Measurements of Branching Fractions and CP Asymmetries in Charmless Hadronic Two-body Neutral-B Meson Decays PDF Download
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Author: 吳姿瑩
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Category :
Languages : en
Pages :
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Author: 吳姿瑩
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
![Measurements of Branching Fractions and CP-Violating Asymmetries in B Meson Decays to Charmless Two-Body States Containing a K[sup 0]. PDF](https://books.google.com/books/content/images/frontcover/JWnCjwEACAAJ?fife=w80-h100)
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Languages : en
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The authors present measurements of branching fractions and CP-violating asymmetries in decays of B mesons to two-body final states containing a K[sup 0]. The results are based on a data sample of approximately 88 million [Upsilon](4S) [yields] B[bar B] decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC.
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Languages : en
Pages : 7
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The authors present measurements of branching fractions and CP-violating asymmetries in decays of B mesons to two-body final states containing a K°. The results are based on a data sample of approximately 88 million [Upsilon](4S) → B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC.
![Measurements of Branching Fractions and CP-Violating Asymmetries in B-Meson Decays to the Charmless Two-Body States K[sup 0]pi+, K-bar[sup 0]K[sup +], and K[sup 0]K-bar[sup 0]. PDF](https://books.google.com/books/content/images/frontcover/t_n-jwEACAAJ?fife=w80-h100)
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Languages : en
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The authors present preliminary measurements of the branching fraction and the CP-violating charge asymmetry in the B[sup +] --> K[sup 0][pi][sup +] decay, and a preliminary measurement of the branching fraction of the B[sup 0] --> K[sup 0][bar K][sup 0] decay. No evidence of direct CP violation in the B[sup +] --> K[sup 0][pi][sup +] mode is observed. The B[sup 0] --> K[sup 0][bar K][sup 0] measurement constitutes the first observation of this decay channel: the probability of obtaining the result assuming the null-signal hypothesis is 3.4 x 10[sup -6]. The authors have also searched for the B[sup +] --> [bar K][sup 0]K[sup +] decay and set an upper limit on its branching fraction at 2.35 x 10[sup -6] at the 90% C.L. The branching-fraction measurements reported here are consistent with previous measurements of the same quantities, but are extracted from a data sample larger by a factor of 2.6.
Author: Alexandre Valerievich Telnov
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ISBN:
Category :
Languages : en
Pages : 446
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Author: Mark T. Allen
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ISBN: 9780549397830
Category :
Languages : en
Pages : 177
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In the Standard Model (SM) of particle physics, the charged-current couplings of the quark sector are described by the Cabibho-Kobayashi-Maskawa (CKM) matrix elements Vqq' . The consistency of multiple measurements of the sides and angles of the CKM Unitarity Triangle provides a stringent test of the SM, and also provides constraints on non-SM physics. The CKM angle alpha can be measured from the interference between B0 → pi + pi- decays with and without B 0 ↔ B¯0 mixing, in combination with the isospin related decays B+ → pi + pi- and B0 → pi 0 pi0. The B → Kpi system also exhibits interesting CP-violating features, including direct CP violation in B0 → K+pi- decays. Sum rules derived from U-spin symmetry and parameters from the B → pipi system relate the branching fraction and charge asymmetry of B +/- → K+/-pi 0 decays to other decays in the Kpi system. Based on a sample of 383 x 106 U (4S) → BB¯ decays, we report updated measurements of the branching fraction for B 0 → pi0pi0 and the time-integrated CP asymmetry, Cp0p0 . We also measure the branching fractions for B +/- → h+/-pi 0 (h+/- = pi+/- , K+/-) and the corresponding charge asymmetries Ah+/-p 0 . We find the branching ratios and asymmetries: B (B0 → pi0pi 0) = (1.47 +/- 0.25 +/- 0.12) x 10-6, B (B+/- → pi+/- pi0 = (5.02 +/- 0.46 +/- 0.29) x 10 -6, B (B+/- K +/-pi0) = (13.56 +/- 0.56 +/- 0.68) x 10-6, Cp0p0 = -0.49 +/- 0.35 +/- 0.04, Ap+/-p 0 = 0.03 +/- 0.08 +/- 0.01, and AK+/-p 0 = 0.030 +/- 0.039 +/- 0.010. Finally, we present bounds on the CKM angle alpha using isospin relations.
