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Search for the Pair-production of a Vector-like Quark in B + Z Events from Pp Collisions at [radix]s

Search for the Pair-production of a Vector-like Quark in B + Z Events from Pp Collisions at [radix]s PDF Author: 高凱逸
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Languages : en
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Search for the Pair-production of a Vector-like Quark in B + Z Events from Pp Collisions at [radix]s

Search for the Pair-production of a Vector-like Quark in B + Z Events from Pp Collisions at [radix]s PDF Author: 高凱逸
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Languages : en
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Search for a Vectorlike Quark with Charge 2/3 in T+Z Events from Pp Collisions at Sqrt[s]

Search for a Vectorlike Quark with Charge 2/3 in T+Z Events from Pp Collisions at Sqrt[s] PDF Author:
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Languages : en
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A search for pair-produced heavy vector-like charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity of 1.14 inverse femtobarns, the number of observed events is found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T to tZ, a T quark with a mass less than 475 GeV/c2̂ is excluded at the 95% confidence level.

A Search for Bottom-type, Vector-like Quark Pair Production in a Fully Hadronic Final State in Proton-proton Collisions at √s

A Search for Bottom-type, Vector-like Quark Pair Production in a Fully Hadronic Final State in Proton-proton Collisions at √s PDF Author: Albert M. Sirunyan
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Languages : en
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Search for Same-sign Top-quark Pair Production at Sqrt(s)

Search for Same-sign Top-quark Pair Production at Sqrt(s) PDF Author:
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Languages : en
Pages : 22

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An inclusive search for same-sign top-quark pair production in pp collisions at sqrt(s) = 7 TeV is performed using a data sample recorded with the CMS detector in 2010, corresponding to an integrated luminosity of 35 inverse picobarns. This analysis is motivated by recent studies of p p-bar to t t-bar reporting mass-dependent forward-backward asymmetries larger than expected from the standard model. These asymmetries could be due to Flavor Changing Neutral Currents (FCNC) in the top sector induced by t-channel exchange of a massive neutral vector boson (Z'). Models with such a Z' also predict enhancement of same-sign top-pair production in pp or p p-bar collisions. Limits are set as a function of the Z' mass and its couplings to u and t quarks. These limits disfavour the FCNC interpretation of the Tevatron results.

Search for Single Production of Vector-like Quarks Decaying Into Wb in Pp Collisions at Sqrt(s)

Search for Single Production of Vector-like Quarks Decaying Into Wb in Pp Collisions at Sqrt(s) PDF Author: Dustin Biedermann
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Languages : en
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Search for Single Production of Vector-like Quarks Decaying Into Wb in Pp Collisions at √s

Search for Single Production of Vector-like Quarks Decaying Into Wb in Pp Collisions at √s PDF Author: Dustin Biedermann
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Languages : en
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Search for Pair Production of Vector-like T and B Quarks in Single-lepton Final States Using Boosted Jet Substructure in Proton-proton Collisions at √s

Search for Pair Production of Vector-like T and B Quarks in Single-lepton Final States Using Boosted Jet Substructure in Proton-proton Collisions at √s PDF Author:
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Languages : en
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Search for Single Production of a Vector-like Partner of the Bottom Quark in the BH(bb) Final State in Pp Collisions at √s

Search for Single Production of a Vector-like Partner of the Bottom Quark in the BH(bb) Final State in Pp Collisions at √s PDF Author: Marco Montella
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Languages : en
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Study of the Underlying Event in Top Quark Pair Production in $\mathrm P}\mathrm P}$ Collisions at 13 $~\text Te}\text V}$

Study of the Underlying Event in Top Quark Pair Production in $\mathrm P}\mathrm P}$ Collisions at 13 $~\text Te}\text V}$ PDF Author: Albert M. Sirunyan
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Languages : en
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Observation of Top-quark Pair Production in Association with a Photon and Measurement of the Tt{u00AF}? Production Cross Section in pp Collisions at {u221A}s

Observation of Top-quark Pair Production in Association with a Photon and Measurement of the Tt{u00AF}? Production Cross Section in pp Collisions at {u221A}s PDF Author:
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Languages : en
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A search is performed for top-quark pairs (tt¯) produced together with a photon (?) with transverse energy greater than 20 GeV using a sample of tt¯ candidate events in final states with jets, missing transverse momentum, and one isolated electron or muon. The data set used corresponds to an integrated luminosity of 4.59 fb−1 of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. In total, 140 and 222 tt¯? candidate events are observed in the electron and muon channels, to be compared to the expectation of 79 ± 26 and 120 ± 39 non-tt¯? background events, respectively. The production of tt¯? events is observed with a significance of 5.3 standard deviations away from the null hypothesis. The tt¯? production cross section times the branching ratio (BR) of the single-lepton decay channel is measured in a fiducial kinematic region within the ATLAS acceptance. The measured value is ?fidtt¯? × BR = 63 ± 8(stat)+17–13(syst) ± 1(lumi) fb per lepton flavor, in good agreement with the leading-order theoretical calculation normalized to the next-to-leading-order theoretical prediction of 48 ± 10 fb.