Wed·Mar 20, 2019Wednesday·March 20, 2019

1. 01*

   Has AMS-02 Observed Two-Component Dark Matter?

   Stefano Profumo🇺🇸 · Farinaldo Queiroz🇧🇷 · Clarissa Siqueira🇧🇷

   There is convincing observational evidence for an increasing cosmic-ray positron-to-electron ratio at energies larger than $\sim 10$~GeV, at odds with expectations from secondary positron production. The most recent AMS-02 data exhibit an interesting spectral feature consisting of a bump at an energy around $300$~GeV followed by a drop around $\sim 800$~GeV. A possible explanation to the most recent data is that the excess positron originates from decaying dark matter. Here, we show that models consisting of two dark matter particle species contributing equally to the global cosmological dark matter density provide strikingly good fits to the data. The favored models, with a best-fit with ${\chi }^2/d.o.f\sim 0.5$ consist of a first species weighing $750$~GeV decaying with a lifetime ${\tau }_{\chi }\sim 10^{26}$~s to $\tau$ lepton pairs (or to a pair of vector bosons subsequently decaying to a $\tau$ pair each), and a second species with a mass around 2.3 TeV decaying to $\mu$ lepton pairs. We provide a few possible concrete realizations for this scenario.

   hep-phastro-ph.HEJ.Phys.G(2020)·17 citations
2. 02*

   Multi-quark matrix elements in the proton and three gluon exchange for exclusive ${\eta }_c$ production in photon-proton diffractive scattering

   Adrian Dumitru🇺🇸 · Tomasz Stebel🇵🇱

   Exclusive production of a ${\eta }_c$ pseudo-scalar meson in ${\gamma }^{(\ast )}+p\to {\eta }_c+p$ scattering at high energies involves a $\mathcal{C}$-odd exchange in the $t$-channel. We formulate the description of this process within the high-energy framework of eikonal dipole scattering. We obtain expressions for the light-cone wave function of the ${\eta }_c$ required in this framework as well as for the $\mathcal{C}$-odd amplitudes due to exchange of a single photon, of a photon plus two gluons, and of three gluons. We relate these amplitudes to correlators of the $+$ component of the quark current in the light-cone wave function of the proton. For high transverse momenta these correlators correspond to Generalized Parton Distributions (GPDs) given by diagrams where all exchanged gauge bosons attach to a single quark in the proton. Diagrams involving multi-quark matrix elements potentially sensitive to correlations, screen infrared singularities. Moreover, they are numerically important for configurations where the exchanged bosons nearly share the total momentum transfer. Using two simple models for the three quark Fock state of the proton at $x\simeq 0.1$, we find that single photon exchange dominates for $|t|<1.5$~GeV${}^2$. Here, the quark GPD could be measured cleanly in ${\gamma }^{(\ast )}+p\to {\eta }_c+p$ via single photon exchange. For higher momentum transfer three gluon (`Odderon') exchange is dominant.

   hep-phPRD(2019)·38 citations
3. 03*

   The $\hat{H}$-Parameter: An Oblique Higgs View

   Christoph Englert🇬🇧 · Gian F. Giudice🇨🇭 · Admir Greljo🇨🇭 · Matthew McCullough🇨🇭

   We study, from theoretical and phenomenological angles, the Higgs boson oblique parameter $\hat{H}$, as the hallmark of off-shell Higgs physics. $\hat{H}$ is defined as the Wilson coefficient of the sole dimension-6 operator that modifies the Higgs boson propagator, within a Universal EFT. Theoretically, we describe self-consistency conditions on Wilson coefficients, derived from the Källén-Lehmann representation. Phenomenologically, we demonstrate that the process $gg\to h^{\ast }\to VV$ is insensitive to propagator corrections from $\hat{H}$, and instead advertise four-top production as an effective high-energy probe of off-shell Higgs behaviour, crucial to break flat directions in the EFT.

   hep-phJHEP(2019)·74 citations
4. 04*

   Combined search for light dark matter with electron and muon beams at NA64

   S.N. Gninenko🇷🇺 · D.V. Kirpichnikov🇷🇺 · M.M. Kirsanov🇷🇺 · N.V. Krasnikov🇷🇺

   We discuss prospects of searching for a dark photon ($A^{\prime }$) which serves as mediator between Standard model (SM) particles and light dark matter (LDM) by using the combined results from the NA64 experiment at the CERN SPS running in high-energy electron (NA64e) and muon (NA64$\mu$) modes. We discuss the most natural values and upper bounds on the $A^{\prime }$ coupling constant to LDM and show they are lying in the range accessible at NA64. While for the projected $5\times 10^{12}$ electrons on target (EOT) NA64e is able to probe the scalar and Majorana LDM scenarios, the combined NA64e and NA64$\mu$ results with $\simeq 10^{13}$ EOT and a few $10^{13}$ MOT, respectively, will allow covering significant region in the parameter space of the most interesting LDM models. This makes NA64e and NA64$\mu$ extremely complementary to each other and increases significantly the discovery potential of sub-GeV DM.

