HEP Phenomenology·hep-ph

Fri·Feb 1, 2019Friday·February 1, 2019

27 papers—14 primary·13 cross-listed·reconstructed*

01*
Secluded Dark Matter in light of the Cherenkov Telescope Array (CTA)
Clarissa Siqueira🇧🇷
Secluded dark matter is one of the most popular dark matter models, where dark matter annihilations go into particles that belong to a dark sector. An interesting way to probe such models is via indirect detection. In particular, gamma-ray observations are rather promising. Taking into account $1%$ level of systematics, in this work we show that the Cherenkov Telescope Array (CTA) will place the most stringent bounds on the dark matter annihilation cross section, surpassing existing probes based on H.E.S.S., Fermi-LAT, and Planck data, for dark matter masses above $400$ GeV, independently of the channel and choosing the Einasto profile. We consider scenarios of secluded annihilations into leptophilic, leptophobic scalars and Higgs-like particles being able to exclude an annihilation cross section of $1.7 \times 1 0^{- 25}$ cm $^{3}$ s $^{- 1}$ for $m_{D M} = 5000$ GeV, for $ϕ \to e^{+} e^{-}$ channel, for example, exceeding the current limits by one order of magnitude.
hep-phPLB(2019)·10 citations
02*
LHC SUSY and WIMP dark matter searches confront the string theory landscape
Howard Baer🇺🇸 · Vernon Barger🇺🇸 · Shadman Salam🇺🇸 · Hasan Serce🇺🇸 · Kuver Sinha🇺🇸
The string theory landscape of vacua solutions provides physicists with some understanding as to the magnitude of the cosmological constant. Similar reasoning can be applied to the magnitude of the soft SUSY breaking terms in supersymmetric models of particle physics: there appears to be a statistical draw towards large soft terms which is tempered by the anthropic requirement of the weak scale lying not too far from ~100 GeV. For a mild statistical draw of m_{soft}^n with n=1 (as expected from SUSY breaking due to a single F term) then the light Higgs mass is preferred at ~125 GeV while sparticles are all pulled beyond LHC bounds. We confront a variety of LHC and WIMP dark matter search limits with the statistical expectations from a fertile patch of string theory landscape. The end result is that LHC and WIMP dark matter detectors see exactly that which is expected from the string theory landscape: a Standard Model-like Higgs boson of mass 125 GeV but as yet no sign of sparticles or WIMP dark matter. SUSY from the n=1 landscape is most likely to emerge at LHC in the soft opposite-sign dilepton plus jet plus MET channel. Multi-ton noble liquid WIMP detectors should be able to completely explore the n=1 landscape parameter space.
hep-phastro-ph.COJHEP(2019)·22 citations
03*
The Isoscalar Mesons and Exotic States in Light Front Holographic QCD
Liping Zou🇨🇳 · Hans Günter Dosch🇩🇪 · Guy F. de Téramond🇨🇷 · Stanley J. Brodsky🇺🇸
In this article a systematic quantitative analysis of the isoscalar bosonic states is performed in the framework of supersymmetric light front holographic QCD. It is shown that the spectroscopy of the $η$ and $h$ mesons can be well described if one additional mass parameter -- which corresponds to the hard breaking of chiral $U (1)$ symmetry in standard QCD -- is introduced. The mass difference of the $η$ and $η^{'}$ isoscalar mesons is then determined by the strange quark mass content of the $η^{'}$ . The theory also predicts the existence of isoscalar tetraquarks which are bound states of diquarks and anti-diquarks. The candidates for these exotic isoscalar tetraquarks are identified. In particular, the $f_{0} (1500)$ is identified as isoscalar tetraquark; the predicted mass value 1.52 GeV agrees with the measured experimental value within the model uncertainties.
