Measurement of the production cross sections for a Z boson and one or more b jets in pp collisions at sqrt(s) = 7 TeV
S. Chatrchyan
,
S. Baffioni
(1)
,
F. Beaudette
(1)
,
L. Benhabib
(1)
,
M. Bluj
(1)
,
P. Busson
(1)
,
C. Charlot
(1)
,
N. Daci
(1)
,
T. Dahms
(1)
,
M. Dalchenko
(1)
,
L. Dobrzynski
(1)
,
A. Florent
(1)
,
R. Granier de Cassagnac
(1)
,
M. Haguenauer
(1)
,
P. Mine
(1)
,
C. Mironov
(1)
,
I.N. Naranjo
(1)
,
M. Nguyen
(1)
,
C. Ochando
(1)
,
P. Paganini
(1)
,
D. Sabes
(1)
,
R. Salerno
(1)
,
Y. Sirois
(1)
,
C. Veelken
(1)
,
A. Zabi
(1)
,
J.-L. Agram
(2)
,
J. Andrea
(2)
,
D. Bloch
(2)
,
J.-M. Brom
(2)
,
E.C. Chabert
(2)
,
C. Collard
(2)
,
E. Conte
(2)
,
F. Drouhin
(2)
,
J.-C. Fontaine
(2)
,
D. Gele
(2)
,
U. Goerlach
(2)
,
C. Goetzmann
(2)
,
P. Juillot
(2)
,
A.-C. Le Bihan
(2)
,
P. van Hove
(2)
,
S. Gadrat
(3)
,
S. Beauceron
(4)
,
N. Beaupere
(4)
,
G. Boudoul
(4)
,
S. Brochet
(4)
,
J. Chasserat
(4)
,
R. Chierici
(4)
,
D. Contardo
(4)
,
P. Depasse
(4)
,
H. El Mamouni
(4)
,
J. Fay
(4)
,
S. Gascon
(4)
,
M. Gouzevitch
(4)
,
B. Ille
(4)
,
T. Kurca
(4)
,
M. Lethuillier
(4)
,
L. Mirabito
(4)
,
S. Perries
(4)
,
L. Sgandurra
(4)
,
V. Sordini
(4)
,
M. Vander Donckt
(4)
,
P. Verdier
(4)
,
S. Viret
(4)
S. Chatrchyan
- Function : Author
S. Baffioni
- Function : Author
- PersonId : 20331
- IdHAL : stephanie-barrillon
- ORCID : 0000-0002-7075-1673
P. Busson
- Function : Author
- PersonId : 741166
- IdHAL : phbusson
- ORCID : 0000-0001-6027-4511
- IdRef : 033562466
R. Granier de Cassagnac
- Function : Author
- PersonId : 739189
- IdHAL : raphgrandecass
- ORCID : 0000-0002-1275-7292
- IdRef : 132136651
C. Mironov
- Function : Author
- PersonId : 1196248
- IdHAL : camelia-mironov
P. Paganini
- Function : Author
- PersonId : 739173
- IdHAL : pascal-paganini
- ORCID : 0000-0001-9580-683X
- IdRef : 183219406
J.-L. Agram
- Function : Author
- PersonId : 1147753
- IdHAL : j-l-agram
- ORCID : 0000-0001-7476-0158
- IdRef : 090333748
C. Collard
- Function : Author
- PersonId : 753602
- IdHAL : caroline-collard
- ORCID : 0000-0002-5230-8387
- IdRef : 223465992
E. Conte
- Function : Author
- PersonId : 755000
- IdHAL : eric-conte
- ORCID : 0000-0003-3154-3123
- IdRef : 122530209
P. van Hove
- Function : Author
- PersonId : 742701
- IdHAL : pierre-van-hove
- ORCID : 0000-0002-2431-3381
- IdRef : 264250834
M. Gouzevitch
- Function : Author
- PersonId : 741096
- IdHAL : maxime-gouzevitch
- ORCID : 0000-0002-5524-880X
- IdRef : 13627160X
M. Lethuillier
- Function : Author
- PersonId : 740178
- IdHAL : morgan-lethuillier
- ORCID : 0000-0001-6185-2045
- IdRef : 090177835
V. Sordini
- Function : Author
- PersonId : 739810
- IdHAL : viola-sordini
- ORCID : 0000-0003-0885-824X
- IdRef : 128184035
S. Viret
- Function : Author
- PersonId : 1093632
- IdHAL : seb-viret
- ORCID : 0000-0002-1935-623X
Abstract
The production of a Z boson, decaying into two leptons and produced in association with one or more b jets, is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7 TeV. The data were recorded in 2011 with the CMS detector and correspond to an integrated luminosity of 5 inverse femtobarns. The Z(ll)+b-jets cross sections (where ll = mu mu or ee) are measured for a Z boson produced with exactly one or at least two b jets. In addition, a cross section ratio is extracted for a Z boson produced with at least one b jet relative to a Z boson produced with at least one jet. The measured cross sections are compared to various theoretical predictions, and the data favour the predictions in the five-flavour scheme, where b quarks are assumed massless. The kinematic properties of the reconstructed particles are compared with the predictions from the MADGRAPH event generator using the PYTHIA parton shower simulation.