   hep-phPLB(2019)·62 citations
5. 05*

   New constraint from supernova explosions on light particles beyond the Standard Model

   Allan Sung🇹🇼 · Huitzu Tu🇹🇼 · Meng-Ru Wu🇹🇼

   We propose a new constraint on light (sub-GeV) particles beyond the Standard Model that can be produced inside the proto-neutron star core resulting from the core-collapse supernova explosion. It is derived by demanding that the energy carried by exotic particles being transferred to the progenitor stellar envelopes must not exceed the explosion energy of $\lesssim 2\cdot 10^{51}$ erg of observed supernovae. We show specifically that for the case of a dark photon which kinetically mixes with the SM photon and decays predominantly to an $e^{\pm }$ pair, a smaller mixing parameter of one order of magnitude below the well-established supernova cooling bound can be excluded. Furthermore, our bound fills the gap between the cooling bound and the region constrained by (non)observation of gamma rays produced from supernovae for dark photons lighter than ~ 20 MeV. Our result also rules out the possibility of aiding successful supernova explosions by transferring energy from the supernova core to the shock with exotic particles.

   hep-phastro-ph.HEPRD(2019)·93 citations
6. 06*

   Proton scalar dipole polarizabilities from real Compton scattering data, using fixed-t subtracted dispersion relations and the bootstrap method

   B. Pasquini (Pavia U. & INFN, Pavia)🇮🇹 · P. Pedroni (INFN, Pavia)🇮🇹 · S. Sconfietti (Pavia U. & INFN, Pavia)🇮🇹

   We perform a fit of the real Compton scattering (RCS) data below pion-production threshold to extract the electric (${\alpha }_{E1}$) and magnetic (${\beta }_{M1}$) static scalar dipole polarizabilities of the proton, using fixed-$t$ subtracted dispersion relations and a bootstrap-based fitting technique. The bootstrap method provides a convenient tool to include the effects of the systematic errors on the best values of ${\alpha }_{E1}$ and ${\beta }_{M1}$ and to propagate the statistical errors of the model parameters fixed by other measurements. We also implement various statistical tests to investigate the consistency of the available RCS data sets below pion-production threshold and we conclude that there are not strong motivations to exclude any data point from the global set. Our analysis yields ${\alpha }_{E1}=(12.03_{-0.54}^{+0.48})\times 10^{-4}{\text{fm}}^3$ and ${\beta }_{M1}=(1.77_{-0.54}^{+0.52})\times 10^{-4}{\text{fm}}^3$, with p-value $=12\%$.

   hep-phnucl-exnucl-thJ.Phys.G(2019)·29 citations
7. 07*

   Toward a First-Principles Calculation of Electroweak Box Diagrams

   Chien-Yeah Seng🇩🇪 · Ulf-G. Meißner🇩🇪

   We derive a Feynman-Hellmann theorem relating the second-order nucleon energy shift resulting from the introduction of periodic source terms of electromagnetic and isovector axial currents to the parity-odd nucleon structure function $F_3^N$. It is a crucial ingredient in the theoretical study of the $\gamma W$ and $\gamma Z$ box diagrams that are known to suffer from large hadronic uncertainties. We demonstrate that for a given $Q^2$, one only needs to compute a small number of energy shifts in order to obtain the required inputs for the box diagrams. Future lattice calculations based on this approach may shed new light on various topics in precision physics including the refined determination of the Cabibbo-Kobayashi-Maskawa matrix elements and the weak mixing angle.

   hep-phhep-exhep-latnucl-ex+1PRL(2019)·36 citations
8. 08*

   Transport coefficients from in medium quarkonium dynamics

   Nora Brambilla🇩🇪 · Miguel A. Escobedo🇪🇸 · Antonio Vairo🇩🇪 · Peter Vander Griend🇩🇪

