HEP Phenomenology·hep-ph

Tue·Jan 2, 2018Tuesday·January 2, 2018

24 papers—16 primary·8 cross-listed·reconstructed*

01*
Multi-jet production in the high energy limit at LHC
G. Chachamis🇪🇸 · F. Caporale🇪🇸 · F. G. Celiberto🇪🇸 · D. Gordo Gomez🇪🇸 · A. Sabio Vera🇪🇸
We briefly review observables that were recently proposed in inclusive 3 jet production at hadronic colliders. They are based on azimuthal angle correlations between the final state jets and can be seen as a generalisation of the usual Mueller-Navelet setup. We discuss the stability of the observables once higher order corrections beyond the leading logarithmic accuracy are taken into account. Finally, we give a status report on a related project in which we examine azimuthal angle correlations for Mueller-Navelet jets after imposing a rapidity veto which forbids subsequent minijet emissions to be very close in rapidity.
hep-ph20 citations
02*
Numerical analysis of the unintegrated double gluon distribution
Edgar Elias🇺🇸 · Krzysztof Golec-Biernat🇵🇱 · Anna M. Stasto🇺🇸
We present detailed numerical analysis of the unintegrated double gluon distribution which includes the dependence on the transverse momenta of partons. The unintegrated double gluon distribution was obtained following the Kimber-Martin-Ryskin method as a convolution of the perturbative gluon splitting function with the collinear integrated double gluon distribution and the Sudakov form factors. We analyze the dependence on the transverse momenta, longitudinal momentum fractions and hard scales. We find that the unintegrated gluon distribution factorizes into a product of two single unintegrated gluon distributions in the region of small values of $x$ , provided the splitting contribution is included and the momentum sum rule is satisfied.
hep-phJHEP(2018)·14 citations
03*
The unbearable smallness of magnetostatic QCD corrections
Chris P. Korthals Altes🇳🇱
One loop corrections to the magnetostatic QCD action are evaluated to dimension six in the magnetostatic fields.The result is remarkably simple $\frac{1}{4} \int d x (F_{ij}^{a})^{2} - \frac{g _{M}^{2} N}{32 π m _{E}^{3}} \int d x (\frac{1}{60} (D_{m}^{ab} F_{m r}^{b})^{2} + \frac{1}{180} f^{ab c} F_{mn}^{a} F_{n r}^{b} F_{r m}^{c}) (1 + O (g_{M}^{2})) .$ In all of the deconfined phase the correction is quite small. The term of $O (g_{M}^{2})$ is the dimension eight contribution and is only presented in a covariant derivative basis. We discuss their physical relevance for the pressure and the spatial Wilson loop.
hep-ph5 citations
04*
Classical and quantum entropy of parton distributions
Yoshikazu Hagiwara🇯🇵 · Yoshitaka Hatta🇯🇵 · Bo-Wen Xiao🇨🇳 · Feng Yuan🇺🇸
We introduce the semiclassical Wehrl entropy for the nucleon as a measure of complexity of the multiparton configuration in phase space. This gives a new perspective on the nucleon tomography. We evaluate the entropy in the small- $x$ region and compare with the quantum von Neumann entropy. We also discuss the growth of entropy at small- $x$ and argue that it eventually saturates due to the Pomeron loop effect.
hep-phPRD(2018)·64 citations
05*
One-loop electroweak radiative corrections to polarized Bhabha scattering
D. Bardin (1)🇷🇺 · A. Arbuzov (2 and 3)🇷🇺 · S. Bondarenko (2)🇷🇺 · Ya. Dydyshka (1)🇷🇺 · L. Kalinovskaya (1)🇷🇺 · L. Rumyantsev (1,4)🇷🇺 · R. Sadykov (1) ((1) Dzhelepov Laboratory of Nuclear Problems, JINR, (2) Bogoliubov Laboratory of Theoretical Physics, (3) Dubna university, (4) Institute of Physics, Southern Federal University)
Theoretical predictions for Bhabha scattering observables are presented including complete one-loop electroweak radiative corrections. A longitudinal polarization of the initial beams is taken into account. Numerical results for the asymmetry $A_{L R}$ and the relative correction $δ$ are given for the set of the energy $E_{c m} = 250, 500, 1000$ ~GeV with various polarization degrees.
