On Z=2 Projectile Fragments Emitted in the Interactions of 3.7A GeV 28Si in Nuclear Emulsions

1998 ◽  
Vol 07 (03) ◽  
pp. 341-355 ◽  
Author(s):  
B. K. Singh ◽  
S. K. Tuli
Keyword(s):  
Excitation Energy ◽  
Cross Sections ◽  
Mass Number ◽  
Multiplicity Distribution ◽  
Production Cross ◽  
Emission Angle ◽  
Single Source ◽  
Momentum Spread ◽  
Nuclear Emulsions ◽  
Scaling Behaviour

We report the results on partial production cross sections for Z=2 projectile fragments emitted in 28Si-emulsion interactions at 3.7 A GeV. Scaling behaviour of the multiplicity distribution of Z=2 PFs has been checked. The emission angle of Z=2 PFs has been measured and pseudorapidity distributions for these PFs have been obtained. We observe that the value of momentum spread σ(p) for Z=2 PFs grows with increasing mass number of the projectile. The emission of Z=2 PFs is consistent with a single source with an excitation energy of about 8.9 MeV. The data has been compared with available data reported for lighter as well as heavier projectiles at the same and/or different energies.

STUDY OF ANGULAR DISTRIBUTION OF HELIUM PROJECTILE FRAGMENTS IN INTERACTIONS OF 200 A GeV 32S IONS WITH EMULSION NUCLEI

1993 ◽  
Vol 08 (01) ◽  
pp. 21-31 ◽  
Author(s):  
◽  
M.I. ADAMOVICH ◽  
M.M. AGGARWAL ◽  
Y.A. ALEXANDROV ◽  
N.P. ANDREEVA ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Excitation Energy ◽  
High Precision ◽  
Minimum Bias ◽  
Single Source ◽  
Momentum Spread ◽  
Break Up ◽  
Average Excitation Energy ◽  
Bulk Part ◽  
Helium Emission

This paper presents data on the emission of helium fragments due to break up of 200 A GeV 32S ions in collision with emulsion nuclei. A total of 499 minimum bias events have been studied in an emulsion stack and 97 events in emulsion chambers. Emission angles of He fragments have been measured with high precision. This data has been compared with data of breakup of heavier as well as lighter projectiles and we observe that the value of the momentum spread, σ(p), increases with increasing projectile mass. The bulk part of the helium emission is consistent with a single source for helium fragments with an average excitation energy of (9.1±0.9) MeV. A tail of a few (<1%) He fragments with higher momenta is observed.

INTERACTIONS OF RELATIVISTIC 24Mg NUCLEI WITH EMULSION NUCLEI AT 4.5 GeV/c PER NUCLEON

1995 ◽  
Vol 04 (04) ◽  
pp. 815-825 ◽  
Author(s):  
M.A. JILANY ◽  
N.N. ABD ALLAH ◽  
A. ABD-ELDAIM
Keyword(s):  
Cross Sections ◽  
Energy Region ◽  
Nuclear Emulsion ◽  
Multiplicity Distribution ◽  
Scaling Function ◽  
Nuclear Emulsions ◽  
Secondary Particles ◽  
Inelastic Interactions ◽  
Free Hydrogen ◽  
The Masses

Nuclear emulsions are used to investigate spallations produced by 108 GeV/c 24Mg nuclei. The main experimental characteristics (inelastic cross-sections and multiplicities of various types of secondary particles and their dependence on the masses of the colliding nuclei) in inelastic interactions of 24Mg nuclei with nuclei of nuclear emulsion at 4.5 GeV/c per nucleon have been studied. The integral multiplicity distribution of disintegrated particles from target nuclei is used to separate the inelastic interactions with the free hydrogen (H), the light (CNO), and the heavy (AgBr) nuclei. Multiplicity scaling in the shower particles obeys a scaling function of Koba-Neilsen-Olesen (KNO) type in this energy region.

