Tue·Nov 7, 2017Tuesday·November 7, 2017

1. 01*

   ${\tau }^{-}\to {\ell }_i^{-}{\ell }_i^{+}{\ell }_j^{-}{\bar{\nu }}_j{\nu }_{\tau }$ decays with a magnetic dipole term

   M. A. Arroyo-Ureña🇲🇽 · E. Díaz🇲🇽 · O. Meza-Aldama🇲🇽 · G. Tavares-Velasco🇲🇽

   Using the massive helicity formalism we calculate the five-body average square amplitude of the decays ${\tau }^{-}\to {\ell }_i^{-}{\ell }_i^{+}{\ell }_j^{-}{\bar{\nu }}_j{\nu }_{\tau }$ $(\ell =e,\mu )$ within the Standard Model (SM), we then introduce a dimension-five effective vertex ${\Gamma }^{\tau \tau \gamma }$ in order to determine the feasibility of imposing limits on the tau anomalous magnetic dipole moment ($a_{\tau }$) via the current or future experimental measurements of the branching ratio for the decay ${\tau }^{-}\to e^{-}{e}^{+}{e}^{-}{\bar{\nu }}_e{\nu }_{\tau }$.

   hep-phInt.J.Mod.Phys.A(2017)·13 citations
2. 02*

   Strong coupling constant extraction from high-multiplicity Z+jets observables

   Mark Johnson🇬🇧 · Daniel Maître🇬🇧

   We present a strong coupling constant extraction at Next-to-Leading Order QCD accuracy using ATLAS Z+2,3,4 jets data. This is the first extraction using processes with a dependency to high powers of the coupling constant. We obtain values of the strong coupling constant at the $Z$ mass compatible with the world average and with uncertainties commensurate with other NLO extractions at hadron colliders. Our most conservative result for the strong coupling constant is ${\alpha }_S=0.1178_{-0.0043}^{+0.0051}$.

   hep-phPRD(2018)·13 citations
3. 03*

   Remarks on the hidden color components in multi-quark study

   Fan Wang🇨🇳 · Jialun Ping🇨🇳 · Hongxia Huang🇨🇳

   Problems related to the application of hidden color components in multi-quark systems are discussed in this report.

   hep-phnucl-th6 citations
4. 04*

   Electric conductivity of hot and dense quark matter in a magnetic field with Landau level resummation via kinetic equations

   Kenji Fukushima🇯🇵 · Yoshimasa Hidaka🇯🇵

   We compute the electric conductivity of quark matter at finite temperature $T$ and quark chemical potential $\mu$ under a magnetic field $B$ beyond the Lowest Landau level approximation. The electric conductivity transverse to $B$ is dominated by the Hall conductivity ${\sigma }_H$. For the longitudinal conductivity ${\sigma }_{\parallel }$, we need to solve kinetic equations. Then, we numerically find that ${\sigma }_{\parallel }$ has only mild dependence on $\mu$ and the quark mass $m_q$. Moreover, ${\sigma }_{\parallel }$ first decreases and then linearly increases as a function of $B$, leading to an intermediate $B$ region which looks consistent with the experimental signature for the chiral magnetic effect. We also point out that ${\sigma }_{\parallel }$ at nonzero $B$ remains within the range of the lattice-QCD estimate at $B=0$.

   hep-phcond-mat.str-elPRL(2018)·85 citations
5. 05*

   Coupled dynamics of heavy and light flavor flow harmonics from EPOSHQ

   P.B. Gossiaux🇫🇷 · J. Aichelin🇫🇷 · M. Nahrgang🇫🇷 · V. Ozvenchuk🇵🇱 · K. Werner🇫🇷

   We pursue the study of event by event correlations between low-mass particles and heavy mesons flow harmonics in ultrarelativistic heavy ion collisions and clarify some ambiguities found in one of our previous work.

   hep-phnucl-thEPJ Web Conf.(2018)·1 citation
6. 06*

   Revisiting hidden-charm pentaquarks from QCD sum rules

   Jia-Bing Xiang🇨🇳 · Hua-Xing Chen🇨🇳 · Wei Chen🇨🇳 · Xiao-Bo Li🇨🇳 · Xing-Qun Yao🇨🇳 · Shi-Lin Zhu🇨🇳

   We revisit the hidden-charm pentaquark states $P_c(4380)$ and $P_c(4450)$ using the method of QCD sum rules by requiring the pole contribution to be larger than or around 30\% to better insure the one-pole parametrization to be valid. We find two mixing currents and our results suggest that the $P_c(4380)$ and $P_c(4450)$ can be identified as hidden-charm pentaquark states having $J^P=3/2^{-}$ and $5/2^{+}$, respectively, while there still exist other possible spin-parity assignments, such as $J^P=3/2^{+}$ and $J^P=5/2^{-}$, which needs to be clarified in further theoretical and experimental studies.

   hep-phhep-exCPC(2019)·18 citations
7. 07*

   Directly detecting Isospin-Violating Dark Matter

   Chris Kelso🇺🇸 · Jason Kumar🇺🇸 · Danny Marfatia🇺🇸 · Pearl Sandick🇺🇸

   We consider the prospects for multiple dark matter direct detection experiments to determine if the interactions of a dark matter candidate are isospin-violating. We focus on theoretically well-motivated examples of isospin-violating dark matter (IVDM), including models in which dark matter interactions with nuclei are mediated by a dark photon, a Z, or a squark. We determine that the best prospects for distinguishing IVDM from the isospin-invariant scenario arise in the cases of dark photon- or Z-mediated interactions, and that the ideal experimental scenario would consist of large exposure xenon- and neon-based detectors. If such models just evade current direct detection limits, then one could distinguish such models from the standard isospin-invariant case with two detectors with of order 100 ton-year exposure.

   hep-phastro-ph.COhep-exPRD(2018)·10 citations
8. 08*

   Hidden charm pentaquark and $\Lambda (1405)$ in the ${\Lambda }_b^0\to {\eta }_c{K}^{-}p(\pi \Sigma )$ reaction