hep-phPRD(2018)·26 citations
06*
Hidden charmed states and multibody color flux-tube dynamics
Chengrong Deng🇨🇳 · Jialun Ping🇨🇳 · Hongxia Huang🇨🇳 · Fan Wang🇨🇳
Within the framework of the color flux-tube model with a multibody confinement potential, we systematically investigate the hidden charmed states observed in recent years. It can be found that most of them can be described as the compact tetraquark states $[c q] [c ˉ q ˉ]$ ( $q = u, d$ and $s$ ) in the color flux-tube model. The multibody confinement potential based on the color flux-tube picture is a dynamical mechanism in the formation and decay of the compact tetraquark states.
hep-phPRD(2018)·28 citations
07*
Comprehending Particle Production in Proton+Proton and Heavy-ion collisions at the Large Hadron Collider
Raghunath Sahoo🇮🇳
Particle production mechanisms in proton+proton and heavy-ion collisions at the LHC energies are discussed. An attempt is made to connect p+p to heavy-ion collisions in understanding the final state observables. New emerging phenomena like Multipartonic Interactions (MPI) and Color Reconnection (CR) mechanism are important in understanding heavy-ion like behaviors in high-multiplicity p+p events. Particle spectra, Multipartonic Interactions, Strangeness enhancement, Nuclear modification factor etc. are few of the aspects, which are discussed in this presentation.
hep-phhep-exnucl-exnucl-thDAE Symp.Nucl.Phys.(2017)·0 citations
08*
Goldstonic pseudoscalar mesons in Bethe-Salpeter-inspired setting
Wolfgang Lucha🇦🇹 · Franz F. Schoberl🇦🇹
For a two-particle bound-state equation closer to its Bethe-Salpeter origins than Salpeter's equation, with effective-interaction kernel deliberately forged such as to ensure, in the limit of zero mass of the bound-state constituents, the vanishing of the arising bound-state mass, we scrutinize the emerging features of the lightest pseudoscalar mesons for their agreement with the behaviour predicted by a generalization of the Gell-Mann-Oakes-Renner relation.
hep-phnucl-thInt.J.Mod.Phys.A(2018)·2 citations
09*
A new distribution for multiplicities in leptonic and hadronic collisions at high energies
R.Chawla🇮🇳 · M.Kaur🇮🇳
Charged particles production in the electron-positron, pbarp and pp collisions in full phase space as well as in the restricted phase space slices, at high energies are described with predictions from shifted Gompertz distribution, a model of adoption of innovations. The distribution has been extensively used in diffusion theory, social networks and forecasting. A two-component model in which PDF is obtained from the superposition of two shifted Gompertz distributions has been introduced to improve the fitting of the experimental distributions by several orders. The two-components correspond to the two subgroups of a data set, one representing the soft interactions and the other semi-hard interactions. Mixing is done by appropriately assigning weights to each subgroup. Our first attempt to analyse the data with shifted Gompertz distribution has produced extremely good results. It is suggested that the distribution may be included in the host of distributions more often used for the multiplicity analyses.
hep-phAdv.High Energy Phys.(2018)·9 citations
10*
Goldstone Modes and Clebsch-Gordan Coefficients
Xian-Zheng Bai🇨🇳 · Deshan Yang🇨🇳 · Da-Xin Zhang🇨🇳
We solve explicitly the Goldstone modes in spontaneously symmetry breaking models with supersymmetry. We find that, when more than one fields or representations contribute to the symmetry breaking, there exist identities among the Clebsch-Gordan coefficients which can be used as consistent checks on the calculations.
