Measurement of the B0s Lifetime Using the Semileptonic Decay Channel B0s {u2192} D-s?+vX.
Measurement of the B0s Lifetime Using the Semileptonic Decay Channel B0s {u2192} D-s?+vX.

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Published: 2009

Total Pages: 135

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We report a measurement of the B0s lifetime in the semileptonic decay channel BB0s → D-s?+vX (and its charge conjugate), using approximately 0.4 fb-1 of data collected with the DØ detector during 2002–2004. Using 5176 reconstructed D-s ?+ signal events, we have measured the B0s lifetime to be ? (B0s) = 1.398 ± 0.044 (stat)+0.028 -0.025 (syst) ps. This is the most precise measurement of the B0s lifetime to date.

Measurement of the B0s Lifetime Using the Semileptonic Decay Channel B0s 2!D-s[mu]+vX.
Measurement of the B0s Lifetime Using the Semileptonic Decay Channel B0s 2!D-s[mu]+vX.

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Published: 2009

Total Pages: 135

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We report a measurement of the B0s lifetime in the semileptonic decay channel BB0s → D-s[mu]+vX (and its charge conjugate), using approximately 0.4 fb-1 of data collected with the DØ detector during 2002-2004. Using 5176 reconstructed D-s [mu]+ signal events, we have measured the B0s lifetime to be [tau] (B0s) = 1.398 ± 0.044 (stat)+0.028 -0.025 (syst) ps. This is the most precise measurement of the B0s lifetime to date.

Measurement of the B0s Lifetime in the Flavor-specific Decay Channel B0s {u2192} D-s?+?X.
Measurement of the B0s Lifetime in the Flavor-specific Decay Channel B0s {u2192} D-s?+?X.

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Published: 2015

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We present an updated measurement of the B0s lifetime using the semileptonic decays B0s → D-s?+?X, with D–s → ?– and ? → K+K– (and the charge conjugate process). This measurement uses the full Tevatron Run II sample of proton-antiproton collisions at √s = 1.96 TeV, comprising an integrated luminosity of 10.4 fb–1. We find a flavor-specific lifetime ?fs(B0s) = 1.479 ± 0.010(stat) ± 0.021(syst) ps. This technique is also used to determine the B0 lifetime using the analogous B0 → D–?+?X decay with D– → ??– and ? → K+K–, yielding ?(B0) = 1.534 ± 0.019(stat) ± 0.021(syst) ps. Both measurements are consistent with the current world averages, and the B0s lifetime measurement is one of the most precise to date. As a result, taking advantage of the cancellation of systematic uncertainties, we determine the lifetime ratio ?fs(B0s)/?(B0) = 0.964 ± 0.013(stat) ± 0.007(syst).

Measurement of the B0s Lifetime in the Flavor-specific Decay Channel B0s 2!D-s[mu]+[nu]X.
Measurement of the B0s Lifetime in the Flavor-specific Decay Channel B0s 2!D-s[mu]+[nu]X.

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Published: 2015

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We present an updated measurement of the B0s lifetime using the semileptonic decays B0s → D-s[mu]+[nu]X, with D-s → [pi]- and [Phi] → K+K- (and the charge conjugate process). This measurement uses the full Tevatron Run II sample of proton-antiproton collisions at √s = 1.96 TeV, comprising an integrated luminosity of 10.4 fb-1. We find a flavor-specific lifetime [tau]fs(B0s) = 1.479 ± 0.010(stat) ± 0.021(syst) ps. This technique is also used to determine the B0 lifetime using the analogous B0 → D-[mu]+[nu]X decay with D- → [Phi][pi]- and [Phi] → K+K-, yielding [tau](B0) = 1.534 ± 0.019(stat) ± 0.021(syst) ps. Both measurements are consistent with the current world averages, and the B0s lifetime measurement is one of the most precise to date. As a result, taking advantage of the cancellation of systematic uncertainties, we determine the lifetime ratio [tau]fs(B0s)/[tau](B0) = 0.964 ± 0.013(stat) ± 0.007(syst).

Measurement of the B0s Lifetime in B0s {u2192} K+ K- Decays
Measurement of the B0s Lifetime in B0s {u2192} K+ K- Decays

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Published: 2009

Total Pages: 218

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A method is presented to simultaneously separate the contributions to a sample of B0s → h+h'- decays, where h = ? 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 B0 lifetime is measured as ?B0 = 1.558-0.047+0.050stat ± 0.028syst ps, in agreement with the world average measurement. The B0s lifetime in the Bs0 → K+K- decay is measured as ?B0s → K+K- = 1.51-0.11+0.13stat ± 0.04 syst ps. No difference is observed between the lifetime and other measurements of the average B0s lifetime or the lifetime of the light B0s mass eigenstate determined from B0s → J/?? decays. With the assumptions that B0s → K+K- is 100% CP-even and that ?B0s/sub = ?sub B0 the width difference in the B0s system is determined as ??CP/? = 0.03-0.15+0.17stat ± 0.05syst using the current world average B0 lifetime. This is consistent with zero and with the current world average measurement.

A Precise Measurement of the B0(s) Lifetime
A Precise Measurement of the B0(s) Lifetime

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Published: 2006

Total 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.

Measurement of B0 and B+ Lifetimes Using Semileptonic Decays at CDF.
Measurement of B0 and B+ Lifetimes Using Semileptonic Decays at CDF.

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Published: 2010

Total Pages: 75

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Lifetime measurements for B0 and B+ are presented using semileptonic decays of B mesons from 360 pb-1 of data collected by CDF's lepton plus displaced track trigger. The decays B 2!l[nu]DX, where D is either D +, D0, or D* +, are partially reconstructed from a muon or electron, a displaced track, and a fully reconstructed charm meson. The B 0 and B+ lifetimes are obtained from an unbinned maximum-likelihood fit to the proper decay length distributions. The measured lifetimes are [tau]B 0 = 1.527 ± 0.012(stat.) ± 0.023(syst.)ps and [tau]B + = 1.629 ± 0.013(stat.) ± 0.025(syst.)ps.