   Ju-Jun Xie🇨🇳 · Wei-Hong Liang🇨🇳 · Eulogio Oset🇪🇸

   We have performed a study of the ${\Lambda }_b^0\to {\eta }_c{K}^{-}p$ and ${\Lambda }_b^0\to {\eta }_c\pi \Sigma$ reactions based on the dominant Cabibbo favored weak decay mechanism. We show that the $K^{-}p$ produced only couples to ${\Lambda }^{\ast }$ states, not ${\Sigma }^{\ast }$ and that the $\pi \Sigma$ state is only generated from final state interaction of $\bar{K}N$ and $\eta \Lambda$ channels which are produced in a primary stage. This guarantees that the $\pi \Sigma$ state is generated in isospin $I=0$ and we see that the invariant mass produces a clean signal for the $\Lambda (1405)$ of higher mass at $1420$ MeV. We also study the ${\eta }_{c}p$ final state interaction, which is driven by the excitation of a hidden charm resonance predicted before. We relate the strength of the different invariant mass distributions and find similar strengths that should be clearly visible in an ongoing LHCb experiment. In particular we predict that a clean peak should be seen for a hidden charm resonance that couples to the ${\eta }_{c}p$ channel in the invariant ${\eta }_{c}p$ mass distribution.

   hep-phhep-exnucl-exnucl-thPLB(2018)·15 citations
9. 09*

   Quantum monopole via Heisenberg quantization

   Vladimir Dzhunushaliev🇰🇿

   Using a non-perturbative quantization method originally due to Heisenberg we obtain {\it quantum} monopole solutions and {\it quantum} flux tube solutions for the SU(3) strong interaction gauge theory. For the quantum monopole solution we find that the radial chromomagnetic field decreases exponentially with a scale set by the effective gluon mass. The quantum flux tube solution stretches between a monopole and anti-monopole and has a longitudinal chromomagnetic field. Both solutions exhibit characteristics of the Meissner effect and are conjectured to have a connection to the confinement phenomenon.

   hep-phhep-th2 citations
10. 10*

    Model predictions for azimuthal spin asymmetries for HERMES and COMPASS kinematics

    Tanmay Maji🇮🇳 · Dipankar Chakrabarti🇮🇳 · O.V. Teryaev🇷🇺

    We have presented the results for the single and double spin asymmetries in semi-inclusive deep inelastic scatterings for proton in a light front quark-diquark model. The asymmetries generated by the T-even TMDs are discussed here. The model predictions are found to agree with the available data. We also present our model predictions for the Collins asymmetry for the future electron-ion collider experiments.

    hep-phPRD(2017)·12 citations
11. 11*

    The triplet photoproduction on a free electron as a possible way to search for a dark photon

    G.I. Gakh🇺🇦 · M.I. Konchatnij🇺🇦 · N.P. Merenkov🇺🇦

    The process of the triplet production on a free electron, $\gamma e^{-}\to e^{+}{e}^{-}{e}^{-}$, has been investigated as a reaction where a dark photon, $A^{\prime }$, is produced as a virtual state with subsequent decay into a $e^{+}{e}^{-}$-pair. This effect arises due to the so-called kinetic mixing and is characterized by the small parameter $ϵ$ describing the coupling strength relative to the electric charge e. The search of $A^{\prime }$ in this process has advantage because the background to the $A^{\prime }$ signal is pure QED. This QED background is described by eight Feynman diagrams taking into account the identity of final electrons. As concern $A^{\prime }$, we leave its contribution in Compton-like diagrams only since, in this case, the virtual dark photon is time-like and its propagator has the Breit-Wigner form. So, near the resonance $A^{\prime }$ can manifest itself. The contribution of $A^{\prime }$ in Borsellino diagrams is negligible since, in this case, the virtual dark photon is space-like, the $A^{\prime }$ propagator does not peak and effect is proportional at least to ${ϵ}^2$. We calculate the distributions over the invariant masses of the both produced $e^{+}{e}^{-}$ pairs and search for the kinematical region where the Compton-like diagrams contribution is not suppressed as compared with the Borsellino one. We estimate what value of the parameter $ϵ$, as a function of the dark photon mass, can be obtained at given number of the measured events.

    hep-ph1 citation
12. 12*

    Electroweak phase transition and entropy release in the early universe

    Arnab Chaudhuri🇷🇺 · Alexander Dolgov🇷🇺

    It is shown that the vacuum-like energy of the Higgs potential at non-zero temperatures leads, in the course of the cosmological expansion, to a small but non-negligible rise of the entropy density in the comoving volume. This increase is calculated in the frameworks of the minimal standard model. The result can have a noticeable effect on the outcome of baryo-through-leptogenesis.

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

    Polarization phenomena in process $e^{+}+e^{-}\to N+\bar{N}+\gamma$

    G. I. Gakh · N. P. Merenkov🇺🇦 · M. I. Konchatnij🇺🇦 · A. G. Gakh

    The emission of the hard photon by the initial state is considered. The nucleon polarization and the differential cross sections for some experimental conditions have been calculated. The case of the emission of the collinear (with respect to the direction of the electron beam momentum) photon is considered separately. The differential cross section, the nucleon polarization, the correlation coefficients for both polarized nucleons (provided the electron beam is unpolarized or longitudinally polarized), the transfer polarization from the longitudinally polarized electron beam to the nucleon have been calculated. The photon energy distribution for the reaction $e^{+}{e}^{-}\to h_1{h}_2\gamma$, where $h_1$ and $h_2$ are some hadrons for the case of the collinear photon, emitted in the initial state, has been calculated. As $h_1{h}_2$ final state we considered some channels, namely: two spinless mesons (for example, ${\pi }^{+}{\pi }^{-},K^{+}{K}^{-}$), two spin--one particles (for example, ${\rho }^{+}{\rho }^{-},d\bar{d}$), the $\pi a_1(1260)$ and $\Delta (1232)\bar{N}$ channels. The photon energy distributions are calculated in terms of the form factors of the ${\gamma }^{\ast }\to h_1{h}_2$ transition (${\gamma }^{\ast }$ is the virtual photon).