Author: Jinwei Wu
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Category :
Languages : en
Pages : 208
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Author: Andreas Warburton
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Category :
Languages : en
Pages : 4
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Relative branching fractions of B{sub d, s}{sup 0} {yields} h{sup +}h'{sup -} decays (where h, h' = K or {pi}) and the direct Cp asymmetry A{sub CP} in the B{sub d}{sup 0} {yields} K{sup +}{pi}{sup -} mode are measured with 179 {+-} 11 pb {sup -1} of data collected using the CDF II detector at the Fermilab Tevatron p{bar p} collider. The first branching-fraction measurement of a B{sub s}{sup 0} meson to two pseudoscalars, {Beta}(B{sub s}{sup 0} {yields} K{sup +} K{sup -}), and a search for the baryon mode {Lambda}{sub b}{sup 0} {yields} p{sup +} h{sup -} are also presented, in addition to branching-fraction limits on the rare channels B{sub s}{sup 0} {yields} K{sup +} {pi}{sup -}, B{sub d}{sup 0} {yields} K{sup +}K{sup -}, and B{sub s}{sup 0} {yields} {pi}{sup +}{pi}{sup -}.
Author: Hulya Atmacan
Publisher:
ISBN: 9781124263076
Category : B mesons
Languages : en
Pages : 195
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We present measurements of the decays B[superscript +] [arrow right] [straight phi][straight phi] K [superscript +] and B[superscript o] [arrow right] [straight phi][straight phi] K [superscript o] using about 464 million BB[superscript -] pairs collected by the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We report the branching fractions of the decays B [superscript +] [arrow right] [straight phi][straight phi] K[superscript +] and B[superscript o] [arrow right] [straight phi][straight phi] K[superscript o], and CP asymmetry in the charged B mode for [straight phi][straight phi] invariant mass below 2.85 GeV/ c 2 : [Special characters omitted.] Additionally, we measure the direct CP asymmetry in B[superscript +] [arrow right] [straight phi][straight phi] K [superscript +] for [straight phi][straight phi] invariant mass within the [eta][subcript c] resonance region ([2.94-3.02] GeV/ c 2): [Special characters omitted.] No direct CP asymmetry is observed both below the [eta][subcript c] and within the [eta][subcript c] resonance, as expected within the Standard Model. In each case the uncertainties are statistical and systematic, respectively.
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Category :
Languages : en
Pages : 301
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The thesis is organized as follows: Chapter 1 describes the theoretical framework of non-leptonic B$0\atop{s}$ → H+h'- decays, with a simple overview of the CP violation mechanism within the Standard Model and of the most used phenomenological approaches in the evaluation of strong interaction contributions. The chapter contains also a review of the theoretical expectations and the current experimental measurements along with a discussion about the importance of studying such decays. Chapter 2 contains a general description of the Tevatron collider and of the CDF II detector. Chapter 3 is devoted to the description of the data sample used for the measurement and the method used in extracting the signal from the background. Particular attention is dedicated to the on-line trigger selection, which is crucial to collect a sample enriched in B$0\atop{s}$ → h+h'- decays. Chapter 4 shows how the information from kinematics and particle identification was used to achieve a statistical discrimination amongst modes to extract individual measurements. The available resolutions in mass or in particle identification are separately insufficient for an event-by-event separation of B$0\atop{s}$ → h+h'- modes. The choice of observables and the technique used to combine them is an important and innovative aspect of the analysis described in this thesis. Chapter 5 is devoted to the accurate determination of the invariant mass lineshape. This is a crucial ingredient for resolving overlapping mass peaks. This chapter details all resolution effects with particular attention at the tails due to the emission of low-energy photons from charged kaons and pions in the final state (FSR). For the first time the effect of FSR has been accurately accounted for in a CDF analysis. Chapter 6 describes how kinematic and PID information, discussed in chap. 4 and chap. 5 were combined in a maximum Likelihood fit to statistically determine the composition of the B$0\atop{s}$ → h+h'- sample. This kinematics-PID combined fit has been developed and performed for the first time at CDF in the analysis presented in this thesis and this methodology was later inherited by several other analyses. Chapter 7 is devoted to the study of the isolation variable, which is a crucial handle to enhance the signal-to-background ratio in the off-line selection. It exploits the property that the b-hadrons tend to carry a larger fraction of the transverse momentum of the particles produced in the fragmentation, with respect to lighter hadrons. Since the simulators do not accurately reproduce the fragmentation processes, this chapter is devoted to the study of the control data sample of B$0\atop{s}$ → J/[Psi]X decays to probe the characteristics of this variable. Chapter 8 describes an innovative procedure used to optimize the selection to minimize the statistical uncertainty on the quantities one wishes to measure. The procedure is based on the fit of composition described in chap. 6. Chapter 9 reports the results of the fit of composition described in chap. 6 and the cross-checks performed to verify the goodness of the fit of composition. In order to translate the parameters returned from the fit into physics measurements the relative efficiency corrections between the various decay modes need to be applied. Chapter 10 is devoted to the description of these corrections. Chapter 11 describes the measurement of the detector-induced charge asymmetry between positively and negatively charged kaons and pions, due to their different probability of strong interaction in the tracker material using the real data. This allows to extract the acceptance correction factor for the CP asymmetries measurement without any external inputs from the simulation, and to perform a powerful check of whole analysis. Chapter 12 describes the main sources of systematic uncertainties and the method used to evaluate the signifi...
