Search For T And Cp Violation In B0 B0bar Mixing With Inclusive Dileptons Events
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Search For T And Cp Violation In B0 B0bar Mixing With Inclusive Dileptons Events
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Author :
language : en
Publisher:
Release Date : 2003
Search For T And Cp Violation In B0 B0bar Mixing With Inclusive Dileptons Events 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 report the results of a search for T and CP violation in B[sup 0]-[bar B][sup 0] mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. The asymmetry between[ell][sup+][ell][sup+] and[ell][sup -][ell][sup -] events allows the authors to compare the probabilities for[bar B][sup 0][yields] B[sup 0] and B[sup 0][yields][bar B][sup 0] oscillations and thus probe T and CP invariance. Using a sample of 23 million B[bar B] pairs, they measure a same-sign dilepton asymmetry of A[sub T/CP]= (0.5[+-] 1.2(stat)[+-] 1.4(syst))%. For the modulus of the ratio of complex mixing parameters p and q, they obtainq/p= 0.998[+-] 0.006(stat)[+-] 0.007(syst).
Search For T Cp And Cpt Violation In B0 B0bar Mixingwith Inclusive Dilepton Events
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Author :
language : en
Publisher:
Release Date : 2006
Search For T Cp And Cpt Violation In B0 B0bar Mixingwith Inclusive Dilepton Events 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 report the results of a search for T, CP and CPT violation in B°-{bar B}° mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. Using a sample of 232 million B{bar B} pairs, with a simultaneous likelihood fit of the same-sign and opposite-sign dileptons, they measure the T and Cp violation parameter
Study Of Cp Asymmetry In B0 B0bar Mixing With Inclusive Dilepton Events
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Author :
language : en
Publisher:
Release Date : 2014
Study Of Cp Asymmetry In B0 B0bar Mixing With Inclusive Dilepton Events written by 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.
Study Of T And Cp Violation In B Sup 0 Anti B Sup 0 Mixing With Inclusive Dilepton Events
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Author :
language : en
Publisher:
Release Date : 2001
Study Of T And Cp Violation In B Sup 0 Anti B Sup 0 Mixing With Inclusive Dilepton Events written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
We report a study of T and CP violation in B[sup 0][bar B][sup 0] mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. The asymmetry between[ell][sup+][ell][sup+] and[ell][sup -][ell][sup -] allows us to compare the probabilities for[bar B][sup 0][yields] B[sup 0] and B[sup 0][yields][bar B][sup 0] oscillations and thus probe T and CP invariance. A sample of 20,381 same-sign dilepton events is selected in the 1999--2000 data sample, corresponding to an integrated luminosity of 20.7 fb[sup -1] on the[Upsilon](4S) resonance. We measure a same-sign dilepton asymmetry of A[sub T]= (0.5[+-] 1.2[+-] 1.4)%; for the parameter[epsilon][sub B] representing T and CP violations in mixing, we obtain a preliminary result of Re([epsilon][sub B])/1+[epsilon][sub B][sup 2]= (1.2[+-] 2.9[+-] 3.6) x 10[sup -3].
Study Of T And Cp Violation In B Anti B Mixing With Inclusive Dilepton Events
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Author :
language : en
Publisher:
Release Date : 2001
Study Of T And Cp Violation In B Anti B Mixing With Inclusive Dilepton Events written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
We report a study of T and CP violation in B°{bar B}° mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. The asymmetry between ll and l−l− allows us to compare the probabilities for {bar B}° 2!B° and B° 2!{bar B}° oscillations and thus probe T and CP invariance. A sample of 20,381 same-sign dilepton events is selected in the 1999--2000 data sample, corresponding to an integrated luminosity of 20.7 fb−1 on the [Upsilon](4S) resonance. We measure a same-sign dilepton asymmetry of A{sub T} = (0.5 ± 1.2 ± 1.4)%; for the parameter [epsilon]{sub B} representing T and CP violations in mixing, we obtain a preliminary result of Re([epsilon]{sub B})/1 +
Search For Mixing Induced Cp Violation Using Partial Reconstruction Of B0bar D Xl Nubar And Kaon Tagging
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Author :
language : en
Publisher:
Release Date : 2016
Search For Mixing Induced Cp Violation Using Partial Reconstruction Of B0bar D Xl Nubar And Kaon Tagging written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Measurement Of Cp Violation In B0 B0bar Mixing Using Semileptonic Decays At Lhcb
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Author : Lucia Grillo
language : en
Publisher:
Release Date : 2015
Measurement Of Cp Violation In B0 B0bar Mixing Using Semileptonic Decays At Lhcb written by Lucia Grillo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Measurement categories.
