Measurement Of The Time Dependence Of B0 B0 Bar Oscillations Using Inclusive Dilepton Events

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Measurement Of The Time Dependence Of B0 B0 Bar Oscillations Using Inclusive Dilepton Events

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Author :
language : en
Publisher:
Release Date : 2000

Measurement Of The Time Dependence Of B0 B0 Bar Oscillations Using Inclusive Dilepton Events written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.

Scientific And Technical Aerospace Reports

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language : en
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Release Date : 1995

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.

Energy Research Abstracts

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language : en
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Release Date : 1995

Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Power resources categories.

Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.

High Energy Physics Index

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language : en
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Release Date : 1990

High Energy Physics Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Nuclear physics categories.

Inis Atomindex

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language : en
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Release Date : 1996

Inis Atomindex written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Nuclear energy categories.

Physics Briefs

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language : en
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Release Date : 1981

Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Physics categories.

Measurement Of The B0 Anti B0 Oscillation Frequency With Inclusive Dilepton Events

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language : en
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Release Date : 2002

Measurement Of The B0 Anti B0 Oscillation Frequency With Inclusive Dilepton Events written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.

The B°-{bar B}° oscillation frequency has been measured with a sample of 23 million B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we select events in which both B mesons decay semileptonically and use the charge of the leptons to identify the flavor of each B meson. A simultaneous fit to the decay time difference distributions for opposite- and same-sign dilepton events gives [Delta]m{sub d} = 0.493 ± 0.012 (stat) ± 0.009 (syst) ps−1.

Search For Cpt And Lorentz Violation In B0 B0bar Oscillations With Inclusive Dilepton Events

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Author : B. Aubert
language : en
Publisher:
Release Date : 2006

Search For Cpt And Lorentz Violation In B0 B0bar Oscillations With Inclusive Dilepton Events written by B. Aubert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

We report preliminary results of a search for CPT and Lorentz violation in B{sup 0}-{bar B}{sup 0} oscillations using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. Using a sample of 232 million B{bar B} pairs, we search for time-dependent variations in the complex CPT parameter z = z{sub 0} +z{sub 1} cos ({Omega}{cflx t} + {phi}) where {Omega} is the Earth's sidereal frequency and {cflx t} is sidereal time. We measure Imz{sub 0} = ( -14.1 {+-} 7.3(stat.) {+-} 2.4(syst.)) x 10{sup -3}, {Delta}{Lambda} x Rez{sub 0} = ( -7.2 {+-} 4.1(stat.) {+-} 2.1(syst.)) x 10{sup -3} ps{sup -1}, Im z{sub 1} = ( -24.0 {+-} 10.7(stat.) {+-} 5.9(syst.)) x 10{sup -3}, and {Delta}{Lambda} x Re z{sub 1} = ( -18.8 {+-} 5.5(stat.) {+-} 4.0(syst.)) x 10{sup -3} ps{sup -1}, where {Delta}{Lambda} is the difference between the decay rates of the neutral B mass eigenstates. The statistical correlation between the measurements of Imz{sub 0} and {Delta}{Lambda} x Rez{sub 0} is 76%; between Imz{sub 1} and {Delta}{Lambda} x Rez{sub 1} it is 79%. These results are used to evaluate expressions involving coefficients for Lorentz and CPT violation in the general Lorentz-violating standard-model extension. In a complementary approach, we examine the spectral power of periodic variations in z over a wide range of frequencies and find no significant signal.

Measurement Of Angle Beta With Time Dependent Cpasymmetry In B0 To K K K0 Decays

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language : en
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Release Date : 2007

Measurement Of Angle Beta With Time Dependent Cpasymmetry In B0 To K K K0 Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

In the Standard Model (SM) of particle physics, the phase of the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing matrix [1, 2] is the only source of CP violation in the quark sector. Due to the interference between mixing and decay, this phase can be observed in measurements of time-dependent CP asymmetries of B° mesons. In the SM, CP asymmetries in b 2!s{bar s}s decays, such as B° 2!KK−K°, are expected to be nearly equal to those observed in tree-dominated b 2!{bar c}s decays [3]. However, because in the SM the former are dominated by loop amplitudes, new particles in those loops potentially introduce new physics at the same order as the SM process. Within the SM, deviations from the expected CP asymmetries in B° 2!KK−K° decays depend on the Dalitz plot position, but are expected to be small and positive [4]. In particular, for the decay B° 2![phi]K° they are expected to be less than 4%. BABAR extracts the time-dependent CP-violation parameters by taking into account different amplitudes and phases across the B° and {bar B}° Dalitz plots, while Belle measures it separately for B° 2![phi]K° and the rest of K+K−K° events, neglecting interference between intermediate states. The analyses presented here are based on 347 (535) million B{bar B} pairs collected with the BABAR (Belle) detector at the SLAC PEP-II (KEKB) e+e− asymmetric-energy collider. Data are collected on the [Upsilon](4S) resonance, while a fraction of about 10% is collected at approximately 40 MeV below the [Upsilon](4S) resonance, and it is used to study the background arising from e+e− 2!q{bar q} (q = u, d, s, c) continuum events. The BABAR and Belle detectors are described in detail elsewhere [5].

Observation Of B0 S Anti B0 S Oscillations

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language : en
Publisher:
Release Date : 2006

Observation Of B0 S Anti B0 S Oscillations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

The authors report the observation of B{sub s}°-{bar B}{sub s}° oscillations from a time-dependent measurement of the B{sub s}°-{bar B}{sub s}° oscillation frequency [Delta]m{sub s}. 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 5600 fully reconstructed hadronic B{sub s} decays, 3100 partially reconstructed hadronic B{sub s} decays, and 61,500 partially reconstructed semileptonic B{sub s} decays. They measure the probability as a function of proper decay time that the B{sub s} decays with the same, or opposite, flavor as the flavor at production, and they find a signal for B{sub s}°-{bar B}{sub s}° oscillations. The probability that random fluctuations could produce a comparable signal is 8 x 10−8, which exceeds 5[sigma] significance. They measure [Delta]m{sub s} = 17.77 ± 0.10(stat) ± 0.07(syst) ps−1 and extract.