Measurement of the Average $B^{0}_{s}$ Lifetime in the Decay $B^{0}_{s} \to J/\Psi\Phi$ PDF Download
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Languages : en
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![Measurement of Lifetime and Decay-Width Difference in B0s -] J/psi Phi Decays PDF](https://books.google.com/books/content/images/frontcover/_GlXAQAACAAJ?fife=w80-h100)
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Languages : en
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The authors measure the mean lifetime, [tau] = 2/([Lambda]{sub L} + [Lambda]{sub H}), and the decay-width difference, [Delta][Lambda] = [Lambda]{sub L} - [Lambda]{sub H}, of the light and heavy mass eigenstates of the B{sub s}° meson, B{sub sL}° and B{sub sH}°, in B{sub s}° → J/[psi][phi] decays using 1.7 fb−1 of data collected with the CDF II detector at the Fermilab Tevatron p{bar p} collider. Assuming CP conservation, a good approximation for the B{sub s}° system in the standard model, they obtain [Delta][Lambda] = 0.076{sub -0.063}{sup +0.059}(stat.) ± 0.006(syst.) ps−1 and [tau] = 1.52 ± 0.04(stat.) ± 0.02(syst.) ps, the most precise measurements to date. The constraints on the weak phase and [Delta][Lambda] are consistent with CP conservation.
Author: Sabato Leo
Publisher: Springer
ISBN: 3319079298
Category : Science
Languages : en
Pages : 146
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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.
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Category : Aeronautics
Languages : en
Pages : 464
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![Measurement of the Lifetime of the B0s Meson Using the Exclusive Decay Mode B0s --> J/[psi Phi] PDF](https://books.google.com/books/content/images/frontcover/L-vXNwAACAAJ?fife=w80-h100)
Author: Farrukh Azfar
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Languages : en
Pages : 176
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![Lifetime Difference in the Bs0 System from Untagged Bs0 ---] J/psi Phi Decay at S**(1/2) PDF](https://books.google.com/books/content/images/frontcover/82LujwEACAAJ?fife=w80-h100)
Author: Avdhesh Chandra
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Category :
Languages : en
Pages : 167
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In this dissertation, they present a study of the untagged decay of B{sub s}{sup 0} {yields} J/{psi}{phi}, the final state of which is a superposition of the CP-even and CP-odd states. Within the framework of the standard model (SM), to a good approximation, the two CP eigenstates of the (B{sub s}{sup 0}, {bar B}{sub s}{sup 0}) system are equivalent to mass eigenstates. The data collected by the D0 detector between June 2002 to August 2004 (an integrated luminosity of approximately 450 pb{sup -1}) has been used for the analysis presented in this thesis. From a simultaneous fit to the B{sub s}{sup 0} candidate mass, lifetime, and the angular distribution of the decay products, they obtain the CP-odd fraction in the final state at production time to be 0.16 {+-} 0.10(stat) {+-} 0.02(syst). The average lifetime of the (B{sub s}{sup 0}, {bar B}{sub s}{sup 0}) system is measured to be 1.39{sub -0.16}{sup +0.13}(stat){sub -0.02}{sup +0.01}(syst) ps, with the relative width difference between the heavy and light mass eigenstates, {Delta}{Gamma}/{bar {Gamma}} = ({Gamma}{sup L}/{Gamma}{sup H})/{bar {Gamma}} = 0.24{sub -0.38}{sup +0.28}(stat){sub -0.04}{sup +0.03}(syst). With the additional constraint from the world average of the B{sub s}{sup 0} lifetime measurements using semileptonic decays, they find average lifetime of the (B{sub s}, {sup 0}, {bar B}{sub s}{sup 0}) system 1.39 {+-} 0.06 ps with {Delta}{Gamma}/{bar {Gamma}} = 0.25{sub -0.15}{sup +0.14}. They have also done B{sup 0} lifetime measurement for its analogous decay mode to J/{psi}K*. With this measurement they get B{sup 0} lifetime 1.530 {+-} 0.043(stat) {+-} 0.023(syst) ps. Using above results, they get 0.91 {+-} 0.09(stat) {+-} 0.003(syst), for the ratio of the B{sub s}{sup 0} and B{sup 0} lifetimes ({bar {Gamma}}(B{sub s}{sup 0})/{Gamma}(B{sup 0})). These measurements are consistent with the predictions of SM within the measurement uncertainty.
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Category :
Languages : en
Pages : 7
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The authors report a measurement of the B{sub s}° lifetime in the semileptonic decay channel B{sub s}° → D{sub s}−??X (and its charge conjugate), using approximately 0.4 fb−1 of data collected with the D0 detector during 2002-2004. They have reconstructed 5176 D{sub s}−?+ signal events, where the D{sub s}− is identified via the decay D{sub s}° →??−, followed by? → K+K−. Using these events, they have measured the B{sub s}° lifetime to be?(B{sub s}°) = 1.398 ± 0.044 (stat){sub -0.025}{sup +0.028}(syst) ps. This is the most precise measurement of the B{sub s}° lifetime to date.
Author: Paul W. Balm
Publisher:
ISBN:
Category :
Languages : en
Pages : 138
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This thesis describes a measurement of the B{sub d}{sup 0} lifetime in the decay to (J/{psi}K{sub S}{sup 0}), using 114 pb{sup -1} of data collected by the D0 experiment at the Tevatron from October 15, 2002, to June 10, 2003. The measurement is motivated by the tests of the Standard Model that it makes possible. These include tests of Heavy Quark Effective Theory predicting B-meson lifetimes, and of the complex phase in the CKM-matrix as the source of CP-violation in B{sub d}{sup 0} decays to (J/{psi}K{sub S}{sup 0}).
![Lifetime Difference and CP Asymmetry in the Bs -] J/psi Phi Decay PDF](https://books.google.com/books/content/images/frontcover/6Nx7AQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 4
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The B{sub s} meson is an interesting particle to study because a sizable mixing induced CP violation in the B{sub s} -- {bar B}{sub s} system would be an indication for physics beyond the Standard Model. In this paper we present a measurement of the lifetime difference [Delta][Gamma] between the B{sub s} mass eigenstates and the CP violating phase in the decay B{sub s} → J/[psi][phi]. In 1.7 fb−1 of data collected with the CDF II detector at the Tevatron p{bar p} collider we measure [Delta][Gamma] = 0.076{sup +0.059}{sub -0.063} (stat.) ±0.006 (syst.) ps−1, well consistent with the Standard Model prediction, and a mean B{sub s} lifetime of c{sub tau}{sub s} = 456 ± 13 (stat.) ± (syst.) [mu]m. We find no evidence for CP violation.
![Measurement of the B/s0 Lifetime in B/s0 --] K+ K- Decays PDF](https://books.google.com/books/content/images/frontcover/vzFMAQAACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages : 218
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A method is presented to simultaneously separate the contributions to a sample of B{sub (s)}° 2!hh{sup {prime}-} decays, where h = [pi] or K, and measure the B meson lifetimes in the sample while correcting for the bias in the lifetime distributions due to the hadronic trigger at the CDF experiment. Using 1 fb−1 of data collected at CDF the B° lifetime is measured as [tau]{sub B°} = 1.558{sub -0.047}{sup +0.050}{sub stat} ± 0.028{sub syst} ps, in agreement with the world average measurement. The B{sub s}° lifetime in the B{sub s}° 2!KK− decay is measured as [tau]{sub B{sub s}° 2!K+K−} = 1.51{sub -0.11}{sup +0.13}{sub stat} ± 0.04{sub syst} ps. No difference is observed between the lifetime and other measurements of the average B{sub s}° lifetime or the lifetime of the light B{sub s}° mass eigenstate determined from B{sub s}° 2!J/[psi][phi] decays. With the assumptions that B{sub s}° 2!K+K− is 100% CP-even and that [tau]{sub B{sub s}°} = [tau]{sub B°} the width difference in the B{sub s}{sup 0} system is determined as [Delta][Lambda]{sup CP}/[Lambda] = 0.03{sub -0.15}{sup +0.17}{sub stat} ± 0.05{sub syst} using the current world average B{sup 0} lifetime. This is consistent with zero and with the current world average measurement.
