The data set collected with the ALEPH detector from 1991 to 1995 at LEP has been analysed to measure the charm forward-backward asymmetry at the Z. Out of a total of 4.1 million hadronic Z decays, about 36000 high momentum D(*+) D(+) and D(0) decays were reconstructed, of which 80% originate from Z --> <c(c)over bar> events. The forward-backward asymmetry was measured at three energy points: A(FB)(c)(root s = 89.37 GeV) = (-1.0 +/- 4.4)% A(FB)(c)(root s = 91.22 GeV) = (6.3 +/- 1.0)% A(FB)(c)(root s = 92.96 GeV) = (11.0 +/- 3.4)%. From this analysis, a value of the effective electroweak mixing angle sin(2)theta(W)(eff) = 0.2321 +/- 0.0016 is extracted. (C) 1998 Elsevier Science B.V. All rights reserved.

The forward-backward asymmetry for charm quarks at the Z

ROLANDI, LUIGI;LIGABUE, FRANCO;LUSIANI, Alberto;
1998

Abstract

The data set collected with the ALEPH detector from 1991 to 1995 at LEP has been analysed to measure the charm forward-backward asymmetry at the Z. Out of a total of 4.1 million hadronic Z decays, about 36000 high momentum D(*+) D(+) and D(0) decays were reconstructed, of which 80% originate from Z --> events. The forward-backward asymmetry was measured at three energy points: A(FB)(c)(root s = 89.37 GeV) = (-1.0 +/- 4.4)% A(FB)(c)(root s = 91.22 GeV) = (6.3 +/- 1.0)% A(FB)(c)(root s = 92.96 GeV) = (11.0 +/- 3.4)%. From this analysis, a value of the effective electroweak mixing angle sin(2)theta(W)(eff) = 0.2321 +/- 0.0016 is extracted. (C) 1998 Elsevier Science B.V. All rights reserved.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

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: http://hdl.handle.net/11384/5417
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 13
social impact