hep-phhep-lathep-thPRD(2019)·12 citations
04*
Neutrino mixings as a source of lepton flavor violations
O.M.Boyarkin🇧🇾 · G.G.Boyarkina🇧🇾 · D.S.Vasileuskaya🇧🇾
Within the left-right symmetric model (LRM) the $Z$ boson decay into the channel $Z \to τ μ$ are investigated. The branching ratios of this decay is found in the third order of the perturbation theory. The obtained expression does not equal to zero only at the existence of the neutrino mixings. It means that from the point of view of the LRM nonconservation both of neutral and of charged lepton flavors has the same nature. As a result, elucidation of the decays $Z \to \l_{i} l_{k}$ ( $i \neq = k$ ) could provide data concerned the neutrino sector structure of the LRM. The neutrino sector parameters which could be measured in that case are as follows: (i) difference of the heavy neutrino masses; (ii) heavy-heavy neutrino mixing; (iii) heavy-light neutrino mixing.
hep-phInt.J.Mod.Phys.A(2018)·0 citations
05*
Revealing minijet dynamics via centrality dependence of the double parton interactions in proton-nucleus interactions
Massimiliano Alvioli🇮🇹 · Maxim Azarkin🇷🇺 · Boris Blok🇮🇱 · Mark Strikman🇺🇸
One of the main challenges hampering an accurate measurement of the double parton scattering (DPS) cross sections is the difficulty in separating the DPS from the leading twist (LT) contributions. We argue that such a separation can be achieved, and cross section of DPS measured, by exploiting the different centrality dependence of DPS and LT processes in proton-nucleus scattering. We developed a Monte Carlo implementation of the DPS processes which includes realistic nucleon-nucleon (NN) correlations in nuclei, an accurate description of transverse geometry of both hard and soft NN collisions as well as fluctuations of the strength of interaction of nucleon with nucleus (color fluctuation effects). Our method allows the calculation of probability distributions of single and double dijet events as a function of centrality, also distinguishing double hard scatterings originating from a single target nucleon and from two different nucleons. We present numerical results for the rate of DPS as a function of centrality, which relates the number of wounded nucleons and the sum of transverse energy of hadrons produced at large negative (along the nucleus direction) rapidities, which is experimentally measurable. We suggest a new quantity which allows to test the geometry of DPS and we argue that it is a universal function of centrality for different DPS processes. This quantity can be tested by analyzing existing LHC data. The method developed in this work can be extended to the search for triple parton interactions.
hep-phnucl-thEPJC(2019)·15 citations
06*
Dark Matter Decaying into Millicharged Particles as a Solution to AMS 02 Positron Excess
Yasaman Farzan🇮🇷 · Meshkat Rajaee🇮🇷
The positron excess observed by PAMELA and then confirmed by AMS 02 has intrigued the particle physics community since 2008. Various dark matter decay and annihilation models have been built to explain the excess. However, the bounds from isotropic gamma ray disfavor the canonical dark matter decay scenario. We propose a solution to this excess based on the decay of dark matter particles into intermediate millicharged particles which can be trapped by the galactic magnetic field. The subsequent decay of the millicharged particles to electron positron in our vicinity can explain the excess. Since these particles diffuse out of halo before decay, their contribution to the isotropic gamma ray background is expected to be much smaller than that in canonic dark matter decay scenarios. We show that the model is testable by direct dark matter search experiments.
hep-phJCAP(2019)·16 citations
07*
Non-Unitarity at DUNE and T2HK with Charged and Neutral Current Measurements
Debajyoti Dutta🇮🇳 · Samiran Roy🇮🇳
Neutral current (NC) measurements play an important role in exploring new physics scenarios at long-baseline neutrino oscillation experiments. We find that combining NC measurements of the proposed Deep Underground Neutrino Experiment (DUNE) with its charged current (CC) measurements enhances the bounds on some of the Non-Unitarity (NU) parameters. Combining DUNE with the T2HK experiment improves the bounds further. We show that even in the averaged out regime of light sterile neutrinos, the NC events are different from the heavy sterile case in the leading order. It is observed that NC measurements at DUNE provide much better constraints on the $α_{33}$ parameter than the CC measurements.
