34 documents found, page 1 of 4
Measurement of the differential cross section dσ/dt in elastic pp̄ scattering a...
Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Aoki, M.Made available in DSpace on 2022-04-28T18:57:43Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-07-27; We present a measurement of the elastic differential cross section dσ(pp̄→pp̄)/dt as a function of the four-momentum-transfer squared t. The data sample corresponds to an integrated luminosity of ≈31nb -1 collected with the D0 detector using dedicated Tevatron pp̄ Collider operating conditions at √s=1.9...
Measurement of sin2θeff and Z-light quark couplings using the forward-backward ...
Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Ancu, L. S.Made available in DSpace on 2022-04-28T23:48:22Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-07-26; National Science Foundation; We measure the mass dependence of the forward-backward charge asymmetry in 157553 pp̄→Z/γ*→e+e- interactions, corresponding to 5.0fb-1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider at √s=1.96 TeV. The effective weak mixing angle (θ...
Measurement of the ZZ production cross section in pp̄ collisions at √s=1.96TeV
Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Ancu, L. S.Made available in DSpace on 2022-04-28T23:48:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-07-06; National Science Foundation; We present a new measurement of the production cross section σ(pp̄→ZZ) at a center-of-mass energy √s=1.96TeV, obtained from the analysis of the four charged lepton final state + -′+′- (, ′=e or μ). We observe ten candidate events with an expected background of 0.37±0.13 even...
Bounds on an anomalous dijet resonance in W+jets production in pp̄ collisions a...
Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Aoki, M.; Arov, M.Made available in DSpace on 2022-04-28T23:59:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-06-30; National Science Foundation; We present a study of the dijet invariant mass spectrum in events with two jets produced in association with a W boson in data corresponding to an integrated luminosity of 4.3fb-1 collected with the D0 detector at √s=1.96TeV. We find no evidence for anomalous resonant dijet ...
Measurement of spin correlation in tt̄ production using a matrix element approach
Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Ancu, L. S.Made available in DSpace on 2022-04-29T00:12:20Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-07-14; National Science Foundation; We determine the fraction of tt̄ events with spin correlation, assuming that the spin of the top quark is either correlated with the spin of the top antiquark as predicted by the standard model or is uncorrelated. For the first time we use a matrix-element-based approach to ...
Precise measurement of the top quark mass in the dilepton channel at D0
Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Ancu, L. S.Made available in DSpace on 2022-04-29T00:13:29Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-08-19; National Science Foundation; We measure the top quark mass (mt) in pp̄ collisions at a center of mass energy √s=1.96TeV using dilepton tt̄→W +bW-b̄→+νb -ν̄b̄ events, where denotes an electron, a muon, or a tau that decays leptonically. The data correspond to an integrated luminosity of 5.4fb-1 collected...
Measurement of the production fraction times branching fraction f(b→Λb)•B(Λb→J/ψΛ)
Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Ancu, L. S.Made available in DSpace on 2022-04-29T00:49:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-08-04; National Science Foundation; The Λb(udb) baryon is observed in the decay Λb→J/ψΛ using 6.1fb-1 of pp̄ collisions collected with the D0 detector at √s=1.96TeV. The production fraction multiplied by the branching fraction for this decay relative to that for the decay B0→J/ψKs0 is measured to be 0.345±0.03...
Precise measurement of the top-quark mass from lepton+jets events at D0
Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Ancu, L. S.Made available in DSpace on 2022-04-29T00:49:59Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-08-09; National Science Foundation; We report a measurement of the mass of the top quark in lepton+jets final states of pp̄→tt̄ data corresponding to 2.6fb-1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider. A matrix-element method is developed that combines an in situ ...
Precision measurement of the ratio B(t→Wb)/B(t→Wq) and extraction of Vtb
Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Aoki, M.; Arov, M.Made available in DSpace on 2022-04-29T00:50:16Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-09-15; National Science Foundation; We present a measurement of the ratio of top quark branching fractions R=B(t→Wb)/B(t→Wq), where q can be a d, s, or b quark, in the lepton+jets and dilepton tt̄ final states. The measurement uses data from 5.4fb-1 of pp̄ collisions collected with the D0 detector at the Fermi...
Direct measurement of the mass difference between top and antitop quarks
Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Aoki, M.; Arov, M.Made available in DSpace on 2022-04-29T01:01:43Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-09-14; We present a direct measurement of the mass difference between top and antitop quarks (Δm) in lepton+jets tt̄ final states using the matrix element method. The purity of the lepton+jets sample is enhanced for tt̄ events by identifying at least one of the jets as originating from a b quark. The analyzed ...