Measurement Of The Branching Fraction And Time Dependent Cp Asymmetry In B0 D Stern S Decays At The Belle Experiment
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Measurement Of The Branching Fraction And Time Dependent Cp Asymmetry In B0 D Stern S Decays At The Belle Experiment
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Author : Martin Ritter
language : en
Publisher:
Release Date : 2013
Measurement Of The Branching Fraction And Time Dependent Cp Asymmetry In B0 D Stern S Decays At The Belle Experiment written by Martin Ritter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Measurement Of The Branching Fraction And Time Dependent Cp Asymmetry In B0 D D K0s Decays At The Belle Experiment
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Author : Martin Ritter
language : en
Publisher:
Release Date : 2013
Measurement Of The Branching Fraction And Time Dependent Cp Asymmetry In B0 D D K0s Decays At The Belle Experiment written by Martin Ritter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Measurement Of The Branching Fraction And Time Dependent Cp Asymmetry In B0 D D K0s Decays At The Belle Experiment
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Author : Martin Ritter
language : en
Publisher:
Release Date : 2014
Measurement Of The Branching Fraction And Time Dependent Cp Asymmetry In B0 D D K0s Decays At The Belle Experiment written by Martin Ritter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Measurement Of The Branching Fraction And Time Dependent Cp Asymmetry In The Decay B0 To D D Ks
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Author :
language : en
Publisher:
Release Date : 2006
Measurement Of The Branching Fraction And Time Dependent Cp Asymmetry In The Decay B0 To D D Ks written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
The authors study the decay B° 2!D*D*− K{sub S}° using (230 ± 2) x 106 B{bar B} pairs collected by the BABAR detector at the PEP-II B factory. They measure a branching fraction [Beta](B° 2!D*D*− K{sub S}°) = (4.4 ± 0.4 ± 0.7) x 10−3 and find evidence for the decay B° 2!D*− D{sub s1}+(2536) with a statistical significance of 4.6 [sigma]. A time-dependent CP asymmetry analysis is also performed to study the possible resonant contributions to B° 2!D*+D*− K{sub S}° and the sign of cos2[beta]. Their measurement indicates that there is a sizable resonant contribution to the decay B° 2!D*+ D*− K{sub S}° from a unknown D{sub s1}+ state with large width, and that cos2[beta] is positive at the 94% confidence level under certain theoretical assumptions.
Branching Fraction And Time Dependent Cp Asymmetry In Neutral B Decays To Psi And A Neutral Pion
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Author :
language : en
Publisher:
Release Date : 2003
Branching Fraction And Time Dependent Cp Asymmetry In Neutral B Decays To Psi And A Neutral Pion written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
The invariance of physical laws under the combination of exchange of particles with antiparticles (charge conjugation, C) and reversal of coordinates (parity, P) is called CP symmetry. The violation of CP symmetry was first discovered in 1964 in the neutral kaon system, and is in general one of the great puzzles of particle physics. The recent observation of CP violation in the B meson system has been a simultaneous success for model predictions and experiment. The opportunity now exists to probe details of the underlying mechanisms. This thesis presents measurements of the branching fraction and time-dependent CP-violating asymmetry in neutral B decays to J/[psi][pi][sup 0]. The decay amplitude for this channel features both tree and penguin diagram contributions, the interference of which can yield a result for the asymmetry differing from that found in the ''golden mode'' B[sup 0][yields] J/[psi] K[sub s][sup 0]. Using the measured branching fraction and CP asymmetry, constraints are placed on the ratio of penguin to tree amplitudes in B[sup 0][yields] J/[psi][pi][sup 0]. In addition, the impact on the CP asymmetry measurement in B[sup 0][yields] J/[psi] K[sub s][sup 0] is discussed. The results are presented for e[sup+]e[sup -] annihilation data collected with the BABAR detector on the[Upsilon](4S) resonance at the PEP-II asymmetric-energy B Factory at SLAC. The measurement of the branching fraction, based on about 23 million B[bar B] pairs collected between October 1999 and October 2000, yields BF(B[sup 0][yields] J/[psi][pi][sup 0])= (2.0[+-] 0.6 (stat)[+-] 0.2(syst)) x 10[sup -5]. With about 88 million B[bar B] pairs collected during the years 1999-2002, our results for the coefficients of the cosine and sine terms of the CP asymmetry are C[sub J/[psi][pi][sup 0]]= 0.38[+-] 0.41 (stat)[+-] 0.09 (syst) and S[sub J/[psi][pi][sup 0]]= 0.05[+-] 0.49 (stat)[+-] 0.16 (syst).