hep-phJ.Phys.G(2021)·18 citations
08*
Relaxed constraints on the heavy scalar masses in 2HDM
Siddhartha Karmakar🇮🇳 · Subhendu Rakshit🇮🇳
In the wake of new scalar searches at LHC in various channels, it is interesting to investigate the sacrosanctity of the constraints on the masses and couplings of the heavier scalars in a two-Higgs-doublet model (2HDM). We consider the effects of new physics beyond a 2HDM encoded in terms of bosonic dim-6 operators. Although these constraints are mostly immune to such new physics, we demonstrate for a specific class of bosonic operators, the constraints on the masses of the exotic scalars from cascade decays can get substantially relaxed. We present such effects for both degenerate and hierarchical mass spectra of the heavier scalars in 2HDM. Some decay channels of the new scalars vanish at the alignment limit in the tree-level 2HDM. But the inclusion of dim-6 terms can lead to significant cross-sections for such processes. It is also pointed out that observation of such processes can no longer rule out the alignment limit if such dim-6 operators are present.
hep-phPRD(2019)·16 citations
09*
Hard exclusive processes involving kaons
P. Kroll🇩🇪
Hard exclusive electroproduction of kaons as well as the kaon-induced exclusive Drell-Yan process are investigated within the handbag approach which is based on factorization in hard subprocesses and soft generalized parton distributions (GPDs). The kaon-hyperon transition GPDs occurring here, are related to the proton GPDs by flavor symmetry. The latter ones are taken from analyses of pion electroproduction. Like in hard processes involving pions the transversity GPDs play an important role in the processes of interest - the transverse cross sections are larger than (or, for the Drell-Yan process, about equal to) the longitudinal ones. The evolution of the transversity GPDs is taken into account for the first time but, as the analysis reveals, it is a minor effect in the range of photon virtualities of interest. The predictions for the cross sections agree fairly well with the sparse available electroproduction data.
hep-phEPJA(2019)·10 citations
10*
Beyond basis invariants
Igor P. Ivanov🇵🇹 · Celso C. Nishi🇧🇷 · Andreas Trautner🇩🇪
Physical observables cannot depend on the basis one chooses to describe fields. Therefore, all physically relevant properties of a model are, in principle, expressible in terms of basis-invariant combinations of the parameters. However, in many cases it becomes prohibitively difficult to establish key physical features exclusively in terms of basis invariants. Here, we advocate an alternative route in such cases: the formulation of basis-invariant statements in terms of basis-covariant objects. We give several examples where the basis-covariant path is superior to the traditional approach in terms of basis invariants. In particular, this includes the formulation of necessary and sufficient basis-invariant conditions for various physically distinct forms of CP conservation in two- and three-Higgs-doublet models.
hep-phEPJC(2019)·19 citations
11*
The Mikheyev-Smirnov-Wolfenstein (MSW) Effect
A Y Smirnov🇩🇪
Developments of main notions and concepts behind the MSW effect (1978 - 1985) are described. They include (i) neutrino refraction, matter potential, and evolution equation in matter, (ii) mixing in matter, resonance and level crossing; (iii) adiabaticity condition and adiabatic propagation in matter with varying density. They are in the basis of the resonance enhancement of oscillations in matter with constant (nearly constant) density, and the adiabatic flavor conversion in matter with slowly changing density. The former is realized in matter of the Earth and can be used to establish neutrino mass hierarchy. The latter provides solution to the solar neutrino problem and play the key role in transformations of the supernova neutrinos.
