Measurement of $$B\bar{B}$$ Angular Correlations based on Secondary Vertex Reconstruction at $$\sqrt{s}=7$$ TeV
- Yerevan Physics Inst. (Armenia)
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.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- CMS Collaboration
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1155736
- Report Number(s):
- FERMILAB-PUB-11-768-CMS; CERN-PH-EP-10-093; arXiv eprint number arXiv:1102.3194
- Journal Information:
- Journal of High Energy Physics, Vol. 2011, Issue 3
- Publisher:
- Springer Berlin
- Country of Publication:
- United States
- Language:
- English
Similar Records
Analysis of the Wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at $ \sqrt{s}=8 $ TeV with the ATLAS detector
Top physics: measurement of the tt-bar production cross section in p anti-p collisions at s**(1/2) = 1.96 tev using lepton + jets events with secondary vertex b-tagging