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| Author | : Jodi Lamoureux |
| Publisher | : |
| Total Pages | : 550 |
| Release | : 1993 |
| Genre | : |
| ISBN | : |
| Author | : Sohrab Hossain |
| Publisher | : |
| Total Pages | : 278 |
| Release | : 2009 |
| Genre | : Collisions (Nuclear physics) |
| ISBN | : |
| Author | : James D. Olsen |
| Publisher | : |
| Total Pages | : 394 |
| Release | : 1998 |
| Genre | : |
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| Author | : |
| Publisher | : |
| Total Pages | : 704 |
| Release | : 1995 |
| Genre | : Aeronautics |
| ISBN | : |
| Author | : Thomas Gadfort |
| Publisher | : |
| Total Pages | : 206 |
| Release | : 2007 |
| Genre | : Particles (Nuclear physics) |
| ISBN | : 9780549044628 |
We present the first evidence for electroweak single top quark production using nearly 1 fb-1 of Tevatron Run II data at s = 1.96 TeV. We select single-top-like data events in the lepton+jets decay channel and separate them from backgrounds using the matrix element analysis method. This technique uses leading order matrix elements to compute an event probability for both signal and background hypotheses. Using the expected signal acceptance, background, and observed data we measure the single top quark cross section: spp&d1;→ tb+tqb+X=4.6+1.8-1.5 pb The probability for the background to have fluctuated up to give at least the cross section measured in this analysis is 0.21%, which corresponds to a Gaussian equivalent significance of 2.9sigma.
| Author | : |
| Publisher | : |
| Total Pages | : 46 |
| Release | : 2015 |
| Genre | : |
| ISBN | : |
A search for the production of a heavy B quark, having electric charge -1/3 and vector couplings to W, Z, and H bosons, is carried out using proton-proton collision data recorded at the CERN LHC by the CMS experiment, corresponding to an integrated luminosity of 19.7 fb-1 . The B quark is assumed to be pair-produced and to decay in one of three ways: to tW, bZ, or bH. The search is carried out in final states with one, two, and more than two charged leptons, as well as in fully hadronic final states. Each of the channels in the exclusive final-state topologies is designed to be sensitive to specific combinations of the B quark-antiquark pair decays. The observed event yields are found to be consistent with the standard model expectations in all the fi- nal states studied. Our statistical combination of these results was performed and upper limits were set on the cross section of the strongly produced B quark-antiquark pairs as a function of the B quark mass. Additionally, lower limits on the B quark mass between 740 and 900 GeV are set at a 95% confidence level, depending on the values of the branching fractions of the B quark to tW, bZ, and bH. Overall, these limits are the most stringent to date.
| Author | : Gerry Bauer |
| Publisher | : |
| Total Pages | : 332 |
| Release | : 1986 |
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| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 42 |
| Release | : 2015 |
| Genre | : |
| ISBN | : |
Our search is presented for a singly produced excited bottom quark (b*) decaying to a top quark and a W boson in the all-hadronic, lepton+jets, and dilepton final states in proton-proton collisions at √s = 8 TeV recorded by the CMS experiment at the CERN LHC. Data corresponding to an integrated luminosity of 19.7 fb-1 are used. No significant excess of events is observed with respect to standard model expectations. We set limits at 95% confidence on the product of the b* quark production cross section and its branching fraction to tW. Furthermore, the cross section limits are interpreted for scenarios including left-handed, right-handed, and vector-like couplings of the b* quark and are presented in the two-dimensional coupling plane based on the production and decay coupling constants. The masses of the left-handed, right-handed, and vectorlike b* quark states are excluded at 95% confidence below 1390, 1430, and 1530 GeV, respectively, for benchmark couplings. This analysis gives the most stringent limits on the mass of the b* quark to date.
| Author | : Steven M. Moulding |
| Publisher | : |
| Total Pages | : 193 |
| Release | : 1993 |
| Genre | : Leptons (Nuclear physics) |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2017 |
| Genre | : |
| ISBN | : |
A search is presented for a heavy vector-like quark, decaying into a b quark and a W boson, which is produced singly in association with a light flavor quark and a b quark. The analysis is performed using a data sample of proton-proton collisions at a center-of-mass energy of $\sqrt{s} = $ 13 TeV collected at the LHC in 2015. The data set used in the analysis corresponds to an integrated luminosity of 2.3 inverse-femtobarns. The search is carried out using events containing one electron or muon, at least one b-tagged jet with large transverse momentum, at least one jet in the forward region of the detector, and missing transverse momentum. No excess over the standard model prediction is observed. Upper limits are placed on the production cross section of heavy exotic quarks: a T quark with a charge of 2/3, and a Y quark with a charge of -4/3. For Y quarks with coupling of 0.5 and B(Y to bW) = 100%, the observed (expected) lower mass limits are 1.40 (1.0) TeV. This is the most stringent limit to date on the single production of the Y vector-like quark.