hep-ph16 citations
12*
Central exclusive diffractive production of $K^{+} K^{-} K^{+} K^{-}$ via the intermediate $ϕϕ$ state in proton-proton collisions
Piotr Lebiedowicz🇵🇱 · Otto Nachtmann🇩🇪 · Antoni Szczurek🇵🇱
We present a study of the exclusive $pp \to pp K^{+} K^{-} K^{+} K^{-}$ reaction at high energies. We consider diffractive mechanisms with the intermediate $ϕϕ$ state with its decay into the $K^{+} K^{-} K^{+} K^{-}$ system. We include the $ϕ (1020)$ $t^/ u^$ -channel exchanges and the $f_{2} (2340)$ $s$ -channel exchange mechanism. This $f_{2}$ state is a candidate for a tensor glueball. We discuss the possibility to use the $pp \to ppϕϕ$ process in identifying the odderon exchange. An upper limit for the $PO ϕ$ coupling is extracted from the WA102 experimental data. The amplitudes for the processes are formulated within the tensor-pomeron and vector-odderon approach. We adjust parameters of our model to the WA102 data and present several predictions for the ALICE, ATLAS, CMS and LHCb experiments. Integrated cross sections of order of a few nb are obtained including the experimental cuts relevant for the LHC experiments. The distributions in the four-kaon invariant mass, rapidity distance between the two $ϕ$ mesons, special ``glueball filter variable'', proton-proton relative azimuthal angle are presented. The distribution in rapidity difference of both $ϕ$ -mesons could shed light on the $f_{2} (2340) \to ϕϕ$ coupling, not known at present. We discuss the possible role of the $f_{0} (2100)$ , $η (2225)$ , and $X (2500)$ resonances observed in the $ϕϕ$ channel in radiative decays of $J / ψ$ . Using typical kinematic cuts for LHC experiments we find from our model that the odderon-exchange contribution should be distinguishable from other contributions for large rapidity distance between the $ϕ$ mesons and in the region of large four-kaon invariant masses. At least, it should be possible to derive an upper limit on the odderon contribution in this reaction.
hep-phhep-exPRD(2019)·39 citations
13*
Decomposition of Feynman Integrals on the Maximal Cut by Intersection Numbers
Hjalte Frellesvig🇮🇹 · Federico Gasparotto🇮🇹 · Stefano Laporta🇮🇹 · Manoj K. Mandal🇮🇹 · Pierpaolo Mastrolia🇮🇹 · Luca Mattiazzi🇮🇹 · Sebastian Mizera🇨🇦
We elaborate on the recent idea of a direct decomposition of Feynman integrals onto a basis of master integrals on maximal cuts using intersection numbers. We begin by showing an application of the method to the derivation of contiguity relations for special functions, such as the Euler beta function, the Gauss $_{2} F_{1}$ hypergeometric function, and the Appell $F_{1}$ function. Then, we apply the new method to decompose Feynman integrals whose maximal cuts admit 1-form integral representations, including examples that have from two to an arbitrary number of loops, and/or from zero to an arbitrary number of legs. Direct constructions of differential equations and dimensional recurrence relations for Feynman integrals are also discussed. We present two novel approaches to decomposition-by-intersections in cases where the maximal cuts admit a 2-form integral representation, with a view towards the extension of the formalism to $n$ -form representations. The decomposition formulae computed through the use of intersection numbers are directly verified to agree with the ones obtained using integration-by-parts identities.
hep-phhep-thJHEP(2019)·200 citations
14*
Analysis of hidden-bottom bb\bar{b}\bar{b} states
Xiaoyun Chen🇨🇳
Motivated by the searching for $bb b ˉ b ˉ$ states at LHC recently, we calculate the ground-state energies of $bb b ˉ b ˉ$ states with quantum numbers $I J^{P} = 0 0^{+}, 0 1^{+}, 0 2^{+}$ in a nonrelativistic chiral quark model using the Gaussian expansion method. In our calculations, two structures, meson-meson and diquark-antidiquark, and their coupling, along with all possible color configurations are considered. It is expected that the studies shall be helpful for the experimental searching of fully-heavy exotic tetraquark states.
hep-phEPJA(2019)·40 citations
15*
Transmission coefficient of interacting few-body system in one dimensional space
Peng Guo🇺🇸 · Vladimir Gasparian🇺🇸
We present a novel way of defining transmission coefficient of one spatial dimensional few interacting electrons system. The formalism is based on the probability interpretation of unitarity of physical scattering $S$ -matrix. The relation of our formalism to the well-established method for describing the conducting properties of non-interacting systems, Landauer-Büttiker formula, is discussed. The transport properties of interacting two-electron system is also discussed as a specific example of our formalism.
↳ cond-mat.mes-hallhep-phPLA(2019)·0 citations
16*
Studies of granularity of a hadronic calorimeter for tens-of-TeV jets at a 100 TeV $pp$ collider
C.-H. Yeh🇹🇼 · S.V. Chekanov🇺🇸 · A.V. Kotwal🇺🇸 · J. Proudfoot🇺🇸 · S. Sen🇺🇸 · N.V. Tran🇺🇸 · S.-S. Yu🇹🇼
Jet substructure variables for hadronic jets with transverse momenta in the range from 2.5 TeV to 20 TeV were studied using several designs for the spatial size of calorimeter cells. The studies used the full Geant4 simulation of calorimeter response combined with realistic reconstruction of calorimeter clusters. In most cases, the results indicate that the performance of jet-substructure reconstruction improves with reducing cell size of a hadronic calorimeter from $Δ η \times Δ ϕ = 0.087 \times 0.087$ , which are similar to the cell sizes of the calorimeters of LHC experiments, by a factor of four, to $0.022 \times 0.022$ .
↳ physics.ins-dethep-exhep-phJINST(2019)·10 citations
17*
Large-scale inhomogeneity of dark energy produced in the ancestor vacuum
Yue Nan🇯🇵 · Kazuhiro Yamamoto🇯🇵 · Hajime Aoki🇯🇵 · Satoshi Iso🇯🇵 · Daisuke Yamauchi🇯🇵
We investigate large-scale inhomogeneity of dark energy in the bubble nucleation scenario of the universe. In this scenario, the present universe was created by a bubble nucleation due to quantum tunneling from a metastable ancestor vacuum, followed by a primordial inflationary era. During the bubble nucleation, supercurvature modes of some kind of a scalar field are produced, and remain until present without decaying; thus they can play a role of the dark energy, if the mass of the scalar field is sufficiently light in the present universe. The supercurvature modes fluctuate at a very large spatial scale, much longer than the Hubble length in the present universe. Thus they create large-scale inhomogeneities of the dark energy, and generate large-scale anisotropies in the cosmic microwave background (CMB) fluctuations. This is a notable feature of this scenario, where quantum fluctuations of a scalar field are responsible for the dark energy. In this paper, we calculate imprints of the scenario on the CMB anisotropies through the integrated Sachs-Wolfe (ISW) effect, and give observational constraints on the curvature parameter $Ω_{K}$ and on an additional parameter $ϵ$ describing some properties of the ancestor vacuum.
↳ astro-ph.COhep-phPRD(2019)·8 citations
18*
Dynamically Integrated Transport Approach for High-Energy Nuclear Collisions at High Baryon Density
Koichi Murase🇯🇵 · Yukinao Akamatsu🇯🇵 · Masayuki Asakawa🇯🇵 · Tetsufumi Hirano🇯🇵 · Masakiyo Kitazawa🇯🇵 · Kenji Morita🇵🇱 · Yasushi Nara🇯🇵 · Chiho Nonaka🇯🇵 · Akira Ohnishi🇯🇵
To explore the structure of the QCD phase diagram in high baryon density domain, several high-energy nuclear collision experiments in a wide range of beam energies are currently performed or planned using many accelerator facilities. In these experiments search for a first-order phase transition and the QCD critical point is one of the most important topics. To find the signature of the phase transition, experimental data should be compared to appropriate dynamical models which quantitatively describe the process of the collisions. In this study we develop a new dynamical model on the basis of the non-equilibrium hadronic transport model JAM and 3+1D hydrodynamics. We show that the new model reproduce well the experimental beam-energy dependence of hadron yields and particle ratio by the partial thermalization of the system in our core-corona approach.
↳ nucl-thhep-phnucl-exJPS Conf.Proc.(2019)·2 citations
19*
Probing QCD critical fluctuations from intermittency analysis in relativistic heavy-ion collisions
Jin Wu🇨🇳 · Yufu Lin🇨🇳 · Yuanfang Wu🇨🇳 · Zhiming Li🇨🇳
It is shown that intermittency, a self-similar correlation with respect to the size of the phase space volume, is sensitive to critical density fluctuations of baryon numbers in a system belonging to the three-dimensional (3D) Ising universality class. The relation between intermittency index and relative baryon density fluctuation is obtained. We thus suggest that measuring the intermittency in relativistic heavy-ion collisions could be used as a good probe of density fluctuations associated with the QCD critical phenomena. From recent preliminary results on neutron density fluctuations in central Au + Au collisions at $s_{N N}$ = 7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV at RHIC/STAR, the collision energy dependence of intermittency index is extracted and shows a non-monotonic behavior with a peak at around 20 - 27 GeV, indicating that the strength of intermittency becomes the largest in this energy region. The transport UrQMD model without implementing critical physics cannot describe the observed behavior.
↳ nucl-thhep-exhep-phnucl-exPLB(2020)·31 citations
20*
The BRST-invariant vacuum state of the Gribov-Zwanziger theory
D. Dudal🇧🇪 · C. P. Felix🇧🇪 · L. F. Palhares🇧🇷 · F. Rondeau🇧🇪 · D. Vercauteren🇻🇳
We revisit the effective action of the Gribov-Zwanziger theory, taking into due account the BRST symmetry and renormalization (group invariance) of the construction. We compute at one loop the effective potential, showing the emergence of BRST-invariant dimension 2 condensates stabilizing the vacuum. This paper sets the stage at zero temperature, and clears the way to studying the Gribov-Zwanziger gap equations, and particularly the horizon condition, at finite temperature in future work.
↳ hep-thhep-lathep-phEPJC(2019)·25 citations
21*
Equation of state of dense matter in the multimessenger era
Ying Zhou🇨🇳 · Lie-Wen Chen🇨🇳 · Zhen Zhang🇨🇳
While the equation of state (EOS) of symmetric nuclear matter (SNM) at suprasaturation densities has been relatively well constrained from heavy-ion collisions, the EOS of high-density neutron-rich matter is still largely uncertain due to the poorly known high-density behavior of the symmetry energy. Using the constraints on the EOS of SNM at suprasaturation densities from heavy-ion collisions together with the data of finite nuclei and the existence of $2 M_{⊙}$ neutron stars from electromagnetic (EM) observations, we show that the high-density symmetry energy cannot be too soft, which leads to lower bounds on dimensionless tidal deformability of $Λ_{1.4} \geq 193$ and radius of $R_{1.4} \geq 11.1$ km for $1.4 M_{⊙}$ neutron star. Furthermore, we find that the recent constraint of $Λ_{1.4} \leq 580$ from the gravitational wave signal GW170817 detected from the binary neutron star merger by the LIGO and Virgo Collaborations rules out too stiff high-density symmetry energy, leading to an upper limit of $R_{1.4} \leq 13.3$ km. All these terrestrial nuclear experiments and astrophysical observations based on strong, EM and gravitational measurements together put stringent constraints on the high-density symmetry energy and the EOS of SNM, pure neutron matter and neutron star matter.
↳ nucl-thastro-ph.HEastro-ph.SRhep-ph+1PRD(2019)·64 citations
22*
No hair theorem for spherically symmetric regular compact stars with Dirichlet boundary conditions
Yan Peng🇨🇳
We study scalar condensation in the background of asymptotically flat spherically symmetric regular Dirichlet stars. We assume that the scalar field decreases as the star surface is approached. Under these circumstances, we prove a no hair theorem for neutral regular compact stars. We also extend the discussion to charged regular compact stars and find an upper bound for the charged star radius. Above the upper bound, the scalar hair cannot exist. Below the upper bound, we numerically obtain solutions of scalar hairy charged stars.
↳ gr-qchep-phhep-thPLB(2019)·10 citations
23*
Parton Distribution Functions from a Light Front Hamiltonian and QCD Evolution for Light Mesons
Jiangshan Lan🇨🇳 · Chandan Mondal🇨🇳 · Shaoyang Jia🇺🇸 · Xingbo Zhao🇨🇳 · James P. Vary🇺🇸
We obtain the pion and the kaon parton distribution functions from the eigenstates of a light front effective Hamiltonian in the constituent quark-antiquark representation suitable for low-momentum scale applications. By taking these scales as the only free parameters, the valence quark distribution functions of the pion, after QCD evolution, are consistent with the data from the FNAL-E615 experiment. The ratio of the up quark distribution of the kaon to that of the pion also agrees with the CERN-NA3 experiment. Supplemented by known parton distribution functions for the nucleons, we further obtain the cross section consistent with experimental data for the $π^{-} nucleus \to μ^{+} μ^{-} X$ Drell-Yan process.