Relativistic calculations of M-shell photoionization and X-ray production cross-sections for Hg at 5.96keV excitation energy

2015 ◽  
Vol 107 ◽  
pp. 36-39 ◽  
Author(s):  
J.M. Sampaio ◽  
T.I. Madeira ◽  
F. Parente ◽  
P. Indelicato ◽  
J.P. Santos ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Cross Sections ◽  
Production Cross ◽  
X Ray

scholarly journals Double-Differential Production Cross Sections of Charged Pions in Charged Pion Induced Nuclear Reactions at High Momentums

2014 ◽  
Vol 2014 ◽  
pp. 1-20 ◽  
Author(s):  
Ya-Qin Gao ◽  
Tian Tian ◽  
S. Fakhraddin ◽  
Magda A. Rahim ◽  
Fu-Hu Liu
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Production Cross ◽  
Emission Angle ◽  
Erlang Distribution ◽  
Distribution Width ◽  
Source Contributions ◽  
Charged Pions ◽  
The Mean ◽  
Source Number

The double-differentialπ±production cross sections in interactions of charged pions on targets at high momentums are analyzed by using a multicomponent Erlang distribution which is obtained in the framework of a multisource thermal model. The calculated results are compared and found to be in agreement with the experimental data at the incident momentums of 3, 5, 8, and 12 GeV/c measured by the HARP Collaboration. It is found that the source contributions to the mean momentum of charged particles and to the distribution width of particle momentums decrease with increase of the emission angle, and the source number and temperature do not show an obvious dependence on the emission angle of the considered particle.

HELIUM PROJECTILE FRAGMENT EMISSION IN INTERACTIONS OF 197Au WITH EMULSION AT 10.7A GeV

2008 ◽  
Vol 17 (07) ◽  
pp. 1319-1326 ◽  
Author(s):  
YING YUAN ◽  
DONG-HAI ZHANG ◽  
FU-HU LIU
Keyword(s):  
Cross Sections ◽  
Mass Number ◽  
Production Cross ◽  
High Energies ◽  
Projectile Fragment ◽  
Multiplicity Distributions

The total and partial production cross-sections of the multiple helium fragments emitted in 10.7A GeV 197 Au –emulsion interactions are reported and compared with those obtained from different projectiles at high energies. The multiplicity distributions of the helium fragments exhibit a KNO scaling. The dependence of Cq moments and 〈nα〉 on the mass number of the incident beams is plotted.

scholarly journals Collinear expansion for color singlet cross sections

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Markus A. Ebert ◽  
Bernhard Mistlberger ◽  
Gherardo Vita
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Production Cross ◽  
Gluon Fusion ◽  
Building Blocks ◽  
Color Singlet ◽  
Final State ◽  
Beam Function ◽  
Kinematic Limit ◽  
State Radiation

Abstract We demonstrate how to efficiently expand cross sections for color-singlet production at hadron colliders around the kinematic limit of all final state radiation being collinear to one of the incoming hadrons. This expansion is systematically improvable and applicable to a large class of physical observables. We demonstrate the viability of this technique by obtaining the first two terms in the collinear expansion of the rapidity distribution of the gluon fusion Higgs boson production cross section at next-to-next-to leading order (NNLO) in QCD perturbation theory. Furthermore, we illustrate how this technique is used to extract universal building blocks of scattering cross section like the N-jettiness and transverse momentum beam function at NNLO.

scholarly journals Heavy-flavor hadro-production with heavy-quark masses renormalized in the $$ \overline{\mathrm{MS}} $$, MSR and on-shell schemes

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
M. V. Garzelli ◽  
L. Kemmler ◽  
S. Moch ◽  
O. Zenaiev
Keyword(s):  
Heavy Quark ◽  
Cross Sections ◽  
Top Quark ◽  
Quark Mass ◽  
Production Cross ◽  
Hadron Collider ◽  
Distribution Functions ◽  
Heavy Flavor ◽  
Parton Distribution Functions ◽  
Heavy Quark Mass

Abstract We present predictions for heavy-quark production at the Large Hadron Collider making use of the $$ \overline{\mathrm{MS}} $$ MS ¯ and MSR renormalization schemes for the heavy-quark mass as alternatives to the widely used on-shell renormalization scheme. We compute single and double differential distributions including QCD corrections at next-to-leading order and investigate the renormalization and factorization scale dependence as well as the perturbative convergence in these mass renormalization schemes. The implementation is based on publicly available programs, MCFM and xFitter, extending their capabilities. Our results are applied to extract the top-quark mass using measurements of the total and differential $$ t\overline{t} $$ t t ¯ production cross-sections and to investigate constraints on parton distribution functions, especially on the gluon distribution at low x values, from available LHC data on heavy-flavor hadro-production.

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