Measurement of the CKM Angles Gamma And 2 Beta + Gamma at B Factories PDF Download
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Author: Jean-Pierre Lees
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Languages : en
Pages : 10
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Book Description
On behalf of the BABAR and Belle collaborations, the authors report on the measurement of the angle {gamma} and of the sum of angles 2{beta} + {gamma} of the Unitarity Triangle.
Author: Jean-Pierre Lees
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Book Description
On behalf of the BABAR and Belle collaborations, the authors report on the measurement of the angle {gamma} and of the sum of angles 2{beta} + {gamma} of the Unitarity Triangle.
Author:
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Languages : en
Pages :
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Book Description
The methods to measure the angle[gamma] of the CKM unitarity triangle at the B factories are presented. Special emphasis is given to the measurement of sin(2[beta] + [gamma]) using the B° → D*{sup {+-}} [pi]{sup {-+}} decays which has already produced results providing an interesting constraint in the [rho] - [eta] plane. Various methods using B → DK decays are also presented.
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Category :
Languages : en
Pages : 11
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Book Description
We present a review on the measurements of the CKM angle [gamma] ([phi]3)1 as performed by the BABAR and Belle experiments at the asymmetric-energy ee− B factories colliders PEP-II and KEKB. These measurements are using either charged or neutral B decays. For charged B decays the modes {tilde D}°K−, {tilde D}*°K−, and {tilde D}°K*− are employed, where {tilde D}° indicates either a D° or a {bar D}° meson. Direct CP violation is exploited. It is caused by interferences between V{sub ub} and V{sub cb} accessible transitions that generate asymmetries in the final states. For these decays various methods exist to enhance the sensitivity to the V{sub ub} transition, carrying the weak phase [gamma]. For neutral B decays, the modes D{sup (*){+-}}[pi]{sup {-+}} and D{sup {+-}}[rho]{sup {-+}} are used. In addition to the V{sub ub} and V{sub cb} interferences, these modes are sensitive to the B°-{bar B}° mixing, so that time dependent analyses are performed to extract sin(2[beta] + [gamma]). An alternative method would use the lower branching ratios decay modes {tilde D}{sup (*)0}{bar K}{sup (*)0} where much larger asymmetries are expected. The various available methods are mostly ''theoretically clean'' and always free of penguins diagrams. In some cases a high sensitivity to [gamma] is expected and large asymmetries may be seen. But these measurements are always experimentally difficult as one has to face with either low branching ratios, or small asymmetries, or additional technical/theoretical difficulties due to Dalitz/SU(3) and re-scattering models needed to treat/estimate nuisance parameters such as unknown strong phases and the relative magnitude of the amplitude of the interfering ''V{sub ub}'' transitions. Thus at the present time only a relatively limited precision on [gamma] can be extracted from these measurements. The current world average is [gamma] = (7826{sup +19}){sup o} [1]. For other methods and long term perspectives, as discussed in details, the reader is invited to consult the proceedings of the recent CKM workshop that was held in Nagoya (Japan) in December 2006 [2].
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Category :
Languages : en
Pages :
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Book Description
We report on the initial measurements of the angle [gamma] and the sum of angles 2[beta] +[gamma] of the Unitarity Triangle. When compared with indirect information on the value of [gamma] from other measurements of CKM parameters, the measurement of these angles will provide a precise test of Standard Model predictions, as statistics increase. There are several methods for directly measuring [gamma] and 2[beta] +[gamma]. We report on the status of each of these techniques, and the resulting constraints on the values of these angles.
Author:
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Category :
Languages : en
Pages : 8
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Author:
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Category :
Languages : en
Pages : 4
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Book Description
We present a short review of the measurements of the CKM angle [gamma] performed by the BABAR experiment. We focus on methods using charged B decays, which give a direct access to [gamma] and provide the best constraints so far.
![Measurement of the CKM Angle Gammma With B-+ ---]D(*)[K0(S) Pi- Pi+]K(*)-+ Decays in BaBar PDF](https://books.google.com/books/content/images/frontcover/b3PdwQEACAAJ?fife=w80-h100)
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Languages : en
Pages : 5
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We report on the measurement of the Cabibbo-Kobayashi-Maskawa angle? through a Dalitz analysis of neutral D decays to K-short?−? in the processes B{sup {minus_plus}} → D(*)K{sup {minus_plus}} and B{sup {minus_plus}} → DK*{sup {minus_plus}}, D* → D?°, D?, with the BaBar detector at the SLAC PEP-II e+e− asymmetric-energy collider.
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Category :
Languages : en
Pages : 22
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We report on an improved measurement of the Cabibbo-Kobayashi-Maskawa CP-violating phase? through a Dalitz plot analysis of neutral D meson decays to K{sub s}°??− and K{sub s}°K+K− produced in the processes B{sup {-+}} → DK{sup {-+}}, B{sup {-+}} → D* K{sup {-+}} with D* → D?°, D?, and B{sup {-+}} → DK*{sup {-+}} with K8{sup {-+}} → K{sub S}°?{sup {-+}}. Using a sample of 383 million B{bar B} pairs collected by the BABAR detector, we measure? = (76 ± 22 ± 5± 5){sup o} (mod 180{sup o}), where the first error is statistical, the second is the experimental systematic uncertainty and the third reflects the uncertainty on the description of the Dalitz plot distributions. The corresponding two standard deviation region is 29{sup o}
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Languages : en
Pages : 8
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Book Description
The authors present a measurement of the angle? of the Unitarity Triangle with a Dalitz analysis of neutral D decays to K{sub S}??− from the processes B° → {bar D}°(D°)K*° ({bar B}° → D°({bar D}°){bar K}*°) with K*° → K+?− ({bar K}*° → K−?+). Using a sample of 371 x 106 B{bar B} pairs collected with the BABAR detector at PEP II, they measure the angle? as a function of r{sub S}, the magnitude of the average ratio between b → u and b → c amplitudes. Combining this result with the available information on r{sub S}, they obtain? = (162 ± 56){sup o} or (342 ± 56){sup o} and r{sub S}
Author: V. Tisserand
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Category :
Languages : en
Pages : 4
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Book Description
The authors present the results of the measurements employed by the BABAR Collaboration, to determine the value of the Cabibbo-Kobayashi-Maskawa (CKM) CP-violating phase {gamma} ({triple_bond} arg [-V{sub ud}V*{sub ub}/V{sub cd}V*{sub cb}]). These measurements are based on the studies performed with the charged B-decays B{sup -} {yields} {tilde D}{sup 0} K{sup -}, B{sup -} {yields} {tilde D}*{sup 0} K*{sup -}, where {tilde D}{sup 0} indicates either a D{sup 0} or a {bar D}{sup 0} meson. A sample of about 230 million B{bar B} pairs collected by the BABAR detector [1], at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC, is used.