    hep-phEast Eur.J.Phys.(2018)·0 citations
14. 14*

    Off-shell $t\bar{t}j$ production and top quark mass studies at the LHC

    G. Bevilacqua🇭🇺 · H. B. Hartanto🇬🇧 · M. Kraus🇩🇪 · M. Schulze🇩🇪 · M. Worek🇩🇪

    Precision studies of the properties of the top quark represent a cornerstone of the LHC physics program. In this contribution we focus on the production of $t\bar{t}$ pairs in association with one hard jet and in particular on its connection with precision measurements of the top quark mass at the LHC. We report a summary of a full calculation of the process $pp\to e^{+}{\nu }_e{\mu }^{-}{\bar{\nu }}_{\mu }b\bar{b}j$ at NLO QCD accuracy, which describes $t\bar{t}j$ production with leptonic decays beyond the Narrow Width Approximation (NWA), and discuss the impact of the off-shell effects through comparisons with NWA. Finally we explore the sensitivity of $t\bar{t}j$ in the context of top-quark mass extraction with the template method, considering two benchmark observables as case studies.

    hep-phActa Phys.Polon.B(2017)·1 citation
15. 15*

    Coherent and incoherent $J/\psi$ photonuclear production in an energy-dependent hot-spot model

    Jan Cepila🇨🇿 · Jesus Guillermo Contreras🇨🇿 · Michal Krelina🇨🇱

    In a previous publication, we have presented a model for the photoproduction of $J/\psi$ vector mesons off protons, where the proton structure in the impact-parameter plane is described by an energy-dependent hot-spot profile. Here we extend this model to study the photonuclear production of $J/\psi$ vector mesons in coherent and incoherent interactions of heavy nuclei. We study two methods to extend the model to the nuclear case: using the standard Glauber-Gribov formalism and using geometric scaling to obtain the nuclear saturation scale. We find that the incoherent cross section changes sizably with the inclusion of subnucleonic hot spots, and that this change is energy dependent. We propose to search for this behavior by measuring the ratio of the incoherent to coherent cross section at different energies. We compare the results of our model to results from RHIC and from the Run 1 at the LHC finding a satisfactory agreement. We also present predictions for the LHC at the new energies reached in Run 2. The predictions include $J/\psi$ production in ultra-peripheral collisions, as well as the recently observed photonuclear production in peripheral collisions.

    hep-phnucl-thPRC(2018)·134 citations
16. 16*

    Comprehending Isospin breaking effects of $X(3872)$ in a Friedrichs-model-like scheme

    Zhi-Yong Zhou🇨🇳 · Zhiguang Xiao🇨🇳

    Recently, we have shown that the $X(3872)$ state can be naturally generated as a bound state by incorporating the hadron interactions into the Godfrey-Isgur quark model using the Friedrichs-like model combined with the QPC model, in which the wave function for the $X(3872)$ as a combination of the bare $c\bar{c}$ state and the continuum states can also be obtained. Under this scheme, we now investigate the isospin breaking effect of $X(3872)$ in its decays to $J/\psi {\pi }^{+}{\pi }^{-}$ and $J/\psi {\pi }^{+}{\pi }^{-}{\pi }^0$. By Considering its dominant continuum parts coupling to $J/\psi \rho$ and $J/\psi \omega$ through the quark rearrangement process, one could obtain the reasonable ratio of $\mathcal{B}(X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}{\pi }^0)/\mathcal{B}(X(3872)\to J/\psi {\pi }^{+}{\pi }^{-})\simeq (0.58\sim 0.92)$. It is also shown that the $\bar{D}{D}^{\ast }$ invariant mass distributions in the $B\to \bar{D}{D}^{\ast }K$ decays could be understood qualitatively at the same time. This scheme may provide more insight to understand the enigmatic nature of the $X(3872)$ state.

    hep-phhep-exnucl-thPRD(2018)·31 citations
17. 17*

    Spin Dependence of Small-Angle Proton-Nucleus Scattering

    Michal Krelina🇨🇱 · Boris Z. Kopeliovich🇨🇱

    We study the single-spin asymmetry, $A_N(t)$, arising from Coulomb-nuclear interference (CNI) at small 4-momentum transfer squared, $-t=q^2$, aiming at explanation of the recent data from the PHENIX experiment at RHIC on polarized proton-nucleus scattering, exposing a nontrivial $t$-dependence of $A_N$. We found that the failure of previous theoretical attempts to explain these data, was due to lack of absorptive corrections in the Coulomb amplitude of $pA$ elastic scattering. Our prominent observation is that the main contribution to $A_N(t)$ comes from interference of the amplitudes of ultra-peripheral and central collisions.

    hep-phnucl-th1 citation
18. 18*

    Dark matter theory: Implications and future prospects for Fermi

    Pat Scott🇬🇧

    I give a brief review of some of the implications of Fermi data for theories of the identity of dark matter, and their combination with data from other complementary probes. I also preview some of the prospects for probing such models with future data.

    hep-phastro-ph.COPoS(2020)·1 citation
19. 19*

    No-scale SUGRA Inflation and Type-I seesaw

    Ila Garg🇮🇳 · Subhendra Mohanty🇮🇳

    We show that MSSM with three right handed neutrinos incorporating a renormalizable Type-I seesaw superpotential and no-scale SURGA Kähler potential can lead to a Starobinsky kind of inflation potential along a flat direction associated with gauge invariant combination of Higgs, slepton and right handed sneutrino superfields. The inflation conditions put constraints on the Dirac Yukawa coupling and the Majorana masses required for the neutrino masses and also demands the tuning among the parameters. The scale of inflation is set by the mass of the heaviest right handed neutrino. We also fit the neutrino data from oscillation experiments at low scale using the effective RGEs of MSSM with three right handed neutrinos.

    hep-phInt.J.Mod.Phys.A(2018)·16 citations
20. 20*

    Probing new physics through $B_s^{\ast }\to {\mu }^{+}{\mu }^{-}$ decay

    Dinesh Kumar🇮🇳 · Jyoti Saini🇮🇳 · Shireen Gangal🇺🇸 · Sanjeeda Bharati Das🇮🇳

    We perform a model independent analysis of new physics in $B_s^{\ast }\to {\mu }^{+}{\mu }^{-}$ decay. We intend to identify new physics operator(s) which can provide large enhancement in the branching ratio of $B_s^{\ast }\to {\mu }^{+}{\mu }^{-}$ above its standard model prediction. For this, we consider new physics in the form of vector, axial-vector, scalar and pseudoscalar operators. We find that scalar and pseudoscalar operators do not contribute to the branching ratio of $B_s^{\ast }\to {\mu }^{+}{\mu }^{-}$. We perform a global fit to all relevant $b\to s{\mu }^{+}{\mu }^{-}$ data for different new physics scenarios. For each of these scenarios, we predict $Br(B_s^{\ast }\to {\mu }^{+}{\mu }^{-})$. We find that a significant enhancement in $Br(B_s^{\ast }\to {\mu }^{+}{\mu }^{-})$ is not allowed by any of these new physics operators. In fact, for all new physics scenarios providing a good fit to the data, the branching ratio of $B_s^{\ast }\to {\mu }^{+}{\mu }^{-}$ is suppressed as compared to the SM value. Hence the present $b\to s{\mu }^{+}{\mu }^{-}$ data indicates that the future measurements of $Br(B_s^{\ast }\to {\mu }^{+}{\mu }^{-})$ is expected to be suppressed in comparison to the standard model prediction.

