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 tagliato)/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 tagliato/c(2)) ps(-1) at 95% confidence level. For chi(s) = (Delta m(s))x( tau B-s), this limit also gives chi(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.

D., B., D., C., I., D., D., D., P., G., C., G., et al. (1995). Limit On B-s(0) Oscillation Using A Jet Charge Method. PHYSICS LETTERS. SECTION B, 356(2-3), 409-422 [10.1016/0370-2693(95)00823-4].

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

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1995-01-01

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 tagliato)/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 tagliato/c(2)) ps(-1) at 95% confidence level. For chi(s) = (Delta m(s))x( tau B-s), this limit also gives chi(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
D., B., D., C., I., D., D., D., P., G., C., G., et al. (1995). Limit On B-s(0) Oscillation Using A Jet Charge Method. PHYSICS LETTERS. SECTION B, 356(2-3), 409-422 [10.1016/0370-2693(95)00823-4].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/37634
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo