 citations
16. 16*

    No guaranteed neutrino astronomy without (enough) double bang tau and downward HESE muon tracks: An update version

    D. Fargion🇮🇹 · P. G. De Sanctis Lucentini🇷🇺 · M. Yu. Khlopov🇷🇺 · P. Oliva🇮🇹 · F. La Monaca🇮🇹 · P. Paggi🇮🇹

    IceCube Neutrino Astronomy is considered. The tau neutrino flavor paucity and the asymmetry for the tracks suggest a dominant atmospheric charm noise. The correlated cascades and tracks asymmetry with relevant statistics enforce the charm noise dominance in the data. The charm signal may explain at once the absence of correlation for the tracks data with the galactic plane and with known brightest gamma sources.

    ↳ astro-ph.HEastro-ph.GAastro-ph.IMhep-ex+11 citation
17. 17*

    Hidden charm pentaquarks: mass spectrum, magnetic moments, and photocouplings

    Emmanuel Ortiz-Pacheco🇲🇽 · Roelof Bijker🇲🇽 · César Fernández-Ramírez🇲🇽

    We develop an extension of the usual three flavor quark model to four flavors (u, d, s and c), and discuss the classification of pentaquark states with hidden charm. We fit our model to the known baryon spectrum and we predict the double and triple charm baryons, finding good agreement with the most recent lattice QCD calculations. We compute the the ground state of hidden charm pentaquarks and their associated magnetic moments and electromagnetic couplings, of interest to pentaquark photoproduction experiments.

    ↳ nucl-thhep-exhep-phnucl-exJ.Phys.G(2019)·52 citations
18. 18*

    CMB spectroscopy at third-order in cosmological perturbations

    Atsuhisa Ota🇳🇱 · Nicola Bartolo🇮🇹

    Early energy injection to the Cosmic Microwave Background (CMB) from dissipation of acoustic waves generates deviations from the blackbody spectrum not only at second-order but also at third-order in cosmological perturbations. We compute this new spectral distortion $\kappa$ based on third-order cosmological perturbation theory and show that $\kappa$ arises as a result of mode coupling between spectral distortions and temperature perturbations. The ensemble average of $\kappa$ can be directly sourced by (integrated) primordial non-Gaussianity. In particular, we roughly estimate the signal as $\kappa =f_{\mathrm{NL}}^{loc.}\times \mathcal{O}(10^{-18})$ for local type scale-independent non-Gaussianity. The signal is incredibly tiny; however, we argue that it carries a specific frequency dependence different from other types of CMB spectral distortions. Also, it should be noticed that $\kappa$ is sensitive to extremely squeezed shapes of primordial bispectra that cannot be constrained by the CMB anisotropies. Finally, we comment on other possible applications of our results.

    ↳ astro-ph.COgr-qchep-phPRD(2019)·3 citations
19. 19*

    The Belle II Physics Book

    E. Kou · P. Urquijo · W. Altmannshofer · F. Beaujean · G. Bell · M. Beneke · I. I. Bigi · F. Bishara M. Blanke · C. Bobeth · M. Bona · N. Brambilla · V. M. Braun and 517 other authors

    We present the physics program of the Belle II experiment, located on the intensity frontier SuperKEKB $e^{+}{e}^{-}$ collider. Belle II collected its first collisions in 2018, and is expected to operate for the next decade. It is anticipated to collect 50/ab of collision data over its lifetime. This book is the outcome of a joint effort of Belle II collaborators and theorists through the Belle II theory interface platform (B2TiP), an effort that commenced in 2014. The aim of B2TiP was to elucidate the potential impacts of the Belle II program, which includes a wide scope of physics topics: B physics, charm, tau, quarkonium, electroweak precision measurements and dark sector searches. It is composed of nine working groups (WGs), which are coordinated by teams of theorist and experimentalists conveners: Semileptonic and leptonic B decays, Radiative and Electroweak penguins, phi_1 and phi_2 (time-dependent CP violation) measurements, phi_3 measurements, Charmless hadronic B decay, Charm, Quarkonium(like), tau and low-multiplicity processes, new physics and global fit analyses. This book highlights "golden- and silver-channels", i.e. those that would have the highest potential impact in the field. Theorists scrutinised the role of those measurements and estimated the respective theoretical uncertainties, achievable now as well as prospects for the future. Experimentalists investigated the expected improvements with the large dataset expected from Belle II, taking into account improved performance from the upgraded detector.

