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Study Of T And Cp Violation In B Anti B Mixing With Inclusive Dilepton Events
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Book Synopsis Study of T and CP Violation in B°-anti-B° Mixing with Inclusive Dilepton Events by :
Download or read book Study of T and CP Violation in B°-anti-B° Mixing with Inclusive Dilepton Events written by and published by . This book was released on 2001 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 +
Book Synopsis Study of T and CP Violation in B[sup 0]-anti-B[sup 0] Mixing with Inclusive Dilepton Events by :
Download or read book Study of T and CP Violation in B[sup 0]-anti-B[sup 0] Mixing with Inclusive Dilepton Events written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].
Book Synopsis Search for T and CP Violation in B0-B0bar Mixing with Inclusive Dileptons Events by :
Download or read book Search for T and CP Violation in B0-B0bar Mixing with Inclusive Dileptons Events written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Study of CP Asymmetry in B0-B{u00AF}0 Mixing with Inclusive Dilepton Events by :
Download or read book Study of CP Asymmetry in B0-B{u00AF}0 Mixing with Inclusive Dilepton Events written by and published by . This book was released on 2015 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the asymmetry ACP between same-sign inclusive dilepton samples l+l+ and l-l- (l=e, ?) from semileptonic B decays in ?(4S)→BB¯ events, using the complete data set recorded by the BABAR experiment near the ?(4S) resonance, corresponding to 471×106 BB¯ pairs. The asymmetry ACP allows comparison between the mixing probabilities P(B¯0→B0) and P(B0→B¯0), and therefore probes CP and T violation. The result, ACP=[-3.9±3.5(stat)±1.9(syst)]×10-3, is consistent with the standard model expectation.
Book Synopsis B Physics And Cp Violation: Proceedings Of The 2nd International Conference by : Thomas E Browder
Download or read book B Physics And Cp Violation: Proceedings Of The 2nd International Conference written by Thomas E Browder and published by World Scientific. This book was released on 1998-04-04 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: CP violation is one of the most subtle effects in the Standard Model of particle physics and may be the first clue to the physics that lies beyond. Charge conjugation, C, and parity, P, are symmetries of particle interactions. C corresponds to the operation of replacing a particle by its antiparticle, while P is the operation of mirror reflection. Before 1956, it was believed that these were also symmetries of the interactions of elementary particles. In 1956, C S Wu found evidence for P violation in the weak interaction. Theorists proposed that the combination of CP would be a symmetry of the weak interaction. In 1964, Christenson, Cronin, Fitch and Turlay found the first evidence for the violation of CP symmetry in the decays of kaons.Although Kobayashi and Maskawa then showed how the Standard Model can accommodate the observed CP violation, Wolfenstein pointed out that it is also possible that there is a new interaction in addition to the usual four, called the superweak interaction, which is responsible for the asymmetry. To test this idea, the observation of a different type of asymmetry, called direct CP violation, is required; in the kaon sector, very precise measurements of the ratio of kaon decay rates are necessary. In B decay modes where a second order weak process whimisically named “penguin” interferes with another suppressed, first order “tree” amplitude, it may also be possible to observe these direct CP-violating effects.B physics and CP violation is now one of the major growth areas in high energy physics. Nearly every major high energy physics laboratory now has a project underway to observe the large CP asymmetries expected in the B sector and to test the consistency of the Standard Model. The unitarity of the Kobayashi-Maskawa mixing matrix in the Standard Model implies the existence of three phases, called alpha, beta and gamma, which can be determined by the measurements of CP asymmetries in B decays. About 200 participants gathered in Hawaii in March 1997 to discuss the progress in the field, and this important book constitutes the proceedings of that conference.
