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EnglishWe report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle gamma through a Dalitz plot analysis of neutral D-meson decays to K(S)(0)pi(+) pi(-) and K(S)(0) K(+) K(-) produced in the processes B(-/+) -> DK(-/+), B(-/+) -> D* K(-/+) with D* -> D pi(0), D gamma and B -/+ DK*-/+ with K*(-/+) -> K(S)(0)pi(-/+), using 468 million B (B) over bar pairs collected by the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC. We measure gamma = (68 +/- 14 +/- 4 +/- 3)degrees (modulo 180 degrees), where the first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the uncertainty in the description of the neutral D decay amplitudes. This result is inconsistent with gamma = 0 ( no direct CP violation) with a significance of 3.5 standard deviations.
http://hdl.handle.net/11384/4452| Titolo: | Evidence for Direct CP Violation in the Measurement of the Cabbibo-Kobayashi-Maskawa Angle gamma with B(-/+) -> D(()*())K(()*()-/+) Decays RID C-5223-2009 |
| Autori interni: | LUSIANI, Alberto |
| Data di pubblicazione: | 2010 |
| Rivista: | PHYSICAL REVIEW LETTERS |
| Abstract: | We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle gamma through a Dalitz plot analysis of neutral D-meson decays to K(S)(0)pi(+) pi(-) and K(S)(0) K(+) K(-) produced in the processes B(-/+) -> DK(-/+), B(-/+) -> D* K(-/+) with D* -> D pi(0), D gamma and B -/+ DK*-/+ with K*(-/+) -> K(S)(0)pi(-/+), using 468 million B (B) over bar pairs collected by the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC. We measure gamma = (68 +/- 14 +/- 4 +/- 3)degrees (modulo 180 degrees), where the first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the uncertainty in the description of the neutral D decay amplitudes. This result is inconsistent with gamma = 0 ( no direct CP violation) with a significance of 3.5 standard deviations. |
| Handle: | http://hdl.handle.net/11384/4452 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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