↳ nucl-thhep-phPRL(2019)·132 citations
24*
Unitarity bounds on charged/neutral state mass ratio
Wei-Ming Chen🇹🇼 · Yu-tin Huang🇹🇼 · Toshifumi Noumi🇯🇵 · Congkao Wen🇬🇧
In this letter, we study the implications of unitary completion of quantum gravity on the low energy spectrums, through an infinite set of unitarity bounds on the forward-limit scattering amplitudes. In three dimensions, we find that light states with charge-to-mass ratio $z$ greater than $1$ can only be consistent if there exists other light states, preferably neutral. Applied to the compactification of the Standard Model, where the low energy couplings are dominated by the electron with $∣ z ∣ \sim 1 0^{22}$ , this provides a novel understanding of the need for light neutrinos.
↳ hep-thgr-qchep-exhep-ph+2PRD(2019)·47 citations
25*
Top2018: Experimental Summary
Mark Owen🇬🇧
Top quark physics continues to be an exciting and fast moving research area. The large statistics provided by the LHC are allowing us to measure processes never observed before and to develop new methods to improve the precision for the "bread-and-butter" measurements. Summarising more than thirty talks in a concise way is something of a challenge and hence this document is my own personal biased selection of the many interesting results that were discussed at the workshop.
↳ hep-exhep-ph1 citation
26*
JIMWLK evolution and small-x asymptotics of 2n-tuple Wilson line correlators
Khatiza Banu🇮🇳 · Mariyah Siddiqah🇮🇳 · Raktim Abir🇮🇳
JIMWLK equation tells how gauge invariant higher order Wilson line correlators would evolve at high energy. In this article we present a convenient integro-differential form of this equation, for 2n-tuple correlator, where all real and virtual terms are explicit. The `real' terms correspond to splitting (say at position z) of this 2n-tuple correlator to various pairs of 2m-tuple and (2n+2-2m)-tuple correlators whereas `virtual' terms correspond to splitting into pairs of 2m-tuple and (2n-2m)-tuple correlators. Kernels of virtual terms with m=0 (no splitting) and of real terms with m=1 (splitting with atleast one dipole) have poles and when integrated over z they do generate ultraviolet logarithmic divergences, separately for real and virtual terms. Except these two cases in all other terms the corresponding kernels, separately for real and virtual terms, have rather soften ultraviolet singularity and when integrated over z do not generate ultraviolet logarithmic divergences. We went on to study the solution of the JIMWLK equation for the 2n-tuple Wilson line correlator in the strong scattering regime where all transverse distances are much larger than inverse saturation momentum and shown that it also exhibits geometric scaling like color dipole deep inside saturation region.
↳ hep-thhep-lathep-phnucl-thPRD(2019)·3 citations
27*
Spectrum of light- and heavy-baryons
Si-Xue Qin🇨🇳 · Craig D. Roberts🇺🇸 · Sebastian M. Schmidt🇩🇪
A symmetry-preserving truncation of the strong-interaction bound-state equations is used to calculate the spectrum of ground-state $J = 1/ 2^{+}$ , $3/ 2^{+}$ $(q q^{'} q^{''})$ -baryons, where $q, q^{'}, q^{''} \in {u, d, s, c, b}$ , their first positive-parity excitations and parity partners. Using two parameters, a description of the known spectrum of 39 such states is obtained, with a mean-absolute-relative-difference between calculation and experiment of 3.6(2.7)%. From this foundation, the framework is subsequently used to predict the masses of 90 states not yet seen empirically.
↳ nucl-thhep-exhep-lathep-ph+1Few Body Syst.(2019)·123 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.