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Search for standard-model Z and Higgs bosons decaying into a bottom-antibottom quark pair in proton-antiproton collisions at 1.96 TeV SEARCH for STANDARD-MODEL Z and HIGGS ... T. AALTONEN et al.

  • Author(s): Aaltonen, T;
  • Amerio, S;
  • Amidei, D;
  • Anastassov, A;
  • Annovi, A;
  • Antos, J;
  • Apollinari, G;
  • Appel, JA;
  • Arisawa, T;
  • Artikov, A;
  • Asaadi, J;
  • Ashmanskas, W;
  • Auerbach, B;
  • Aurisano, A;
  • Azfar, F;
  • Badgett, W;
  • Bae, T;
  • Barbaro-Galtieri, A;
  • Barnes, VE;
  • Barnett, BA;
  • Barria, P;
  • Bartos, P;
  • Bauce, M;
  • Bedeschi, F;
  • Behari, S;
  • Bellettini, G;
  • Bellinger, J;
  • Benjamin, D;
  • Beretvas, A;
  • Bhatti, A;
  • Bland, KR;
  • Blumenfeld, B;
  • Bocci, A;
  • Bodek, A;
  • Bortoletto, D;
  • Boudreau, J;
  • Boveia, A;
  • Brigliadori, L;
  • Bromberg, C;
  • Brucken, E;
  • Budagov, J;
  • Budd, HS;
  • Burkett, K;
  • Busetto, G;
  • Bussey, P;
  • Butti, P;
  • Buzatu, A;
  • Calamba, A;
  • Camarda, S;
  • Campanelli, M;
  • Canelli, F;
  • Carls, B;
  • Carlsmith, D;
  • Carosi, R;
  • Carrillo, S;
  • Casal, B;
  • Casarsa, M;
  • Castro, A;
  • Catastini, P;
  • Cauz, D;
  • Cavaliere, V;
  • Cerri, A;
  • Cerrito, L;
  • Chen, YC;
  • Chertok, M;
  • Chiarelli, G;
  • Chlachidze, G;
  • Cho, K;
  • Chokheli, D;
  • Clark, A;
  • Clarke, C;
  • Convery, ME;
  • Conway, J;
  • Corbo, M;
  • Cordelli, M;
  • Cox, CA;
  • Cox, DJ;
  • Cremonesi, M;
  • Cruz, D;
  • Cuevas, J;
  • Culbertson, R;
  • D'Ascenzo, N;
  • Datta, M;
  • De Barbaro, P;
  • Demortier, L;
  • Deninno, M;
  • D'Errico, M;
  • Devoto, F;
  • Di Canto, A;
  • Di Ruzza, B;
  • Dittmann, JR;
  • Donati, S;
  • D'Onofrio, M;
  • Dorigo, M;
  • Driutti, A;
  • Ebina, K;
  • Edgar, R;
  • Elagin, A;
  • Erbacher, R;
  • Errede, S
  • et al.

Published Web Location

http://10.0.4.79/physrevd.98.072002
No data is associated with this publication.
Abstract

The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (pp̄) collisions with a vertex displaced from the pp̄ interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4 fb-1, is used to measure the Z-boson production cross section times branching ratio into bb̄. The number of Z→bb̄ events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, σ(pp̄→Z)×B(Z→bb̄)=1.11±0.08(stat)±0.14(syst) nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive pp̄→H→bb̄ process at s=1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or σ=40.6 pb, at the 95% confidence level.

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