The decay B-0 --> J/psi K-S(0) is reconstructed with J/psi --> e(+)e(-) or mu (+)mu (-) and K-S(0) --> pi (+)pi (-). From the full ALEPH dataset at LEP1 of about 4 million hadronic Z decays, 23 candidates are selected with an estimated purity of 71%, They are used to measure the CP asymmetry of this decay, given by sin 2 beta in the Standard Model, with the result sin 2 beta = 0.84(-1.04)(+0.82) +/- 0.16. This is combined with existing measurements from other experiments, and increases the confidence level that CP violation has been observed in this channel to 98%.

Study of the CP asymmetry of B-0 -> J/psi K-S(0) decays in ALEPH / Barate, R., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Merle, E., Minard, M.n., Pietrzyk, B., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., Grauges, E., Martinez, M., Merino, G., Miquel, R., Mir, L.m., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 492:3-4(2000), pp. 259-274. [10.1016/S0370-2693(00)01091-1]

Study of the CP asymmetry of B-0 -> J/psi K-S(0) decays in ALEPH

CREANZA, Donato Maria;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
2000

Abstract

The decay B-0 --> J/psi K-S(0) is reconstructed with J/psi --> e(+)e(-) or mu (+)mu (-) and K-S(0) --> pi (+)pi (-). From the full ALEPH dataset at LEP1 of about 4 million hadronic Z decays, 23 candidates are selected with an estimated purity of 71%, They are used to measure the CP asymmetry of this decay, given by sin 2 beta in the Standard Model, with the result sin 2 beta = 0.84(-1.04)(+0.82) +/- 0.16. This is combined with existing measurements from other experiments, and increases the confidence level that CP violation has been observed in this channel to 98%.
2000
Study of the CP asymmetry of B-0 -> J/psi K-S(0) decays in ALEPH / Barate, R., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Merle, E., Minard, M.n., Pietrzyk, B., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., Grauges, E., Martinez, M., Merino, G., Miquel, R., Mir, L.m., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 492:3-4(2000), pp. 259-274. [10.1016/S0370-2693(00)01091-1]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/92
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