scholarly journals Induced surface and curvature tension equation of state for hadron resonance gas in finite volumes and its relation to morphological thermodynamics

2021 ◽  
Author(s):  
K. A. Bugaev ◽  
O. V. Vitiuk ◽  
B. E. Grinyuk ◽  
P. P. Panasiuk ◽  
N. S. Yakovenko ◽  
...  
Keyword(s):  
Equation Of State ◽  
High Pressures ◽  
Center Of Mass ◽  
Hard Core ◽  
Light Nuclei ◽  
Canonical Partition Function ◽  
Finite Systems ◽  
Center Of Mass Energy ◽  
Realistic Interaction ◽  
Energy Formula

Here, we develop an original approach to investigate the grand canonical partition function of the multicomponent mixtures of Boltzmann particles with hard-core interaction in finite and even small systems of the volumes above 20 fm3. The derived expressions of the induced surface tension equation of state (EoS) are analyzed in detail. It is shown that the metastable states, which can emerge in the finite systems with realistic interaction, appear at very high pressures at which the hadron resonance gas, most probably, is not applicable at all. It is shown how and under what conditions the obtained results for finite systems can be generalized to include into a formalism the equation for curvature tension. The applicability range of the obtained equations of induced surface and curvature tensions for finite systems is discussed and their close relations to the equations of the morphological thermodynamics are established. The hadron resonance gas model on the basis of the obtained advanced EoS is worked out. Also, this model is applied to analyze the chemical freeze-out of hadrons and light nuclei with the number of (anti-) baryons not exceeding 4. Their multiplicities were measured by the ALICE Collaboration in the central lead–lead collisions at the center-of-mass energy [Formula: see text] TeV.

scholarly journals Particle production at RHIC and LHC energies

2015 ◽  
Vol 30 (22) ◽  
pp. 1550131 ◽  
Author(s):  
A. Tawfik ◽  
E. Gamal ◽  
A. G. Shalaby
Keyword(s):  
Particle Production ◽  
Hadron Collider ◽  
Center Of Mass ◽  
System Size ◽  
Alice Experiment ◽  
Center Of Mass Energy ◽  
Particle Ratios ◽  
Strangeness Enhancement ◽  
Homogeneous Particle ◽  
Energy Formula

The production of pion, kaon and proton was measured in Pb–Pb collisions at nucleus–nucleus center-of-mass energy [Formula: see text] by the ALICE experiment at Large Hadron Collider (LHC). The particle ratios of these species compared to the RHIC measurements are confronted to the hadron resonance gas (HRG) model and to simulations based on the event generators PYTHIA 6.4.21 and HIJING 1.36. It is found that the homogeneous particle–antiparticle ratios (same species) are fully reproducible by means of HRG and partly by PYTHIA 6.4.21 and HIJING 1.36. The mixed kaon–pion and proton–pion ratios measured at RHIC and LHC energies seem to be reproducible by the HRG model. On the other hand, the strange abundances are underestimated in both event generators. This might be originated to strangeness suppression in the event generators and/or possible strangeness enhancement in the experimental data. It is apparent that the values of kaon–pion ratios are not sensitive to the huge increase of [Formula: see text] from 200 (RHIC) to 2760 GeV (LHC). We conclude that the ratios of produced particle at LHC seem not depending on the system size.

scholarly journals Diboson production at LHC and Tevatron

2014 ◽  
Vol 31 ◽  
pp. 1460279 ◽  
Author(s):  
Jian Wang ◽  
Keyword(s):  
Standard Model ◽  
Center Of Mass ◽  
Mass Energy ◽  
Diboson Production ◽  
Center Of Mass Energy ◽  
Triple Gauge Couplings ◽  
Model Predictions ◽  
Energy Formula ◽  
Anomalous Triple Gauge Couplings ◽  
8 Tev

This is a report at the conference Physics In Collision 2013. The experimental results on physics of diboson production are reviewed. The measurements use pp collision at the LHC with center-of-mass energy [Formula: see text] and 8 TeV, and [Formula: see text] collision at the Tevatron with [Formula: see text]. These include measurements of Wγ, Zγ, WW, WZ and ZZ production. The results are compared with Standard Model predictions, and are interpreted in terms of constraints on charged and neutral anomalous triple gauge couplings.

Single production of vector-like top partner in the Wb channel at eγ collision in the LHT model

2019 ◽  
Vol 34 (18) ◽  
pp. 1950093
Author(s):  
Guang Yang ◽  
Bingfang Yang ◽  
Biaofeng Hou ◽  
Hengheng Bi
Keyword(s):  
Search Strategy ◽  
Center Of Mass ◽  
High Energy ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Energy Formula ◽  
Single Production ◽  
Detector Simulation ◽  
Higgs Data ◽  
Integrated Luminosity

In the framework of the littlest Higgs Model with T-parity (LHT), we investigate the single production of vector-like top partner [Formula: see text] decaying to [Formula: see text] in the leptonic channel at the high energy [Formula: see text] collision. We utilize the polarized electron beam and photon beam to enhance the signal and propose a search strategy by performing a detector simulation. On the basis of the current limits from the precision electroweak data and Higgs data, we find that the top partner mass can be excluded up to 1350 (1380) GeV with integrated luminosity of 1000 fb[Formula: see text] and 1400 (1470) GeV with integrated luminosity of 3000 fb[Formula: see text] for the [Formula: see text] TeV (2.4 TeV) at the [Formula: see text] level. If the center-of-mass energy can be improved to 3.0 TeV, the limits on the top partner mass will reach 1450 (1550) GeV with integrated luminosities of 1000 (3000) fb[Formula: see text].