Book Synopsis Time-Dependent CP Violation Measurements by : Markus Röhrken
Download or read book Time-Dependent CP Violation Measurements written by Markus Röhrken and published by Springer Science & Business Media. This book was released on 2013-10-17 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Study of CP Asymmetry in B0-B0bar Mixing with Inclusive Dilepton Events by :
Download or read book Study of CP Asymmetry in B0-B0bar Mixing with Inclusive Dilepton Events written by and published by . This book was released on 2014 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 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 by :
Download or read book 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 published by . This book was released on 2011 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis A Study of CP Violation in B Meson Decays by :
Download or read book A Study of CP Violation in B Meson Decays written by and published by . This book was released on 1995 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annual Report of the European Organization for Nuclear Research by : European Organization for Nuclear Research
Download or read book Annual Report of the European Organization for Nuclear Research written by European Organization for Nuclear Research and published by . This book was released on 2002 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radiative Correction, Mixing, and CP Violation in the B Meson System by : Soo-hyeon Nam
Download or read book Radiative Correction, Mixing, and CP Violation in the B Meson System written by Soo-hyeon Nam and published by . This book was released on 2005 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Energy Physics Index written by and published by . This book was released on 1990 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Searching for New Physics with CP Violating B Decays by :
Download or read book Searching for New Physics with CP Violating B Decays written by and published by . This book was released on 1997 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author explores the possibility of using CP violation in B decays to detect the presence of physics beyond the Standard Model. He first studies the possibility of new physics in the B-{anti B} mixing amplitude. He discusses a construction to extract information about the phase and magnitude of the new physics contribution, as well as the CKM parameters in a model independent way. He points out the difficulty of carrying through this program induced by hadronic uncertainties and discrete ambiguities, and suggests additional measurements to overcome these problems. He then studies the possibility of new physics contributions to the B meson decay amplitudes. The author emphasizes the sensitivity of the B → [phi]K{sub S} decay to these new contributions, and explains how this sensitivity can be quantified using experimental data on SU(3) related decays. Finally, he analyzes a number of models where the B decay amplitudes are modified.
Book Synopsis D0 Evidence for CP Violation and Implication for CPT Violation in B-Meson Mixing by :
Download or read book D0 Evidence for CP Violation and Implication for CPT Violation in B-Meson Mixing written by and published by . This book was released on 2010 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis CP Violation, B Mixing and B Lifetime Results from the BaBar Experiment by :
Download or read book CP Violation, B Mixing and B Lifetime Results from the BaBar Experiment written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The BABAR detector at the PEP-II asymmetric B Factory at SLAC collected a sample of 23 x 106 B{bar B} pairs in the years 1999 and 2000. Using this data sample, we measure the amplitude of the time-dependent CP-violating asymmetry in neutral B decays to the CP eigenstates J/[psi] K{sub S}°, [psi](2S) K{sub S}° and J/[psi] K{sub L}°. We find a value of sin2[beta] = 0.34 ± 0.20(stat) ± 0.05(syst). We also present preliminary measurements of the B°{bar B}° oscillation frequency and of the lifetimes of charged and neutral B mesons.
Book Synopsis Uncovering CP Violation by : Konrad Kleinknecht
Download or read book Uncovering CP Violation written by Konrad Kleinknecht and published by Springer. This book was released on 2014-03-12 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Description of experiments that uncovered the nature of CP violation and the phenomenology describing CP violation. The author Konrad Kleinknecht received the Leibniz award of the Deutsche Forschungsgemeinschaft 1990 and the Gentner-Kastler prize and medal of SFP and DPG 2001.
Download or read book Beautiful CP Violation written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CP violation is observed to date only in K[sup 0] decays and is parameterizable by a single quantity[epsilon]. Because it is one of the least understood phenomena in the Standard Model and holds a clue to baryogenesis, it must be investigated further. Highly specialized searches in K[sup 0] decays are possible. Effects in B decays are much larger. In addition to the traditional B[sub d][yields] J/[psi]K[sub S], [pi][sup+][pi][sup[minus]] asymmetries, CP violation could be searched for in already existing inclusive B data samples. The rapid B[sub s]--[anti B][sub s] oscillations cancel in untagged B[sub s] data samples, which therefore allow feasibility studies for the observation of CP violation and the extraction of CKM elements with present vertex detectors. The favored method for the extraction of the CKM angle[gamma] is shown to be unfeasible and a solution is presented involving striking direct CP violation in charged B decays. Novel methods for determining the B[sub s] mixing parameter[Delta]m are described without the traditional requirement of flavor-specific final states.
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