Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √ s... more Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √ s NN = 2.76 TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 µb −1 . The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from v 2 to v 6 , are extracted as a function of particle transverse momentum. At higher transverse momentum, the v 2 harmonic becomes significantly smaller than the higher-order v n (n ≥ 3). The p T -averaged v 2 and v 3 are found to be equal within 2%, while higher-order v n decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. A comparison of the factorization data to hydrodynamic predictions with event-byevent fluctuating initial conditions is also presented. Submitted to the Journal of High Energy Physics c 2013 CERN for the benefit of the CMS Collaboration. CC-BY-3.0 license arXiv:1312.1845v1 [nucl-ex]
We present results from searches for the top quark pp¯ collisions at the Fermilab Tevatron Collid... more We present results from searches for the top quark pp¯ collisions at the Fermilab Tevatron Collider. The data sample was collected during 1988–89 with the Collider Detector at Fermilab and has an integrated luminosity of 4.1 pb -1 . Our previous search for eμ final states for ...
We presentthe results of a search in pp collisions at+ s= 1. 8 TeV for the top quark decaying to ... more We presentthe results of a search in pp collisions at+ s= 1. 8 TeV for the top quark decaying to a charged Higgs boson (H=). We search for dilepton final states from the decay chain tt HH (or HW, or WW)+ bb ll+ X. In a sample of 19. 3 pb'collected during 1992—93 with the Collider Detector at Fermilab,~ e observe 2 events with a background estimation of 3. 0~ 1.0 events. Limits at 95% CL in the (M „v, MB-) plane are presented. For the case M „v (M~+ Mt „we exclude at 95% CL the entire (M „v, Mtt-) plane for the branching ratio B (H 7 v) larger ...
The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider a... more The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider are compared with leading order QCD matrix element predictions, QCD parton shower Monte Carlo predictions, and the predictions from a model in which events are distributed uniformly over the available multibody phase-space. Multijet distributions corresponding to (4N-4) variables that span the N-body parameter space are found to be well described by the QCD calculations for inclusive three-jet, four-jet, and five-jet
In this paper we report on measurements of the branching ratios of B→ c1 0 (1P) K and B→ J/K obse... more In this paper we report on measurements of the branching ratios of B→ c1 0 (1P) K and B→ J/K observed in pp interactions at a center of mass energy of s 1.8 TeV. These decay modes were observed in a data sample of an integrated luminosity of 110 pb 1, using the decay channels c1 0 (1P)→ J/ and J/→. Here and throughout this paper, reference to a specific state implies the charge-conjugate state as well. The current Particle Data Group values for these branching ratios are based on measurements by ARGUS 1, 2 and CLEO 3, 4 using ...
This paper reports an updated measurement of the standard model CP violation parameter sin 2β usi... more This paper reports an updated measurement of the standard model CP violation parameter sin 2β using the CDF Detector at Fermilab. The entire run I data sample of 110 pb -1 of proton-antiproton collisions at sqrt[s]=1.8 TeV is used to identify a signal sample of ∼400 B→J/ψ K S 0 ...
Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √ s... more Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √ s NN = 2.76 TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 µb −1 . The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from v 2 to v 6 , are extracted as a function of particle transverse momentum. At higher transverse momentum, the v 2 harmonic becomes significantly smaller than the higher-order v n (n ≥ 3). The p T -averaged v 2 and v 3 are found to be equal within 2%, while higher-order v n decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. A comparison of the factorization data to hydrodynamic predictions with event-byevent fluctuating initial conditions is also presented. Submitted to the Journal of High Energy Physics c 2013 CERN for the benefit of the CMS Collaboration. CC-BY-3.0 license arXiv:1312.1845v1 [nucl-ex]
We present results from searches for the top quark pp¯ collisions at the Fermilab Tevatron Collid... more We present results from searches for the top quark pp¯ collisions at the Fermilab Tevatron Collider. The data sample was collected during 1988–89 with the Collider Detector at Fermilab and has an integrated luminosity of 4.1 pb -1 . Our previous search for eμ final states for ...
