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Measurement of the Time Dependence of B0-B0(bar) Oscillations Using Inclusive Dilepton Events

Measurement of the Time Dependence of B0-B0(bar) Oscillations Using Inclusive Dilepton Events
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Release: 2001
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A preliminary study of time dependence of B[sup 0][bar B][sup 0] oscillations using dilepton events is presented. The flavor of the B meson is determined by the charge sign of the lepton. To separate signal leptons from cascade and fake leptons we have used a method which combines several discriminating variables in a neural network. The time evolution of the oscillations is studied by reconstructing the time difference between the decays of the B mesons produced by the[Upsilon](4S) decay. With an integrated luminosity of 7.7 fb[sup -1] collected on resonance by BABAR at the PEP-II asymmetric B Factory, we measure the difference in mass of the neutral B eigenstates, [Delta]m[sub B[sup 0]], to be (0.507[+-] 0.015[+-] 0.022) x 10[sup 12][Dirac-h] s[sup -1].


Measurement of the B0-anti-B0 Oscillation Frequency with Inclusive Dilepton Events

Measurement of the B0-anti-B0 Oscillation Frequency with Inclusive Dilepton Events
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Release: 2002
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The B[sup 0]-[bar B][sup 0] 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[sup -1].


Search for CPT and Lorentz Violation in B0-B0bar Oscillations with Inclusive Dilepton Events

Search for CPT and Lorentz Violation in B0-B0bar Oscillations with Inclusive Dilepton Events
Author: B. Aubert
Publisher:
Total Pages: 19
Release: 2006
Genre:
ISBN:

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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 Time-dependent B°-{anti B}° Flavor Oscillation at CDF.

Measurement of Time-dependent B°-{anti B}° Flavor Oscillation at CDF.
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Total Pages: 6
Release: 1998
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The time dependence of B°-{anti B}° oscillations has been studied using several techniques by the CDF experiment at Fermilab. The data comprise 110 pb−1 of p{anti p} collisions at √s = 1.8 TeV. Preliminary measurements of the B°-{anti B}° oscillation frequency ([Delta]m{sub d}) will be presented.


Measurement of Time-dependent B[sup 0]-[anti B][sup 0] Flavor Oscillation at CDF.

Measurement of Time-dependent B[sup 0]-[anti B][sup 0] Flavor Oscillation at CDF.
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Release: 2001
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The time dependence of B[sup 0]-[anti B][sup 0] oscillations has been studied using several techniques by the CDF experiment at Fermilab. The data comprise 110 pb[sup[minus]1] of p[anti p] collisions at[radical]s= 1.8 TeV. Preliminary measurements of the B[sup 0]-[anti B][sup 0] oscillation frequency ([Delta]m[sub d]) will be presented.


Relativistic Channeling

Relativistic Channeling
Author: R. A. Carrigan
Publisher: Springer Science & Business Media
Total Pages: 552
Release: 1987-09
Genre: Science
ISBN: 9780306426896

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Channeling, by its nature, involves a wide and disparate range of disciplines. Crystal preparation, material science, accelerator physics, sophisticated theoretical analysis and, of course, channeling itself all must work in concert in a research program. In spite of the gulfs separating some of these activities, researchers have drawn together over the last decade to carry out remarkable experiments in relativistic channeling and channeling radiation. Several informal workshops on high-energy channeling have been held over ~he years at Aarhus and Fermilab. However, with the vigorous progress in the field in the last several years it became clear that a more formal, comprehensive workshop was needed along with a book that covered the whole spectrum of the new developments, probed the future, and also laid out some of the foundations of the subject. This volume is the outcome of that process. The organization and preparation of both the volume and the workshop owe much to several outstanding scientific committees. The membership of these included J. Andersen (Aarhus), S. Baker (Fermilab), B. Berman (G. Washington), G. Bologna (Torino), E. Bonderup (Aarhus), S. Datz (Oak Ridge), J. Forster (Chalk River), F. Fujimoto (Tokyo), W. Gibson (Albany), I. Mitchell (Chalk River), Y. Ohtsuki (Waseda), R. Pantell (Stanford), S. Picraux (Sandia), J. Remillieux (Lyon), A. Saenz (NRL), V. Schegelsky (Gatchina), C. Sun (Albany), H. tiberall (Catholic U. ), E. Uggerh¢j (CERN), and R. Wedell (Humboldt). Others from across the spectrum of scientific disciplines agreed to serve as session chairmen.