scholarly journals Measurement of the Nuclear Dependence of Direct Photon and Neutral Meson Production at High Transverse Momentum by Negative 515-GeV/c Pions Incident on Beryllium and Copper Targets

1995 ◽  
Author(s):  
Lee Ronald Sorrell
Keyword(s):  
Transverse Momentum ◽  
Meson Production ◽  
Direct Photon ◽  
Neutral Meson ◽  
High Transverse Momentum ◽  
Nuclear Dependence

scholarly journals Direct Photon Measurements with the ALICE Experiment at the LHC

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 1
Author(s):  
Erwann Masson ◽  
on behalf of the ALICE Collaboration
Keyword(s):  
Transverse Momentum ◽  
High Energy ◽  
Direct Photon ◽  
High Transverse Momentum ◽  
Alice Experiment ◽  
Direct Photons ◽  
Proton Proton ◽  
Small Systems ◽  
Energy Hadron

In high-energy hadron collisions, direct photons can be produced in various processes andare of particular interest to study the hot QCD medium since they escape it without being affected.These proceedings present the latest ALICE experiment results concerning direct photon productionin proton-proton (pp), proton-lead (p–Pb) and lead-lead (Pb–Pb) collisions. All measurements agreewith pQCD calculations at high transverse momentum (pT) and show no direct photon excess at lowpT in small systems while a low-pT signal is found in central Pb–Pb collisions.

scholarly journals Inclusiveπ0,η, and direct photon production at high transverse momentum inp+pandd+Aucollisions atsNN=200GeV

2010 ◽  
Vol 81 (6) ◽  
Author(s):  
B. I. Abelev ◽  
M. M. Aggarwal ◽  
Z. Ahammed ◽  
A. V. Alakhverdyants ◽  
B. D. Anderson ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Photon Production ◽  
Direct Photon ◽  
High Transverse Momentum ◽  
Direct Photon Production

scholarly journals J/ψ meson production in SIDIS: matching high and low transverse momentum

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Daniël Boer ◽  
Umberto D’Alesio ◽  
Francesco Murgia ◽  
Cristian Pisano ◽  
Pieter Taels
Keyword(s):  
Transverse Momentum ◽  
Meson Production ◽  
Distance Matrix ◽  
Inelastic Electron ◽  
High Transverse Momentum ◽  
Shape Functions ◽  
Long Distance ◽  
Collinear Factorization ◽  
Transverse Momentum Dependent ◽  
Gluon Distributions

Abstract We consider the transverse momentum spectrum and the cos 2ϕ azimuthal distribution of J/ψ mesons produced in semi-inclusive, deep-inelastic electron-proton scattering, where the electron and the proton are unpolarized. At low transverse momentum, we propose factorized expressions in terms of transverse momentum dependent gluon distributions and shape functions. We show that our formulae, at the order αs, correctly match with the collinear factorization results at high transverse momentum. The latter are computed at the order $$ {\alpha}_s^2 $$ α s 2 in the framework of nonrelativistic QCD (NRQCD), with the inclusion of the intermediate $$ {}^3{S}_1^{\left[1\right]} $$ 3 S 1 1 color-singlet Fock state, as well as the subleading color-octet ones that are relatively suppressed by a factor v4 in the NRQCD velocity parameter v. We show that the $$ {}^1{S}_0^{\left[8\right]} $$ 1 S 0 8 and $$ {}^3{P}_J^{\left[8\right]} $$ 3 P J 8 (J = 0, 1, 2) contributions diverge in the small transverse momentum region and allow us to determine the perturbative tails of the shape functions, which carry the same quantum numbers. These turn out to be identical, except for the overall magnitude given by the appropriate NRQCD long distance matrix element.

scholarly journals High transverse momentum η meson production inp+p,d+Au, and Au+Au collisions atsNN=200GeV

2007 ◽  
Vol 75 (2) ◽  
Author(s):  
S. S. Adler ◽  
S. Afanasiev ◽  
C. Aidala ◽  
N. N. Ajitanand ◽  
Y. Akiba ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Meson Production ◽  
High Transverse Momentum
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