Measurement of the differential $\gamma+2~b$-jet cross section and the ratio $\sigma$($\gamma+2~b$-jets)/$\sigma$($\gamma+b$-jet) in $p\bar{p}$ collisions at $\sqrt{s}$=1.96 TeV
V.M. Abazov
,
G. Bernardi
(1)
,
D. Brown
(1)
,
Y. Enari
(1)
,
S. Greder
(2)
,
G. Grenier
(3)
,
T. Kurca
(3)
,
P. Lebrun
(3)
,
J. Lellouch
(1)
,
D. Li
(1)
,
I. Ripp-Baudot
(2)
,
L. Zivkovic
(1)
,
J.-F. Grivaz
(4)
,
T. Guillemin
(4)
,
M. Jaffré
(4)
,
P. Pétroff
(4)
,
G. Sajot
(5)
,
J. Stark
(5)
,
M.-C. Cousinou
(6)
,
A. Duperrin
(6)
,
W. Geng
(6)
,
E. Kajfasz
(6)
,
S. Kermiche
(6)
,
E. Nagy
(6)
,
N. Osman
(6)
,
F. Badaud
(7)
,
Ph. Gris
(7)
1
LPNHE -
Laboratoire de Physique Nucléaire et de Hautes Énergies
2 DRS-IPHC - Département Recherches Subatomiques
3 IPNL - Institut de Physique Nucléaire de Lyon
4 LAL - Laboratoire de l'Accélérateur Linéaire
5 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
6 CPPM - Centre de Physique des Particules de Marseille
7 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
2 DRS-IPHC - Département Recherches Subatomiques
3 IPNL - Institut de Physique Nucléaire de Lyon
4 LAL - Laboratoire de l'Accélérateur Linéaire
5 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
6 CPPM - Centre de Physique des Particules de Marseille
7 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
V.M. Abazov
- Function : Author
G. Bernardi
- Function : Author
- PersonId : 1374140
- ORCID : 0000-0002-2837-2442
- IdRef : 088561623
P. Lebrun
- Function : Author
- PersonId : 741027
- IdHAL : patrice-jean-marie-lebrun
- ORCID : 0000-0001-6115-5856
E. Kajfasz
- Function : Author
- PersonId : 742630
- IdHAL : eric-kajfasz
- ORCID : 0000-0002-8575-405X
- IdRef : 150389043
Abstract
We present the first measurements of the differential cross section $d\sigma/dp_{T}^{\gamma}$ for the production of an isolated photon in association with at least two $b$-quark jets. The measurements consider photons with rapidities $|y^\gamma| < 1.0$ and transverse momenta $30 < p_{T}^{\gamma} < 200$~\GeV. The $b$-quark jets are required to have $p_T^{jet}>15$ GeV and $| y^{jet}| < 1.5$. The ratio of differential production cross sections for $\gamma+2~b$-jets to $\gamma+b$-jet as a function of $p_{T}^{\gamma}$ is also presented. The results are based on the proton-antiproton collision data at $\sqrt{s}=$1.96~\TeV collected with the D0 detector at the Fermilab Tevatron Collider. The measured cross sections and their ratios are compared to the next-to-leading order perturbative QCD calculations as well as predictions based on the $k_{T}$-factorization approach and those from the SHERPA and PYTHIA Monte Carlo event generators.