hep-phnucl-thNPB(2018)·0 citations
11*
Comments on the nucleon spin composition and diquark correlations
Edward Shuryak🇺🇸
We discuss possible relation between recent lattice results on the flavor composition of the nucleon spin and the topology-induced quark correlations.
hep-ph0 citations
12*
A Multicomponent Dark Matter in a Model with Mirror Symmetry with Additional Charged Scalars
Mirza Satriawan🇮🇩
A model with a mirror symmetry whose particles content consist of the ordinary SM particles (plus the right handed neutrinos) and their parity mirror partners, can provide a multicomponent dark matter consist of cold and warm dark matter components. I add to the original mirror model a singlet scalar and its mirror partner, whose quantum numbers are the same as the singlet right handed electron (and its mirror-partner). The new scalar can have a zero VEV, while its mirror partner VEV is non zero. As consequences mirror photon will obtain mass whose order is around the neutral mirror weak boson mass, rendering the mirror electromagnetic-like interaction similar like a mirror weak interaction. There is a mixing among the ordinary neutrinos, mirror neutrinos, the singlet and the doublet mirror electrons. As a result the mirror doublet electrons can have masses in the keV order, becoming the warm dark matter component of this model. The cold dark matter component comes from the mirror nucleons that can have mass larger than the ordinary nucleons. The Big Bang Nucleosynthesys constraint can be avoided by a large entropy production in the ordinary sector due to a slow decay of mirror singlet electrons. The temperature ratio of the two sectors is approximately proportional to the ratio of the VEV's of the ordinary and mirror Higgs, and this also will determine the cold-warm dark matter contribution to the cosmic energy density.
hep-ph1 citation
13*
Chiral phase transition at finite chemical potential in 2+1-flavor soft-wall AdS/QCD
Sean P. Bartz🇺🇸 · Theodore Jacobson🇺🇸
The phase transition from hadronic matter to chirally-symmetric quark-gluon plasma is expected to be a rapid crossover at zero quark chemical potential ( $μ$ ), becoming first order at some finite value of $μ$ , indicating the presence of a critical point. Using a three-flavor soft-wall model of AdS/QCD, we investigate the effect of varying the light and strange quark masses on the order of the chiral phase transition. At zero quark chemical potential, we reproduce the Columbia Plot, which summarizes the results of lattice QCD and other holographic models. We then extend this holographic model to examine the effects of finite quark chemical potential. We find that the the chemical potential does not affect the critical line that separates first-order from rapid crossover transitions. This excludes the possibility of a critical point in this model, suggesting that a different setup is necessary to reproduce all the features of the QCD phase diagram.
hep-phnucl-thPRC(2018)·23 citations
14*
Higgs Pair Production as a Signal of Enhanced Yukawa Couplings
Martin Bauer🇩🇪 · Marcela Carena🇺🇸 · Adrián Carmona🇩🇪
We present a non-trivial correlation between the enhancement of the Higgs-fermion couplings and the Higgs pair production cross section in two Higgs doublet models with a flavour symmetry. This symmetry suppresses flavour-changing neutral couplings of the Higgs boson and allows for a partial explanation of the hierarchy in the Yukawa sector. After taking into account the constraints from electroweak precision measurements, Higgs coupling strength measurements, and unitarity and perturbativity bounds, we identify an interesting region of parameter space leading to enhanced Yukawa couplings as well as enhanced di-Higgs gluon fusion production at the LHC reach. This effect is visible in both the resonant and non-resonant contributions to the Higgs pair production cross section. We encourage dedicated searches based on differential distributions as a novel way to indirectly probe enhanced Higgs couplings to light fermions.
