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Title: Evidence for top quark production in [ital [bar p]p] collisions at [radical][ital s] =1. 8 TeV

Abstract

We present the results of a search for the top quark in 19.3 pb[sup [minus]1] of [ital [bar p]p] collisions at [radical][ital s] =1.8 TeV. The data were collected at the Fermilab Tevatron collider using the Collider Detector at Fermilab (CDF). The search includes standard model [ital t[bar t]] decays to final states [ital ee][nu][bar [nu]], [ital e][mu][nu][bar [nu]], and [mu][mu][nu][bar [nu]] as well as [ital e]+[nu]+jets or [mu]+[nu]+jets. In the ([ital e],[mu])+[nu]+jets channel we search for [ital b] quarks from [ital t] decays via secondary vertex identification and via semileptonic decays of the [ital b] and cascade [ital c] quarks. In the dilepton final states we find two events with a background of 0.56[sub [minus]0.13][sup +0.25] events. In the [ital e],[mu]+[nu]+jets channel with a [ital b] identified via a secondary vertex, we find six events with a background of 2.3[plus minus]0.3. With a [ital b] identified via a semileptonic decay, we find seven events with a background of 3.1[plus minus]0.3. The secondary vertex and semileptonic-decay samples have three events in common. The probability that the observed yield is consistent with the background is estimated to be 0.26%. The statistics are too limited to firmly establish the existence of themore » top quark; however, a natural interpretation of the excess is that it is due to [ital t[bar t]] production. We present several cross-checks. Some support this hypothesis; others do not. Under the assumption that the excess yield over background is due to [ital t[bar t]], constrained fitting on a subset of the events yields a mass of 174[plus minus]10[sub [minus]12][sup +13] GeV/[ital c][sup 2] for the top quark. The [ital t[bar t]] cross section, using this top quark mass to compute the acceptance, is measured to be 13.9[sub [minus]4.8][sup +6.1] pb.« less

Authors:
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Publication Date:
OSTI Identifier:
6999374
Resource Type:
Journal Article
Journal Name:
Physical Review, D (Particles Fields); (United States)
Additional Journal Information:
Journal Volume: 50:5; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PROTON-ANTIPROTON INTERACTIONS; PARTICLE PRODUCTION; TOP PARTICLES; BEAUTY PARTICLES; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; JETS; QUARKS; STANDARD MODEL; TEV RANGE; ACCELERATORS; BARYON-BARYON INTERACTIONS; CYCLIC ACCELERATORS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; HADRON-HADRON INTERACTIONS; INTERACTIONS; MATHEMATICAL MODELS; NUCLEON-ANTINUCLEON INTERACTIONS; PARTICLE INTERACTIONS; PARTICLE MODELS; POSTULATED PARTICLES; SYNCHROTRONS; UNIFIED GAUGE MODELS; 662440* - Properties of Other Particles Including Hypothetical Particles- (1992-); 662340 - Hadron Interactions- (1992-)

