scholarly journals DIRECT PHOTON PRODUCTION IN pp AND $p {\bar p}$ COLLISIONS AT HIGH ENERGIES

2007 ◽  
Vol 22 (02n03) ◽  
pp. 541-545
Author(s):  
TOMASZ PIETRYCKI ◽  
ANTONI SZCZUREK
Keyword(s):  
Transverse Momentum ◽  
Cross Sections ◽  
Good Description ◽  
Photon Production ◽  
Low Energy ◽  
Direct Photon ◽  
Parton Distributions ◽  
High Energies ◽  
Direct Photon Production ◽  
Standing Problem

The invariant cross sections for direct photon production in hadron-hadron collisions are calculated for several initial energies (SPS, ISR, [Formula: see text], RHIC, Tevatron, LHC) including initial parton transverse momenta within the formalism of unintegrated parton distributions (UPDF). Kwieciński UPDFs provide very good description of all world data, especially at SPS and ISR energies. Inclusion of the QCD evolution effects and especially their effect on initial parton transverse momenta allowed to solve the long-standing problem of understanding the low energy and low transverse momentum data.

Measurement of direct photon production at Tevatron fixed target energies

2005 ◽  
Vol 20 (16) ◽  
pp. 3756-3758
Author(s):  
◽  
MICHAEL BEGEL
Keyword(s):  
Transverse Momentum ◽  
Cross Sections ◽  
Photon Production ◽  
Direct Photon ◽  
Fixed Target ◽  
Direct Photons ◽  
Proton Beams ◽  
Direct Photon Production

Measurements of the production of high-pT direct photons by a 515 GeV/c π- beam and 530 and 800 GeV/c proton beams in interactions with Be and H 2 targets are presented. The data span the kinematic ranges of 3.5 < pT < 12 GeV/c in transverse momentum and 1.5 units in rapidity. The inclusive direct-photon cross sections are compared with NLO pQCD calculations and expectations based on a phenomenological parton-kT model.

DIRECT PHOTON PRODUCTION IN HIGH ENERGY HADRONIC AND NUCLEAR COLLISIONS: MEASURED DATA VERSUS A MODEL

2003 ◽  
Vol 18 (27) ◽  
pp. 5047-5068 ◽  
Author(s):  
P. GUPTAROY ◽  
BHASKAR DE ◽  
S. BHATTACHARYYA
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Photon Production ◽  
Direct Photon ◽  
Direct Photons ◽  
Nuclear Collisions ◽  
High Energies ◽  
Successful Attempt ◽  
Direct Photon Production ◽  
Very High

This work is in response to the stimulus received from our fairly successful attempt at understanding in the recent past the problem of direct photon production only in gold–gold and lead–lead collisions from the viewpoint of a non-standard approach. The same nonconventional formalism would, once again, be applied to analyze the vast array of measurements on the inclusive cross sections of direct photons produced in several purely nuclear or hadronuclear collisions at very high energies. Besides, some of the cross section ratios would also be calculated and be compared with data on them. All this reveals and indicates a modest agreement between the model-based calculations and the actual measurements. The authors would also endeavor here to adduce the reasons for the discrepancies, if any.

scholarly journals Direct photon production at low transverse momentum in proton-proton collisions at s=2.76 and 8 TeV

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
S. Acharya ◽  
F. T.-. Acosta ◽  
D. Adamová ◽  
J. Adolfsson ◽  
M. M. Aggarwal ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Photon Production ◽  
Direct Photon ◽  
Proton Proton ◽  
Proton Collisions ◽  
Direct Photon Production ◽  
8 Tev ◽  
Proton Proton 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 Measurement of direct photon production at large transverse momentum inπ−p,π+p, andppcollisions at 300 GeV/c

1987 ◽  
Vol 36 (1) ◽  
pp. 8-15 ◽  
Author(s):  
C. De Marzo ◽  
M. De Palma ◽  
C. Favuzzi ◽  
G. Maggi ◽  
E. Nappi ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Photon Production ◽  
Direct Photon ◽  
Large Transverse Momentum ◽  
Direct Photon Production

scholarly journals A new determination of αs using direct photon production cross sections in pp and collisions at GeV

1999 ◽  
Vol 452 (1-2) ◽  
pp. 201-206 ◽  
Author(s):  
M Werlen ◽  
G Ballocchi ◽  
R.E Breedon ◽  
L Camilleri ◽  
C Comtat ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Photon Production ◽  
Direct Photon ◽  
Direct Photon Production
Sign in / Sign up

Export Citation Format

Share Document