Search For Cp Violation In B0b0bar Mixing Using Partial Reconstruction Of B0 D Xl Nu And A Kaon Tag
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Author :
language : en
Publisher:
Release Date : 2014
Search For Cp Violation In B0b0bar Mixing Using Partial Reconstruction Of B0 D Xl Nu And A Kaon Tag written by 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.
D0 Evidence For Cp Violation And Implication For Cpt Violation In B Meson Mixing
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Author :
language : en
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Release Date : 2010
D0 Evidence For Cp Violation And Implication For Cpt Violation In B Meson Mixing written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
A D0 analysis measuring the charge asymmetry A{sub sl}{sup b} of like-sign dimuon events due to semileptonic b-hadron decays at the Fermilab Tevatron Collider is described. It differs by 3.2 standard deviations from the Standard Model prediction to provide first evidence of CPT-invariant anomalous CP violation in the mixing of neutral B mesons, and is compared to the CP-violating phase obtained from a D0 analysis of the time-dependent decay angles in B{sub s}° → J/[psi][phi]. If CPT violation is allowed, the dimuon asymmetry also yields the first sensitivity to CPT violation in the B{sub s}° system.
Measurement Of Cp Violation In B Anti B Mixing On The Recoil Of Partially Reconstructed Anti B0 To D L Anti Nu L Using Kaon Tags
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of Cp Violation In B Anti B Mixing On The Recoil Of Partially Reconstructed Anti B0 To D L Anti Nu L Using Kaon Tags written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
After its formulation in 1960's the Standard Model of Fundamental Interactions has gone through an impressive series of successes, begun with the discovery of neutral weak currents [1] and the experimental observations of the massive carriers of weak interactions, the W± and Z0 bosons [2], [3]. High precision measurements performed at LEP and SLAC test the validity of the theory to an unprecedented level of accuracy and do not show any significant deviations with respect to the Standard Model predictions. One of the attractive features of the Standard Model is the description of the phenomena which violate the matter-antimatter symmetry (CP), and this violation uniquely depends (in the quark sector) on a weak phase in the matrix describing the couplings among different quark flavors. CP-violation was discovered in 1964 as a tiny effect in the mixing of the K0 - $\bar{K}$0 system [12] but, after a few decades of study of the physics of K mesons, no strong confirmation of the Standard Model can be obtained on the mechanism which generates CP-violation. On the other hand the physics of B mesons is suitable for a pretty large number of measurements which can confirm or disprove this aspect of the theory. The main goal of the BABAR and Belle experiments physics program is to test the description of CP-violation and flavor physics mainly from the decays of Bu and Bd mesons. Soon after the beginning of data-taking in 1999, CP-violation was discovered in the interference between mixing and decay in the golden channel B0 → J/[Psi]}K0 [17] [18], while in 2004 a large direct charge asymmetry was observed in the B0 → K+[pi]- channel [16]. There is a third kind of CP-violation which can be exhibited by the Bd - $\bar{B}$d system, the so called CP-violation in mixing. The Standard Model predicts this asymmetry to be small, possibly out of reach of current experiments, but several New Physics models contain new particles and couplings which can enhance it up to detectable levels. In this thesis we search for CP-violation in Bd - $\bar{B}$d mixing at the BABAR experiment. We reconstruct one of the two B mesons produced at the PEP-II electromagnetic collider using the partial reconstruction technique, while the flavor of the other B is inferred by the charge of a kaon identified among its decay products. Given the smallness of the physical asymmetry we want to measure, a crucial aspect of this analysis is the control of spurious charge asymmetries arising from the interaction of particles with the detector material. We accomplish this by using a control sample of charged kaons on the same data we use in our analysis. After a brief introduction of the theoretical framework and the phenomenology of the decays of B mesons at a B-factory (chapters 1 and 2), we will review in chapter 3 the current experimental results on this topic. We will then describe the characteristics of the collider and the experimental apparatus (chapter 4) used to perform our measurement. The available dataset and the event pre-selection techniques are treated in chapter 5, while the analysis method is discussed in detail in the following one. In chapters 7 and 8 the definitions of the probability density functions used to model each component of our sample are given and then they are tested in samples of simulated data. Toy and reweighted Monte Carlo data are used in chapter 9 to test the sensitivity of our fitting procedure to the physical parameters related to CP violation; chapter 10 discusses the possibility of modeling some of the components of our sample directly on the data. Finally the fit on the real data sample is described in chapter 11 and the treatment of systematic uncertainties is done in chapter 12, while the final result is given in chapter 13.