135 documents found, page 1 of 14
Measurement of the CP-violation parameter of B0 mixing and decay with pp̄→μμX data
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.; Agelou, M.; Aguilo, E.; Ahn, S. H.; Ahsan, M.; Alexeev, G. D.Made available in DSpace on 2022-04-28T20:12:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-11-20; We measure the dimuon charge asymmetry A in pp̄ collisions at a center of mass energy s=1960GeV. The data was recorded with the D0 detector and corresponds to an integrated luminosity of approximately 1.0fb-1. Assuming that the asymmetry A is due to asymmetric B0↔B̄0 mixing and decay, we extract the CP-...
Measurement of the top quark mass in the lepton+jets final state with the matri...
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.; Agelou, M.; Aguilo, E.; Ahn, S. H.; Ahsan, M.; Alexeev, G. D.Made available in DSpace on 2022-04-28T20:12:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-12-06; We present a measurement of the top quark mass with the matrix element method in the lepton+jets final state. As the energy scale for calorimeter jets represents the dominant source of systematic uncertainty, the matrix element likelihood is extended by an additional parameter, which is defined as a glo...
Measurement of Bd mixing using opposite-side flavor tagging
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.; Agelou, M.; Aguilo, E.; Ahn, S. H.; Ahsan, M.; Alexeev, G. D.Made available in DSpace on 2022-04-28T20:13:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-12-21; We report on a measurement of the Bd0 mixing frequency and the calibration of an opposite-side flavor tagger in the D0 experiment. Various properties associated with the b quark on the opposite side of the reconstructed B meson are combined using a likelihood-ratio method into a single variable with enh...
Measurement of the tt̄ production cross section in pp̄ collisions at s=1.96TeV ...
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.; Aguilo, E.; Ahn, S. H.; Ahsan, M.; Alexeev, G. D.; Alkhazov, G.; Alton, A.Made available in DSpace on 2022-04-28T20:14:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-12-01; We report a new measurement of the tt̄ production cross section in pp̄ collisions at a center-of-mass energy of 1.96 TeV using events with one charged lepton (electron or muon), missing transverse energy, and jets. Using 425pb-1 of data collected using the D0 detector at the Fermilab Tevatron Collider, ...
Measurement of the W boson helicity in top quark decays at D0
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.; Agelou, M.; Aguilo, E.; Ahn, S. H.; Ahsan, M.; Alexeev, G. D.Made available in DSpace on 2022-04-28T20:15:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-02-05; We present a measurement of the fraction f+ of right-handed W bosons produced in top quark decays, based on a candidate sample of tt̄ events in the +jets and dilepton decay channels corresponding to an integrated luminosity of 370pb-1 collected by the D0 detector at the Fermilab Tevatron pp̄ Collider at...
Lifetime difference and CP-violating phase in the Bs0 system
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.; Aguilo, E.; Ahn, S. H.; Ahsan, M.; Alexeev, G. D.; Alkhazov, G.; Alton, A.Made available in DSpace on 2022-04-28T20:15:41Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-03-21; From an analysis of the decay Bs0→J/ψ, we obtain the width difference between the light and heavy mass eigenstates ΔΓ(ΓL- ΓH)=0.17±0.09(stat)±0.02(syst)ps-1 and the CP-violating phase s=-0.79±0.56(stat)-0.01+0.14(syst). Under the hypothesis of no CP violation (0), we obtain 1/Γ̄=τ̄(Bs0)=1.52±0.08(stat) ...
Measurement of the charge asymmetry in semileptonic Bs0 decays
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.; Aguilo, E.; Ahn, S. H.; Ahsan, M.; Alexeev, G. D.; Alkhazov, G.; Alton, A.Made available in DSpace on 2022-04-28T20:16:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-04-11; We have performed the first direct measurement of the time-integrated flavor untagged charge asymmetry in semileptonic Bs0 decays ASLs,unt by comparing the decay rate of Bs0→μ+Ds-νX, where Ds- π- and →K+K-, with the charge-conjugate B̄s0 decay rate. This sample was selected from 1.3fb-1 of data collecte...
Evidence for production of single top quarks and first direct measurement of |Vtb|
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.; Aguilo, E.; Ahn, S. H.; Ahsan, M.; Alexeev, G. D.; Alkhazov, G.; Alton, A.Made available in DSpace on 2022-04-28T20:16:38Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-05-01; The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron pp̄ collider. Using a 0.9fb-1 dataset, we apply a multivariate analysis to separate signal from background and measure σ(pp̄→tb+X,tqb+X)=4.9±1.4pb. The probability to measure a cross section at ...
Measurement of the top quark mass in the lepton+jets channel using the ideogram...
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.; Aguilo, E.; Ahn, S. H.; Ahsan, M.; Alexeev, G. D.; Alkhazov, G.; Alton, A.Made available in DSpace on 2022-04-28T20:17:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-05-11; A measurement of the top quark mass using events with one charged lepton, missing transverse energy, and jets in the final state, collected by the D0 detector from pp̄ collisions at s=1.96TeV at the Fermilab Tevatron collider, is presented. A constrained fit is used to fully reconstruct the kinematics o...
Measurement of the shape of the boson rapidity distribution for pp̄→Z/γ*→e+e-+X...
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.; Aguilo, E.; Ahn, S. H.; Ahsan, M.; Alexeev, G. D.; Alkhazov, G.; Alton, A.Made available in DSpace on 2022-04-28T20:17:54Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-07-16; We present a measurement of the shape of the boson rapidity distribution for pp̄→Z/γ*→e+e-+X events at a center-of-mass energy of 1.96 TeV. The measurement is made for events with electron-positron mass 71<Mee<111GeV and uses 0.4fb-1 of data collected at the Fermilab Tevatron collider with the D0 detect...