اشترك بالحزمة الذهبية واحصل على وصول غير محدود شمرا أكاديميا
تسجيل مستخدم جديدMeasurements of Phi_1 and Phi_2 by Belle and Babar
98
0
0.0
(
0
)
تأليف
T.Aushev
اسأل ChatGPT حول البحث
ﻻ يوجد ملخص باللغة العربية
We report recent measurements of the Unitarity triangle angles phi_1 and phi_2 using large data samples collected with Belle and BaBar detectors at e+e- asymmetric-energy colliders.
قيم البحث
اقرأ أيضاً
Evidence from the babar, Belle and CDF experiments for the phenomenon of dzdzb oscillations is reviewed. A summary is made of the current understanding of the parameters defining the mixing of mass eigenstates that give rise to the oscillations. Resu
lts of searches for CP violation induced by mixing, are given, and estimates for the precision of measurements that can be expected in future experiments are made.
We present preliminary measurements of CP-violating asymmetries in B decays. These include new results on the CKM angle alpha based on studies of the decay B -> rho+ rho- and several charmonium and hadronic penguin modes, sensitive to the CKM angle b
eta, including results on B -> phi K0S, B -> K+K-K0, B -> eta K0S, B -> f0 K0, and B -> pi0 K0S. We also report on several of results related to the extraction of gamma and (2*beta+gamma) and present limits on CPT violation in B decays.
We report a measurement of the time-dependent CP asymmetry of B0->D(*)CP h0 decays, where the light neutral hadron h0 is a pi0, eta or omega meson, and the neutral D meson is reconstructed in the CP eigenstates K+ K-, K0S pi0 or K0S omega. The measur
ement is performed combining the final data samples collected at the Y(4S) resonance by the BaBar and Belle experiments at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain ( 471 +/- 3 ) x 10^6 BB pairs recorded by the BaBar detector and ( 772 +/- 11 ) x 10^6, BB pairs recorded by the Belle detector. We measure the CP asymmetry parameters -eta_f S = +0.66 +/- 0.10 (stat.) +/- 0.06 (syst.) and C = -0.02 +/- 0.07 (stat.) +/- 0.03 (syst.). These results correspond to the first observation of CP violation in B0->D(*)CP h0 decays. The hypothesis of no mixing-induced CP violation is excluded in these decays at the level of 5.4 standard deviations.
We present the recent measurements of the B0 -> eta K0 and the B -> omega K decay modes based on the full data set of 772x10^6 BBbar pairs collected by the Belle detector at the KEKB e+e- collider. In the B0 -> eta K^{0} mode, we obtain the CP-violat
ing parameters A(etaK0) = +0.03+/-0.05(stat)+/-0.04(syst), S(etaK0) = +0.68+/-0.07(stat)+/-0.03(syst). This is the worlds most precise result on the eta K0 CP parameters. In B -> omega K decays, we measure the branching fractions B(B0 -> omega K0) = (4.5+/-0.4(stat)+/-0.3(syst))x10^-6, B(B- -> omega K-) = (6.8+/-0.4(stat)+/-0.4(syst))x10^-6, which are their current most precise results. We measure the first evidence of CP violation in the B0 -> omega K0S decay mode, obtaining the CP-violating parameters A(omega K0S} = -0.36+/-0.19(stat)+/-0.05(syst), S(omega K0S} = +0.91+/-0.32(stat)+/-0.05(syst). In the B- -> omega K- mode, we measure the direct CP-violation parameter A(omega K-) = -0.03+/-0.04(stat)+/-0.01(syst), which is its most precise measurement to date.
A combined fit is performed to the BaBar and Belle measurements of the e+e- to pi+pi-psi(2S) cross sections for center-of-mass energy between threshold and 5.5 GeV. The resonant parameters of the Y(4360) and Y(4660) are determined. The mass is 4355^{
+9}_{-10}pm 9 MeV/c^2 and the width is 103^{+17}_{-15}pm 11 MeV/c^2 for the Y(4360), and the mass is 4661^{+9}_{-8}pm 6 MeV/c^2 and the width is 42^{+17}_{-12}pm 6 MeV/c^2 for the Y(4660). The production of the Y(4260) in pi+pi-psi(2S) mode is found to be at 2sigma level, and B(Y(4260) to pi+pi-psi(2S))Gamma_{e+e-} is found to be less than 4.3 eV/c^2 at the 90% confidence level, or equal to 7.4^{+2.1}_{-1.7} eV/c^2 depending on it interferes with the Y(4360) constructively or destructively. These information will shed light on the understanding of the nature of the Y states observed in initial state radiation processes.
سجل دخول لتتمكن من نشر تعليقات
التعليقات
جاري جلب التعليقات
سجل دخول لتتمكن من متابعة معايير البحث التي قمت باختيارها
