scholarly journals THE pT-SPECTRA OF SOME NON-PION SECONDARIES IN HIGH ENERGY NN TO NA/AA COLLISIONS AND THE COMBINATIONAL APPROACH

2004 ◽  
Vol 19 (19) ◽  
pp. 3225-3243 ◽  
Author(s):  
BHASKAR DE ◽  
S. BHATTACHARYYA
Keyword(s):  
Cross Sections ◽  
Wide Band ◽  
Phenomenological Approach ◽  
High Energy ◽  
Measured Data ◽  
Major Category ◽  
Successful Completion ◽  
High Energies ◽  
Momentum Spectra ◽  
Transverse Momentum Spectra

In continuation of our perusal of the studies on transverse momentum spectra for the main varieties of secondaries from a consistent and comprehensive phenomenological approach, we propose to take up here — after a successful completion of reporting in detail the results (Ref. 4 in the text) on our analyses of the pT-spectra of pions — the studies specially on production of kaons, protons and antiprotons in several proton-induced and nucleus-involved collisions at high energies. The measured data on inclusive cross-sections of kaons, protons and antiprotons from the various published sources have here been assorted first. Next, data on the pT-spectra of the specific secondaries produced in PP and [Formula: see text] reactions have been scanned and analyzed with the help of Hagedorn's model (HM). Thereafter a connector, named here the combinational approach (CA), has been constructed and used to analyze the data on pT-spectra of some major category of non-pion secondaries produced in nucleus–nucleus (AA/AB) collisions at high energies. And these exercises have, finally, led to the modestly successful interpretations of a wide band of data with the revelation of some insightful physical aspects of high energy interactions. The limitations of the approach have also been precisely pointed out in the end.

scholarly journals An Analysis of Transverse Momentum Spectra of Various Jets Produced in High Energy Collisions

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Yang-Ming Tai ◽  
Pei-Pin Yang ◽  
Fu-Hu Liu
Keyword(s):  
Transverse Momentum ◽  
Momentum Distribution ◽  
Thermal Model ◽  
High Energy ◽  
Transverse Momentum Distribution ◽  
High Energies ◽  
Model Distribution ◽  
Momentum Spectra ◽  
Transverse Momentum Spectra ◽  
High Energy Collisions

With the framework of the multisource thermal model, we analyze the experimental transverse momentum spectra of various jets produced in different collisions at high energies. Two energy sources, a projectile participant quark and a target participant quark, are considered. Each energy source (each participant quark) is assumed to contribute to the transverse momentum distribution to be the TP-like function, i.e., a revised Tsallis–Pareto-type function. The contribution of the two participant quarks to the transverse momentum distribution is then the convolution of two TP-like functions. The model distribution can be used to fit the experimental spectra measured by different collaborations. The related parameters such as the entropy index-related, effective temperature, and revised index are then obtained. The trends of these parameters are useful to understand the characteristic of high energy collisions.

Power laws and production of direct photons in high-energy physics

2008 ◽  
Vol 86 (10) ◽  
pp. 1219-1232
Author(s):  
S K Biswas ◽  
G Sau ◽  
P Guptaroy ◽  
B De ◽  
A Bhattacharya ◽  
...  
Keyword(s):  
High Energy Physics ◽  
Power Laws ◽  
High Energy ◽  
Measured Data ◽  
Power Indices ◽  
Direct Photons ◽  
Theoretical Approaches ◽  
Momentum Spectra ◽  
Transverse Momentum Spectra ◽  
Energy Physics

The measured data on transverse momentum spectra for production of direct photons in hadron–hadron, hadron–nucleus, and nucleus–nucleus interactions at high energies are compiled. Besides, data on some other aspects related to these pT-spectra are also assorted in the present work. The pT-spectra for production of direct photons at pT > 1 GeV/c are, then, fitted here by using two parameterizations, which essentially approach the power-law dependence at high transverse momenta. The power indices range between 16 to 7 depending on the interacting particles and the centre-of-mass energy of the system. The power index decreases gradually with increasing energy, with a variation of the rate of fall for various energy ranges. The formulae applied here phenomenologically bring out the main features of the data characteristics in a modestly satisfactory manner. This provokes us to raise some serious questions about the existing “theoretical” approaches, all, or most of which, lack in the first-principle derivations of the actual working expressions used to finally describe the nature of the measured data on direct photons, or for that matter, on any other secondary particle.PACS Nos.: 25.75.–q, 12.38.Mh, 13.85.Ni