   The in medium dynamics of heavy particles are governed by transport coefficients. The heavy quark momentum diffusion coefficient, $\kappa$, is an object of special interest in the literature, but one which has proven notoriously difficult to estimate, despite the fact that it has been computed by weak-coupling methods at next-to-leading order accuracy, and by lattice simulations of the pure SU(3) gauge theory. Another coefficient, $\gamma$, has been recently identified. It can be understood as the dispersive counterpart of $\kappa$. Little is known about $\gamma$. Both $\kappa$ and $\gamma$ are, however, of foremost importance in heavy quarkonium physics as they entirely determine the in and out of equilibrium dynamics of quarkonium in a medium, if the evolution of the density matrix is Markovian, and the motion, quantum Brownian; the medium could be a strongly or weakly coupled plasma. In this paper, using the relation between $\kappa$, $\gamma$ and the quarkonium in medium width and mass shift respectively, we evaluate the two coefficients from existing 2+1 flavor lattice QCD data. The resulting range for $\kappa$ is consistent with earlier determinations, the one for $\gamma$ is the first non-perturbative determination of this quantity.

   hep-phhep-lathep-thnucl-thPRD(2019)·77 citations
9. 09*

   Thermal Heavy Quark Self-Energy from Euclidean Correlators

   Alexander M. Eller🇩🇪 · Jacopo Ghiglieri🇨🇭 · Guy D. Moore🇩🇪

   Brambilla, Escobedo, Soto, and Vairo have derived an effective description of quarkonium with two parameters; a momentum diffusion term and a real self-energy term. We point out that there is a similar real self-energy term for a single open heavy flavor and that it can be expressed directly in terms of Euclidean electric field correlators along a Polyakov line. This quantity can be directly studied on the lattice without the need for analytical continuation. We show that Minkowski-space calculations of this correlator correspond with the known NLO Euclidean value of the relevant electric field two-point function and that it differs from the real self-energy term for quarkonium.

   hep-phhep-latnucl-thPRD(2019)·33 citations
10. 10*

    Triangle singularities in ${\bar{B}}^0\to {\chi }_{c1}{K}^{-}{\pi }^{+}$ relevant to $Z_1(4050)$ and $Z_2(4250)$

    Satoshi X. Nakamura (University of Science and Technology of China)🇨🇳

    $Z_1(4050)$ and $Z_2(4250)$ observed in ${\bar{B}}^0\to {\chi }_{c1}{K}^{-}{\pi }^{+}$ by the Belle Collaboration are candidates of charged charmonium-like states that minimally includes two quarks and two antiquarks. While $Z_1(4050)$ and $Z_2(4250)$ have been interpreted as tetraquark states previously, we propose a completely different scenario based on a kinematical effect called the triangle singularity. We demonstrate that the triangle singularities cause in the ${\chi }_{c1}{\pi }^{+}$ invariant mass distribution resonance-like bumps that fit very well the Belle data. If these bumps are simulated by the $Z_1(4050)$ and $Z_2(4250)$ resonance excitations, the spin-parity of them are predicted to be $1^{-}$ for $Z_1(4050)$ and $1^{+}$ or $1^{-}$ for $Z_2(4250)$. The bump corresponding to $Z_1(4050)$ has a highly asymmetric shape, which the Belle data exactly indicate. We show that the asymmetric shape originates from an interplay between the triangle singularity and the opening of the $X(3872){\pi }^{+}$ channel near the triangle-singularity energy. This characteristic lineshape could be used to discriminate different interpretations of $Z_1(4050)$. An interesting prediction from interpretting $Z_1(4050)$ and $Z_2(4250)$ as the triangle singularities is that similar bumps caused by the same mechanisms possibly appear also in ${\bar{B}}^0\to J/\psi K^{-}{\pi }^{+}$ data; the already observed $Z_c(4200)$ corresponds to $Z_2(4250)$ of $J^P=1^{+}$.

    hep-phhep-exnucl-thPRD(2019)·25 citations
11. 11*

    Probing the trilinear Higgs boson coupling in di-Higgs production at NLO QCD including parton shower effects

    G.Heinrich🇩🇪 · S.P.Jones🇨🇭 · M.Kerner🇨🇭 · G.Luisoni🇩🇪 · L.Scyboz🇩🇪

    We present results for Higgs boson pair production with variations of the trilinear Higgs boson self-coupling at next-to-leading order (NLO) in QCD including the full top quark mass dependence. Differential results at 14 TeV are presented, and we discuss the implications of anomalous trilinear couplings as well as differences between the PYTHIA 8.2 and HERWIG 7.1 parton showers in combination with POWHEG. The implementation of the NLO QCD calculation with variable Higgs boson self-coupling is made publicly available in the POWHEG-BOX-V2 Monte Carlo framework. A simple method for using the new implementation to study also variations of the top quark Yukawa coupling is described.