hep-phPRL(2018)·24 citations
15*
Factorization of Standard Model cross sections at ultra high energy
Yang-Ting Chien🇺🇸 · Hsiang-nan Li🇹🇼
The factorization theorem for organizing multiple electroweak boson emissions at future colliders with energy far above the electroweak scale is formulated. Taking the inclusive muon-pair production in electron-positron collisions as an example, we argue that the summation over isospins is demanded for constructing the universal distributions of leptons and gauge bosons in an electron. These parton distributions are shown to have the same infrared structure in the phases of broken and unbroken electroweak symmetry, an observation consistent with the Goldstone Equivalence Theorem. The electroweak factorization of processes involving protons is sketched, with an emphasis on the subtlety of the scalar distributions.
hep-phPRD(2018)·6 citations
16*
Analysis of strong decays of charmed mesons $D_{2}^{*} (2460)$ , $D_{0} (2560)$ , $D_{2} (2740)$ , $D_{1} (3000)$ , $D_{2}^{*} (3000)$ and their spin partners $D_{1}^{*} (2680)$ , $D_{3}^{*} (2760)$ and $D_{0}^{*} (3000)$
Pallavi Gupta🇮🇳 · A. Upadhyay🇮🇳
Using the effective Lagrangian approach, we examine the recently observed charm states $D_{J}^{*} (2460)$ , $D_{J} (2560)$ , $D_{J} (2740)$ , $D_{J} (3000)$ and their spin partners $D_{J}^{*} (2680)$ , $D_{J}^{*} (2760)$ and $D_{J}^{*} (3000)$ with $J^{P}$ states $1 P_{\frac{3}{2}} 2^{+}$ , $2 S_{\frac{1}{2}} 0^{-}$ , $1 D_{\frac{5}{2}} 2^{-}$ , $2 P_{\frac{1}{2}} 1^{+}$ and $2 S_{\frac{1}{2}} 1^{-}$ , $1 D_{\frac{5}{2}} 3^{-}$ , $2 P_{\frac{1}{2}} 0^{+}$ respectively. We study their two body strong decays, coupling constants and branching ratios with the emission of light pseudo-scalar mesons $(π, η, K)$ . We also analyze the newly observed charm state $D_{2}^{*} (3000)$ and suggest it to be either $1 F (2^{+})$ or $2 P (2^{+})$ state and justify one of them to be the most favorable assignment for $D_{2}^{*} (3000)$ . We study the partial and the total decay width of unobserved states $D (1^{1} F_{3})$ , $D_{s} (1^{1} F_{3})$ and $D_{s} (1^{1} F_{2})$ as the spin and the strange partners of the $D_{2}^{*} (3000)$ charmed meson. The branching ratios and the coupling constants $g_{T H}$ , $g_{H H}$ , $g_{Y H}$ , $g_{S H}$ and $g_{Z H}$ calculated in this work can be confronted with the future experimental data.
hep-phPRD(2018)·28 citations
17*
Principal Killing strings in higher-dimensional Kerr-NUT-(A)dS spacetimes
Jens Boos🇨🇦 · Valeri P. Frolov🇨🇦
We construct special solutions of the Nambu-Goto equations for stationary strings in a general Kerr-NUT-(A)dS spacetime in any number of dimensions. This construction is based on the existence of explicit and hidden symmetries generated by the principal tensor which exists for these metrics. The characteristic property of these string configurations, which we call "principal Killing strings," is that they are stretched out from "infinity" to the horizon of the Kerr-NUT-(A)dS black hole and remain regular at the latter. We also demonstrate that principal Killing strings extract angular momentum from higher-dimensional rotating black holes and interpret this as the action of an asymptotic torque.
↳ gr-qchep-phPRD(2018)·4 citations
18*
Modified Dark Matter in Galaxies and Galaxy Clusters
Douglas Edmonds🇺🇸 · Duncan Farrah🇺🇸 · Djordje Minic🇺🇸 · Y. Jack Ng🇺🇸 · Tatsu Takeuchi🇺🇸
Modified Dark Matter (MDM) is a phenomenological model of dark matter, inspired by gravitational thermodynamics, that naturally accounts for the universal acceleration constant observed in galactic rotation curve data; a critical acceleration related to the cosmological constant, $Λ$ , appears as a phenomenological manifestation of MDM. We show that the resulting mass profiles, which are sensitve to $Λ$ , are consistent with observations at the galactic and galaxy cluster scales. Our results suggest that dark matter mass profiles contain information about the cosmological constant in a non-trivial way.