We presentthe results of a search in pp collisions at+ s= 1. 8 TeV for the top quark decaying to ... more We presentthe results of a search in pp collisions at+ s= 1. 8 TeV for the top quark decaying to a charged Higgs boson (H=). We search for dilepton final states from the decay chain tt HH (or HW, or WW)+ bb ll+ X. In a sample of 19. 3 pb'collected during 1992—93 with the Collider Detector at Fermilab,~ e observe 2 events with a background estimation of 3. 0~ 1.0 events. Limits at 95% CL in the (M „v, MB-) plane are presented. For the case M „v (M~+ Mt „we exclude at 95% CL the entire (M „v, Mtt-) plane for the branching ratio B (H 7 v) larger ...
The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider a... more The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider are compared with leading order QCD matrix element predictions, QCD parton shower Monte Carlo predictions, and the predictions from a model in which events are distributed uniformly over the available multibody phase-space. Multijet distributions corresponding to (4N-4) variables that span the N-body parameter space are found to be well described by the QCD calculations for inclusive three-jet, four-jet, and five-jet
In this paper we report on measurements of the branching ratios of B→ c1 0 (1P) K and B→ J/K obse... more In this paper we report on measurements of the branching ratios of B→ c1 0 (1P) K and B→ J/K observed in pp interactions at a center of mass energy of s 1.8 TeV. These decay modes were observed in a data sample of an integrated luminosity of 110 pb 1, using the decay channels c1 0 (1P)→ J/ and J/→. Here and throughout this paper, reference to a specific state implies the charge-conjugate state as well. The current Particle Data Group values for these branching ratios are based on measurements by ARGUS 1, 2 and CLEO 3, 4 using ...
Measurements of the total and differential cross sections d= dpB Tand d= dyB for B þ mesons produ... more Measurements of the total and differential cross sections d= dpB Tand d= dyB for B þ mesons produced in pp collisions at ffiffiffi sp ž 7 TeV are presented. The data correspond to an integrated luminosity of 5: 8 pbĀ1 collected by the CMS experiment operating at the LHC. The exclusive decay B þ! J= cKþ, with J= c! þ Ā, is used to detect B þ mesons and to measure the production cross section as a function of pB Tand yB. The total cross section for pB T> 5 GeV and jyBj< 2: 4 is measured to be 28: 1 Æ 2: 4 Æ 2: 0 Æ 3: 1 b, where the first ...
Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √ s... more Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √ s NN = 2.76 TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 µb −1 . The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from v 2 to v 6 , are extracted as a function of particle transverse momentum. At higher transverse momentum, the v 2 harmonic becomes significantly smaller than the higher-order v n (n ≥ 3). The p T -averaged v 2 and v 3 are found to be equal within 2%, while higher-order v n decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. A comparison of the factorization data to hydrodynamic predictions with event-byevent fluctuating initial conditions is also presented. Submitted to the Journal of High Energy Physics c 2013 CERN for the benefit of the CMS Collaboration. CC-BY-3.0 license arXiv:1312.1845v1 [nucl-ex]
We present results from searches for the top quark pp¯ collisions at the Fermilab Tevatron Collid... more We present results from searches for the top quark pp¯ collisions at the Fermilab Tevatron Collider. The data sample was collected during 1988–89 with the Collider Detector at Fermilab and has an integrated luminosity of 4.1 pb -1 . Our previous search for eμ final states for ...
We presentthe results of a search in pp collisions at+ s= 1. 8 TeV for the top quark decaying to ... more We presentthe results of a search in pp collisions at+ s= 1. 8 TeV for the top quark decaying to a charged Higgs boson (H=). We search for dilepton final states from the decay chain tt HH (or HW, or WW)+ bb ll+ X. In a sample of 19. 3 pb'collected during 1992—93 with the Collider Detector at Fermilab,~ e observe 2 events with a background estimation of 3. 0~ 1.0 events. Limits at 95% CL in the (M „v, MB-) plane are presented. For the case M „v (M~+ Mt „we exclude at 95% CL the entire (M „v, Mtt-) plane for the branching ratio B (H 7 v) larger ...
