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Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Agnew, J. P.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Askew, A.; Atkins, S.; Augsten, K.; Avila, C.; Badaud, F.; Bagby, L.; Baldin, B.; Bandurin, D. V.; Banerjee, S.; Barberis, E.; Baringer, P.; Bartlett, J. F.; Bassler, U.; Bazterra, V.; Bean, A.; Begalli, M.; Bellantoni, L.; Beri, S. B.; Bernardi, G.; Bernhard, R.; Bertram, I.; Besancon, M.; Beuselinck, R.; Bhat, P. C.; Boehnlein, A.; Boline, D.; Boos, E. E.; Borissov, G.; Borysova, M.; Brandt, A.; Brandt, O.; Brock, R.; Bross, A.; Brown, D.; Bu, X. B.; Buehler, M.; Buescher, V.; Bunichev, V.; Burdin, S.; Buszello, C. P.; Camacho-Perez, E.; Nunnemann, Thomas (2014): Measurement of the differential γ +2b-jet cross section and the ratio σ(γ +2b-jets)/σ(γ +b-jet) in p¯p collisions at √s = 1.96 TeV. In: Physics Letters B, Vol. 737: pp. 357-365




We present the first measurements of the differential cross section dσ/dpγ T for the production of an isolated photon in association with at least two b-quark jets. The measurements consider photons with rapidities |yγ | < 1.0 and transverse momenta 30 < pγT < 200 GeV. The b-quark jets are required to have pjetT > 15 GeVand |yjet| < 1.5. The ratio of differential production cross sections for γ + 2 b-jets to γ +b-jet as a function of pγT is also presented. The results are based on the proton–antiproton collision data at √s = 1.96 TeVcollected with the D0 detector at the Fermilab Tevatron Collider. The measured cross sections and their ratios are compared to the next-to-leading order perturbative QCD calculations as well as predictions based on the kT-factorization approach and those from the sherpa and pythia Monte Carlo event generators.