B Mixing And Cp Violation At Cdf
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| Total Pages | : 4 |
| Release | : 1996 |
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The mixing of the neutral {bold B} mesons and the violation of CP symmetry in the {bold B} sector can be investigated at the Tevatron proton-antiproton collider. The most severe challenge that these measurements pose is tagging the flavor of a B meson at production. Here we present in detail the method of same side tagging (SST), which is used to obtain new measurement of the {ital B}° mass difference [Delta]{ital m{sub d}} = 0.446 ± 0.057({ital stat}) + 0. 034 - 0.031({ital syst}) ps−1. The significance of SST and other tagging methods for physics during Run II of the Tevatron is discussed.
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| Release | : 2000 |
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In March 2001, the Tevatron at Fermilab will start a new run at (square root)s = 2.0 TeV, delivering an integrated luminosity of 2 fb−1 in the first two years and more than 15 fb−1 in the following years, before the start of LHC at CERN. CDF has been upgraded to cope with the new physics program. The authors present here the prospects for measuring B mixing and CP violation during the upcoming run.
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| Release | : 2002 |
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We report recent studies of CP-violation and mixing in neutral B mesons from the CDF experiment at the Fermilab Tevatron Collider. Results of a direct measurement of the CP-violation parameter sin 2[beta] using B[sup 0][yields] J/[psi]K[sub S][sup 0] with multi flavor tagging algorithms, a search for B[sub s][sup 0] -[bar B][sub s][sup 0] mixing using semileptonic decays, and the updated precision measurements of the B[sup 0] -[bar B][sup 0] mixing parameter will be presented. The prospects for B physics with the upgraded CDF detector in the next Tevatron Collider run will also be discussed.
| Author | : Gian Piero Di Giovanni |
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| Total Pages | : 277 |
| Release | : 2008 |
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| Release | : 2000 |
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We present six time-dependent B0d mixing measurements of [Delta]md from the CDF Run I data. The CDF average is [Delta]md = .494".026".026(ps)-1. We also present a measurement of the CP-violating asymmetry sin(2[beta]) using a sample of B0/[anti B]0 [yields] J/[psi] K0s decays and report sin(2[beta]) = .79 +41-.44.
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| Total Pages | : 15 |
| Release | : 2001 |
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A major goal of experimental particle physics over the next decade is to measure the sides and angles of the Unitarity triangle redundantly, and as precisely as possible. Overconstraining the triangle will test the Cabbibo-Kobayashi-Maskawa model of quark mixing. The CDF collaboration, due to begin a second run in March 2001 with major upgrades to both the accelerator and the detector, will study the angle [beta] using B° decays, the angle [gamma] using B° and B{sub s}° decays, and a side of the triangle through the observation of B{sub s}°--{bar B}{sub s}° mixing. Projected sensitivities are driven mostly by previous measurements using data from the first run. One highlight of the Run I B physics program is a measurement of the CP violating parameter sin 2[beta] = 0.79{sub -0.44}{sup +0.41}, based on a tagged sample of 400 B° decays in the mode B0/{bar B}° → J/[psi]K{sub s}°. The technology of flavor tagging, used here as well as in numerous B°-{bar B}° mixing analyses in run I, is crucial and will be augmented in Run II with better particle identification capabilities. Exclusive all-hadronic final states will enter the data sample in Run II through a new displaced track trigger.
| Author | : Thomas E Browder |
| Publisher | : World Scientific |
| Total Pages | : 528 |
| Release | : 1998-04-04 |
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| ISBN | : 9814602760 |
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.
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| Release | : 2001 |
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The authors present six time-dependent B[sub d][sup 0] mixing measurements of[Delta]m[sub d] from the CDF Run I data. The CDF average is[Delta]m[sub d]= .494[sub[+-] 0.26][sup[+-] 0.26](ps)[sup[minus]1]. They also present a measurement of the CP-violating asymmetry sin (2[beta]) using a sample of B[sup 0]/[bar B][sup 0][r-arrow] J/[psi]K[sub s][sup 0] decays and report sin(2[beta])= .79[sub[minus].44][sup+.41].
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| Total Pages | : 6 |
| Release | : 1999 |
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The authors present six time-dependent B{sub d}° mixing measurements of [Delta]m{sub d} from the CDF Run I data. The CDF average is [Delta]m{sub d} = .494{sub {+-} 0.26}{sup {+-} 0.26}(ps)−1. They also present a measurement of the CP-violating asymmetry sin (2[beta]) using a sample of B°/{bar B}° → J/[psi]K{sub s}° decays and report sin(2[beta]) = .79{sub -.44}{sup +.41}.
| Author | : M. Giorgi |
| Publisher | : IOS Press |
| Total Pages | : 613 |
| Release | : 2006-07-25 |
| Genre | : Science |
| ISBN | : 1614990190 |
For a long time after the discovery in 1964, by Christenson, Cronin, Fitch and Turlay, that the long-lived neutral kaon decays both into three and into two pions, which has since been taken as proof of CP violation, successive new and more precise experiments confirmed the original evidence and provided results compatible with a phenomenological description confining the CP violation to the mixing between neutral kaons and antikaons. However the Standard Model, with three generations of quarks, linking as it does CP violation to the presence of a single non trivial phase in the Cabibbo-Kobayashi-Maskawa quark mixing matrix, implies that if CP violation exists at all, then it is a general property of weak interactions, appearing in transitions were amplitudes involving all three quark families interfere with each other, producing effects with a magnitude related to that of the CKM coefficients. This fact has stimulated an impressive amount of theoretical work leading in many cases to precise predictions. This publication reviews the field, from both the theoretical and experimental point of view, while planning for the forthcoming experimentation at LHC and considering possible new facilities for kaon, B meson and neutrino physics. Abstracted in Inspec
