Measurement Of Time Dependent Cp Violation In Bo D Pi Decays And Optimisation Of Flavour Tagging Algorithms At Lhcb
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Measurement Of Time Dependent Cp Violation In Bo D Pi Decays And Optimisation Of Flavour Tagging Algorithms At Lhcb
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Author : Vincenzo Battista
language : en
Publisher:
Release Date : 2018
Measurement Of Time Dependent Cp Violation In Bo D Pi Decays And Optimisation Of Flavour Tagging Algorithms At Lhcb written by Vincenzo Battista and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Mots-clés de l'auteur: B physics ; CKM angle [gamma] ; CP violation ; flavour tagging ; mixing ; LHCb ; LHC.
Time Dependent Cp Violation Measurements
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Author : Markus Röhrken
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-10-17
Time Dependent Cp Violation Measurements written by Markus Röhrken and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-17 with Science categories.
This thesis describes a high-quality, high-precision method for the data analysis of an interesting elementary particle reaction. The data was collected at the Japanese B-meson factory KEKB with the Belle detector, one of the most successful large-scale experiments worldwide. CP violation is a subtle quantum effect that makes the world look different when simultaneously left and right and matter and antimatter are exchanged. This being a prerequisite for our own world to have developed from the big bang, there are only a few experimental indications of such effects, and their detection requires very intricate techniques. The discovery of CP violation in B meson decays garnered Kobayashi and Maskawa, who had predicted these findings as early as 1973, the 2008 Nobel prize in physics. This thesis describes in great detail what are by far the best measurements of branching ratios and CP violation parameters in two special reactions with two charm mesons in the final state. It presents an in-depth but accessible overview of the theory, phenomenology, experimental setup, data collection, Monte Carlo simulations, (blind) statistical data analysis, and systematic uncertainty studies.
Time Dependent Measurement Of Cp Violation And Determination Of The Ckm Angle Using B0s D Sk Decays With The Lhcb Experiment
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Author : Matthieu Kecke
language : en
Publisher:
Release Date : 2019*
Time Dependent Measurement Of Cp Violation And Determination Of The Ckm Angle Using B0s D Sk Decays With The Lhcb Experiment written by Matthieu Kecke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019* with categories.
A Study Of Time Dependent Cp Violating Asymmetries And Flavor Oscillations In Neutral B Decays At The Upsilon 4s
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Author :
language : en
Publisher:
Release Date : 2002
A Study Of Time Dependent Cp Violating Asymmetries And Flavor Oscillations In Neutral B Decays At The Upsilon 4s written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
We present 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 29.7 fb[sup -1] recorded at the[Upsilon](4S) resonance and 3.9 fb[sup -1] off-resonance. One of the neutral B mesons, which are produced in pairs at the[Upsilon](4S), is fully reconstructed in the CP decay modes J/[psi] K[sub S][sup 0], [psi](2S) K[sub S][sup 0], [chi][sub c1] K[sub S][sup 0], J/[psi] K*[sup 0] (K*[sup 0][yields] K[sub S][sup 0][pi][sup 0]) and J/[psi] K[sub L][sup 0], or in flavor-eigenstate modes involving D(*)[pi]/[rho]/[sub 1] and J/[psi] K*[sup 0] (K*[sup 0][yields] K[sup+][pi][sup -]). The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural network tagging algorithm is used to recover events without a clear lepton or kaon tag. The proper time elapsed between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities, the time-difference resolution function, and the B[sup 0]-[bar B][sup 0] oscillation frequency[Delta]m[sub d]are measured with a sample of about 6350 fully-reconstructed B[sup 0] decays in hadronic flavor-eigenstate modes. A maximum-likelihood fit to this flavor eigenstate sample finds[Delta]m[sub d]= 0.516[+-] 0.016 (stat)[+-] 0.010 (syst) ps[sup -1]. The value of the asymmetry amplitude sin2[beta] is determined from a simultaneous maximum-likelihood fit to the time-difference distribution of the flavor-eigenstate sample and about 642 tagged B[sup 0] decays in the CP-eigenstate modes. We find sin2[beta]= 0.59[+-] 0.14 (stat)[+-] 0.05 (syst), demonstrating that CP violation exists in the neutral B meson system. We also determine the value of the CP violation parameter[lambda]= 0.93[+-] 0.09 (stat)[+-] 0.03 (syst), which is consistent with the expectation of[lambda]= 1 for no direct CP violation.
Cp Violation In B S 0 J Psi Phi Decays
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Author : Sabato Leo
language : en
Publisher: Springer
Release Date : 2014-07-24
Cp Violation In B S 0 J Psi Phi Decays written by Sabato Leo and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-07-24 with Science categories.
