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This paper reports a measurement of the cross section for the pair production of top quarks in p (p) over bar collisions at root s = 1.96 TeV at the Fermilab Tevatron. The data were collected from the CDF run II detector in a set of runs with a total integrated luminosity of 1.1 fb(-1). The cross section is measured in the dilepton channel, the subset of t (t) over bar events in which both top quarks decay through t -> Wb -> l nu b, where l = e, mu, or tau. The lepton pair is reconstructed as one identified electron or muon and one isolated track. The use of an isolated track to identify the second lepton increases the t (t) over bar acceptance, particularly for the case in which one W decays as W -> tau nu. The purity of the sample may be further improved at the cost of a reduction in the number of signal events, by requiring an identified b jet. We present the results of measurements performed with and without the request of an identified b jet. The former is the first published CDF result for which a b-jet requirement is added to the dilepton selection. In the CDF data there are 129 pretag lepton + track candidate events, of which 69 are tagged. With the tagging information, the sample is divided into tagged and untagged subsamples, and a combined cross section is calculated by maximizing a likelihood. The result is sigma(t (t) over bar) = (9.6 +/- 1.2(stat)(-0.5)(+0.6)(sys) +/- 0.6(lum)) pb, assuming a branching ratio of BR(W -> l nu) = 10.8% and a top mass of m(t) = 175 GeV/c(2).
T., A., J., A., T., A., B. A., G., S., A., D., A., et al. (2009). Measurement of the t(t)over-bar cross section in p(p)over-bar collisions at root s=1.96 TeV using dilepton events with a lepton plus track selection. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 79(11), 112007-1-112007-41 [10.1103/PhysRevD.79.112007].
Measurement of the t(t)over-bar cross section in p(p)over-bar collisions at root s=1.96 TeV using dilepton events with a lepton plus track selection
T. Aaltonen;J. Adelman;T. Akimoto;B. A. Gonzalez;S. Amerio;D. Amidei;A. Anastassov;A. Annovi;J. Antos;G. Apollinari;A. Apresyan;T. Arisawa;A. Artikov;W. Ashmanskas;A. Attal;A. Aurisano;F. Azfar;W. Badgett;A. Barbaro Galtieri;V. E. Barnes;B. A. Barnett;P. Barria;V. Bartsch;G. Bauer;P. H. Beauchemin;F. Bedeschi;D. Beecher;S. Behari;G. Bellettini;J. Bellinger;D. Benjamin;A. Beretvas;J. Beringer;A. Bhatti;M. Binkley;D. Bisello;I. Bizjak;R. E. Blair;C. Blocker;B. Blumenfeld;A. Bocci;A. Bodek;V. Boisvert;G. Bolla;D. Bortoletto;J. Boudreau;A. Boveia;B. Brau;A. Bridgeman;L. Brigliadori;C. Bromberg;E. Brubaker;J. Budagov;H. S. Budd;S. Budd;S. Burke;K. Burkett;G. Busetto;P. Bussey;A. Buzatu;K. L. Byrum;S. Cabrera;C. Calancha;M. Campanelli;M. Campbell;F. Canelli;A. Canepa;B. Carls;D. Carlsmith;R. Carosi;S. Carrillo;S. Carron;B. Casal;M. Casarsa;A. Castro;P. Catastini;D. Cauz;V. Cavaliere;M. Cavalli Sforza;A. Cerri;L. Cerrito;S. H. Chang;Y. C. Chen;M. Chertok;G. Chiarelli;G. Chlachidze;F. 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2009-01-01
Abstract
This paper reports a measurement of the cross section for the pair production of top quarks in p (p) over bar collisions at root s = 1.96 TeV at the Fermilab Tevatron. The data were collected from the CDF run II detector in a set of runs with a total integrated luminosity of 1.1 fb(-1). The cross section is measured in the dilepton channel, the subset of t (t) over bar events in which both top quarks decay through t -> Wb -> l nu b, where l = e, mu, or tau. The lepton pair is reconstructed as one identified electron or muon and one isolated track. The use of an isolated track to identify the second lepton increases the t (t) over bar acceptance, particularly for the case in which one W decays as W -> tau nu. The purity of the sample may be further improved at the cost of a reduction in the number of signal events, by requiring an identified b jet. We present the results of measurements performed with and without the request of an identified b jet. The former is the first published CDF result for which a b-jet requirement is added to the dilepton selection. In the CDF data there are 129 pretag lepton + track candidate events, of which 69 are tagged. With the tagging information, the sample is divided into tagged and untagged subsamples, and a combined cross section is calculated by maximizing a likelihood. The result is sigma(t (t) over bar) = (9.6 +/- 1.2(stat)(-0.5)(+0.6)(sys) +/- 0.6(lum)) pb, assuming a branching ratio of BR(W -> l nu) = 10.8% and a top mass of m(t) = 175 GeV/c(2).
T., A., J., A., T., A., B. A., G., S., A., D., A., et al. (2009). Measurement of the t(t)over-bar cross section in p(p)over-bar collisions at root s=1.96 TeV using dilepton events with a lepton plus track selection. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 79(11), 112007-1-112007-41 [10.1103/PhysRevD.79.112007].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/38340
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