Artigo
Measurement of B(B)over-bar angular correlations based on secondary vertex reconstruction at root s=7 TeV
Fecha
2011-03-01Registro en:
Journal of High Energy Physics. New York: Springer, n. 3, p. 35, 2011.
1126-6708
10.1007/JHEP03(2011)136
WOS:000289295300064
WOS000289295300064.pdf
Autor
Yerevan Phys Inst
Inst Hochenergiephys OeAW
Natl Ctr Particle & High Energy Phys
Univ Antwerp
Vrije Univ Brussel
Univ Libre Brussels
Univ Ghent
Catholic Univ Louvain
Univ Mons
Centro Brasileiro de Pesquisas Físicas (CBPF)
Universidade do Estado do Rio de Janeiro (UERJ)
Universidade Estadual Paulista (Unesp)
Bulgarian Acad Sci
Univ Sofia
Inst High Energy Phys
Peking Univ
Universidad de los Andes
Tech Univ Split
Univ Split
Rudjer Boskovic Inst
Univ Cyprus
Charles Univ Prague
Acad Sci Res & Technol Arab Republ Egypt
NICPB
Univ Helsinki
Helsinki Inst Phys
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CNRS
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Ecole Polytech
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IN2P3
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Georgian Acad Sci
Tbilisi State Univ
RWTH Aachen University
Deutsch Elekt Synchrotron
Univ Hamburg
Univ Karlsruhe
Inst Nucl Phys Demokritos
Univ Athens
Univ Ioannina
KFKI Res Inst Particle & Nucl Phys
Inst Nucl Res ATOMKI
Univ Debrecen
Panjab Univ
University of Delhi
Bhabha Atom Res Ctr
Tata Inst Fundamental Res
Inst Res & Fundamental Sci IPM
Ist Nazl Fis Nucl
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Politecn Bari
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Resumen
A measurement of the angular correlations between beauty and anti-beauty hadrons (B (B) over bar) produced in pp collisions at a centre-of-mass energy of 7 TeV at the CERN LHC is presented, probing for the first time the region of small angular separation. The B hadrons are identified by the presence of displaced secondary vertices from their decays. The B hadron angular separation is reconstructed from the decay vertices and the primary-interaction vertex. The differential B (B) over bar production cross section, measured from a data sample collected by CMS and corresponding to an integrated luminosity of 3.1 pb(-1), shows that a sizable fraction of the B (B) over bar pairs are produced with small opening angles. These studies provide a test of QCD and further insight into the dynamics of b (b) over bar production.