Publications [#307799] of Ashutosh V. Kotwal

Papers Published
  1. Aaltonen, T; Abazov, VM; Abbott, B; Acharya, BS; Adams, M; Adams, T; Alexeev, GD; Alkhazov, G; Alton, A; González, BA; Alverson, G; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Aoki, M; Apollinari, G; Appel, JA; Arisawa, T; Artikov, A; Asaadi, J; Ashmanskas, W; Askew, A; Asman, B; Atkins, S; Atramentov, O; Auerbach, B; Augsten, K; Aurisano, A; Avila, C; Azfar, F; Badaud, F; Badgett, W; Bae, T; Bagby, L; Baldin, B; Bandurin, DV; Banerjee, S; Barbaro-Galtieri, A; Barberis, E et al., Combination of CDF and D0 measurements of the W boson helicity in top quark decays, Physical Review D - Particles, Fields, Gravitation, and Cosmology, vol. 85 no. 7 (2012) [doi] .

    Abstract:
    We report the combination of recent measurements of the helicity of the W boson from top quark decay by the CDF and D0 collaborations, based on data samples corresponding to integrated luminosities of 2.7-5.4fb -1 of pp̄ collisions collected during Run II of the Fermilab Tevatron collider. Combining measurements that simultaneously determine the fractions of W bosons with longitudinal (f 0) and right-handed (f +) helicities, we find f 0=0.722±0.081[±0.062(stat)±0.052(syst)] and f +=-0.033±0.046[±0.034(stat)±0.031(syst)]. Combining measurements where one of the helicity fractions is fixed to the value expected in the standard model, we find f 0=0.682±0. 057[±0.035(stat)±0.046(syst)] for fixed f + and f +=-0.015±0.035[±0.018(stat)±0.030(syst)] for fixed f 0. The results are consistent with standard model expectations. © 2012 American Physical Society.