    hep-phPRD(2018)·13 citations
21. 21*

    CP4 miracle: shaping Yukawa sector with CP symmetry of order four

    P.M. Ferreira🇵🇹 · Igor P. Ivanov🇵🇹 · Enrique Jiménez🇲🇽 · Roman Pasechnik🇸🇪 · Hugo Serôdio🇸🇪

    We explore the phenomenology of a unique three-Higgs-doublet model based on the single CP symmetry of order 4 (CP4) without any accidental symmetries. The CP4 symmetry is imposed on the scalar potential and Yukawa interactions, strongly shaping both sectors of the model and leading to a very characteristic phenomenology. The scalar sector is analyzed in detail, and in the Yukawa sector we list all possible CP4-symmetric structures which do not run into immediate conflict with experiment, namely, do not lead to massless or mass-degenerate quarks nor to insufficient mixing or CP-violation in the CKM matrix. We show that the parameter space of the model, although very constrained by CP4, is large enough to comply with the electroweak precision data and the LHC results for the 125 GeV Higgs boson phenomenology, as well as to perfectly reproduce all fermion masses, mixing, and CP violation. Despite the presence of flavor changing neutral currents mediated by heavy Higgs scalars, we find through a parameter space scan many points which accurately reproduce the kaon CP-violating parameter ${ϵ}_K$ as well as oscillation parameters in K and $B_{(s)}$ mesons. Thus, CP4 offers a novel minimalistic framework for building models with very few assumptions, sufficient predictive power, and rich phenomenology yet to be explored.

    hep-phJHEP(2018)·35 citations
22. 22*

    Clockwork for Neutrino Masses and Lepton Flavor Violation

    Alejandro Ibarra🇩🇪 · Ashwani Kushwaha🇮🇳 · Sudhir K. Vempati🇮🇳

    We investigate the generation of small neutrino masses in a clockwork framework which includes Dirac mass terms as well as Majorana mass terms for the new fermions. We derive analytic formulas for the masses of the new particles and for their Yukawa couplings to the lepton doublets, in the scenario where the clockwork parameters are universal. When the Majorana masses all vanish, the zero mode of the clockwork sector forms a Dirac pair with the active neutrino, with a mass which is in agreement with oscillations experiments for a sufficiently large number of clockwork gears. On the other hand, when the Majorana masses do not vanish, neutrino masses are generated via the seesaw mechanism. In this case, and due to the fact that the effective Yukawa couplings of the higher modes can be sizable, neutrino masses can only be suppressed by postulating a large Majorana mass for all the gears. Finally, we discuss the constraints on the mass scale of the clockwork fermions from the non-observation of the rare leptonic decay $\mu \to e\gamma$.

    hep-phPLB(2018)·34 citations
23. 23*

    reSolve - A Transverse Momentum Resummation Tool

    Francesco Coradeschi🇬🇧 · Thomas Cridge🇬🇧

    In this note, we introduce the new tool reSolve, a Monte Carlo differential cross-section and parton-level event generator whose main purpose is to add transverse momentum resummation to a general class of inclusive processes at hadron colliders, namely all those which do not involve hadrons or jets in the measured final state. This documentation refers to the first main version release, which will form the basis for continued developments, consequently it only implements the key features of those we plan to ultimately include. This article acts as a manual for the program; describing in detail its use, structure, validation and results; whilst also highlighting key aspects of the resummation formalism applied. It details the two classes of processes so far included; these are diphoton production and Drell-Yan production. A main concept behind the development of the tool is that it is a hands-on white box for the user: significant effort has been made to give the program a modular structure, making the various parts which comprise it independent of each other as much as possible and ensuring they are transparently documented, customizable and, in principle, replaceable with something that may better serve the users needs. reSolve is a new C++ program, based on an evolution of the private Fortran code 2gres, previously used for the calculations in refs. [1] and [2]; it is also influenced by the DYRes Fortran code of refs. [3] and [4]. This initial version calculates the low transverse momentum contribution to the fully differential cross-section for two main categories of processes; the inclusive production of two photons, and inclusive Drell-Yan production. In all cases resummation up to Next-to-Next-to-Leading Logarithm (NNLL) is included. We aim to extend the program to several more processes in the near future. The program is publicly available on Github.

    hep-phhep-exComput.Phys.Commun.(2019)·28 citations
24. 24*

    Update of Global Two-Higgs-Doublet Model Fits

    Debtosh Chowdhury🇮🇹 · Otto Eberhardt🇪🇸

    We perform global fits of Two-Higgs-Doublet models with a softly broken ${\mathbb{Z}}_2$ symmetry to recent results from the LHC detectors CMS and ATLAS, that is signal strengths and direct search limits obtained at $\sqrt{s}=8$ TeV and $\sqrt{s}=13$ TeV. We combine all available ATLAS and CMS constraints with the other relevant theoretical and experimental bounds and present the latest limits on the model parameters. We obtain that deviations from the so-called alignment limit $\beta -\alpha =\pi /2$ cannot be larger than $0.03$ in type I and have to be smaller than $0.02$ in the remaining three types. For the latter, we also observe lower limits on the heavy Higgs masses in the global fit. The splittings between these masses cannot exceed $200$ GeV in the types I and X and $130$ GeV in the types II and Y. Finally, we find that the decay widths of the heavy Higgs particles cannot be larger than $7\%$ of their masses if they are lighter than $1.5$ TeV.

    hep-phhep-exJHEP(2018)·104 citations
25. 25*

    Hidden-Sector Spectroscopy with Gravitational Waves from Binary Neutron Stars

    Djuna Croon🇺🇸 · Ann E. Nelson🇺🇸 · Chen Sun🇨🇳 · Devin G. E. Walker🇺🇸 · Zhong-Zhi Xianyu🇺🇸