    ↳ hep-exhep-lathep-phPTEP(2019)·1930 citations
20. 20*

    Hidden regimes during preheating

    Gizem Şengör🇺🇸

    The Effective Field Theory (EFT) of Preheating with scalar fields, implies three types of derivative couplings between the inflaton and the reheating field. Two of these couplings lead to scales below which only one of the two species appear as the low energy modes. In this paper, the variety of low energy regimes in terms of the species they accommodate are explored by studying the scales introduced by the derivative couplings and the dispersion relations they lead to. It is noted that the EFT of two scalar fields can give rise to non-trivial sound speed for both the inflation and reheating sector even at scales where modes of both species propagate freely, suggesting the presence of additional heavy fields. The regimes where one of the species affects the dispersion relation of the other while not appearing as an effective mode itself, are named as "Hidden Regimes" during preheating.

    ↳ gr-qcastro-ph.COhep-phhep-thPRD(2019)·0 citations
21. 21*

    Gravitational Lensing and the Power Spectrum of Dark Matter Substructure: Insights from the ETHOS N-body Simulations

    Ana Díaz Rivero🇺🇸 · Cora Dvorkin🇺🇸 · Francis-Yan Cyr-Racine🇺🇸 · Jesús Zavala🇮🇸 · Mark Vogelsberger🇺🇸

    Strong gravitational lensing has been identified as a promising astrophysical probe to study the particle nature of dark matter. In this paper we present a detailed study of the power spectrum of the projected mass density (convergence) field of substructure in a Milky Way-sized halo. This power spectrum has been suggested as a key observable that can be extracted from strongly lensed images and yield important clues about the matter distribution within the lens galaxy. We use two different $N$-body simulations from the ETHOS framework: one with cold dark matter and another with self-interacting dark matter and a cutoff in the initial power spectrum. Despite earlier works that identified $k\gtrsim 100$ kpc${}^{-1}$ as the most promising scales to learn about the particle nature of dark matter we find that even at lower wavenumbers - which are actually within reach of observations in the near future - we can gain important information about dark matter. Comparing the amplitude and slope of the power spectrum on scales $0.1\lesssim k/$kpc${}^{-1}\lesssim 10$ from lenses at different redshifts can help us distinguish between cold dark matter and other exotic dark matter scenarios that alter the abundance and central densities of subhalos. Furthermore, by considering the contribution of different mass bins to the power spectrum we find that subhalos in the mass range $10^7-10^8$ M${}_{\odot }$ are on average the largest contributors to the power spectrum signal on scales $2\lesssim k/$kpc${}^{-1}\lesssim 15$, despite the numerous subhalos with masses $>10^8$ M${}_{\odot }$ in a typical lens galaxy. Finally, by comparing the power spectra obtained from the subhalo catalogs to those from the particle data in the simulation snapshots we find that the seemingly-too-simple halo model is in fact a fairly good approximation to the much more complex array of substructure in the lens.

    ↳ astro-ph.COhep-phPRD(2018)·63 citations
22. 22*

    Electromagnetic and weak decays of baryons in the unquenched quark model

    Roelof Bijker🇲🇽 · Gustavo Guerrero-Navarro🇲🇽 · Emmanuel Ortiz-Pacheco🇲🇽

    In this contribution, we discuss the electromagnetic and weak decays of baryons in the unquenched quark model and show that the observed discrepancies between the experimental data and the predictions of the constituent quark model can be accounted for in large part by the effects of sea quarks. Finally, the obtained results are discussed in terms of flavor-symmetry breaking.

    ↳ nucl-thhep-phJ.Phys.Conf.Ser.(2018)·0 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.