New indication on scaling properties of strangeness production in pp collisions at RHIC

2017 ◽  
Vol 32 (05) ◽  
pp. 1750029 ◽  
Author(s):  
M. V. Tokarev ◽  
I. Zborovský
Keyword(s):  
Transverse Momentum ◽  
New Physics ◽  
Self Similarity ◽  
Scaling Properties ◽  
High Energies ◽  
Strange Particles ◽  
Momentum Spectra ◽  
Transverse Momentum Spectra ◽  
Text Presentation ◽  
Fragmentation Processes

Experimental data on transverse momentum spectra of strange particles [Formula: see text] produced in [Formula: see text] collisions at [Formula: see text] obtained by the STAR and PHENIX collaborations at RHIC are analyzed in the framework of [Formula: see text]-scaling approach. The concept of the [Formula: see text]-scaling is based on fundamental principles of self-similarity, locality, and fractality of hadron interactions at high energies. General properties of the data [Formula: see text]-presentation are studied. Self-similarity of fractal structure of protons and fragmentation processes with strange particles is discussed. A microscopic scenario of constituent interactions developed within the [Formula: see text]-scaling scheme is used to study the dependence of momentum fractions and recoil mass on the collision energy, transverse momentum and mass of produced inclusive particle, and to estimate the constituent energy loss. We consider that obtained results can be useful in study of strangeness origin, in searching for new physics with strange probes, and can serve for better understanding of fractality of hadron interactions at small scales.

ON PRODUCTION OF SOME NEUTRAL MESONS IN PION-INDUCED REACTIONS AT HIGH ENERGIES AND AT LARGE TRANSVERSE MOMENTA

2006 ◽  
Vol 15 (03) ◽  
pp. 627-641
Author(s):  
BHASKAR DE ◽  
S. K. BISWAS ◽  
S. BHATTACHARYYA
Keyword(s):  
Phenomenological Model ◽  
High Energy ◽  
Measured Data ◽  
Fair Agreement ◽  
Standard Variety ◽  
High Energies ◽  
Neutral Mesons

The measured data on production of π0 and η mesons at large transverse momenta in high energy π-P and π-Be interactions have here been analyzed with the help of a newly-developed phenomenological model, called Combinational Approach(CA). The results so obtained on the basis of the CA are seen to be in fair agreement with the measured data. Furthermore, the results so obtained have been compared with both some previous measuremnts by the same group and some models of the standard variety type, e.g., PYTHIA, HERWIG.

scholarly journals HADRON PRODUCTION IN NEUTRINO–NUCLEON INTERACTIONS AT HIGH ENERGIES

2003 ◽  
Vol 18 (04) ◽  
pp. 673-683
Author(s):  
M. T. HUSSEIN ◽  
N. M. HASSAN ◽  
W. ELHARBI
Keyword(s):  
Cross Sections ◽  
Particle Production ◽  
High Energy ◽  
Neutrino Energy ◽  
Wave Functions ◽  
Variation Method ◽  
Hypothetical Model ◽  
High Energies ◽  
Color Field

The multi-particle productions in neutrino–nucleon collisions at high energy are investigated through the analysis of the data of the experiment CERN-WA-025 at neutrino energy less than 260 GeV and the experiments FNAL-616 and FNAL-701 at energy range 120–250 GeV. The general features of these experiments are used as base to build a hypothetical model that views the reaction through a Feynman diagram of two vertices. The first of which concerns the weak interaction between the neutrino and the quark constituents of the nucleon. At the second vertex, a strong color field is assumed to play the role of particle production, which depend on the momentum transferred from the first vertex. The wave functions of the nucleon constituent quarks are determined using the variation method and relevant boundary conditions are applied to calculate the deep inelastic cross sections of the virtual diagram.

