CRIS Current Research Information System

We report measurements of the polarization of W bosons from top-quark decays using 2.7 fb-1 of p anti-p collisions collected by the CDF II detector. Assuming a top-quark mass of 175 GeV/c2, three measurements are performed. A simultaneous measurement of the fraction of longitudinal (f_0) and right-handed (f_+) W bosons yields the model-independent results f_0 0.88 +/- 0.11(stat) +/- 0.06(syst) and f_+ = -0.15 +/- 0.07(stat) +/- 0.06(syst) with a correlation coefficient of -0.59. A measurement of f_0 (f_+) constraining f_+ (f_0) to its standard model value of 0.0 (0.7) yields f_0 = 0.70 +/- 0.07(stat) +/- 0.04(syst) (f_+ = -0.01 +/- 0.02(stat) +/- 0.05(syst)). All these results are consistent with standard model expectations.

T. AALTONEN, B.ALVAREZ GONZALEZV, S. AMERIO, D. AMIDEI, A. ANASTASSOV, A. ANNOVI, et al. (2010). Measurement of W-Boson Polarization in Top-quark Decay in p anti-p Collisions at s**(1/2) =11.96 TeV. PHYSICAL REVIEW LETTERS, 105, 042002-1-042002-8 [10.1103/PhysRevLett.105.042002].

Measurement of W-Boson Polarization in Top-quark Decay in p anti-p Collisions at s**(1/2) =11.96 TeV

CASTRO, ANDREA;DENINNO, MARIA MADDALENA;MARGAROLI, FABRIZIO;MAZZANTI, PAOLO;MOGGI, NICCOLO';MUSSINI, MANUEL;RIMONDI, FRANCO;ZUCCHELLI, STEFANO
2010

Abstract

We report measurements of the polarization of W bosons from top-quark decays using 2.7 fb-1 of p anti-p collisions collected by the CDF II detector. Assuming a top-quark mass of 175 GeV/c2, three measurements are performed. A simultaneous measurement of the fraction of longitudinal (f_0) and right-handed (f_+) W bosons yields the model-independent results f_0 0.88 +/- 0.11(stat) +/- 0.06(syst) and f_+ = -0.15 +/- 0.07(stat) +/- 0.06(syst) with a correlation coefficient of -0.59. A measurement of f_0 (f_+) constraining f_+ (f_0) to its standard model value of 0.0 (0.7) yields f_0 = 0.70 +/- 0.07(stat) +/- 0.04(syst) (f_+ = -0.01 +/- 0.02(stat) +/- 0.05(syst)). All these results are consistent with standard model expectations.
2010
T. AALTONEN, B.ALVAREZ GONZALEZV, S. AMERIO, D. AMIDEI, A. ANASTASSOV, A. ANNOVI, et al. (2010). Measurement of W-Boson Polarization in Top-quark Decay in p anti-p Collisions at s**(1/2) =11.96 TeV. PHYSICAL REVIEW LETTERS, 105, 042002-1-042002-8 [10.1103/PhysRevLett.105.042002].
T. AALTONEN; B.ALVAREZ GONZALEZV; S. AMERIO; D. AMIDEI; A. ANASTASSOV; A. ANNOVI; J. ANTOS; G. APOLLINARI; J.A. APPEL; A. APRESYAN; T. ARISAWA; A. AR...espandi
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/98931
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 45
  • ???jsp.display-item.citation.isi??? 30
social impact