Measurements Of Time Dependent Cp Asymmetry Parameters In B Meson Decays To K0 And Of Branching Fractions Of Su 3 Related Modes With Babar Experiment At Slac
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Author :
language : en
Publisher:
Release Date : 2009
Measurements Of Time Dependent Cp Asymmetry Parameters In B Meson Decays To K0 And Of Branching Fractions Of Su 3 Related Modes With Babar Experiment At Slac written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
In this thesis work we have measured the following upper limits at 90% of confidence level, for B meson decays (in units of 10-6), using a statistics of 465.0 x 106 B$ar{B}$ pairs: ?(B0 → ?K0) 1.6 ?(Bsup0/sup → ??) 1.4 ?(Bsup0/sup → ?'?') 2.1 ?(Bsup0/sup → ??) 0.52 ?(Bsup0/sup → ??) 1.6 ?(Bsup0/sup → ?'?) 1.2 ?(Bsup0/sup → ?'?) 1.7 We have no observation of any decay mode, statistical significance for our measurements is in the range 1.3-3.5 standard deviation. We have a 3.5? evidence for B → ?? and a 3.1 ? evidence for B → ?'?. The absence of observation of the Bsup0/sup → ?Ksup0/sup open an issue related to the large difference compared to the charged mode Bsup+/sup → ?Ksup+/sup branching fraction, which is measured to be 3.7 ± 0.4 ± 0.1 [118]. Our results represent substantial improvements of the previous ones [109, 110, 111] and are consistent with theoretical predictions. All these results were presented at Flavor Physics and CP Violation (FPCP) 2008 Conference, that took place in Taipei, Taiwan. They will be soon included into a paper to be submitted to Physical Review D. For time-dependent analysis, we have reconstructed 1820 ± 48 flavor-tagged Bsup0/sup → ?'Ksup0/sup events, using the final BABAR statistic of 467.4 x 10sup6/sup B$ar{B}$ pairs. We use these events to measure the time-dependent asymmetry parameters S and C. We find S = 0.59 ± 0.08 ± 0.02, and C = -0.06 ± 0.06 ± 0.02. A non-zero value of C would represent a directly CP non-conserving component in Bsup0/sup → ?'Ksup0
Measurement Of The Branching Fraction And Cp Violating Asymmetries In Neutral B Decays To D Sup D Sup
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Author :
language : en
Publisher:
Release Date : 2003
Measurement Of The Branching Fraction And Cp Violating Asymmetries In Neutral B Decays To D Sup D Sup written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
The authors present measurements of the branching fraction and CP-violating asymmetries for neutral B decays to D*[sup[+-]] D[sup[-+]]. The measurement uses a data sample for approximately 88 million[Upsilon](4S)[yields] B[bar B] decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. They measure the branching fraction to be (8.8[+-] 1.0[+-] 1.3) x 10[sup -4] and the time-integrated CP-violating asymmetry between the rates to D*[sup -] D[sup+] and D*[sup+] D[sup -] to be[Alpha]= -0.03[+-] 0.11[+-] 0.05. They also measure the time-dependent CP-violating asymmetry parameters to be S[sub -+]= -0.24[+-] 0.69[+-] 0.12, C[sub -+]= -0.22[+-] 0.37[+-] 0.10 for B[yields] D*[sup -] D[sup+] and S[sub+-]= -0.82[+-] 0.75[+-] 0.14, C[sub+-]= -0.47[+-] 0.40[+-] 0.12 for B[yields] D*[sup+] D[sup -]. In each case the first error is statistical and the second error is systematic.