Analysis of positive pions obtained in d + C collisions at 4.2AGeV/c

2020 ◽  
Vol 29 (06) ◽  
pp. 2050041
Author(s):  
Imran Khan ◽  
Nabeela Feroz ◽  
Ali Zaman ◽  
Naseeb Ullah
Keyword(s):  
Boltzmann Distribution ◽  
High Energy ◽  
Distribution Functions ◽  
Transverse Mass ◽  
Inverse Slope ◽  
Model Calculations ◽  
Momentum Spectra ◽  
Inverse Slope Parameter ◽  
Transverse Momentum Spectra ◽  
High Energy Collisions

Temperature is an important and commonly used parameter among others to study properties of matter created during high energy collisions of nuclei. Experimental data from JINR and UrQMD (version 3.3p2) model simulations have been used to estimate temperature and other properties of positive pions in collisions of deuteron with carbon nuclei at incident momentum of 4.2[Formula: see text]GeV/[Formula: see text] in this paper. Transverse mass and transverse momentum spectra have been used to get inverse slope parameter/temperature of said particles, with the help of some fitting equations. These equations are referred as Hagedorn Thermodynamic and Boltzmann Distribution functions. Such functions or equations are used to describe particles spectra. Temperature of positive pions has been found to be equal to [Formula: see text] and [Formula: see text][Formula: see text]MeV in experimental and model, respectively, using Hagedorn function. Results from both experimental and model calculations have also been compared with each other and thus most reliable fitting function has been suggested. It is found that Hagedorn Thermodynamic function is the most reliable function to get pions’ temperature in said collision system at given momentum. Similarly, results obtained in this paper have been compared with results from other experiments in the world and worthy conclusions have been reached and reported.

scholarly journals THE PROCESSES $gg\to\tilde\chi^+_i\tilde\chi^-_j$, $\tilde\chi^0_i\tilde\chi^0_j$ AT HIGH ENERGIES

2011 ◽  
Vol 26 (07n08) ◽  
pp. 1253-1272
Author(s):  
G. J. GOUNARIS ◽  
J. LAYSSAC ◽  
F. M. RENARD
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
High Energies ◽  
Parity Conservation ◽  
Helicity Conservation ◽  
The One

According to the helicity conservation (HCns) theorem, the sum of the helicities should be conserved, in any 2-to-2 processes in MSSM with R-parity conservation, at high energies, i.e. all amplitudes violating this rule must vanish asymptotically. The realization of HCns in [Formula: see text], [Formula: see text] is studied, at the one-loop electroweak order, and simple high energy expressions are derived for the nonvanishing helicity conserving (HC) amplitudes. These are very similar to the corresponding expressions for gg → W+W-, ZZ, γZ, γγ derived before. Asymptotic relations among observable unpolarized cross-sections for many such processes are then obtained, some of which may hold at LHC-type energies.

ANTIDEUTERON PRODUCTION AND THE PHYSICS OF COALESCENCE: IMPLICATIONS OF A NEW APPROACH

2002 ◽  
Vol 11 (05) ◽  
pp. 387-401
Author(s):  
BHASKAR DE ◽  
S. BHATTACHARYYA ◽  
P. GUPTAROY
Keyword(s):  
High Energy ◽  
Measured Data ◽  
New Combination ◽  
Coalescence Model ◽  
New Approach ◽  
Nuclear Collisions ◽  
High Energies ◽  
Text Production ◽  
Theoretical Results

Within the framework of coalescence model, the problem of antideuteron [Formula: see text] production in some high energy nuclear collisions has here been studied with the help of a new combination of models (NCM) outlined in some detail in the text. The totality of the approach, including one useful parametrization, adopted here leads us to obtain finally some theoretical results which are modestly in agreement with the measured data on various aspects of antideuteron production in both Pb + Pb and Au + Au collisions at moderately high energies. The implications of all this are discussed at the end of the paper.

scholarly journals SMALL-X QCD EFFECTS IN PARTICLE COLLISIONS AT HIGH ENERGIES

2002 ◽  
Vol 17 (23) ◽  
pp. 3185-3203
Author(s):  
TANCREDI CARLI
Keyword(s):  
Perturbative Qcd ◽  
Cross Sections ◽  
High Energy ◽  
Particle Collisions ◽  
Energy Limit ◽  
High Energy Limit ◽  
High Energies ◽  
Small X ◽  
Theoretical Developments

Recent theoretical developments to calculate cross sections of hadronic objects in the high energy limit are summarised and experimental attempts to establish the need for new QCD effects connected with a resummation of small hadron momentum fractions x are reviewed. The relation between small-x parton dynamics and the phenomenon of diffraction is briefly out-lined. In addition, a search for a novel, non-perturbative QCD effect, the production of QCD instanton induced events, is presented.

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