    We show that neutron star binaries can be ideal laboratories to probe hidden sectors with a long range force. In particular, it is possible for gravitational wave detectors such as LIGO and Virgo to resolve the correction of waveforms from ultralight dark gauge bosons coupled to neutron stars. We observe that the interaction of the hidden sector affects both the gravitational wave frequency and amplitude in a way that cannot be fitted by pure gravity.

    hep-phgr-qchep-thApJL(2018)·56 citations
26. 26*

    Dimension-six matrix elements for meson mixing and lifetimes from sum rules

    M. Kirk🇬🇧 · A. Lenz🇬🇧 · T. Rauh🇬🇧

    The hadronic matrix elements of dimension-six $\Delta F=0,2$ operators are crucial inputs for the theory predictions of mixing observables and lifetime ratios in the $B$ and $D$ system. We determine them using HQET sum rules for three-point correlators. The results of the required three-loop computation of the correlators and the one-loop computation of the QCD-HQET matching are given in analytic form. For mixing matrix elements we find very good agreement with recent lattice results and comparable theoretical uncertainties. For lifetime matrix elements we present the first ever determination in the $D$ meson sector and the first determination of $\Delta B=0$ matrix elements with uncertainties under control - superseeding preliminary lattice studies stemming from 2001 and earlier. With our state-of-the-art determination of the bag parameters we predict: $\tau (B^{+})/\tau (B_d^0)=1.082_{-0.026}^{+0.022}$, $\tau (B_s^0)/\tau (B_d^0)=1.0007\pm 0.0025$, $\tau (D^{+})/\tau (D^0)=2.7_{-0.8}^{+0.7}$ and the mixing-observables in the $B_s$ and $B_d$ system, in good agreement with the most recent experimental averages.

    hep-phhep-latJHEP(2017)·141 citations
27. 27*

    Addressing Neutrino Mixing Models with DUNE and T2HK

    Sanjib Kumar Agarwalla🇮🇳 · Sabya Sachi Chatterjee🇮🇳 · S. T. Petcov🇮🇹 · A. V. Titov🇬🇧

    We consider schemes of neutrino mixing arising within the discrete symmetry approach to the well-known flavour problem. We concentrate on $3\nu$ mixing schemes in which the cosine of the Dirac CP violation phase ${\delta }_{\mathrm{CP}}$ satisfies a sum rule by which it is expressed in terms of three neutrino mixing angles ${\theta }_{12}$, ${\theta }_{23}$, and ${\theta }_{13}$, and a fixed real angle ${\theta }_{12}^{\nu }$, whose value depends on the employed discrete symmetry and its breaking. We consider five underlying symmetry forms of the neutrino mixing matrix: bimaximal (BM), tri-bimaximal (TBM), golden ratio A (GRA) and B (GRB), and hexagonal (HG). For each symmetry form, the sum rule yields specific prediction for $\cos {\delta }_{\mathrm{CP}}$ for fixed ${\theta }_{12}$, ${\theta }_{23}$, and ${\theta }_{13}$. In the context of the proposed DUNE and T2HK facilities, we study (i) the compatibility of these predictions with present neutrino oscillation data, and (ii) the potential of these experiments to discriminate between various symmetry forms.

    hep-phhep-exphysics.ins-detEPJC(2018)·32 citations
28. 28*

    Pseudoscalar Mediators: A WIMP model at the Neutrino Floor

    Giorgio Arcadi🇩🇪 · Manfred Lindner🇩🇪 · Farinaldo S. Queiroz🇧🇷 · Werner Rodejohann🇩🇪 · Stefan Vogl🇩🇪

    Due to its highly suppressed cross section (fermionic) dark matter interacting with the Standard Model via pseudoscalar mediators is expected to be essentially unobservable in direct detection experiments. We consider both a simplified model and a more realistic model based on an extended two Higgs doublet model and compute the leading one-loop contribution to the effective dark matter- nucleon interaction. This higher order correction dominates the scattering rate completely and can naturally, i.e. for couplings of order one, lead to a direct detection cross section in the vicinity of the neutrino floor. Taking the observed relic density and constraints from low-energy observables into account we analyze the direct detection prospects in detail and find regions of parameter space that are within reach of upcoming direct detection experiments such as XENONnT, LZ, and DARWIN.

    hep-phJCAP(2018)·98 citations
29. 29*

    ${\Sigma }_b\to {\Sigma }_c^{\ast }$ weak decays in the light-front quark model with two schemes to deal with the polarization of diquark

    Hong-Wei Ke · Ning Hao · Xue-Qian Li🇨🇳

    Thanks to the remarkable achievements of LHC, a large database on baryons has been accumulated, so it is believed that the time for precisely studying baryons especially heavy baryons, has come. By analyzing the data, the quark-diquark structure which has been under intensive discussions, can be tested. In this work the decay widths of weak transitions ${\Sigma }_b\to {\Sigma }_c^{\ast }+X$ are calculated in terms of the light front quark model (LFQM). To carry out the calculations, the quark-diquark picture is employed where an axial-vector diquark composed of two light quarks serves as a spectator in the concerned processes. The first step of this work is to construct the vertex functions for ${\Sigma }_c^{(\ast )}$ and ${\Sigma }_b$, then the relevant form factors are derived. It is shown that under the heavy quark limit the Isgur-Wise functions for the transition are re-deduced. Indeed, how to properly depict the polarization (${ϵ}_{\mu }$) of the diquark is slightly tricky. In this work, we apply two schemes to explicitly determine the momentum-dependence of the diquark. The corresponding numerical results are presented which will be testified by the future experiments.

    hep-phJ.Phys.G(2019)·24 citations
30. 30*

    Status of hadronic light-by-light scattering and the muon $(g-2)$

    P. Masjuan🇪🇸 · P. Sanchez-Puertas🇨🇿

    In this talk we review the recent progress on the numerical determination of the Hadronic Light-by-Light contribution to the anomalous magnetic moment of the muon and we discuss the role of experimental data on the accuracy of its determination. Special emphasis on the main contribution, the pseudoscalar piece, is made. Gathering recent progress in the light-by-light scattering contribution we consider $a_{\mu }^{\mathrm{HLBL}}=(12.1\pm 3.0)\times 10^{-10}$ as a good summary of the state-of-the-art calculations which still claims for a $4\sigma$ deviation between theory and experiment for the $(g-2{)}_{\mu }$.