This thesis reports on the final measurement of the flavor-mixing phase in decays of strange-bottom mesons (B_s) into J/psi and phi mesons performed in high-energy proton-antiproton collisions recorded by the Collider Experiment at Fermilab. Interference occurs between direct decays and decays following virtual particle-antiparticle transitions (B_s-antiB_s). The phase difference between transition amplitudes (“mixing phase”) is observable and extremely sensitive to contributions from non-standard-model particles or interactions that may be very hard to detect otherwise – a fact that makes the precise measurement of the B_s mixing phase one of the most important goals of particle physics. The results presented include a precise determination of the mixing phase and a suite of other important supplementary results. All measurements are among the most precise available from a single experiment and provide significantly improved constraints on the phenomenology of new particles and interactions.
Measurement Of Cp Violation In The Decay B0 D At The Lhcb Experiment
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Author : Alex Birnkraut
language : en
Publisher:
Release Date : 2018
Measurement Of Cp Violation In The Decay B0 D At The Lhcb Experiment written by Alex Birnkraut and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Measurement categories.
Flavor Tagging Nd Cp Violation Measurements At The Tevatron
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Author :
language : en
Publisher:
Release Date : 2000
Flavor Tagging Nd Cp Violation Measurements At The Tevatron written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
The CDF collaboration has adapted several heavy flavor tagging techniques and employed them in analyses of time-dependent flavor asymmetries using data from the Tevatron Run I. The tagging algorithms were calibrated using low-P[sub t] inclusive lepton and dilepton trigger data samples. The tagging techniques were applied to a sample of [approximately] 400 B[sub d][sup 0]/[anti B][sub d][sup 0] [r-arrow] J/[psi]K[sub s][sup 0] decays and were used to measure the CP violation parameter, sin(2[beta]). Prospects for future improved measurements of the CP violation parameters at the Tevatron are briefly discussed.
Time Dependent Measurement Of Cp Violation And Determination Of The Ckm Angle Gamma Using Bs Dskpipi Decays With The Lhcb Experiment
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Author : Matthieu Kecke
language : en
Publisher:
Release Date : 2019*
Time Dependent Measurement Of Cp Violation And Determination Of The Ckm Angle Gamma Using Bs Dskpipi Decays With The Lhcb Experiment written by Matthieu Kecke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019* with categories.
Search For Cp Violation In B0 To D K0 Decays
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Author : Troels C. Petersen
language : en
Publisher:
Release Date : 2004
Search For Cp Violation In B0 To D K0 Decays written by Troels C. Petersen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Following the idea of considering three-body decays with final state B to DKpi in the pursuit of the notoriously elusive unitary angle gamma, the initial steps towards its measurement are presented. Using a sample of approximately 88 million BBbar pairs collected with the BaBar detector at the PEP-II collider, a measurement of the branching fractions BO to D+- KO pi-+ and BO to D*+- KO pi-+ are presented for the entire Dalitz region: Br(BO to D+- KO pi-+) = (4.97 +- 0.69 +- 0.55) x 10^(-4) Br(BO to D*+- KO pi-+) = (3.00 +- 0.66 +- 0.29) x 10^(-4). In both decay modes the dominant resonance is the K*+-(892) between the neutral kaon and the charged pion. Measuring the branching fractions of the corresponding resonant two-body decays yields: Br(BO to D+- K*-+) = (4.78 +- 0.58 +- 0.53) x 10^(-4) Br(BO to D*+- K*-+) = (3.22 +- 0.59 +- 0.29) x 10^(-4). Performing a time-dependent CP asymmetries fit of the resonant decay mode BO to D+- K*-+ yields: C = 0.93 +- 0.18 +- 0.03 ABS[lambda] = 0.19 +- 0.25 +- 0.04 S = 0.18 +- 0.28 +- 0.02 Delta S = 0.08 +- 0.28 +- 0.02. As the amplitude ratio ABS[lambda] is consistant with zero, no interference sensitive to gamma can be established at this point.
Measurement Of Time Dependent Cp Violation In B0 2 Eta K0 Decays
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of Time Dependent Cp Violation In B0 2 Eta K0 Decays 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.
We present a measurement of the time-dependent CP violation parameters in B0 2![eta]'K0 decays. The measurement is based on the full data sample containing 772×106 BB-bar pairs collected at the [Upsilon](4S) resonance using the Belle detector at the KEKB asymmetric-energy e+e- collider. The measured values of the mixing-induced and direct CP violation parameters are: sin 2[phi]1eff = +0.68 " 0.07 " 0.03, A[eta]'K0 = +0.03 " 0.05 " 0.04, where the first uncertainty is statistical and the second is systematic. The values obtained are the most accurate to date. Furthermore, these results are consistent with our previous measurements and with the world-average value of sin 2[phi]1 measured in B0 2!J/[psi]K0 decays.