![Determination of the CKM Angle [gamma] [gamma] and Vub/Vcb from Inclusive Direct CP Asymmetries and Branching Ratios in Charmless B-decays PDF](https://books.google.com/books/content/images/frontcover/JThGuAAACAAJ?fife=w150-h200)
Author: Alexander LenzPublisher:
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Languages : en
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Determination of the CKM Angle [gamma] [gamma] and Vub/Vcb from Inclusive Direct CP Asymmetries and Branching Ratios in Charmless B-decays
![Determination of the CKM Angle [gamma] [gamma] and Vub/Vcb from Inclusive Direct CP Asymmetries and Branching Ratios in Charmless B-decays PDF](https://books.google.com/books/content/images/frontcover/JThGuAAACAAJ?fife=w80-h100)
Author: Alexander LenzDetermination of the CKM Angle Γ [gamma] and Vub/Vcb from Inclusive Direct CP Asymmetries and Branching Ratios in Charmless B-decays
![Determination of the CKM Angle Γ [gamma] and Vub/Vcb from Inclusive Direct CP Asymmetries and Branching Ratios in Charmless B-decays PDF](https://books.google.com/books/content/images/frontcover/jMvKzQEACAAJ?fife=w80-h100)
Author: Alexander LenzDetermination of the CKM Angle [gamma] and |Vub/Vcb| from Inclusive Direct CP Asymmetries and Branching Ratios in Charmless [Beta] Decays
![Determination of the CKM Angle [gamma] and |Vub/Vcb| from Inclusive Direct CP Asymmetries and Branching Ratios in Charmless [Beta] Decays PDF](https://books.google.com/books/content/images/frontcover/Cld3zQEACAAJ?fife=w80-h100)
Author: Determination of the CKM Angle G and Vub/Vcb from Inclusive Direct CP Asymmetries and Branching Ratios in Charmless B Decays
Author: Alexander LenzBranching ratio and direct CP-violating rate asymmetry of the rare decays B → K*γ [K gamma] and B → ργ [rhogamma]
![Branching ratio and direct CP-violating rate asymmetry of the rare decays B → K*γ [K gamma] and B → ργ [rhogamma] PDF](https://books.google.com/books/content/images/frontcover/1CPGzQEACAAJ?fife=w80-h100)
Author: Christoph GreubBranching ratio and direct CP-violating rate asymmetry of the rare decays B → K*[gamma] and B → [rho gamma]1
![Branching ratio and direct CP-violating rate asymmetry of the rare decays B → K*[gamma] and B → [rho gamma]1 PDF](https://books.google.com/books/content/images/frontcover/U32PzQEACAAJ?fife=w80-h100)
Author: Measurements of the CKM Angle Phi3/gamma
Author: Publisher:
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Languages : en
Pages : 11
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].
New Methods for Extracting the CKM Angle [gamma] Using B{sup {+-}} 2!D°K− ; {anti D}°K−
![New Methods for Extracting the CKM Angle [gamma] Using B{sup {+-}} 2!D°K− ; {anti D}°K− PDF](https://books.google.com/books/content/images/frontcover/sMuKAQAACAAJ?fife=w80-h100)
Author: Publisher:
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Languages : en
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Book Description
In this talk the author will discuss the extraction of the CKM angle [gamma] at B-factories through the interference of the subprocesses B− → K−D° and B− → K−{anti D}°. This seemingly impossible interference may be accomplished by allowing both D° and {anti D}° to decay to a common final state. If only CP eigenstate decay modes of the D are considered, the branching ratio for B− → {anti D}°K− must be experimentally determined in order to extract [gamma]. He describes why this determination is likely to be experimentally impossible. On the other hand, if more general D decays are considered, the angle [gamma] may then be determined. In fact, it is possible that a reasonable determination of [gamma] may be made with O(108) B's.
Measurement of the Direct CP Asymmetry in B --] S Gamma Decays
![Measurement of the Direct CP Asymmetry in B --] S Gamma Decays PDF](https://books.google.com/books/content/images/frontcover/xNSxDAEACAAJ?fife=w80-h100)
Author: Publisher:
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Languages : en
Pages :
Book Description
We describe a measurement of the direct CP asymmetry between inclusive b [yields] s[gamma] and [bar b] [yields] [bar s][gamma] decays. This asymmetry is expected to be less than 0.01 in the Standard Model, but could be enhanced up to about 0.10 by new physics contributions. We use a sample of 89 million B[bar B] pairs recorded with the BABAR detector at PEP-II, from which we reconstruct a set of 12 exclusive b [yields] s[gamma] final states containing one charged or neutral kaon and one to three pions. We measure an asymmetry of A[sub CP] (b [yields] s[gamma]) = 0.025 [+-] 0.050(stat.) [+-] 0.015(syst.), corresponding to an allowed range of -0.06
Measurement of Branching Fractions of B Decays to K1(1270)pi and K1(1400)pi and Determination of the CKM Angle Alpha from B0 --] A1(1260) - Pi-
![Measurement of Branching Fractions of B Decays to K1(1270)pi and K1(1400)pi and Determination of the CKM Angle Alpha from B0 --] A1(1260) - Pi- PDF](https://books.google.com/books/content/images/frontcover/za-rAQAACAAJ?fife=w80-h100)
Author: Publisher:
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Category :
Languages : en
Pages : 127
Book Description
In the Standard Model, CP violation in weak interactions involving quarks is parameterized by an irreducible complex phase in the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing-matrix. The precise determination of the CKM elements is a necessary ingredient for a stringent test of the Standard Model predictions, and is a crucial input for reducing the theoretical error in many New Physics searches with flavor, e.g., in the kaon sector. The unitarity of the CKM matrix is typically expressed as a triangle relationship among its parameters, where the area of the so-called Unitarity Triangle visually depicts the amount of asymmetry between the decays of B particles and their antimatter counterparts. In the past few years, the BABAR and Belle experiments have been able to measure all three angles of the triangle from CP asymmetry measurements. The first asymmetry measurements in B particle decays, about ten years ago, allowed to determine [beta], which is now known to better than 5% precision. The angles [alpha] and [gamma], measured in much rarer processes, required several years of data taking before analyses could yield reliable answers. A remarkable feature is that the direct measurement of the angles of the Unitarity Triangle generates an area that is consistent with the area predicted by measurement of the sides. In this thesis we have presented the branching fraction measurements of charged and neutral B meson decays to K1(1270)[pi] and K1(1400)[pi], obtained from a data sample of 454 million [Upsilon](4S) → B{bar B} events. This analysis is particularly challenging from the experimental side since the branching fractions involved are very low, at the level of 10−6 - 10−7, and the signal is characterized by the simultaneous presence of two overlapping resonances, which exhibit sizeable interference effects. The combined K1(1270)[pi] and K1(1400)[pi] signal is therefore modeled with a K-matrix formalism, which accounts for the effects of interference between the K1(1270) and K1(1400) mesons by introducing two effective parameters. The model is derived from the analysis, performed by the ACCMOR Collaboration, of the diffractive production of strange mesons.