A lower limit is set on the B-s(0) meson oscillation parameter Delta m(s) using data collected from 1991 to 1994 by the ALEPH detector. Events with a high transverse momentum lepton and a reconstructed secondary vertex are used. The high transverse momentum leptons are produced mainly by b hadron decays, and the sign of the lepton indicates the particle/antiparticle final state in decays of neutral B mesons. The initial state is determined by a jet charge technique using both sides of the event. A maximum likelihood method is used to set a lower limit of Delta m(s). The 95% confidence level lower limit on Delta m(s) ranges between 5.2 and 6.5(h/c(2)) ps(-1) when the fraction of b quarks from Z(0) decays that form. B-s(0) mesons is varied from 8% to 16%. Assuming that the B-s(0) fraction is 12%, the lower limit would be Delta m(s) > 6.1 (h/c(2)) ps(-1) at 95% confidence level. For x(s) = Delta m(s) tau B-s, this limit also gives x(s) > 8.8 using the B-s(0) lifetime of tau(Bs) = 1.55 +/- 0.11 ps and shifting the central value of tau(Bs) down by 1 sigma.

Limit On B-s(0) Oscillation Using A Jet Charge Method / Focardi, E., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J.P., Lucotte, A., Minard, M.N., Odier, P., Pietrzyk, B., Ariztizabal, F., Chmeissani, M., Crespo, J.M., Efthymiopoulos, I., Fernandez, E., Fernandezbosman, M., Gaitan, V., Garrido, L.I., Martinez, M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 356:(1995), pp. 409-422. [10.1016/0370-2693(95)00823-4]

Limit On B-s(0) Oscillation Using A Jet Charge Method

FOCARDI, ETTORE;CIULLI, VITALIANO;
1995

Abstract

A lower limit is set on the B-s(0) meson oscillation parameter Delta m(s) using data collected from 1991 to 1994 by the ALEPH detector. Events with a high transverse momentum lepton and a reconstructed secondary vertex are used. The high transverse momentum leptons are produced mainly by b hadron decays, and the sign of the lepton indicates the particle/antiparticle final state in decays of neutral B mesons. The initial state is determined by a jet charge technique using both sides of the event. A maximum likelihood method is used to set a lower limit of Delta m(s). The 95% confidence level lower limit on Delta m(s) ranges between 5.2 and 6.5(h/c(2)) ps(-1) when the fraction of b quarks from Z(0) decays that form. B-s(0) mesons is varied from 8% to 16%. Assuming that the B-s(0) fraction is 12%, the lower limit would be Delta m(s) > 6.1 (h/c(2)) ps(-1) at 95% confidence level. For x(s) = Delta m(s) tau B-s, this limit also gives x(s) > 8.8 using the B-s(0) lifetime of tau(Bs) = 1.55 +/- 0.11 ps and shifting the central value of tau(Bs) down by 1 sigma.
1995
356
409
422
Focardi, Ettore; Casper, D.; Debonis, I.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J. P.; Lucotte, A.; Minard, M. N.; Odier, P.; Pietrzyk, B.; Ariztizabal...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/770631
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