scholarly journals Searching for Minimum in Dependence of Squared Speed-of-Sound on Collision Energy

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Fu-Hu Liu ◽  
Li-Na Gao ◽  
Roy A. Lacey
Keyword(s):  
Speed Of Sound ◽  
Center Of Mass ◽  
Incident Beam ◽  
Gluon Plasma ◽  
Beam Momentum ◽  
Proton Synchrotron ◽  
Super Proton Synchrotron ◽  
Center Of Mass Energy ◽  
Knee Point ◽  
Charged Pions

Experimental results of the rapidity distributions of negatively charged pions produced in proton-proton (p-p) and beryllium-beryllium (Be-Be) collisions at different beam momentums, measured by the NA61/SHINE Collaboration at the super proton synchrotron (SPS), are described by a revised (three-source) Landau hydrodynamic model. The squared speed-of-sound parametercs2is then extracted from the width of rapidity distribution. There is a local minimum (knee point) which indicates a softest point in the equation of state (EoS) appearing at about40A GeV/c(or 8.8 GeV) incs2excitation function (the dependence ofcs2on incident beam momentum (or center-of-mass energy)). This knee point should be related to the searching for the onset of quark deconfinement and the critical point of quark-gluon plasma (QGP) phase transition.

scholarly journals The Production of Neutral N∗(11052) Resonance with Hidden Beauty from π-p Scattering

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Chen Cheng ◽  
Xiao-Yun Wang
Keyword(s):  
Cross Sections ◽  
Center Of Mass ◽  
Proton Synchrotron ◽  
Super Proton Synchrotron ◽  
Total Cross Sections ◽  
Center Of Mass Energy ◽  
Compass Experiment ◽  
Effective Lagrangian ◽  
Discovery Potential ◽  
Clear Peak

We investigate the discovery potential of the predicted neutral hidden beauty N∗(11052) resonance through π-p scattering within an effective Lagrangian approach. Two reactions π-p→K-Σ+ and π-p→ηbn are studied in this work, with nucleon pole exchange as the background. It is found that the contributions of the N∗(11052) resonance give clear peak structures in the magnitude of 1 μb near the threshold of N∗(11052) in the total cross sections. The numerical results indicate that the center of mass energy W≃11–11.1 GeV would be the best energy window for searching the N∗(11052) resonance, where the N∗(11052) signal can be easily distinguished from the background. The COMPASS experiment at CERN’s Super Proton Synchrotron (SPS) with pion beam of ≃280 GeV will be an ideal platform for searching the super-heavy resonance with hidden beauty, which is promising for testing the theoretical results.

INTERMITTENCY PATTERNS IN PROTON-NUCLEUS INTERACTIONS AT HIGH ENERGY

1993 ◽  
Vol 08 (40) ◽  
pp. 3853-3859 ◽  
Author(s):  
D. K. MAITY ◽  
P. K. BANERJEE ◽  
B. B. DAS ◽  
D. RAVINDRAN ◽  
D. K. BHATTACHARJEE
Keyword(s):  
Power Law ◽  
Quark Gluon Plasma ◽  
Center Of Mass ◽  
Gluon Plasma ◽  
High Energy ◽  
Mass Energy ◽  
Factorial Moments ◽  
Center Of Mass Energy

A study of intermittency in hadron-nucleus and the comparison with nucleus-nucleus interactions is presented. The power law behavior of the factorial moments and the variation of intermittency index with the center-of-mass energy are shown. Results favor the formation of quark-gluon plasma in preference to a cascade mechanism.

scholarly journals A Review onϕMeson Production in Heavy-Ion Collision

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Md. Nasim ◽  
Vipul Bairathi ◽  
Mukesh Kumar Sharma ◽  
Bedangadas Mohanty ◽  
Anju Bhasin
Keyword(s):  
Hadron Collider ◽  
Center Of Mass ◽  
Meson Production ◽  
Dense Matter ◽  
Heavy Ion ◽  
Experimental Program ◽  
Proton Synchrotron ◽  
Relativistic Heavy Ion Collider ◽  
Super Proton Synchrotron ◽  
Strangeness Enhancement

The main aim of the relativistic heavy-ion experiment is to create extremely hot and dense matter and study the QCD phase structure. With this motivation, experimental program started in the early 1990s at the Brookhaven Alternating Gradient Synchrotron (AGS) and the CERN Super Proton Synchrotron (SPS) followed by Relativistic Heavy Ion Collider (RHIC) at Brookhaven and recently at Large Hadron Collider (LHC) at CERN. These experiments allowed us to study the QCD matter from center-of-mass energies (sNN) 4.75 GeV to 2.76 TeV. Theϕmeson, due to its unique properties, is considered as a good probe to study the QCD matter created in relativistic collisions. In this paper we present a review on the measurements ofϕmeson production in heavy-ion experiments. Mainly, we discuss the energy dependence ofϕmeson invariant yield and the production mechanism, strangeness enhancement, parton energy loss, and partonic collectivity in nucleus-nucleus collisions. Effect of later stage hadronic rescattering on elliptic flow (v2) of proton is also discussed relative to corresponding effect onϕmesonv2.

