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Measurement of the forward-backward asymmetry in low-mass bottom-quark pairs produced in proton-antiproton collisions

  • 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;
  • Erbacher, R;
  • Errede, S;
  • Esham, B
  • et al.
Abstract

We report a measurement of the forward-backward asymmetry, AFB, in bb pairs produced in proton-antiproton collisions and identified by muons from semileptonic b-hadron decays. The event sample is collected at a center-of-mass energy of s=1.96 TeV with the CDF II detector and corresponds to 6.9 fb-1 of integrated luminosity. We obtain an integrated asymmetry of AFB(bb)=(1.2±0.7)% at the particle level for b-quark pairs with invariant mass, mbb, down to 40 GeV/c2 and measure the dependence of AFB(bb) on mbb. The results are compatible with expectations from the standard model.

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