Measurements Of The Branching Fraction And Time Dependent Cp Asymmetries Of B0 To J Psi Pi0 Decays
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Author : B. Aubert
language : en
Publisher:
Release Date : 2005
Measurements Of The Branching Fraction And Time Dependent Cp Asymmetries Of B0 To J Psi Pi0 Decays written by B. Aubert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
The authors present measurements of the branching fraction and time-dependent CP asymmetries in B{sup 0} {yields} J/{psi} {pi}{sup 0} decays based on (231.8 {+-} 2.6) x 10{sup 6} {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC during the years 1999-2004. We obtain a branching fraction {Beta}(B{sup 0} {yields} J/{psi}{pi}{sup 0}) = (1.94 {+-} 0.22 (stat) {+-} 0.17 (syst)) x 10{sup -5}. They also measure the CP asymmetry parameters C = -0.21 {+-} 0.26 (stat) {+-} 0.09 (syst) and S = -0.68 {+-} 0.30 (stat) {+-} 0.04 (syst). All results presented in this paper are preliminary.
Measurements Of The Branching Fraction And Time Dependent Cp Asymmetries Of B0 To J Psi Pi0 Decays
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Author : K. George
language : en
Publisher:
Release Date : 2006
Measurements Of The Branching Fraction And Time Dependent Cp Asymmetries Of B0 To J Psi Pi0 Decays written by K. George and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
We present measurements of the branching fraction and time-dependent CP asymmetries in B{sup 0} {yields} J/{psi}{pi}{sup 0} decays based on (231.8 {+-} 2.6) x 10{sup 6} {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. We obtain a branching fraction {Beta}(B{sup 0} {yields} J/{psi}{pi}{sup 0}) = (1.94 {+-} 0.22 (stat) {+-} 0.17 (syst)) x 10{sup -5}. We also measure the CP asymmetry parameters C = -0.21 {+-} 0.26 (stat) {+-} 0.06 (syst) and S = -0.68 {+-} 0.30 (stat) {+-} 0.04 (syst).
Measurement Of Cp Violation In B0 To Phi K0 And Of Branching Fraction And Cp Violation In B0 2 F0 980 K 0 Atop S
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Author :
language : en
Publisher:
Release Date : 2006
Measurement Of Cp Violation In B0 To Phi K0 And Of Branching Fraction And Cp Violation In B0 2 F0 980 K 0 Atop S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
The authors measure the time-dependent CP asymmetry parameters in B0 2!K+K-K0 based on a data sample of approximately 277 million B-meson pairs recorded at the Y(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. They reconstruct two-body B0 decays to [Phi](1020)K$0\atop{S}$ and [Phi](1020)K$0\atop{L}$. Using a time-dependent maximum-likelihood fit, they measure sin2[beta]eff([Phi]K0) = 0.48 ± 0.28 ± 0.10, and C([Phi]K0) = 0.16 ± 0.25 ± 0.09, where the first error is statistical, and the second is systematic. They also present measurements of the CP-violating asymmetries in the decay B0 2!f0(2![pi]+[pi]- )K$0\atop{S}$. The results are obtained from a data sample of 209 x 106 Y(4S) 2!B$\bar{B}$ decays, also collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. From a time-dependent maximum-likelihood fit they measure the mixing-induced CP violation parameter S(f0(980)K$0\atop{S}$) = - sin 2[beta]efff0(980)K$0\atop{S}$ = -0.95$+0.32\atop{-0.23}$ ± 0.10 and the direct CP violation parameter C(f0(980)K$0\atop{S}$) = - 0.24 ± 0.31 ± 0.15, where the first errors are statistical and the second systematic. Finally, they present a measurement of the branching fraction of the decay B0 2!f0(2![pi]+[pi]- )K$0\atop{S}$. From a time-dependent maximum likelihood fit to a data sample of 123 x 106 Y(4S) 2!B$\bar{B}$ decays they find 93.6 ± 13.6 ± 6.4 signal events corresponding to a branching fraction of [beta](B0 2!f0(980)(2![pi]+[pi]- )K0) = (6.0 ± 0.9 ± 0.6 ± 1.2) x 10-6, where the first error is statistical, the second systematic, and the third due to model uncertainties.