Citation Formats

Abe, F., Albrow, M.G., Amendolia, S.R., Amidei, D., Antos, J., Anway-Wiese, C., Apollinari, G., Areti, H., Auchincloss, P., Austern, M., Azfar, F., Azzi, P., Bacchetta, N., Badgett, W., Bailey, M.W., Bao, J., de Barbaro, P., Barbaro-Galtieri, A., Barnes, V.E., Barnett, B.A., Bartalini, P., Bauer, G., Baumann, T., Bedeschi, F., Behrends, S., Belforte, S., Bellettini, G., Bellinger, J., Benjamin, D., Benlloch, J., Bensinger, J., Benton, D., Beretvas, A., Berge, J.P., Bertolucci, S., Bhatti, A., Biery, K., Binkley, M., Bird, F., Bisello, D., Blair, R.E., Blocker, C., Bodek, A., Bolognesi, V., Bortoletto, D., Boswell, C., Boulos, T., Brandenburg, G., Buckley-Geer, E., Budd, H.S., Burkett, K., Busetto, G., Byon-Wagner, A., Byrum, K.L., Campagnari, C., Campbell, M., Caner, A., Carithers, W., Carlsmith, D., Castro, A., Cen, Y., Cervelli, F., Chapman, J., Cheng, M., Chiarelli, G., Chikamatsu, T., Cihangir, S., Clark, A.G., Cobal, M., Contreras, M., Conway, J., Cooper, J., Cordelli, M., Coupal,, and CDF Collaboration). Evidence for top quark production in [ital [bar p]p] collisions at [radical][ital s] =1. 8 TeV. United States: N. p., 1994. Web. doi:10.1103/PhysRevD.50.2966.
Abe, F., Albrow, M.G., Amendolia, S.R., Amidei, D., Antos, J., Anway-Wiese, C., Apollinari, G., Areti, H., Auchincloss, P., Austern, M., Azfar, F., Azzi, P., Bacchetta, N., Badgett, W., Bailey, M.W., Bao, J., de Barbaro, P., Barbaro-Galtieri, A., Barnes, V.E., Barnett, B.A., Bartalini, P., Bauer, G., Baumann, T., Bedeschi, F., Behrends, S., Belforte, S., Bellettini, G., Bellinger, J., Benjamin, D., Benlloch, J., Bensinger, J., Benton, D., Beretvas, A., Berge, J.P., Bertolucci, S., Bhatti, A., Biery, K., Binkley, M., Bird, F., Bisello, D., Blair, R.E., Blocker, C., Bodek, A., Bolognesi, V., Bortoletto, D., Boswell, C., Boulos, T., Brandenburg, G., Buckley-Geer, E., Budd, H.S., Burkett, K., Busetto, G., Byon-Wagner, A., Byrum, K.L., Campagnari, C., Campbell, M., Caner, A., Carithers, W., Carlsmith, D., Castro, A., Cen, Y., Cervelli, F., Chapman, J., Cheng, M., Chiarelli, G., Chikamatsu, T., Cihangir, S., Clark, A.G., Cobal, M., Contreras, M., Conway, J., Cooper, J., Cordelli, M., Coupal,, & CDF Collaboration). Evidence for top quark production in [ital [bar p]p] collisions at [radical][ital s] =1. 8 TeV. United States. doi:10.1103/PhysRevD.50.2966.
Abe, F., Albrow, M.G., Amendolia, S.R., Amidei, D., Antos, J., Anway-Wiese, C., Apollinari, G., Areti, H., Auchincloss, P., Austern, M., Azfar, F., Azzi, P., Bacchetta, N., Badgett, W., Bailey, M.W., Bao, J., de Barbaro, P., Barbaro-Galtieri, A., Barnes, V.E., Barnett, B.A., Bartalini, P., Bauer, G., Baumann, T., Bedeschi, F., Behrends, S., Belforte, S., Bellettini, G., Bellinger, J., Benjamin, D., Benlloch, J., Bensinger, J., Benton, D., Beretvas, A., Berge, J.P., Bertolucci, S., Bhatti, A., Biery, K., Binkley, M., Bird, F., Bisello, D., Blair, R.E., Blocker, C., Bodek, A., Bolognesi, V., Bortoletto, D., Boswell, C., Boulos, T., Brandenburg, G., Buckley-Geer, E., Budd, H.S., Burkett, K., Busetto, G., Byon-Wagner, A., Byrum, K.L., Campagnari, C., Campbell, M., Caner, A., Carithers, W., Carlsmith, D., Castro, A., Cen, Y., Cervelli, F., Chapman, J., Cheng, M., Chiarelli, G., Chikamatsu, T., Cihangir, S., Clark, A.G., Cobal, M., Contreras, M., Conway, J., Cooper, J., Cordelli, M., Coupal,, and CDF Collaboration). Thu . "Evidence for top quark production in [ital [bar p]p] collisions at [radical][ital s] =1. 8 TeV". United States. doi:10.1103/PhysRevD.50.2966.
@article{osti_6999374,
title = {Evidence for top quark production in [ital [bar p]p] collisions at [radical][ital s] =1. 8 TeV},
author = {Abe, F. and Albrow, M.G. and Amendolia, S.R. and Amidei, D. and Antos, J. and Anway-Wiese, C. and Apollinari, G. and Areti, H. and Auchincloss, P. and Austern, M. and Azfar, F. and Azzi, P. and Bacchetta, N. and Badgett, W. and Bailey, M.W. and Bao, J. and de Barbaro, P. and Barbaro-Galtieri, A. and Barnes, V.E. and Barnett, B.A. and Bartalini, P. and Bauer, G. and Baumann, T. and Bedeschi, F. and Behrends, S. and Belforte, S. and Bellettini, G. and Bellinger, J. and Benjamin, D. and Benlloch, J. and Bensinger, J. and Benton, D. and Beretvas, A. and Berge, J.P. and Bertolucci, S. and Bhatti, A. and Biery, K. and Binkley, M. and Bird, F. and Bisello, D. and Blair, R.E. and Blocker, C. and Bodek, A. and Bolognesi, V. and Bortoletto, D. and Boswell, C. and Boulos, T. and Brandenburg, G. and Buckley-Geer, E. and Budd, H.S. and Burkett, K. and Busetto, G. and Byon-Wagner, A. and Byrum, K.L. and Campagnari, C. and Campbell, M. and Caner, A. and Carithers, W. and Carlsmith, D. and Castro, A. and Cen, Y. and Cervelli, F. and Chapman, J. and Cheng, M. and Chiarelli, G. and Chikamatsu, T. and Cihangir, S. and Clark, A.G. and Cobal, M. and Contreras, M. and Conway, J. and Cooper, J. and Cordelli, M. and Coupal, and CDF Collaboration)},
abstractNote = {We present the results of a search for the top quark in 19.3 pb[sup [minus]1] of [ital [bar p]p] collisions at [radical][ital s] =1.8 TeV. The data were collected at the Fermilab Tevatron collider using the Collider Detector at Fermilab (CDF). The search includes standard model [ital t[bar t]] decays to final states [ital ee][nu][bar [nu]], [ital e][mu][nu][bar [nu]], and [mu][mu][nu][bar [nu]] as well as [ital e]+[nu]+jets or [mu]+[nu]+jets. In the ([ital e],[mu])+[nu]+jets channel we search for [ital b] quarks from [ital t] decays via secondary vertex identification and via semileptonic decays of the [ital b] and cascade [ital c] quarks. In the dilepton final states we find two events with a background of 0.56[sub [minus]0.13][sup +0.25] events. In the [ital e],[mu]+[nu]+jets channel with a [ital b] identified via a secondary vertex, we find six events with a background of 2.3[plus minus]0.3. With a [ital b] identified via a semileptonic decay, we find seven events with a background of 3.1[plus minus]0.3. The secondary vertex and semileptonic-decay samples have three events in common. The probability that the observed yield is consistent with the background is estimated to be 0.26%. The statistics are too limited to firmly establish the existence of the top quark; however, a natural interpretation of the excess is that it is due to [ital t[bar t]] production. We present several cross-checks. Some support this hypothesis; others do not. Under the assumption that the excess yield over background is due to [ital t[bar t]], constrained fitting on a subset of the events yields a mass of 174[plus minus]10[sub [minus]12][sup +13] GeV/[ital c][sup 2] for the top quark. The [ital t[bar t]] cross section, using this top quark mass to compute the acceptance, is measured to be 13.9[sub [minus]4.8][sup +6.1] pb.},
doi = {10.1103/PhysRevD.50.2966},
journal = {Physical Review, D (Particles Fields); (United States)},
issn = {0556-2821},
number = ,
volume = 50:5,
place = {United States},
year = {1994},
month = {9}
}