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Measurement of sin2θeffleptusing e+e- pairs from γ/Z bosons produced in pp collisions at a center-of-momentum energy of 1.96 TeV

  • 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
  • et al.

© 2016 American Physical Society. At the Fermilab Tevatron proton-antiproton (pp) collider, Drell-Yan lepton pairs are produced in the process pp→e+e-+X through an intermediate γ∗/Z boson. The forward-backward asymmetry in the polar-angle distribution of the e- as a function of the e+e - pair mass is used to obtain sin2θefflept, the effective leptonic determination of the electroweak-mixing parameter sin2θW. The measurement sample, recorded by the Collider Detector at Fermilab (CDF), corresponds to 9.4 fb-1 of integrated luminosity from pp collisions at a center-of-momentum energy of 1.96 TeV, and is the full CDF Run II data set. The value of sin2θefflept is found to be 0.23248±0.00053. The combination with the previous CDF measurement based on μ+μ- pairs yields sin2θefflept=0.23221±0.00046. This result, when interpreted within the specified context of the standard model assuming sin2θW=1-MW2/MZ2 and that the W- and Z-boson masses are on-shell, yields sin2θW=0.22400±0.00045, or equivalently a W-boson mass of 80.328±0.024 GeV/c2.

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