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 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 10[sup 6] 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][sup 0], [psi](2S) K[sub S][sup 0] and J/[psi] K[sub L][sup 0]. We find a value of sin2[beta]= 0.34[+-] 0.20(stat)[+-] 0.05(syst). We also present preliminary measurements of the B[sup 0][bar B][sup 0] oscillation frequency and of the lifetimes of charged and neutral B mesons.

Download or read book CP VIOLATION MIXING AND LIFETIME RESULTS FROM BABAR written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The BABAR collaboration has analyzed 60M B[bar B] pairs collected at the[Upsilon](4S) resonance at the PEP II asymmetric collider at SLAC. Using this data sample they have measured the CP violation parameters sin(2[beta])= 0.75[+-] 0.09[sub STAT][+-] 0.04[sub SYST] and[lambda]= 0.92[+-] 0.06[sub STAT][+-] 0.02[sub SYST] from B[sup 0][yields] c[bar c]+ K[sup 0(*)]+ c.c. decays. From charmless 2-body B decays they measure A[sub K[pi]]= -0.05[+-] 0.06[+-] 0.01( -0.14,+0.05), S[sub[pi][pi]]= -0.01[+-] 0.37[+-] 0.07( -0.66,+0.62), C[sub[pi][pi]]= -0.02[+-] 0.29[+-] 0.07( -0.54,+0.48). A number of B lifetime and mixing parameters, extracted from subsamples of this data set, are also presented.

Download or read book B Physics And Cp Violation Bcp4 Proceedings Of The International Workshop written by T Ohshima and published by World Scientific. This book was released on 2001-09-25 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers the first strong evidence of the existence of CP violation in neutral B decays extracted from sophisticated B factories in the US and Japan. It also holds out the expectation of rare B decays and D, K physics in the near future. In addition, new physics beyond the Standard Model is described. Both experimental and theoretical points of view are given.

Download or read book Measurements of CP Violation Mixing and Lifetimes of B Mesons with the BaBar Detector written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the observation of CP violation in the B[sup 0] meson system. Using a novel technique for time-dependent measurements, we measure a non-zero value for the CP-violating amplitude sin2[beta] at the 4.1[sigma] level. We also report on precision measurements of the B[sup+] and B[sup 0] lifetimes and the B[sup 0][bar B][sup 0] mixing frequency[Delta]m[sub d] obtained with the same technique, and on a first measurement of the time-dependent CP-violating amplitude in B[sup 0][yields][pi][sup+][sup -] decays.

Download or read book Searches for New Physics in CP Violation from BaBar written by and published by . This book was released on 2015 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of recent searches for new physics in CP violation in charm decays from the BABAR experiment are presented. These results include a measurement of D0 - anti D0 mixing and searches for CP violation in two-body D0 decays, a search for CP violation in the charm decays D" 2!KS0K " and D s" 2!KS0K", KS0[pi]", and a search for direct CP violation in the singly-Cabibbo suppressed D" 2!K+K-[pi]"decays. These studies are based on the fi nal dataset collected by BABAR at the PEP-II B factory at SLAC in the period 1999-2008. No evidence of CP violation is found in these charm decays. The measured mixing parameter yCP = [0.72 " 0.18(stat) " 0.12(syst)]% excludes the no-mixing null hypothesis with a signifi cance of 3.3[sigma].

Download or read book Flavor Physics Proceedings Of Icfp2001 written by Yue-liang Wu and published by World Scientific. This book was released on 2002-05-14 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains many excellent articles presenting the most recent progress in high energy physics and the current interesting problems concerning flavor physics. The reader will see how flavor physics has become a central area of particle physics, with the Standard Model (SM) being subjected to increasingly precise experiments, and why the remaining puzzles in the SM, such as the mechanisms of symmetry breaking and CP violation, as well as fermion mass and mixing generation, all are mysteries hidden in the physics of flavor. The book also shows that flavor physics is likely to be a window for probing new physics beyond the SM for many years to come.

Download or read book B Decays written by Sheldon Stone and published by World Scientific. This book was released on 1994 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2nd edition is an extensive update of "B Decays?. The revisions are necessary because of the extensive amount of new data and new theoretical ideas. This book reviews what is known about b-quark decays and also looks at what can be learned in the future.The importance of this research area is increasing, as evidenced by the approval of the luminosity upgrade for CESR and the asymmetric B factories at SLAC and KEK, and the possibility of experiments at hadron colliders.The key experimental observations made thus far, measurement of the lifetimes of the different B species, B0-B0 mixing, the discovery of ?Penguin? mediated decays, and the extraction of the CKM matrix elements Vub and Vcb from semileptonic decays, as well as more mundane results, are described in great detail by the experimentalists who have been closely involved with making the measurements. Theoretical progress in understanding b-quark decays using HQET and lattice gauge techniques are described by theorists who have developed and used these techniques.Synthesizing the experimental and theoretical information, several articles discuss the implications for the ?Standard Model? and how further tests can be done using measurements of CP violation in the B system.

Download or read book CP Violation in B Decays and the BaBar Experiment written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: During the first year of data taking, the 1999-2000 run, the BABAR detector at the SLAC PEP-II asymmetric collider has collected an integrated luminosity of 20.7 fb[sup -1] corresponding to 22.7 million B[bar B] pairs at the[Upsilon](4S) resonance. Using this data, we present the measurement of sin2[beta] based on samples of B[sup 0][yields] J/[psi] K[sub S][sup 0], B[sup 0][yields][psi](2S) K[sub S][sup 0] and B[sup 0][yields] J/[psi] K[sub L][sup 0] L decays. Our measured value is sin2[beta]= 0.34[+-] 0.20 (stat)[+-] 0.05 (syst). In addition we report on the measurement of branching fractions for exclusive B decays to charmonium final states, measurements of charged and neutral B meson lifetimes and also the B[sup 0][bar B][sup 0] oscillation frequency.

Download or read book Introduction to the Standard Model written by Stuart Raby and published by Cambridge University Press. This book was released on 2021-07-08 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: Develops a practical understanding of the theoretical concepts required to understand the Standard Model for a two-semester graduate course.

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.

Download or read book BCP4 written by A. Ichiro Sanda and published by World Scientific. This book was released on 2001 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers the first strong evidence of the existence of CP violation in neutral B decays extracted from sophisticated B factories in the US and Japan. It also holds out the expectation of rare B decays and D, K physics in the near future. In addition, new physics beyond the Standard Model is described. Both experimental and theoretical points of view are given.

Download or read book BaBar Explores CP Violation written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The most recent results obtained by the BABAR experiment at the PEP-II asymmetric-energy B Factory at SLAC on CP-violating asymmetries and branching fractions for neutral and charged B decays are presented here. The analysis was performed on a data sample of[approx] 88 million[Upsilon](4S)[yields] B[bar B] decays collected between 1999 and 2002. Using b[yields] c[bar c]s decays, we measure sin2[beta]= 0.741[+-] 0.067(stat)[+-] 0.034(syst). We also present sin2[beta] measurements from, b[yields] s[bar s]s and b[yields] c[bar c]d processes. From neutral B meson decays to two-body final states of charged pions and kaons, we derive for the CP violating parameters, S[sub[pi][pi]]= 0.02[+-] 0.34[+-] 0.05[-0.54,+0.58] and C[sub[pi][pi]]= -0.30[+-] 0.25[+-] 0.04[-0.72,+0.12]. First results for B[yields][pi][sup+][pi][sup -][pi][sup 0] and K[sup[+-]][pi][sup[-+]][pi][sup 0] final states dominated by the[rho][sup[+-]] resonance, are also presented.

Download or read book Physics at the Terascale written by Ian Brock and published by John Wiley & Sons. This book was released on 2011-05-04 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by authors working at the forefront of research, this accessible treatment presents the current status of the field of collider-based particle physics at the highest energies available, as well as recent results and experimental techniques. It is clearly divided into three sections; The first covers the physics -- discussing the various aspects of the Standard Model as well as its extensions, explaining important experimental results and highlighting the expectations from the Large Hadron Collider (LHC). The second is dedicated to the involved technologies and detector concepts, and the third covers the important - but often neglected - topics of the organisation and financing of high-energy physics research. A useful resource for students and researchers from high-energy physics.

Download or read book A Measurement of the CP Parameter Sin2 Using Fully Reconstructed B Cc Decays at the BaBar Experiment written by Eric Charles and published by . This book was released on 2002 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Conference on Flavor Physics written by Yueliang Wu and published by World Scientific. This book was released on 2002 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains many excellent articles presenting the most recent progress in high energy physics and the current interesting problems concerning flavor physics. The reader will see how flavor physics has become a central area of particle physics, with the Standard Model (SM) being subjected to increasingly precise experiments, and why the remaining puzzles in the SM, such as the mechanisms of symmetry breaking and CP violation, as well as fermion mass and mixing generation, all are mysteries hidden in the physics of flavor. The book also shows that flavor physics is likely to be a window for probing new physics beyond the SM for many years to come.

Download or read book Observation of CP Violation in the B0 System written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The BABAR detector, operating at energies near the[Upsilon](4S) resonance at the PEP-II asymmetric B Factory at SLAC, has collected a sample of 32 million B[bar B] pairs by May 2001. A study of time-dependent CP-violating asymmetries in events where one neutral B meson is fully reconstructed in a final state containing charmonium has resulted in the measurement sin2[beta]= 0.59[+-] 0.14 (stat)[+-] 0.05 (syst), which establishes CP violation in the B[sup 0] meson system at the 4[sigma] level. B lifetime and mixing measurements from a sub-sample of 23 million B[bar B] pairs are also presented.

Download or read book BABAR Results on CP Violation in B Decays written by and published by . This book was released on 2013 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: