We present a new measurement of the time-dependent CP asymmetry of B0→D*+D*− decays using (471±5) million BB⎯⎯⎯ pairs collected with the BABAR detector at the PEP-II B Factory at the SLAC National Accelerator Laboratory. Using the technique of partial reconstruction, we measure the time-dependent CP asymmetry parameters S=−0.34±0.12±0.05 and C=+0.15±0.09±0.04. Using the value for the CP-odd fraction R⊥=0.158±0.028±0.006, previously measured by BABAR with fully reconstructed B0→D*+D*− events, we extract the CP-even components S+=−0.49±0.18±0.07±0.04 and C+=+0.15±0.09±0.04. In each case, the first uncertainty is statistical and the second is systematic; the third uncertainty on S+ is the contribution from the uncertainty on R⊥. The measured value of the CP-even component S+ is consistent with the value of sin2β measured in b→(cc⎯⎯)s transitions, and with the Standard Model expectation of small penguin contributions.

Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Measurement of the time-dependent CP asymmetry of partially reconstructed B-0 -> D*D+*(-) decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(11), 1-15 [10.1103/PhysRevD.86.112006].

Measurement of the time-dependent CP asymmetry of partially reconstructed B-0 -> D*D+*(-) decays

PATRIGNANI, CLAUDIA;
2012

Abstract

We present a new measurement of the time-dependent CP asymmetry of B0→D*+D*− decays using (471±5) million BB⎯⎯⎯ pairs collected with the BABAR detector at the PEP-II B Factory at the SLAC National Accelerator Laboratory. Using the technique of partial reconstruction, we measure the time-dependent CP asymmetry parameters S=−0.34±0.12±0.05 and C=+0.15±0.09±0.04. Using the value for the CP-odd fraction R⊥=0.158±0.028±0.006, previously measured by BABAR with fully reconstructed B0→D*+D*− events, we extract the CP-even components S+=−0.49±0.18±0.07±0.04 and C+=+0.15±0.09±0.04. In each case, the first uncertainty is statistical and the second is systematic; the third uncertainty on S+ is the contribution from the uncertainty on R⊥. The measured value of the CP-even component S+ is consistent with the value of sin2β measured in b→(cc⎯⎯)s transitions, and with the Standard Model expectation of small penguin contributions.
2012
Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Measurement of the time-dependent CP asymmetry of partially reconstructed B-0 -> D*D+*(-) decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(11), 1-15 [10.1103/PhysRevD.86.112006].
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G....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/11585/537499
 Attenzione

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

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 11
  • ???jsp.display-item.citation.isi??? 7
social impact