We present a measurement of the direct CP violating asymmetry in the decay B-0-->K(+)pi(-) using a data sample of 227x10(6) Y(4S)-->B (B) over bar decays ollected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC. We observe a total signal yield of n(K)(-)pi(+)+n(K)(+)pi(-)=1606+/-51 decays and measure the asymmetry (n(K)(-)pi(+)-n(K)(+)pi(-))/(n(K)(-)pi(+)+n(K)(+)pi(-))=-0.133+/-0.030(stat)+/-0.009(syst). The probability of observing such an asymmetry in the absence of direct CP violation is 1.3x10(-5), corresponding to 4.2 standard deviations.

Direct CP violating asymmetry in B-0 -> K+pi(-) decays

ANDREOTTI, Mirco;AZZOLINI, Virginia;CALABRESE, Roberto;CIBINETTO, Gianluigi;LUPPI, Eleonora;NEGRINI, Matteo;SARTI, Alessio;
2004

Abstract

We present a measurement of the direct CP violating asymmetry in the decay B-0-->K(+)pi(-) using a data sample of 227x10(6) Y(4S)-->B (B) over bar decays ollected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC. We observe a total signal yield of n(K)(-)pi(+)+n(K)(+)pi(-)=1606+/-51 decays and measure the asymmetry (n(K)(-)pi(+)-n(K)(+)pi(-))/(n(K)(-)pi(+)+n(K)(+)pi(-))=-0.133+/-0.030(stat)+/-0.009(syst). The probability of observing such an asymmetry in the absence of direct CP violation is 1.3x10(-5), corresponding to 4.2 standard deviations.
2004
Aubert, B; Barate, R; Boutigny, D; Couderc, F; Gaillard, Jm; Hicheur, A; Karyotakis, Y; Lees, Jp; Tisserand, V; Zghiche, A; Palano, A; Pompili, A; Che...espandi
File in questo prodotto:
File Dimensione Formato  
PhysRevLett.93.131801.pdf

solo gestori archivio

Descrizione: Full text editoriale
Tipologia: Full text (versione editoriale)
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 774.02 kB
Formato Adobe PDF
774.02 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
0407057.pdf

accesso aperto

Descrizione: Pre-print
Tipologia: Pre-print
Licenza: Creative commons
Dimensione 1.53 MB
Formato Adobe PDF
1.53 MB Adobe PDF Visualizza/Apri

I documenti in SFERA 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/11392/1211504
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 130
  • ???jsp.display-item.citation.isi??? 348
social impact