    hep-phJHEP(2019)·152 citations
12. 12*

    Lifetimes of Doubly Heavy Baryons ${\mathcal{B}}_{bb}$ and ${\mathcal{B}}_{bc}$

    Hai-Yang Cheng🇹🇼 · Fanrong Xu🇨🇳

    Lifetimes of the doubly heavy baryons ${\mathcal{B}}_{bb}$ and ${\mathcal{B}}_{bc}$ are analyzed within the framework of the heavy quark expansion (HQE). Lifetime differences arise from the spectator effects such as $W$-exchange and Pauli interference. For doubly bottom baryons, the lifetime pattern is $\tau ({\Omega }_{bb}^{-})\sim \tau ({\Xi }_{bb}^{-})>\tau ({\Xi }_{bb}^0)$. The ${\Xi }_{bb}^0$ baryon is shortest-lived owing to the $W$-exchange contribution, while ${\Xi }_{bb}^{-}$ and ${\Omega }_{bb}^{-}$ have similar lifetimes as they both receive contributions from destructive Pauli interference. We find the lifetime ratio $\tau ({\Xi }_{bb}^{-})/\tau ({\Xi }_{bb}^0)=1.26$\,. The large $W$-exchange contribution to ${\Xi }_{bc}^0$ through the subprocess $cd\to us\to cd$ and the sizable destructive Pauli interference contribution to ${\Xi }_{bc}^{+}$ imply a substantial lifetime difference between ${\Xi }_{bc}^{+}$ and ${\Xi }_{bc}^0$. In the presence of subleading $1/m_c$ and $1/m_b$ corrections to the spectator effects, we find that $\tau ({\Omega }_{bc}^0)$ becomes longest-lived. This is because ${\Gamma }_{+}^{\mathrm{int}}$ and ${\Gamma }^{\mathrm{semi}}$ for ${\Omega }_{bc}^0$ are subject to large cancellation between dimension-6 and -7 operators. This implies that the subleading corrections are too large to justify the validity of the HQE. Demanding that ${\Gamma }_{\mathrm{int}+}^{cs}({\Omega }_{bc}^0)$, ${\Gamma }_{\mathrm{int}}^{\mathrm{SL},cs}({\Omega }_{bc}^0)$ be positive and ${\Gamma }_{\mathrm{int}-}^{cu}({\Xi }_{bc}^{+})$ be negative, we conjecture that $1.68\times 10^{-13}s<\tau ({\Omega }_{bc}^0)<3.70\times 10^{-13}s$ , $4.09\times 10^{-13}s<\tau ({\Xi }_{bc}^{+})<6.07\times 10^{-13}s$ and $0.93\times 10^{-13}s<\tau ({\Xi }_{bc}^0)<1.18\times 10^{-13}s$. Hence, the lifetime hierarchy of ${\mathcal{B}}_{bc}$ baryons is expected to be the pattern $\tau ({\Xi }_{bc}^{+})>\tau ({\Omega }_{bc}^0)>\tau ({\Xi }_{bc}^0)$.

    hep-phhep-exPRD(2019)·21 citations
13. 13*

    Perturbative QCD for $J/\psi$ Inclusive Production Via Initial State Radiation at $e^{+}{e}^{-}$ collider

    Bin Gong🇨🇳 · Yu-Dong Wang🇨🇳 · Jian-Xiong Wang🇨🇳

    Up to the next-leading order (NLO) of quantum chromodynamics (QCD), the process $e^{+}{e}^{-}\to J/\psi +X$ with the center-of-mass (CM) energy range from 3.7 to 10.6 GeV is calculated. At 10.6 GeV, the results is consistent with the experiment results at the Belle. However, the predictions are much smaller than the measurement at BESIII at low CM energy range from 3.7 to 4.6 GeV. This indicates that the convergence of QCD perturbative expansion becomes worse as the CM energy becomes lower and closer to the inclusive $J/\psi$ production threshold. For a further study of the QCD mechanism on $J/\psi$ production at $e^{+}{e}^{-}$ collider with different CM energy, the initial state radiation effect of $e^{+}{e}^{-}\to J/\psi +gg$ and $e^{+}{e}^{-}\to J/\psi +c\bar{c}$ are calculated at the QCD NLO. The results are plotted and the numbers of events for different CM energy bins are provided for the designed SuperKEKB. This provides a method to precisely test the validity of perturbative prediction on $J/\psi$ production in future measurements.

