Measurements Related to the CKM Angle Beta/Phi1 from BABAR. PDF Download
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Languages : en
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We present measurements related to the CKM angle [beta] from BABAR based on 82 or [approx]115 fb[sup -1] data samples collected at the PEP-II e[sup +]e[sup -] asymmetric B Factory collider. A new method allowing to measure the sign of cos2[beta] with B[sup 0] [yields] J/[psi] ''K*[sup 0]'' events is explained and related results reported. Recent CP measurements in the penguin dominated modes B[sup 0] [yields] [phi]K[sup 0], B[sup 0] [yields] K[sup +] K[sup -] K[sub S][sup 0], B[sup 0] [yields] [pi][sup 0] K[sub S][sup 0] and B[sup 0] [yields] f[sub 0] (980)K[sub S][sup 0] are presented.
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Languages : en
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We present measurements related to the CKM angle [beta] from BABAR based on 82 or [approx]115 fb[sup -1] data samples collected at the PEP-II e[sup +]e[sup -] asymmetric B Factory collider. A new method allowing to measure the sign of cos2[beta] with B[sup 0] [yields] J/[psi] ''K*[sup 0]'' events is explained and related results reported. Recent CP measurements in the penguin dominated modes B[sup 0] [yields] [phi]K[sup 0], B[sup 0] [yields] K[sup +] K[sup -] K[sub S][sup 0], B[sup 0] [yields] [pi][sup 0] K[sub S][sup 0] and B[sup 0] [yields] f[sub 0] (980)K[sub S][sup 0] are presented.
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Languages : en
Pages : 6
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We present recent results of hadronic B meson decays related to the CKM angle beta. The data used were collected by the BABAR detector at the PEP-II asymmetric-energy ee− collider operating at the Upsilon(4S) resonance located at the Stanford Linear Accelerator Center.
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Languages : en
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The primary objective of the BABAR Experiment is to test the Standard Model explanation of CP violation in weak decays by over-constraining the CKM Unitarity Triangle. This includes the measurement of all three angles of the triangle. Although precise measurements of the angle [beta] have been obtained using B decays to charmonium states, the remaining angles, [alpha] and [gamma], pose greater experimental challenges. In this paper, the latest measurements of modes which will constrain [alpha] and [gamma] will be presented, including B[sup 0] --> [rho][sup +][rho][sup -] for [alpha] and a measurement of sin(2[beta] + [gamma]) from the B[sup 0] --> D(*)[sup [+-]][pi][sup [-+]] system.
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Languages : en
Pages : 6
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We report measurements of the CKM angles?/?1 and?/?2 done by the BABAR and Belle experiments. Both experiments have collected large data samples, corresponding to a total of more than 1 billion of B{bar B} pairs, at the ee− asymmetric-energy colliders PEP-II (SLAC) and KEK-B (KEK), respectively.
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Languages : en
Pages : 4
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The primary goal of the BaBar and Belle experiments is to overconstrain the CKM Unitarity Triangle. Measurements of the angles of this triangle, known as [beta], [alpha], and [gamma] (or [phi]1, [phi]2, and [phi]3) give insight into the Standard Model description of CP violation in the quark sector. BaBar and Belle have recorded almost 1 ab−1 combined, and have measured [beta] to high precision. Measurements of [alpha] and [gamma] are less precise at present, but both experiments are rapidly accumulating data and developing new analysis techniques, and measurements of these angles will continue to provide useful constraints on the Standard Model description of CP violation in the years to come.
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Languages : en
Pages : 504
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Author: Rainer Bartoldus
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Languages : en
Pages : 12
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In this article I report on new and updated measurements of the CP-violating parameter {beta}({phi}{sub 1}), which is related to the phase of the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing matrix of the electroweak interaction. Over the past few years, {beta} has become the most precisely known parameter of the CKM unitarity triangle that governs the B system. The results presented here were produced by the two B Factories, BABAR and Belle, based on their most recent datasets of over 600 million B{bar B} events combined. The new world average for sin2{beta}, measured in the theoretically and experimentally cleanest charmonium modes, such as B{sup 0} {yields} J/{Psi}K{sub S}{sup 0}, is sin 2{beta} = 0.685 {+-} 0.032. In addition to these tree-level dominated decays, independent measurements of sin2{beta} are obtained from gluonic b {yields} s penguin decays, including B{sup 0} {yields} {phi}K{sub S}{sup 0}, B{sup 0} {yields} {eta}'K{sub S}{sup 0} and others. There are hints, albeit somewhat weaker than earlier this year, that these measurements tend to come out low compared to the charmonium average, giving rise to the tantalizing possibility that New Physics amplitudes could be contributing to the corresponding loop diagrams. Clearly, more data from both experiments are needed to elucidate these intriguing differences.
Author: Attila Mihalyi
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Languages : en
Pages : 198
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Author: Alfio Lazzaro
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Languages : en
Pages : 6
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We report on preliminary measurements of time-dependent CP-violation asymmetries in charmless neutral B meson decays to K{sup +}K{sup -}K{sup 0} including resonant decays {phi}K{sup 0} and f{sub 0}(980)K{sup 0}, {eta}{prime}K{sup 0}, {pi}{sup 0}K{sub S}{sup 0}, K{sub S}{sup 0}K{sub S}{sup 0}K{sub S}{sup 0}, K{sub S}{sup 0}K{sub S}{sup 0}, {rho}{sup 0}K{sub S}{sup 0}, {omega}{sub S}{sup 0}. The results are obtained from a data sample of up to 347 million B{bar B} pairs produced by e{sup +}e{sup -} annihilation at the {Upsilon}(4S) resonance collected with the BABAR detector at the PEP-II asymmetric-energy B-meson Factory at SLAC.
Author: C. Yeche
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Languages : en
Pages : 4
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We present BABAR experiment studies to measure the CKM angle {alpha} of the Unitarity Triangle. The measurements are based on the B meson decays into the two-body state ({pi}{pi}), the quasi two-body state ({rho}{rho}), and the three-body state ({pi}{sup +}{pi}{sup -}{pi}{sup 0}). The results are obtained from data samples of about 230 million {Upsilon}(4S) {yields} B{bar B} decays collected between 1999 and 2004 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC.