    hep-phPoS(2017)·1 citation
31. 31*

    Refinements of the Bottom and Strange MSSM Higgs Yukawa Couplings at NNLO

    Margherita Ghezzi🇨🇭 · Seraina Glaus🇨🇭 · Dario Müller🇨🇭 · Timo Schmidt🇩🇪 · Michael Spira🇨🇭

    We extend the already existing two-loop calculation of the effective bottom-Yukawa coupling in the MSSM. In addition to the resummation of the dominant corrections for large values of tg$\beta$, we include the subleading terms related to the trilinear Higgs coupling $A_b$ and contributions induced by the electroweak gauge couplings. This calculation has been extended to the NNLO corrections to the MSSM strange-Yukawa coupling. Our analysis leads to residual theoretical uncertainties of the effective Yukawa couplings at the per-cent level.

    hep-phEPJC(2021)·16 citations
32. 32*

    SU(5) with Non-Universal Gaugino Masses

    M. Adeel Ajaib🇶🇦

    We explore the sparticle spectroscopy of the supersymmetric SU(5) model with non-universal gaugino masses in light of latest experimental searches. We assume that the gaugino mass parameters are independent at the GUT scale. We find that the observed deviation in the anomalous magnetic moment of the muon can be explained in this model. The parameter space that explains this deviation predicts a heavy colored sparticle spectrum whereas the sleptons can be light. We also find a notable region of the parameter space that yields the desired relic abundance for dark matter. In addition, we analyze the model in light of latest limits from direct detection experiments and find that the parameter space corresponding to the observed deviation in the muon anomalous magnetic moment can be probed at some of the future direct detection experiments.

    hep-phInt.J.Mod.Phys.A(2018)·6 citations
33. 33*

    Current Status of Top-Specific Variant Axion Model

    Cheng-Wei Chiang🇹🇼 · Hajime Fukuda🇯🇵 · Michihisa Takeuchi🇯🇵 · Tsutomu T. Yanagida🇯🇵

    The invisible variant axion model is very attractive as it is free from the domain wall problem. This model requires at least two Higgs doublets at the electroweak scale, with one Higgs doublet carrying a nonzero Peccei-Quinn (PQ) charge and the other being neutral under the PQ $\text{U}(1)$ symmetry. We consider a scenario where only the right-handed top quark is charged under the PQ symmetry and couples with the PQ-charged Higgs doublet. As a general prediction of this model, the top quark can decay to the observed standard model-like Higgs boson $h$ and the charm or up quark, $t\to hc/u$, which recently exhibit slight excesses at LHC Run-I and Run-II. It will soon be testable at the LHC Run-II. If the rare top decay excess stays at the observed central value, we show that $\tan \beta \sim 1$ or smaller is preferred by the Higgs data. The chiral nature of the Higgs flavor-changing interaction is a distinctive feature, and can be tested using the angular distribution of the $t\to ch$ decays at the LHC.

    hep-phhep-exPRD(2018)·15 citations
34. 34*

    Efficient operators for studying higher partial waves

    Jia-jun Wu🇦🇺 · Waseem Kamleh🇦🇺 · Derek B. Leinweber🇦🇺 · Gerrit Schierholz🇩🇪 · Ross D. Young🇦🇺 · James M. Zanotti🇦🇺

    An extended multi-hadron operator is developed to extract the spectra of irreducible representations in the finite volume. The irreducible representations of the cubic group are projected using a coordinate-space operator. The correlation function of this operator is computationally efficient to extract lattice spectra. In particular, this new formulation only requires propagator inversions from two distinct locations, at fixed physical separation. We perform a proof-of-principle study on a $24^3\times 48$ lattice volume with $m_{\pi }\approx 900$~MeV by isolating the spectra of $A_1^{+}$, $E^{+}$ and $T_2^{+}$ of the $\pi \pi$ system with isospin-2 in the rest frame.

    ↳ hep-lathep-phnucl-thEPJ Web Conf.(2018)·0 citations
35. 35*

    Photo- and Electro-excitation of Bound Neutrons and Protons

    Satoshi X. Nakamura (Universidade Cruzeiro do Sul)🇯🇵

    Data for pion photo-productions off the neutron ($\gamma n\to \pi N$) have been primarily extracted from deuteron-target data ($\gamma d\to \pi NN$) by applying kinematical cuts thereby isolating the quasi-free samples. We critically examine if the neutron-target data obtained through this conventional procedure can be contaminated by final state interactions (FSI) and/or the kinematical cuts. The analysis is conducted with a theoretical model for $\gamma d\to \pi NN$ that takes account of the impulse mechanisms supplemented by the $NN$ and $\pi N$ rescattering mechanisms. We show that the FSI effects still visibly remain in the extracted $\gamma$`$n$'$\to \pi N$ unpolarized cross sections and polarization asymmetries $E$ even after the kinematical cuts are applied. We also find the FSI effects on $\gamma$`$n$'$\to {\pi }^{0}n$ can be somewhat different from those on $\gamma$`$p$'$\to {\pi }^{0}p$.

    ↳ nucl-thhep-phnucl-exFew Body Syst.(2018)·2 citations
36. 36*

    Analytical attractor and the divergence of the slow-roll expansion in relativistic hydrodynamics

    Gabriel S. Denicol (Niteroi, Fluminense U.)🇧🇷 · Jorge Noronha (Sao Paulo U.)🇧🇷

    We find the general analytical solution of the viscous relativistic hydrodynamic equations (in the absence of bulk viscosity and chemical potential) for a Bjorken expanding fluid with a constant shear viscosity relaxation time. We analytically determine the hydrodynamic attractor of this fluid and discuss its properties. We show for the first time that the slow-roll expansion, a commonly used approach to characterize the attractor, diverges. This is shown to hold also in a conformal plasma. The gradient expansion is found to converge in an example where causality and stability are violated.