Pion PT distribution in hadron–nucleus interaction at accelerator energy

1980 ◽  
Vol 58 (7) ◽  
pp. 969-971 ◽  
Author(s):  
Dipak C. Ghosh
Keyword(s):  
Heavy Nucleus ◽  
Incident Beam ◽  
Beam Momentum ◽  
Nucleus Collision ◽  
Nucleus Interaction ◽  
Charged Pions

In the present work we have investigated the nature of the low PT distribution of secondary charged pions produced in p–nucleus collision in emulsion at the incident beam momentum 22.6 GeV/c. The general characteristics of the PT2 distribution have been found to be the same as in the case of hadron–hadron collisions. A comparison of the PT2 distribution for the two sets of reactions p – heavy nucleus (Nh > 6) and p – light (Nh ≤ 6) is also made.

scholarly journals PHOTON PRODUCTION IN RELATIVISTIC NUCLEAR COLLISIONS AT SPS AND RHIC ENERGIES

2004 ◽  
Vol 19 (31) ◽  
pp. 5351-5358 ◽  
Author(s):  
SIMON TURBIDE ◽  
RALF RAPP ◽  
CHARLES GALE
Keyword(s):  
Form Factors ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Nucleon Nucleon ◽  
Proton Synchrotron ◽  
Relativistic Heavy Ion Collider ◽  
Super Proton Synchrotron ◽  
Strange Meson ◽  
Nuclear Collisions ◽  
Relativistic Nuclear Collisions

Chiral Lagrangians are used to compute the production rate of photons from the hadronic phase of relativistic nuclear collisions. Special attention to the role of the a1 pseudovector is paid. Calculations that include strange meson reactions, form factors, the use of consistent vector spectral densities, the emission from a quark-gluon plasma, and primordial nucleon-nucleon collisions reproduce the photon spectra measured at the Super Proton Synchrotron (SPS). Some predictions for the Relativistic Heavy Ion Collider (RHIC) are made.

scholarly journals Anisotropic flow of identified particles in Pb–Pb collisions at √SNN = 5.02 TeV

2018 ◽  
Vol 171 ◽  
pp. 17002
Author(s):  
Redmer Alexander Bertens
Keyword(s):  
Initial Conditions ◽  
Center Of Mass ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Mass Energy ◽  
Initial State ◽  
Anisotropic Flow ◽  
Center Of Mass Energy ◽  
Ion Collisions ◽  
Hydrodynamic Calculations

Anisotropic flow is sensitive to the shear (η/s) and bulk (ζ/s) viscosity of the quark-gluon plasma created in heavy-ion collisions, as well as the initial state of such collisions and hadronization mechanisms. In these proceedings, elliptic (υ2) and higher harmonic (υ3, υ4) flow coefficients of π±, K±, p(p) and the ϕ-meson, are presented for Pb—Pb collisions at the highest-ever center-of-mass energy of [see formula in PDF] = 5.02 TeV. Comparisons to hydrodynamic calculations (IP-Glasma, MUSIC, UrQMD) are shown to constrain the initial conditions and viscosity of the medium.

scholarly journals FRAGMENTATION FUNCTIONS AT BABAR

2014 ◽  
Vol 25 ◽  
pp. 1460044
Author(s):  
◽  
ISABELLA GARZIA
Keyword(s):  
Charged Pion ◽  
Production Cross ◽  
Center Of Mass ◽  
Center Of Mass Energy ◽  
Charged Pions ◽  
Fragmentation Functions ◽  
Fragmentation Processes ◽  
Azimuthal Modulation ◽  
Shed Light

Inclusive hadron production cross section in e+e- annihilation shed light on fundamental questions of hadronization and fragmentation processes. We present measurements of inclusive spectra of charged pions, kaons, and protons (antiprotons) produced in e+e- collisions at the center-of-mass energy of 10.54 GeV, and tests of QCD predictions and hadronization models. We also report the results on the measurement of the azimuthal modulation induced by the Collins effect in inclusive production of charged pion pairs e+e- → ππX, where the two pions are produced in opposite hemispheres. These data allows the determination of the polarized Collins fragmentation functions.

scholarly journals Measurements of multiplicity fluctuations of identified hadrons in inelastic proton–proton interactions at the CERN Super Proton Synchrotron

2021 ◽  
Vol 81 (5) ◽  
Author(s):  
A. Acharya ◽  
H. Adhikary ◽  
A. Aduszkiewicz ◽  
K. K. Allison ◽  
E. V. Andronov ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Data Analysis ◽  
Collision Energy ◽  
Beam Momentum ◽  
Particle Identification ◽  
Proton Synchrotron ◽  
Super Proton Synchrotron ◽  
Proton Proton ◽  
Intensive Quantities ◽  
Multiplicity Distributions

AbstractMeasurements of multiplicity fluctuations of identified hadrons produced in inelastic p+p interactions at 31, 40, 80, and 158 $$\text {Ge}\text {V}/c$$ Ge / c beam momentum are presented. Three different measures of multiplicity fluctuations are used: the scaled variance $$\omega $$ ω and strongly intensive measures $$\Sigma $$ Σ and $$\Delta $$ Δ . These fluctuation measures involve second and first moments of joint multiplicity distributions. Data analysis is preformed using the Identity method which corrects for incomplete particle identification. Strongly intensive quantities are calculated in order to allow for a direct comparison to corresponding results on nucleus–nucleus collisions. The results for different hadron types are shown as a function of collision energy. A comparison with predictions of string-resonance Monte-Carlo models: Epos, Smash and Venus, is also presented.

Fragmentation analysis of 105Ag∗ nucleus governed via complete and incomplete fusion channels at Ec.m. = 89MeV

2020 ◽  
Vol 35 (12) ◽  
pp. 2050084
Author(s):  
Ishita Sharma ◽  
Manoj K. Sharma
Keyword(s):  
Cross Sections ◽  
Center Of Mass ◽  
Incident Beam ◽  
Heavy Ion ◽  
Incomplete Fusion ◽  
Cluster Decay ◽  
Complete Fusion ◽  
Center Of Mass Energy ◽  
Complete And Incomplete Fusion ◽  
Incident Beam Energy

A systematic study of dynamical aspects associated with heavy-ion-induced [Formula: see text] reaction is carried out at center-of-mass energy [Formula: see text] MeV. The complete fusion (CF) and incomplete fusion (ICF) contributions are estimated by using the dynamical cluster-decay model (DCM). The incomplete fusion component is examined by normalizing the incident beam energy for each of the breakup fragment. The fusion evaporation cross-sections that emerged from CF and ICF channels are duly addressed using the optimized value of neck-length parameter [Formula: see text]. Further, the mass yield of compound nuclei (CN) formed in the CF and ICF processes is analyzed with respect to angular momentum [Formula: see text] values. The DCM-based calculations indicate the possible contribution of deep inelastic collision (DIC) in the decay of [Formula: see text] at higher [Formula: see text] values, and DIC cross-sections are predicted which call for future validation.

scholarly journals EXCITED HADRONS AS A SIGNAL FOR QUARK–GLUON PLASMA FORMATION

2006 ◽  
Vol 21 (16) ◽  
pp. 3421-3440 ◽  
Author(s):  
BISWANATH LAYEK ◽  
AJIT M. SRIVASTAVA ◽  
SOMA SANYAL
Keyword(s):  
Transition Temperature ◽  
Excited States ◽  
Quark Gluon Plasma ◽  
Center Of Mass ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Large Error ◽  
Relativistic Heavy Ion Collisions ◽  
Excitation Energies ◽  
Center Of Mass Energy

At the quark–hadron transition, when quarks get confined to hadrons, certain orbitally excited states, namely those which have excitation energies above the respective L = 0 states of the same order as the transition temperature Tc, may form easily because of thermal velocities of quarks at the transition temperature. We propose that the ratio of multiplicities of such excited states to the respective L = 0 states can serve as an almost model independent signal for the quark–gluon plasma (QGP) formation in relativistic heavy-ion collisions. For example, the ratio R* of multiplicities of [Formula: see text] and [Formula: see text] when plotted with respect to the center-of-mass energy of the collision [Formula: see text] (or vs. centrality/number of participants), should show a jump at the value of [Formula: see text] beyond which the QGP formation occurs. This should happen irrespective of the shape of the overall plot of R* vs. [Formula: see text]. Recent data from RHIC on Λ*/Λ vs. N part for large values of N part may be indicative of such a behavior, though there are large error bars. We give a list of several other such candidate hadronic states.

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