PSEUDORAPIDITY DISTRIBUTION OF CHARGED PARTICLES IN $p\bar p$ AND AA COLLISIONS AT HIGH ENERGIES

2005 ◽  
Vol 14 (04) ◽  
pp. 579-586
Author(s):  
FU SONG ◽  
FU-HU LIU
Keyword(s):  
Center Of Mass ◽  
Charged Particles ◽  
Pseudorapidity Distribution ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
High Energies ◽  
Cylinder Model ◽  
Energy Formula ◽  
Good Agreement ◽  
Aa Collisions

The pseudorapidity distributions of charged particles produced in [Formula: see text] annihilations and AA collisions at high energies are investigated by using a revised thermalized cylinder model. The Monte Carlo calculated results are compared and found to be in good agreement with the experimental data of [Formula: see text] annihilations at center-of-mass energy [Formula: see text], 546, 200, and 53 GeV, Au–Au collisions at [Formula: see text] and 130 A GeV, and Pb–Pb collisions at [Formula: see text].

scholarly journals Probing the Higgs with angular observables at future e+e− colliders

2016 ◽  
Vol 31 (33) ◽  
pp. 1644005 ◽  
Author(s):  
Zhen Liu
Keyword(s):  
Center Of Mass ◽  
Blind Spot ◽  
New Physics ◽  
Effective Field ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Physics Potential ◽  
Energy Formula ◽  
Scalar Top ◽  
The Impact

I summarize our recent works on using differential observables to explore the physics potential of future [Formula: see text] colliders in the framework of Higgs effective field theory. This proceeding is based upon Refs. 1 and 2. We study angular observables in the [Formula: see text] channel at future circular [Formula: see text] colliders such as CEPC and FCC-ee. Taking into account the impact of realistic cut acceptance and detector effects, we forecast the precision of six angular asymmetries at CEPC (FCC-ee) with center-of-mass energy [Formula: see text] GeV and 5 (30) ab[Formula: see text] integrated luminosity. We then determine the projected sensitivity to a range of operators relevant for the Higgsstrahlung process in the dimension-6 Higgs EFT. Our results show that angular observables provide complementary sensitivity to rate measurements when constraining various tensor structures arising from new physics. We further find that angular asymmetries provide a novel means of constraining the “blind spot” in indirect limits on supersymmetric scalar top partners. We also discuss the possibility of using [Formula: see text]-fusion at [Formula: see text] machines at different energies to probe new operators.

J/ψ PRODUCTION IN A GLAUBER MONTE CARLO FRAMEWORK

2010 ◽  
Vol 25 (05) ◽  
pp. 1009-1018 ◽  
Author(s):  
HONG-MIN WANG ◽  
ZHAO-YU HOU ◽  
BEN-AI ZHANG ◽  
XIAN-JING SUN
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Center Of Mass ◽  
Nuclear Modification Factor ◽  
Center Of Mass Energy ◽  
Modification Factor ◽  
Energy Formula ◽  
Theoretical Results ◽  
Monte Carlo Framework ◽  
Good Agreement

By means of a Glauber Monte Carlo framework, the J/ψ production at RHIC energies is studied with the EKS98, EPS09 and HKN07 shadowing parameters. With a χ2 analysis of the experimental data given by PHENIX, a significant dependence of the absorption cross-section, σ abs , on the J/ψ-nucleon center-of-mass energy, [Formula: see text], is revealed with the HKN07 shadowing, but an unconspicuous dependence is shown with the EKS98 and EPS09 shadowing. In this paper, the nuclear modification factor Rd Au vs y, pT and N coll are also calculated and the theoretical results are in good agreement with the experimental data.

scholarly journals Diboson production at LHC and Tevatron

2014 ◽  
Vol 29 (24) ◽  
pp. 1430056 ◽  
Author(s):  
Jian Wang ◽  
Keyword(s):  
Standard Model ◽  
Center Of Mass ◽  
Mass Energy ◽  
Diboson Production ◽  
Center Of Mass Energy ◽  
Triple Gauge Couplings ◽  
Model Predictions ◽  
Energy Formula ◽  
Anomalous Triple Gauge Couplings ◽  
8 Tev

The experimental results on physics of diboson production are reviewed. The measurements use pp collision at the LHC with center-of-mass energy [Formula: see text] and 8 TeV, and [Formula: see text] collision at the Tevatron with [Formula: see text]. These include measurements of Wγ, Zγ, WW, WZ and ZZ production. The results are compared with Standard Model predictions, and are interpreted in terms of constraints on charged and neutral anomalous triple gauge couplings.

A-DEPENDENCE OF Z-SCALING

2001 ◽  
Vol 16 (07) ◽  
pp. 1281-1301 ◽  
Author(s):  
M. V. TOKAREV ◽  
Yu. A. PANEBRATSEV ◽  
I. ZBOROVSKÝ ◽  
G. P. ŠKORO
Keyword(s):  
Cross Sections ◽  
Particle Production ◽  
Center Of Mass ◽  
Nucleon Nucleon ◽  
Hadron Production ◽  
Scale Transformation ◽  
Invariant Cross Section ◽  
Center Of Mass Energy ◽  
Energy Formula ◽  
Nucleon Nucleon Interaction

The A-dependence of z-scaling in inclusive hadron production in pA collisions at high transverse momenta is studied. The concept of z-scaling based on the fundamental principles of Nature such as self-similarity, locality, scale relativity and fractality reflecting the general features of particle interactions is applied for the description of processes of hadron production in pA collisions. The scaling function ψ is expressed via the invariant cross-section Ed3σ/dq3 and the average multiplicity density dN/dη of particles produced at pseudorapidity η=0 in the corresponding nucleon–nucleon interaction. The independence of the function ψ(z) on the center-of-mass energy [Formula: see text] for particle production near 90° in the NN c.m. system for different nuclei from D up to Pb is shown. The scale transformation z→az, ψ→a-1ψ is used to determine the A-dependence of the transformation parameter a. Based on the properties of z-scaling the dependence of the cross-sections for the π±, K±, and [Formula: see text] hadrons produced in pA collisions on transverse momentum q⊥ in the central region (η=0) at RHIC energies is predicted.

scholarly journals Lepton flavor violating decay of 125 GeV Higgs boson to μτ channel and excess in tt̄H

2016 ◽  
Vol 31 (30) ◽  
pp. 1650174 ◽  
Author(s):  
Biplob Bhattacherjee ◽  
Sabyasachi Chakraborty ◽  
Swagata Mukherjee
Keyword(s):  
Higgs Boson ◽  
Top Quark ◽  
Center Of Mass ◽  
New Physics ◽  
Final State ◽  
Center Of Mass Energy ◽  
Lepton Flavor ◽  
Higgs Decay ◽  
Energy Formula ◽  
8 Tev

A recent search for the lepton flavor violating (LFV) decays of the Higgs boson, performed by CMS collaboration, reports an interesting deviation from the Standard Model (SM). The search conducted in the channel [Formula: see text] and [Formula: see text] shows an excess of 2.4[Formula: see text] signal events with 19.6 fb[Formula: see text] data at a center-of-mass energy [Formula: see text] = 8 TeV. On the other hand, a search performed by CMS collaboration for the SM Higgs boson produced in association with a top quark pair [Formula: see text] also showed an excess in the same-sign dimuon final state. In this work, we try to find out if these two seemingly uncorrelated excesses are related or not. Our analysis reveals that a LFV Higgs decay [Formula: see text] can partially explain the excess in the same-sign dimuon final state in the [Formula: see text] search, infact brings down the excess well within 2[Formula: see text] error of the SM expectation. Probing such non-standard Higgs boson decay is of interest and might contain hints of new physics at the electroweak scale.

scholarly journals HADRON SPECTRA IN p+p COLLISIONS AT RHIC AND LHC ENERGIES

2013 ◽  
Vol 28 (16) ◽  
pp. 1350066 ◽  
Author(s):  
P. K. KHANDAI ◽  
P. SETT ◽  
P. SHUKLA ◽  
V. SINGH
Keyword(s):  
Hadron Collider ◽  
Center Of Mass ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collider ◽  
Systematic Analysis ◽  
Center Of Mass Energy ◽  
Hadron Spectra ◽  
200 Gev ◽  
Energy Formula ◽  
Two Parameters

We present the systematic analysis of transverse momentum (pT) spectra of identified hadrons in p+p collisions at Relativistic Heavy Ion Collider ([Formula: see text] and 200 GeV) and at Large Hadron Collider (LHC) energies ([Formula: see text], 2.76 and 7.0 TeV) using phenomenological fit functions. We review various forms of Hagedorn and Tsallis distributions and show their equivalence. We use Tsallis distribution which successfully describes the spectra in p+p collisions using two parameters, Tsallis temperature T which governs the soft bulk spectra and power n which determines the initial production in partonic collisions. We obtain these parameters for pions, kaons and protons as a function of center-of-mass energy [Formula: see text]. It is found that the parameter T has a weak but decreasing trend with increasing [Formula: see text]. The parameter n decreases with increasing [Formula: see text] which shows that production of hadrons at higher energies are increasingly dominated by point like qq scatterings. Another important observation is with increasing [Formula: see text], the separation between the powers for protons and pions narrows down hinting that the baryons and mesons are governed by same production process as one moves to the highest LHC energy.

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