    ↳ nucl-thhep-phhep-thPRD(2018)·77 citations
37. 37*

    Search for light tetraquark states in ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays

    Belle Collaboration: S. Jia · C. P. Shen · C. Z. Yuan · I. Adachi · J. K. Ahn · H. Aihara · S. Al Said · D. M. Asner · H. Atmacan · T. Aushev · R. Ayad · V. Babu and 182 other authors

    We search for the $J^{PC}=0^{--}$ and $1^{+-}$ light tetraquark states with masses up to 2.46~GeV/$c^2$ in ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays with data samples of $(102\pm 2)$ million and $(158\pm 4)$ million events, respectively, collected with the Belle detector. No significant signals are observed in any of the studied production modes, and 90\% credibility level (C.L.) upper limits on their branching fractions in ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays are obtained. The inclusive branching fractions of the ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays into final states with $f_1(1285)$ are measured to be $\mathcal{B}({\rm Y}(1S)\to f_1(1285)+anything)=(46\pm 28(stat.)\pm 13(syst.))\times 10^{-4}$ and $\mathcal{B}({\rm Y}(2S)\to f_1(1285)+anything)=(22\pm 15(stat.)\pm 6.3(syst.))\times 10^{-4}$. The measured ${\chi }_{b2}\to J/\psi +anything$ branching fraction is measured to be $(1.50\pm 0.34(stat.)\pm 0.22(syst.))\times 10^{-3}$, and 90\% C.L. upper limits for the ${\chi }_{b0,b1}\to J/\psi +anything$ branching fractions are found to be $2.3\times 10^{-3}$ and $1.1\times 10^{-3}$, respectively. For $\mathcal{B}({\chi }_{b1}\to \omega +anything)$, the branching fraction is measured to be $(4.9\pm 1.3(stat.)\pm 0.6(syst.))\times 10^{-2}$. %($<3.68\times 10^{-2}$ at 90\% C.L.). All results reported here are the first measurements for these modes.

    ↳ hep-exhep-phPRD(2017)·4 citations
38. 38*

    Enabling rootless Linux Containers in multi-user environments: the udocker tool

    Jorge Gomes🇵🇹 · Isabel Campos🇪🇸 · Emanuele Bagnaschi🇩🇪 · Mario David🇵🇹 · Luis Alves🇵🇹 · Joao Martins🇵🇹 · Joao Pina🇵🇹 · Alvaro Lopez-Garcia🇪🇸 · Pablo Orviz🇪🇸

    Containers are increasingly used as means to distribute and run Linux services and applications. In this paper we describe the architectural design and implementation of udocker, a tool which enables the user to execute Linux containers in user mode. We also present a few practical applications, using a range of scientific codes characterized by different requirements: from single core execution to MPI parallel execution and execution on GPGPUs.

    ↳ cs.SEhep-lathep-phComput.Phys.Commun.(2018)·9 citations
39. 39*

    Cosmic screening of the gravitational interaction

    Maxim Eingorn🇺🇸 · Claus Kiefer🇩🇪 · Alexander Zhuk🇺🇦

    We study a universe filled with cold dark matter in the form of discrete inhomogeneities (e.g., galaxies) and dark energy in the form of a continuous perfect fluid. We develop a first-order scalar perturbation theory in the weak gravity limit around a spatially flat Friedmann universe. Our approach works at all cosmic scales and incorporates linear and nonlinear effects with respect to energy density fluctuations. The gravitational potential can be split into individual contributions from each matter source. Each potential is characterized by a Yukawa interaction with the same range, which is of the order of 3700 Mpc at the present time. The derived equations can form the theoretical basis for numerical simulations for a wide class of modern cosmological models.

    ↳ gr-qcastro-ph.COhep-phhep-thInt.J.Mod.Phys.D(2017)·18 citations
40. 40*

    Improvement of heavy-heavy current for calculation of $\bar{B}\to D^{(\ast )}\ell \bar{\nu }$ form factors using Oktay-Kronfeld heavy quarks

    Jon A. Bailey🇰🇷 · Yong-Chull Jang🇺🇸 · Weonjong Lee🇰🇷 · Jaehoon Leem (LANL-SWME Collaboration)🇰🇷

    The CKM matrix element $|V_{cb}|$ can be extracted by combining data from experiments with lattice QCD results for the semileptonic form factors for the $\bar{B}\to D^{(\ast )}\ell \bar{\nu }$ decays. The Oktay-Kronfeld (OK) action was designed to reduce heavy-quark discretization errors to below $1\%$, or through $\mathcal{O}({\lambda }^3)$ in HQET power counting. Here we describe recent progress on bottom-to-charm currents improved to the same order in HQET as the OK action, and correct formerly reported results of our matching calculations, in which the operator basis was incomplete.

    ↳ hep-lathep-phEPJ Web Conf.(2018)·10 citations
41. 41*

    Calculation of $\bar{B}\to D^{\ast }\ell \bar{\nu }$ form factor at zero recoil using the Oktay-Kronfeld action

    Jon A. Bailey🇰🇷 · Tanmoy Bhattacharya🇺🇸 · Rajan Gupta🇺🇸 · Yong-Chull Jang🇺🇸 · Weonjong Lee🇰🇷 · Jaehoon Leem🇰🇷 · Sungwoo Park🇰🇷 · Boram Yoon (LANL-SWME Collaboration)🇺🇸

    We present the first preliminary results for the semileptonic form factor $h_{A_1}(w=1)/{\rho }_{A_j}$ at zero recoil for the $\bar{B}\to D^{\ast }\ell \bar{\nu }$ decay using lattice QCD with four flavors of sea quarks. We use the HISQ staggered action for the light valence and sea quarks (the MILC HISQ configurations), and the Oktay-Kronfeld (OK) action for the heavy valence quarks.

    ↳ hep-lathep-phEPJ Web Conf.(2018)·23 citations
42. 42*

    Baryon number violation and novel canonical anti-commutation relations

    Kazuo Fujikawa🇯🇵 · Anca Tureanu🇫🇮

    The possible neutron-antineutron oscillation is described by an effective quadratic Lagrangian analogous to the BCS theory. It is shown that the conventional equal-time anti-commutation relations of the neutron variable $n(t,\vec{x})$ are modified by the baryon number violating terms. This is established by the Bjorken--Johnson--Low prescription and also by the canonical quantization combined with equations of motion. This novel canonical behavior can give rise to an important physical effect, which is illustrated by analyzing the Lagrangian that violates the baryon number but gives rise to the degenerate effective Majorana fermions and thus no neutron-antineutron oscillation. Technically, this model is neatly treated using a relativistic analogue of the Bogoliubov transformation.

