Measurement of B anti-B Angular Correlations based on Secondary Vertex Reconstruction at sqrt(s)=7 TeV

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.

References in corpus (12)

• PYTHIA 6.4 Physics and Manual
• Updated predictions for the total production cross sections of top and of heavier quark pairs at the Tevatron and at the LHC
• QCD radiation in the production of heavy colored particles at the LHC
• Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7\TeV$
• The CCFM Monte Carlo generator CASCADE 2.2.0
• CMS Tracking Performance Results from early LHC Operation
• Measurement of sigma(pp -> b anti-b X) at \sqrt(s)=7 TeV in the forward region
• First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at sqrt(s)=7 TeV
• Forward Jet Production at the Large Hadron Collider
• Inclusive b-hadron production cross section with muons in pp collisions at sqrt(s) = 7 TeV
• Proceedings of the First International Workshop on Multiple Partonic Interactions at the LHC (MPI08)
• Determination of the Jet Energy Scale

Cited by in corpus (56)

• Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
• Theoretical predictions for charm and bottom production at the LHC
• Search for resonant pair production of Higgs bosons decaying to two bottom quark-antiquark pairs in proton-proton collisions at 8 TeV
• Open Heavy Flavor in QCD Matter and in Nuclear Collisions
• Azimuthal correlations of heavy quarks in Pb+Pb collisions at LHC ($\sqrt{s}=2.76$ TeV)
• Scale-invariant resonance tagging in multijet events and new physics in Higgs pair production
• Evidence of b-jet quenching in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Heavy-flavor production and medium properties in high-energy nuclear collisions - What next?
• Measurement of the cross section and angular correlations for associated production of a Z boson with b hadrons in pp collisions at sqrt(s) = 7 TeV
• Boosting Higgs pair production in the $b\bar{b}b\bar{b}$ final state with multivariate techniques
• Inclusive b-jet production in pp collisions at sqrt(s)=7 TeV
• Search for direct production of supersymmetric partners of the top quark in the all-jets final state in proton-proton collisions at sqrt(s) = 13 TeV
• Search for direct top squark pair production in events with one lepton, jets, and missing transverse momentum at 13 TeV with the CMS experiment
• Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Search for top squark production in fully-hadronic final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at sqrt(s) = 8 TeV
• A deep neural network to search for new long-lived particles decaying to jets
• $B\bar{B}$ angular correlations at the LHC in parton Reggeization approach merged with higher-order matrix elements
• Measurements of $\mu \mu$ pairs from open heavy flavor and Drell-Yan in $p+p$ collisions at $\sqrt{s}=200$ GeV
• Performance of the CMS high-level trigger during LHC Run 2
• Search for the pair production of third-generation squarks with two-body decays to a bottom or charm quark and a neutralino in proton-proton collisions at sqrt(s) = 13 TeV
• Investigation of beauty production and parton shower effects at LHC
• Production of charged heavy quarkonium-like states at the LHC and the Tevatron
• Disentangling Heavy Flavor at Colliders
• Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at sqrt(s[NN]) = 5.02 TeV
• Measurement of the production of charm jets tagged with D${}^0$ mesons in pp collisions at $\sqrt{s}$= 7 TeV
• Machine Learning in High Energy Physics: A review of heavy-flavor jet tagging at the LHC
• Heavy Flavor Azimuthal Correlations in Cold Nuclear Matter
• A new calibration method for charm jet identification validated with proton-proton collision events at $\sqrt{s}$ = 13 TeV
• Observation of enhanced double parton scattering in proton-lead collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV
• Searches for R-parity-violating supersymmetry in pp collisions at sqrt(s) = 8 TeV in final states with 0-4 leptons
• Measurement of the flavour composition of dijet events in pp collisions at sqrt{s}=7 TeV with the ATLAS detector
• Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• Properties of $g\to b\bar{b}$ at small opening angles in $pp$ collisions with the ATLAS detector at $\sqrt{s}=13$ TeV
• Heavy quark radiation in NLO+PS POWHEG generators
• Hard Processes in Proton-Proton Collisions at the Large Hadron Collider
• Heavy flavor angular correlations as a direct probe of the glasma
• $b\bar{b}$ Kinematic Correlations in Cold Nuclear Matter
• Measurement of the $b\overline{b}$ dijet cross section in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• The impact of glasma on heavy flavor azimuthal correlations and spectra
• Measurement of differential cross sections for Z bosons produced in association with charm jets in pp collisions at $\sqrt{s}=$ 13 TeV
• Measurement of the production cross section for a W boson in association with a charm quark in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Charm energy loss and D-D correlations from a shower picture
• The different energy loss mechanisms of inclusive and b-tagged reconstructed jets within ultra-relativistic heavy-ion collisions
• Performance of heavy-flavour jet identification in Lorentz-boosted topologies in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Production of forward heavy-flavour dijets at the LHCb within $k_T$-factorization approach
• A database for quarkonium and open heavy-flavour production in hadronic collisions with HepData
• Measurement of cross-sections for production of a $Z$ boson in association with a flavor-inclusive or doubly $b$-tagged large-radius jet in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS experiment
• Moriond 2012, QCD and High Energy Interactions: Experimental Summary
• General search for supersymmetric particles in scenarios with compressed mass spectra using proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Modelling and tuning in top quark physics
• Bose-Einstein correlations and b-bbar correlations in pp collisions with LHCb
• Production and Spectroscopy of Heavy Hadrons at the LHC
• Heavy Flavor Production at CMS
• Heavy quark jets at the LHC
• Investigating charm production and fragmentation via azimuthal correlations of prompt D mesons with charged particles in pp collisions at $\sqrt{s}=13$ TeV