↳ astro-ph.COhep-phhep-thBulg.J.Phys.(2018)·8 citations
19*
Asymptotic safety of quantum gravity beyond Ricci scalars
Kevin G. Falls🇩🇪 · Callum R. King🇬🇧 · Daniel F. Litim🇬🇧 · Kostas Nikolakopoulos🇬🇧 · Christoph Rahmede🇬🇧
We investigate the asymptotic safety conjecture for quantum gravity including curvature invariants beyond Ricci scalars. Our strategy is put to work for families of gravitational actions which depend on functions of the Ricci scalar, the Ricci tensor, and products thereof. Combining functional renormalisation with high order polynomial approximations and full numerical integration we derive the renormalisation group flow for all couplings and analyse their fixed points, scaling exponents, and the fixed point effective action as a function of the background Ricci curvature. The theory is characterised by three relevant couplings. Higher-dimensional couplings show near-Gaussian scaling with increasing canonical mass dimension. We find that Ricci tensor invariants stabilise the UV fixed point and lead to a rapid convergence of polynomial approximations. We apply our results to models for cosmology and establish that the gravitational fixed point admits inflationary solutions. We also compare findings with those from $f (R)$ -type theories in the same approximation and pin-point the key new effects due to Ricci tensor interactions. Implications for the asymptotic safety conjecture of gravity are indicated.
↳ hep-thgr-qchep-phPRD(2018)·170 citations
20*
Using the tilted flat- $Λ$ CDM and the untilted non-flat $Λ$ CDM inflation models to measure cosmological parameters from a compilation of observational data
Chan-Gyung Park🇰🇷 · Bharat Ratra🇺🇸
We use the physically-consistent tilted spatially-flat and untilted non-flat $Λ$ CDM inflation models to constrain cosmological parameter values with the Planck 2015 cosmic microwave background (CMB) anisotropy data and recent Type Ia supernovae measurements, baryonic acoustic oscillations (BAO) data, growth rate observations, and Hubble parameter measurements. The most dramatic consequence of including the four non-CMB data sets is the significant strengthening of the evidence for non-flatness in the non-flat $Λ$ CDM model, from 1.8 $σ$ for the CMB data alone to 5.1 $σ$ for the full data combination. The BAO data is the most powerful of the non-CMB data sets in more tightly constraining model parameter values and in favoring a spatially-closed Universe in which spatial curvature contributes about a percent to the current cosmological energy budget. The untilted non-flat $Λ$ CDM model better fits the large-angle CMB temperature anisotropy angular spectrum and is more consistent with the Dark Energy Survey constraints on the current value of the rms amplitude of mass fluctuations ( $σ_{8}$ ) as a function of the current value of the nonrelativistic matter density parameter ( $Ω_{m}$ ) but does not provide as good a fit to the smaller-angle CMB temperature anisotropy data as does the tilted flat- $Λ$ CDM model. Some measured cosmological parameter values differ significantly between the two models, including the reionization optical depth and the baryonic matter density parameter, both of whose 2 $σ$ ranges (in the two models) are disjoint or almost so.