    ↳ hep-thhep-phPLB(2018)·3 citations
43. 43*

    Search for flavour-changing neutral currents with top quarks

    Kirill Skovpen (on behalf of the ATLAS and CMS Collaborations)🇧🇪

    Flavour-changing neutral currents are extremely rare processes in the standard model that can be sensitive to various new physics effects. The summary of the latest experimental results from the LHC experiments is given. Preliminary results of sensitivity studies for future colliders are also discussed.

    ↳ hep-exhep-ph2 citations
44. 44*

    Observation of deconfinement in a cold dense quark medium

    V. G. Bornyakov🇷🇺 · V. V. Braguta🇷🇺 · E.-M. Ilgenfritz🇷🇺 · A. Yu. Kotov🇷🇺 · A. V. Molochkov🇷🇺 · A. A. Nikolaev🇷🇺

    In this paper we study the confinement/deconfinement transition in lattice $SU(2)$ QCD at finite quark density and zero temperature. The simulations are performed on an $32^4$ lattice with rooted staggered fermions at a lattice spacing $a=0.044\mathrm{fm}$. This small lattice spacing allowed us to reach very large baryon density (up to quark chemical potential ${\mu }_q>2000\mathrm{MeV}$) avoiding strong lattice artifacts. In the region ${\mu }_q\sim 1000\mathrm{MeV}$ we observe for the first time the confinement/deconfinement transition which manifests itself in rising of the Polyakov loop and vanishing of the string tension $\sigma$. After the deconfinement is achieved at ${\mu }_q>1000\mathrm{MeV}$, we observe a monotonous decrease of the spatial string tension ${\sigma }_s$ which ends up with ${\sigma }_s$ vanishing at ${\mu }_q>2000\mathrm{MeV}$. From this observation we draw the conclusion that the confinement/deconfinement transition at finite density and zero temperature is quite different from that at finite temperature and zero density. Our results indicate that in very dense matter the quark-gluon plasma is in essence a weakly interacting gas of quarks and gluons without a magnetic screening mass in the system, sharply different from a quark-gluon plasma at large temperature.

    ↳ hep-lathep-phhep-thnucl-thJHEP(2018)·41 citations
45. 45*

    A long-lived remnant neutron star after GW170817 inferred from its associated kilonova

    Yun-Wei Yu🇨🇳 · Liang-Duan Liu🇨🇳 · Zi-Gao Dai🇨🇳

    The successful joint observation of the gravitational wave event GW170817 and its multi-wavelength electromagnetic counterparts first enables human to witness a definite merger event of two neutron stars (NSs). This historical event confirms the origin of short-duration gamma-ray bursts (GRBs), and in particular, identifies the theoretically-predicted kilonova phenomenon that is powered by radioactive decays of $r$-process heavy elements. However, whether a long-lived remnant NS could be formed during this merger event remains unknown, although such a central engine has been suggested by afterglow observations of some short-duration GRBs. By invoking this long-lived remnant NS, we here propose a model of hybrid energy sources for the kilonova AT2017gfo associated with GW 170817. While the early emission of AT2017gfo is still powered radioactively as usually suggested, its late emission is primarily caused by delayed energy injection from the remnant NS. In our model, only one single opacity is required and an intermediate value of $\kappa \simeq 0.97\mathrm{c}{\mathrm{m}}^2{\mathrm{g}}^{-1}$ is revealed, which could be naturally provided by lanthanide-rich ejecta that is deeply ionized by the emission from a wind of the NS. These self-consistent results indicate that a long-lived remnant NS, which must own a very stiff equation of state, had been formed during the merger event of GW170817. This provides a very stringent constraint on the strong interaction in nuclear-quark matter. It is further implied that such GW events could provide a probe of the early spin and magnetic evolutions of NSs, e.g., the burying of surface magnetic fields.

    ↳ astro-ph.HEastro-ph.SRhep-phnucl-thApJ(2018)·147 citations
46. 46*

    Measurements of spin alignment of vector mesons and global polarization of hyperons with ALICE at the LHC

    Bedangadas Mohanty (for the ALICE Collaboration)🇮🇳

    We present the measurements related to global polarization of $\Lambda$ hyperons and spin alignment of ${\mathrm{K}}^{\ast 0}$ vector mesons at mid-rapidity for Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$= 2.76 TeV using the ALICE detector at the LHC. The global polarization measurements are carried out with respect to the first order event plane while the spin alignment measurements are carried out with respect to the production plane. No global polarization signal for $\Lambda$ is observed for 5-15\% and 15-50\% central Pb-Pb collisions. The spin density matrix element ${\rho }_{00}$ is found to have values slightly below 1/3 at low transverse momentum ($p_{\mathrm{T}}$) for ${\mathrm{K}}^{\ast 0}$ mesons, while it is consistent with 1/3 (no spin alignment) at higher $p_{\mathrm{T}}$. No spin alignment is observed for ${\mathrm{K}}^{\ast 0}$ in pp collisions at $\sqrt{s}$ = 13 TeV and for the spin zero hadron ${\mathrm{K}}_{\mathrm{S}}^0$ in 20-40\% Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV.

    ↳ nucl-exhep-exhep-phnucl-thEPJ Web Conf.(2018)·19 citations
47. 47*

    Probing Velocity Dependent Self-Interacting Dark Matter with Neutrino Telescopes

    Denis S. Robertson🇧🇷 · Ivone F.M. Albuquerque🇧🇷

    Self-interacting dark matter models constitute an attractive solution to problems in structure formation on small scales. A simple realization of these models considers the dark force mediated by a light particle which can couple to the Standard Model through mixings with the photon or the $Z$ boson. Within this scenario we investigate the sensitivity of the IceCube-DeepCore and PINGU neutrino telescopes to the associated muon neutrino flux produced by dark matter annihilations in the Sun. Despite the model's simplicity, several effects naturally appear: momentum suppressed capture by nuclei, velocity dependent dark matter self-capture, Sommerfeld enhanced annihilation, as well as the enhancement on the neutrino flux due to mediator late decays. Taking all these effects into account, we find that most of the model relevant parameter space can be tested by the three years of data already collected by the IceCube-DeepCore. We show that indirect detection through neutrinos can compete with the strong existing limits from direct detection experiments, specially in the case of isospin violation.

    ↳ astro-ph.COhep-exhep-phJCAP(2018)·13 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.