Exotic hadrons made of five quarks (pentaquarks) are searched for in hadronic Z decays collected by the ALEPH detector at LEP. No significant signal is observed. At 95% C.L., upper limits are set on the production rates N of such particles and their charge-conjugate state per Z decay: N-Xi(1862) (.) BR(Xi(1862)(--) --> Xi(-pi-)) < 4.5 x 10(-4), N-Xi(1862)0 (.) BR(Xi(1862)(0) <8.9 x 10(-4), N-Thetac(3100)0 BR(Theta(c)(3100)(0) D*(-)p) < 6.3 x 10(-4), N-Thetac(3100)0 (.) BR(Theta(c)(3100)(0) --> D- p) < 31 X 10(-4).

Search for pentaquark states in Z decays / Schael, S., Barate, R., Brunelière, R., de Bonis, I., Decamp, D., Goy, C., Jézéquel, S., Lees, J.-P., Martin, F., Merle, E., Minard, M.-N., Pietrzyk, B., Trocmé, B., Bravo, S., Casado, M.P., Chmeissani, M., Crespo, J.M., Fernandez, E., Fernandez-Bosman, M., Garrido, Ll., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 599:1-2(2004), pp. 1-16. [10.1016/j.physletb.2004.08.021]

Search for pentaquark states in Z decays

Creanza, D.;de Filippis, N.;Iaselli, G.;
2004

Abstract

Exotic hadrons made of five quarks (pentaquarks) are searched for in hadronic Z decays collected by the ALEPH detector at LEP. No significant signal is observed. At 95% C.L., upper limits are set on the production rates N of such particles and their charge-conjugate state per Z decay: N-Xi(1862) (.) BR(Xi(1862)(--) --> Xi(-pi-)) < 4.5 x 10(-4), N-Xi(1862)0 (.) BR(Xi(1862)(0) <8.9 x 10(-4), N-Thetac(3100)0 BR(Theta(c)(3100)(0) D*(-)p) < 6.3 x 10(-4), N-Thetac(3100)0 (.) BR(Theta(c)(3100)(0) --> D- p) < 31 X 10(-4).
2004
Search for pentaquark states in Z decays / Schael, S., Barate, R., Brunelière, R., de Bonis, I., Decamp, D., Goy, C., Jézéquel, S., Lees, J.-P., Martin, F., Merle, E., Minard, M.-N., Pietrzyk, B., Trocmé, B., Bravo, S., Casado, M.P., Chmeissani, M., Crespo, J.M., Fernandez, E., Fernandez-Bosman, M., Garrido, Ll., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 599:1-2(2004), pp. 1-16. [10.1016/j.physletb.2004.08.021]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/2219
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