↳ astro-ph.COgr-qchep-phhep-thApJ(2019)·136 citations
21*
Clifford Structures in Noncommutative Geometry and the Extended Scalar Sector
Maxim A. Kurkov🇧🇷 · Fedele Lizzi🇮🇹
We consider aspects of the noncommutative approach to the standard model based on the spectral action principle. We show that as a consequence of the incorporation of the Clifford structures in the formalism, the spectral action contains an extended scalar sector, with respect to the minimal Standard Model. This may have interesting phenomenological consequences. Some of these new scalar fields carry both weak isospin and colour indexes. We calculate the new terms in spectral action due to the presence of these fields. Our analysis demonstrates that the fermionic doubling in the noncommutative geometry is not just a presence of spurious degrees of freedom, but it is an interesting and peculiar property of the formalism, which leads to physically valuable conclusions. Some of the new fields do not contribute to the physical fermionic action, but they appear in the bosonic spectral action. Their contributions to the Dirac operator correspond to couplings with the spurious fermions, which are projected out.
↳ hep-thhep-phmath-phmath.MPPRD(2018)·9 citations
22*
Hydrodynamic Collectivity in Proton--Proton Collisions at 13 TeV
Wenbin Zhao🇨🇳 · You Zhou🇩🇰 · Hao-jie Xu🇨🇳 · Weitian Deng🇨🇳 · Huichao Song🇨🇳
In this paper, we investigate the hydrodynamic collectivity in proton--proton (pp) collisions at 13 TeV, using iEBE-VISHNU hybrid model with HIJING initial conditions. With properly tuned parameters, our model simulations can remarkably describe all the measured 2-particle correlations, including integrated and differential elliptic flow coefficients for all charged and identified hadrons ( $K_{S}^{0}$ , $Λ$ ). However, our model calculations show positive 4-particle cumulant $c_{2} {4}$ in high multiplicity pp collisions, and can not reproduce the negative $c_{2} {4}$ measured in experiment. Further investigations on the HIJING initial conditions show that the fluctuations of the second order anisotropy coefficient $ε_{2}$ increases with the increase of its mean value, which leads to a similar trend of the flow fluctuations. For a simultaneous description of the 2- and 4- particle cumulants within the hydrodynamic framework, it is required to have significant improvements on initial condition for pp collisions, which is still lacking of knowledge at the moment.
↳ nucl-thhep-phnucl-exPLB(2018)·98 citations
23*
Gravitational Waves in Cold Dark Matter
Raphael Flauger🇺🇸 · Steven Weinberg🇺🇸
We study the effects of cold dark matter on the propagation of gravitational waves of astrophysical and primordial origin. We show that the dominant effect of cold dark matter on gravitational waves from astrophysical sources is a small frequency dependent modification of the propagation speed of gravitational waves. However, the magnitude of the effect is too small to be detected in the near future. We furthermore show that the spectrum of primordial gravitational waves in principle contains detailed information about the properties of dark matter. However, depending on the wavelength, the effects are either suppressed because the dark matter is highly non-relativistic or because it contributes a small fraction of the energy density of the universe. As a consequence, the effects of cold dark matter on primordial gravitational waves in practice also appear too small to be detectable.
↳ astro-ph.COgr-qchep-phhep-thPRD(2018)·68 citations
24*
Remarks on the Confinement in the $G (2)$ Gauge Theory Using the Thick Center Vortex Model
Hadi Lookzadeh🇮🇷
The confinement problem is studied using the thick center vortex model. It is shown that the $S U (3)$ Cartan sub algebra of the decomposed $G (2)$ gauge theory can play an important role in the confinement. The Casimir eigenvalues and ratios of the $G (2)$ representations are obtained using its decomposition to the $S U (3)$ subgroups. This leads to the conjecture that the $S U (3)$ subgroups also can explain the $G (2)$ properties of the confinement. The thick center vortex model for the $S U (3)$ subgroups of the $G (2)$ gauge theory is applied without the domain modification. Instead, the presence of two $S U (3)$ vortices with opposite fluxes due to the possibility of decomposition of the $G (2)$ Cartan sub algebra to the $S U (3)$ groups can explain the properties of the confinement of the $G (2)$ group both at intermediate and asymptotic distances which is studied here.
↳ hep-thhep-lathep-phInt.J.Mod.Phys.A(2021)·0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.