We report measurements of sin 2 beta and cos 2 beta using a time-dependent Dalitz plot analysis of B-0 -> D((*))h(0) with D -> K-S(0)pi(+)pi(-) decays, where the light unflavored and neutral hadron h(0) is a pi(0),eta, or omega meson. The analysis uses a combination of the final data sets of the BABAR and Belle experiments containing 471 x 10(6) and 772 x 10(6) B (B) over bar pairs collected at the gamma(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure sin 2 beta = 0.80 +/- 0.14(stat) +/- 0.06(syst) +/- 0.03(model) and cos 2 beta = 0.91 +/- 0.22(stat) +/- 0.09(syst) +/- 0.07(model). The result for the direct measurement of the angle is beta = (22.5 +/- 4.4(stat) +/- 1.2(syst) +/- 0.6(model))degrees. The last quoted uncertainties are due to the composition of the D-0 -> K-S(0)pi(+)pi(-) decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics e(+) e(-) -> c (c) over bar data sample as part of this analysis. We find the first evidence for cos 2 beta > 0 at the level of 3.7 standard deviations. The measurement excludes the trigonometric multifold solution pi/2 - beta = (68.1 +/- 0.7)degrees at the level of 7.3 standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of beta = 0 degrees is ruled out at the level of 5.1 standard deviations, and thus CP violation is observed in B-0 -> D-(*) h(0) decays. The measurement assumes no direct CP violation in B-0 -> D-(*) h(0) decays.

Measurement of cos2β in B0→D(*)h0 with D→KS0π+π− decays by a combined time-dependent Dalitz plot analysis of BaBar and Belle data

Batignani, G.;Bettarini, S.;Casarosa, G.;Cenci, R.;Forti, F.;Giorgi, M.  A.;Lueck, T.;Oberhof, B.;Paoloni, E.;Rizzo, G.;Tenchini, F.;Zani, L.;
2018-01-01

Abstract

We report measurements of sin 2 beta and cos 2 beta using a time-dependent Dalitz plot analysis of B-0 -> D((*))h(0) with D -> K-S(0)pi(+)pi(-) decays, where the light unflavored and neutral hadron h(0) is a pi(0),eta, or omega meson. The analysis uses a combination of the final data sets of the BABAR and Belle experiments containing 471 x 10(6) and 772 x 10(6) B (B) over bar pairs collected at the gamma(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure sin 2 beta = 0.80 +/- 0.14(stat) +/- 0.06(syst) +/- 0.03(model) and cos 2 beta = 0.91 +/- 0.22(stat) +/- 0.09(syst) +/- 0.07(model). The result for the direct measurement of the angle is beta = (22.5 +/- 4.4(stat) +/- 1.2(syst) +/- 0.6(model))degrees. The last quoted uncertainties are due to the composition of the D-0 -> K-S(0)pi(+)pi(-) decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics e(+) e(-) -> c (c) over bar data sample as part of this analysis. We find the first evidence for cos 2 beta > 0 at the level of 3.7 standard deviations. The measurement excludes the trigonometric multifold solution pi/2 - beta = (68.1 +/- 0.7)degrees at the level of 7.3 standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of beta = 0 degrees is ruled out at the level of 5.1 standard deviations, and thus CP violation is observed in B-0 -> D-(*) h(0) decays. The measurement assumes no direct CP violation in B-0 -> D-(*) h(0) decays.
2018
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Rama, M.; Randle-Conde, A.; Ratcliff, B.  N.; Raven, G.; Resmi, P.  K.; Ritchie, J.  L.; Ritter, M.; Rizzo, G.; Roberts, D.  A.; Robertson, S.  H.; Röhrken, M.; Roney, J.  M.; Roodman, A.; Rossi, A.; Rotondo, M.; Rozanska, M.; Russo, G.; Sacco, R.; Al Said, S.; Sakai, Y.; Sandilya, S.; Santelj, L.; Santoro, V.; Sanuki, T.; Savinov, V.; Schneider, O.; Schnell, G.; Schroeder, T.; Schubert, K.  R.; Schwanda, C.; Schwartz, A.  J.; Schwitters, R.  F.; Sciacca, C.; Seddon, R.  M.; Seino, Y.; Sekula, S.  J.; Senyo, K.; Seon, O.; Serednyakov, S.  I.; Sevior, M.  E.; Shebalin, V.; Shibata, T. -A.; Shimizu, N.; Shiu, J. -G.; Simi, G.; Simon, F.; Simonetto, F.; Skovpen, Yu.  I.; Smith, J.  G.; Smith, A.  J.  S.; So, R.  Y.; Sobie, R.  J.; Soffer, A.; Sokoloff, M.  D.; Solodov, E.  P.; Solovieva, E.; Spanier, S.  M.; Starič, M.; Stroili, R.; Sullivan, M.  K.; Sumisawa, K.; Sumiyoshi, T.; Summers, D.  J.; Sun, L.; Takizawa, M.; Tamponi, U.; Tanida, K.; Taras, P.; Tasneem, N.; Tenchini, F.; Tisserand, V.; 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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/942492
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