Observation of CP Violation in B0 to K+pi- and B0 to Pi+pi- PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
The authors report observations of CP violation in the decays B° → K?− and B° →?+?− in a sample of 383 million?(4S) → B{bar B} events. They find 4372 ± 82 B° → K+?− decays and measure the direct Cp-violating charge asymmetry?{sub K?} = -0.107 ± 0.018(stat){sub -0.004}{sup +0.007}(syst), which excludes the CP-conserving hypothesis with a significance of 5.5 standard deviations. In the same sample they find 1139 ± 49 B° →?+?− decays and measure the CP-violating asymmetries S{sub??} = -0.60 ± 0.11(stat) ± 0.03(syst) and C{sub??} = -0.21 ± 0.09(stat) ± 0.02(syst). CP conservation in B° →?+{pi}− (S{sub {pi}{pi}} = C{sub {pi}{pi}} = 0) is excluded at a confidence level 1-C.L. = 8 x 10−8, corresponding to 5.4 standard deviations.
Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
The authors report observations of CP violation in the decays B° → K?− and B° →?+?− in a sample of 383 million?(4S) → B{bar B} events. They find 4372 ± 82 B° → K+?− decays and measure the direct Cp-violating charge asymmetry?{sub K?} = -0.107 ± 0.018(stat){sub -0.004}{sup +0.007}(syst), which excludes the CP-conserving hypothesis with a significance of 5.5 standard deviations. In the same sample they find 1139 ± 49 B° →?+?− decays and measure the CP-violating asymmetries S{sub??} = -0.60 ± 0.11(stat) ± 0.03(syst) and C{sub??} = -0.21 ± 0.09(stat) ± 0.02(syst). CP conservation in B° →?+{pi}− (S{sub {pi}{pi}} = C{sub {pi}{pi}} = 0) is excluded at a confidence level 1-C.L. = 8 x 10−8, corresponding to 5.4 standard deviations.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The authors present an updated search for direct CP violation in the decay B[sup 0] --> K[sup +]pi[sup -]. Using 227 million [Upsilon](4S) --> B[bar B] decays collected with the BaBar detector at the PEP-II asymmetric-energy E[sup +]e[sup -] collider at SLAC, the authors observe a total signal yield of n(K-pi[sup +]) + n(K[sup +]pi[sup -]) = 1606 [+-] 51 decays and measure the asymmetry [n(K[sup -]pi[sup +])-n(K[sup +]pi[sup -])]/[n(K[sup -]pi[sup +])+n(K[sup +]pi[sup -])] = 0.133 [+-] 0.030(stat) [+-] 0.009(syst). This measurement establishes direct CP violation in the B[sup 0] meson system at the level of 4.2 standard deviations.
Author: Publisher: ISBN: Category : Languages : en Pages : 5
Book Description
The authors present an updated search for direct CP violation in the decay B° --> Kpi−. Using 227 million [Upsilon](4S) --> B{bar B} decays collected with the BaBar detector at the PEP-II asymmetric-energy Ee− collider at SLAC, the authors observe a total signal yield of n(K-pi+) + n(K+pi−) = 1606 ± 51 decays and measure the asymmetry [n(K−pi+)-n(K+pi−)]/[n(K−pi+)+n(K+pi−)] = 0.133 ± 0.030(stat) ± 0.009(syst). This measurement establishes direct CP violation in the B° meson system at the level of 4.2 standard deviations.
Author: Paolo Gandini Publisher: Springer Science & Business Media ISBN: 3319010298 Category : Science Languages : en Pages : 179
Book Description
CP violation is a well-established phenomenon in particle physics, but until 2001 it was only observed in kaons. In the last decade, several matter-antimatter asymmetries have been observed in neutral B mesons in line with the expectations of the Standard Model of the weak interaction. Direct CP violation is also expected in the decay rates of charged B+ mesons versus that of B- mesons, though the greatest effects are present in a decay that occurs just twice in 10 million decays. Such rarity requires huge samples to study and this is exactly what the LHC, and its dedicated B-physics experiment LHCb provide. This thesis presents an analysis of the first two years of LHCb data. The author describes the first observation of the rare decay, B- → DK-, D → π-K+ and the first observation of direct CP violation in this B decay. The work constitutes essential information on the experiment’s measurement of a fundamental parameter of the theory and stands as a benchmark against which subsequent analyses of this type will be compared.
Author: C. Yeche Publisher: ISBN: Category : Languages : en Pages : 3
Book Description
The authors present BABAR experiment studies to observe CP violation in the two-body decays ({pi}K and {pi}{pi}) and the quasi two-body decays ({rho}K and {rho}{pi}) of B mesons. The results are obtained from data samples of about 89(123) million {Upsilon}(4S) {yields} B{bar B} decays collected between 1999 and 2002(2003) with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC.
Author: Publisher: ISBN: Category : Languages : en Pages : 256
Book Description
This dissertation presents a measurement of time-dependent CP-violating asymmetries in neutral B meson decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at the Stanford Linear Accelerator Center. The data sample consists of about 88 million [Upsilon](4S) 2!B{bar B} decays collected between 1999 and 2002. We study events in which one neutral B meson decay to the CP-eigenstates J/[psi] K{sub S}°, [psi](2S)K{sub S}°, [chi]{sub c1}K{sub S}°, and [eta]{sub c}K{sub S}°, or to flavor-eigenstates involving D{sup (*)}[pi]/[rho]/a1 and J/[psi]K*°(K*° 2!K [pi]−), is fully reconstructed. The flavor of the other neutral B meson is tagged at the time of its decay, mainly using the charge of identified leptons and kaons. The proper time elapsed between the meson decays is determined by measuring the distance between the decay vertices. The amplitude of the CP-violating asymmetry, which in the Standard Model is proportional to sin2[beta], is determined from a simultaneous maximum-likelihood fit to the time-difference distribution of the flavor- and CP-eigenstate samples. We measure sin2[beta] = 0.755 ± 0.074 (stat) ± 0.030 (syst).
Author: 
Author: ![Observation of Direct CP Violation in B[sup 0] --] K[sup +]pi[sup -] Decays PDF](https://books.google.com/books/content/images/frontcover/kePVjwEACAAJ?fife=w80-h100)
Author: ![Observation of Direct CP Violation in B° --] Kpi− Decays PDF](https://books.google.com/books/content/images/frontcover/C-uQAQAACAAJ?fife=w80-h100)
Author: 
Author: Paolo Gandini
Author: ![CP Violation in the B System and Relations to K --> [pi]vv Decays PDF](https://books.google.com/books/content/images/frontcover/PpXKMwEACAAJ?fife=w80-h100)
Author: Robert Fleischer![SEARCH FOR CP VIOLATION IN B --] PI H DECAYS AND B --] RHO H DECAYS WITH BABAR EXPERIMENT. PDF](https://books.google.com/books/content/images/frontcover/dtLHjwEACAAJ?fife=w80-h100)
Author: C. Yeche
Author: Robert Fleischer
Author: Robert Fleischer
Author: