Measurement of the $B_s$ Lifetime in Fully and Partially Reconstructed $B_s \to D_s^- (\phi \pi^- )X$ Decays in $\bar{p}-p$ Collisions at $\sqrt{s} PDF Download
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The authors present a measurement of the B{sub s}° lifetime in fully and partially reconstructed B{sub s}° → D{sub s}°([phi][pi]−)X decays in 1.3 fb−1 collected in p{bar p} collisions at √s = 1.96 Tev by the CDF II detector at the Fermilab Tevatron. They measure [tau](B{sub s}°) = 1.518 ± 0.041 (stat.) ± 0.027 (syst.) ps. The ratio of this result and the world average B° lifetime yields [tau](B{sub s}°)/[tau](B°) = 0.99 ± 0.03, which is in agreement with recent theoretical predictions.
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The authors present a measurement of the B{sub s}° lifetime in fully and partially reconstructed B{sub s}° → D{sub s}°([phi][pi]−)X decays in 1.3 fb−1 collected in p{bar p} collisions at √s = 1.96 Tev by the CDF II detector at the Fermilab Tevatron. They measure [tau](B{sub s}°) = 1.518 ± 0.041 (stat.) ± 0.027 (syst.) ps. The ratio of this result and the world average B° lifetime yields [tau](B{sub s}°)/[tau](B°) = 0.99 ± 0.03, which is in agreement with recent theoretical predictions.
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Languages : en
Pages : 4
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The authors present a measurement of the B{sub s}° meson lifetime using fully and partially reconstructed hadronic decays B{sub s}° → D{sub s}− [pi]+(X) followed by D{sub s}− → [phi][pi]−. The data sample was recorded with the CDF II detector at the Fermilab Tevatron and corresponds to an integrated luminosity of 1.3 fb−1 from p{bar p} collisions at √s = 1.96 TeV.
![Measurement of the B0 Lifetime with Partially Reconstructed B0 -] D*- L+ /u Decays PDF](https://books.google.com/books/content/images/frontcover/nlTEjwEACAAJ?fife=w80-h100)
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The B[sup 0] lifetime has been measured with a sample of 23 million B[bar B] pairs collected by the BABAR detector at the PEP-II e[sup+]e[sup -] storage ring during 1999 and 2000. Events from the semileptonic decay B[sup 0][yields] D*[sup -][ell][sup+][nu][sub[ell]] have been selected with a partial reconstruction method in which only the charged lepton and the slow[pi] from the D*[sup -][yields][bar D][sup 0][pi][sup -] decay are reconstructed. The result is[tau][sub B][sup 0]= 1.529[+-] 0.012 (stat)[+-] 0.029 (syst) ps.
![Measurement of The?_{b}{̂0} Lifetime in the Exclusive Decay?_{b}{̂0}→J/???{0} in Pp[over ̄] Collisions at Sqrt[s] PDF](https://books.google.com/books/content/images/frontcover/0ovLwgEACAAJ?fife=w80-h100)
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We measure the?{sub b}° lifetime in the fully reconstructed decay?{sub b}° → J/??° using 10.4 fb−1 of p{bar p} collisions collected with the D0 detector at √s = 1.96 TeV. The lifetime of the topologically similar decay channel B° → J/? K{sub S}° is also measured. We obtain? (?{sub b}°) = 1.303 ± 0.075 (stat.) ± 0.035 (syst.) ps and? (B°) = 1.508 ± 0.025 (stat.) ± 0.043 (syst.) ps. Using these measurements, we determine the lifetime ratio of? (?{sub b}°)/? (B°) = 0.864 ± 0.052 (stat.) ± 0.033 (syst.).
![Measurement of the Lifetime Difference and CP-violating Phase in Bs → J/ψφ [J Psi Phi] Decays PDF](https://books.google.com/books/content/images/frontcover/r57TzQEACAAJ?fife=w80-h100)
Author: Michael Milnik
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Languages : en
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Languages : en
Pages : 243
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This thesis describes the contribution of partially reconstructed hadronic decays in the world's first observation of B$0\atop{s}$-$\bar{B}$$0\atop{s}$ oscillations. The analysis is a core member of a suite of closely related studies whose combined time-dependent measurement of the B$0\atop{s}$-$\bar{B}$$0\atop{s}$ oscillation frequency [Delta]ms is of historic significance. Using a data sample of 1 fb-1 of p$\bar{p}$ collisions at √s = 1.96 TeV collected with the CDF-II detector at the Fermilab Tevatron, they find signals of 3150 partially reconstructed hadronic Bs decays from the combined decay channels B$0\atop{s}$ → D*$-\atop{s}$ [pi]+ and B$0\atop{s}$ → D$-\atop{s}$ [rho]+ with D$-\atop{s}$ → [Phi][pi]-. These events are analyzed in parallel with 2000 fully reconstructed B$0\atop{s}$ → D$-\atop{s}$ [pi]+ (D$-\atop{s}$ → [Phi][pi]-) decays. The treatment of the data is developed in stages of progressive complexity, using high-statistics samples of hadronic B0and B+ decays to study the attributes of partially reconstructed events. The analysis characterizes the data in mass and proper decay time, noting the potential of the partially reconstructed decays for precise measurement of B branching fractions and lifetimes, but consistently focusing on the effectiveness of the model for the oscillation measurement. They efficiently incorporate the measured quantities of each decay into a maximum likelihood fitting framework, from which they extract amplitude scans and a direct measurement of the oscillation frequency. The features of the amplitude scans are consistent with expected behavior, supporting the correctness of the calibrations for proper time uncertainty and flavor tagging dilution. The likelihood allows for the smooth combination of this analysis with results from other data samples, including 3500 fully reconstructed hadronic Bs events and 61,500 partially reconstructed semileptonic Bs events. The individual analyses show compelling evidence for B$0\atop{s}$-$\bar{B}$$0\atop{s}$ oscillations, and the combination yields a clear signal. The probability that random fluctuations could produce a comparable signature is 8 x 10-8, which exceeds the 5 standard deviations threshold of significance for observation. The discovery threshold would not be achieved without inclusion of the partially reconstructed hadronic decays. They measure [Delta]ms = 17.77 ± 0.10(stat) ± 0.07(syst) ps-1 and extract.
![Measurement of the Ratios of Branching Fractions B(Bs -] Ds Pi Pi Pi) PDF](https://books.google.com/books/content/images/frontcover/JyHxwQEACAAJ?fife=w80-h100)
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Languages : en
Pages : 7
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Using 355 pb−1 of data collected by the CDF II detector in p{bar p} collisions at √s = 1.96 TeV at the Fermilab Tevatron, they study the fully reconstructed hadronic decays B{sub (s)}° → D{sub (s)}−? and B{sub (s)}° → D{sub (s)}−?+?+?−. They present the first measurement of the ratio of branching fractions?(B{sub s}° → D{sub s}−?+?+?−)/?(B° → D−?+?+?−) = 1.05 ± 0.10(stat.) ± 0.22(syst.). They also update their measurement of?(B{sub s}° → D{sub s}−?+)/?(B° → D−?+) to 1.13 ± 0.08(stat.) ± 0.23(syst.) improving the statistical uncertainty by more than a factor of two. They find?(B{sub s}° → D{sub s}−?+) = [3.8 ± 0.3(stat.) ± 1.3(syst.)] x 10−3 and?(B{sub s}° → D{sub s}−?+?+?−) = [8.4 ± 0.8(stat.) ± 3.2(syst.)] x 10−3.
![A Measurement of the Neutral B Meson Lifetime Using Partially Reconstructed B0 -] D*-pi+ Decays PDF](https://books.google.com/books/content/images/frontcover/dLvVjwEACAAJ?fife=w80-h100)
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The neutral B meson lifetime has been measured with the data collected by the BABAR detector at the PEP-II storage ring during the year 2000 for a total integrated luminosity of 20.3 fb[sup -1]. The B[sup 0][yields] D*[sup -][pi][sup+] decays have been selected with a partial reconstruction method in which only the fast pion from the B[sup 0] decay and the slow pion from D*[sup -][yields][bar D][sup 0][pi][sup -] are reconstructed. The B[sup 0] lifetime has been measured to be 1.510[+-] 0.040[+-] 0.038 ps with a sample of 6971[+-] 241 reconstructed signal events.
![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 Oscillation Frequency of Bs Mesons in the Hadronic Decay Mode Bs → ΠDs (φπ)X [pi D S (phi Pi) X] with the DØ Detector at the Fermilab Tevatron Collider PDF](https://books.google.com/books/content/images/frontcover/qn3VzQEACAAJ?fife=w80-h100)
Author: Gernot A. Weber
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Languages : en
Pages : 126
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