    hep-phCPC(2019)·4 citations
14. 14*

    A higher-dimensional Lagrangian representation of bi-cylindrical dynamical geometry for the mass-hierarchy problem of charged leptons

    Vo Van Thuan🇻🇳

    According to our microscopic cosmological model, masses of charged leptons can be calculated by curvatures of hyper-spherical surfaces embedded in a 3D time-like subspace. In this study, a higher-dimensional Lagrangian representation is applied to the bi-cylindrical dynamical geometry. A four-component scalar field is assumed to serve as the gauge transformers in the linearly factorized 4D space-time for inducing lepton mass. The consistency of the general relativity approach with quantum field theories is discussed.

    hep-phhep-th0 citations
15. 15*

    The JETSCAPE framework

    J. H. Putschke🇺🇸 · K. Kauder🇺🇸 · E. Khalaj🇺🇸 · A. Angerami🇺🇸 · S. A. Bass🇺🇸 · S. Cao🇺🇸 · J. Coleman🇺🇸 · L. Cunqueiro🇺🇸 · T. Dai🇺🇸 · L. Du🇺🇸 · H. Elfner🇩🇪 · D. Everett🇺🇸 and 33 other authors

    The JETSCAPE simulation framework is an overarching computational envelope for developing complete event generators for heavy-ion collisions. It allows for modular incorporation of a wide variety of existing and future software that simulates different aspects of a heavy-ion collision. The default JETSCAPE package contains both the framework, and an entire set of indigenous and third party routines that can be used to directly compare with experimental data. In this article, we outline the algorithmic design of the JETSCAPE framework, define the interfaces and describe the default modules required to carry out full simulations of heavy-ion collisions within this package. We begin with a description of the various physics elements required to simulate an entire event in a heavy-ion collision, and distribute these within a flowchart representing the event generator and statistical routines for comparison with data. This is followed by a description of the abstract class structure, with associated members and functions required for this flowchart to work. We then define the interface that will be required for external users of JETSCAPE to incorporate their code within this framework and to modify existing elements within the default distribution. We conclude with a discussion of some of the physics output for both $p$-$p$ and $A$-$A$ collisions from the default distribution, and an outlook towards future releases. In the appendix, we discuss various architectures on which this code can be run and outline our benchmarks on similar hardware.

    ↳ nucl-thhep-phnucl-ex193 citations
16. 16*

    Aspects of quantum gravity

    Andreas G. A. Pithis🇬🇧

    For more than 80 years theoretical physicists have been trying to develop a theory of quantum gravity which would successfully combine the tenets of Einstein's theory of general relativity (GR) together with those of quantum field theory. At the current stage, there are various competing responses to this challenge under construction. Attacking the problem of quantum gravity from the quantum geometry perspective, where space and spacetime are discrete, the focus of this thesis lies on the application of loop quantum gravity (LQG) and group field theory (GFT). We employ these two closely related nonperturbative approaches to two areas where quantum gravity effects are broadly expected to be relevant: black holes and quantum cosmology. Concerning black holes, apart from understanding their inner structure, a pressing issue is to give a microscopic explanation for the phenomenon of black hole entropy in terms of a discrete quantum geometry and relate it to the symmetries of the horizon. Black hole models in LQG are typically constructed via the isolated horizon boundary condition which gives rise to an effective description of the horizon geometry in terms SU(2) Chern-Simons theory. In this thesis we find a reinterpretation of the statistics of the horizon degrees of freedom as those of a system of non-Abelian anyons. As regards quantum cosmology, the challenge is to understand how the initial singularity problem of GR can be resolved by means of the discreteness of geometry and how a continuum spacetime can emerge from a large assembly of geometric building blocks. Most recent research in GFT aims at deriving the effective dynamics for condensate states directly from the microscopic GFT quantum dynamics and subsequently to extract a cosmological interpretation from them. In this thesis we elaborate on aspects of this approach and study phenomenological consequences in detail.

    ↳ gr-qchep-phhep-thmath-ph+16 citations
17. 17*

    Visualizations of Centre Vortex Structure in Lattice Simulations

    James C. Biddle🇦🇺 · Waseem Kamleh🇦🇺 · Derek B. Leinweber (University of Adelaide)🇦🇺

    The structure of centre vortices in SU(3) gauge-field configurations is examined through modern visualization techniques. Centre vortices are identified through gauge transformations maximizing the centre of the gauge group. Focusing on the thin vortices identified by Wilson loops having a non-trivial centre phase, the vortex structure is illustrated through renderings of oriented spatial plaquettes. Time oriented plaquettes are illustrated by identifying spatial links associated with these non-trivial plaquettes. The results illustrate an important role for the branching of SU(3) centre vortices, possibly through monopole anti-monopole dynamics. Of particular interest is the correlation of the vortex structure and the topological-charge structure of the gauge fields, vital to dynamical chiral symmetry breaking and its associated mass generation. Singular points, where the projected vortex structure contains non-trivial centre phases in associated plaquettes spanning all four dimensions, are observed within the regions of nontrivial topological charge density calculated on the original Monte-Carlo generated configurations. The results provide new insights into the role of centre vortices in underpinning non-trivial topology in gauge fields. They reveal how the removal of centre-vortices necessarily destroys non-trivial topology and destabilizes would-be instantons under smoothing algorithms. The observed correlations further strengthen the idea that centre vortices are the seeds of dynamical chiral symmetry breaking.

    ↳ hep-lathep-phhep-thPoS(2018)·9 citations
18. 18*

    A Pattern for the Flavor Dependence of the Quark-Gluon Interaction

    Muyang Chen🇨🇳 · Lei Chang🇨🇳

    A flavor dependent kernel is constructed based on the rainbow-ladder truncation of the Dyson-Schwinger and Bethe-Salpeter equation approach of Quantum Chromodynamics. The quark-antiquark interaction is composed of a flavor dependent infrared part and a flavor independent ultraviolet part. Our model gives a successful and unified description of the light, heavy and heavy-light ground pseudoscalar and vector mesons. For the first time, our model shows that the infrared enhanced quark-antiquark interaction is stronger and wider for the lighter quark.

    ↳ nucl-thhep-phCPC(2019)·29 citations
19. 19*

    Light-cone distribution amplitudes of pseudoscalar mesons from lattice QCD

    Gunnar S. Bali🇩🇪 · Vladimir M. Braun🇩🇪 · Simon Bürger🇩🇪 · Meinulf Göckeler🇩🇪 · Michael Gruber🇩🇪 · Fabian Hutzler🇩🇪 · Piotr Korcyl🇵🇱 · Andreas Schäfer🇩🇪 · André Sternbeck🇩🇪 · Philipp Wein🇩🇪

    We present the first lattice determination of the two lowest Gegenbauer moments of the leading-twist pion and kaon light-cone distribution amplitudes with full control of all errors. The calculation is carried out on 35 different CLS ensembles with $N_f=2+1$ flavors of dynamical Wilson-clover fermions. These cover a multitude of pion and kaon mass combinations (including the physical point) and 5 different lattice spacings down to $a=0.039$fm. The momentum smearing technique and a new operator basis are employed to reduce statistical fluctuations and to improve the overlap with the ground states. The results are obtained from a combined chiral and continuum limit extrapolation that includes three separate trajectories in the quark mass plane. The present arXiv version (v3) includes an Addendum where we update the results using the recently calculated three-loop matching factors for the conversion from the RI'/SMOM to the $\overline{\text{MS}}$ scheme. We find $a_2^{\pi }=0.116_{-20}^{+19}$ for the pion, $a_1^K=0.0525_{-33}^{+31}$ and $a_2^K=0.106_{-16}^{+15}$ for the kaon. We also include the previous values, which were obtained with two-loop matching.

    ↳ hep-lathep-phJHEP(2019)·145 citations
20. 20*

    Particle-Set Identification method to study multiplicity fluctuations

    M. Gazdzicki🇵🇱 · M. I. Gorenstein🇺🇦 · M. Mackowiak-Pawlowska🇵🇱 · A. Rustamov🇦🇿

    In this paper a new method of experimental data analysis, the Particle-Set Identification method, is presented. The method allows to reconstruct moments of multiplicity distribution of identified particles. The difficulty the method copes with is due to incomplete particle identification -- a particle mass is frequently determined with a resolution which does not allow for a unique determination of the particle type. Within this method the moments of order $k$ are calculated from mean multiplicities of $k$-particle sets of a given type. The Particle-Set Identification method remains valid even in the case of correlations between mass measurements for different particles. This distinguishes it from the Identity method introduced by us previously to solve the problem of incomplete particle identification in studies of particle fluctuations.

    ↳ nucl-thhep-phnucl-exNPA(2020)·4 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.