The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider a... more The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider are compared with leading order QCD matrix element predictions, QCD parton shower Monte Carlo predictions, and the predictions from a model in which events are distributed uniformly over the available multibody phase-space. Multijet distributions corresponding to (4N-4) variables that span the N-body parameter space are found to be well described by the QCD calculations for inclusive three-jet, four-jet, and five-jet
In this paper we report on measurements of the branching ratios of B→ c1 0 (1P) K and B→ J/K obse... more In this paper we report on measurements of the branching ratios of B→ c1 0 (1P) K and B→ J/K observed in pp interactions at a center of mass energy of s 1.8 TeV. These decay modes were observed in a data sample of an integrated luminosity of 110 pb 1, using the decay channels c1 0 (1P)→ J/ and J/→. Here and throughout this paper, reference to a specific state implies the charge-conjugate state as well. The current Particle Data Group values for these branching ratios are based on measurements by ARGUS 1, 2 and CLEO 3, 4 using ...
This paper reports an updated measurement of the standard model CP violation parameter sin 2β usi... more This paper reports an updated measurement of the standard model CP violation parameter sin 2β using the CDF Detector at Fermilab. The entire run I data sample of 110 pb -1 of proton-antiproton collisions at sqrt[s]=1.8 TeV is used to identify a signal sample of ∼400 B→J/ψ K S 0 ...
Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √ s... more Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √ s NN = 2.76 TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 µb −1 . The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from v 2 to v 6 , are extracted as a function of particle transverse momentum. At higher transverse momentum, the v 2 harmonic becomes significantly smaller than the higher-order v n (n ≥ 3). The p T -averaged v 2 and v 3 are found to be equal within 2%, while higher-order v n decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. A comparison of the factorization data to hydrodynamic predictions with event-byevent fluctuating initial conditions is also presented. Submitted to the Journal of High Energy Physics c 2013 CERN for the benefit of the CMS Collaboration. CC-BY-3.0 license arXiv:1312.1845v1 [nucl-ex]
We present results from searches for the top quark pp¯ collisions at the Fermilab Tevatron Collid... more We present results from searches for the top quark pp¯ collisions at the Fermilab Tevatron Collider. The data sample was collected during 1988–89 with the Collider Detector at Fermilab and has an integrated luminosity of 4.1 pb -1 . Our previous search for eμ final states for ...
We presentthe results of a search in pp collisions at+ s= 1. 8 TeV for the top quark decaying to ... more We presentthe results of a search in pp collisions at+ s= 1. 8 TeV for the top quark decaying to a charged Higgs boson (H=). We search for dilepton final states from the decay chain tt HH (or HW, or WW)+ bb ll+ X. In a sample of 19. 3 pb'collected during 1992—93 with the Collider Detector at Fermilab,~ e observe 2 events with a background estimation of 3. 0~ 1.0 events. Limits at 95% CL in the (M „v, MB-) plane are presented. For the case M „v (M~+ Mt „we exclude at 95% CL the entire (M „v, Mtt-) plane for the branching ratio B (H 7 v) larger ...
The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider a... more The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider are compared with leading order QCD matrix element predictions, QCD parton shower Monte Carlo predictions, and the predictions from a model in which events are distributed uniformly over the available multibody phase-space. Multijet distributions corresponding to (4N-4) variables that span the N-body parameter space are found to be well described by the QCD calculations for inclusive three-jet, four-jet, and five-jet
In this paper we report on measurements of the branching ratios of B→ c1 0 (1P) K and B→ J/K obse... more In this paper we report on measurements of the branching ratios of B→ c1 0 (1P) K and B→ J/K observed in pp interactions at a center of mass energy of s 1.8 TeV. These decay modes were observed in a data sample of an integrated luminosity of 110 pb 1, using the decay channels c1 0 (1P)→ J/ and J/→. Here and throughout this paper, reference to a specific state implies the charge-conjugate state as well. The current Particle Data Group values for these branching ratios are based on measurements by ARGUS 1, 2 and CLEO 3, 4 using ...
Measurements of the total and differential cross sections d= dpB Tand d= dyB for B þ mesons produ... more Measurements of the total and differential cross sections d= dpB Tand d= dyB for B þ mesons produced in pp collisions at ffiffiffi sp ž 7 TeV are presented. The data correspond to an integrated luminosity of 5: 8 pbĀ1 collected by the CMS experiment operating at the LHC. The exclusive decay B þ! J= cKþ, with J= c! þ Ā, is used to detect B þ mesons and to measure the production cross section as a function of pB Tand yB. The total cross section for pB T> 5 GeV and jyBj< 2: 4 is measured to be 28: 1 Æ 2: 4 Æ 2: 0 Æ 3: 1 b, where the first ...
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