# Measurement of BB ̄ angular correlations based on secondary vertex reconstruction at √s = 7 TeV

CMS Collaboration; Chiochia, V; Amsler, C; Favaro, C; Verzetti, M; Storey, J; Snoek, H; Aguiló, E; De Visscher, S; Millan, B; Ivova, M; Otyugova, P; Schmitt, A (2011). Measurement of BB ̄ angular correlations based on secondary vertex reconstruction at √s = 7 TeV. Journal of High Energy Physics, (3):136.

## Abstract

A measurement of the angular correlations between beauty and anti-beauty hadrons (B B-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-bar production cross section, measured from a data sample collected by CMS and corresponding to an integrated luminosity of 3.1 inverse picobarns, shows that a sizable fraction of the B B-bar pairs are produced with small opening angles. These studies provide a test of QCD and further insight into the dynamics of b b-bar production.

## Abstract

A measurement of the angular correlations between beauty and anti-beauty hadrons (B B-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-bar production cross section, measured from a data sample collected by CMS and corresponding to an integrated luminosity of 3.1 inverse picobarns, shows that a sizable fraction of the B B-bar pairs are produced with small opening angles. These studies provide a test of QCD and further insight into the dynamics of b b-bar production.

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Other titles: Measurement of B anti-B angular correlations based on secondary vertex reconstruction at sqrt(s)=7 TeV Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2011 14 Feb 2012 19:03 05 Apr 2016 15:36 Springer 1126-6708 (P) 1029-8479 (E) The original publication is available at www.springerlink.com https://doi.org/10.1007/JHEP03(2011)136 http://arxiv.org/abs/1102.3194

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