Evidence for the Decay B{sub s}{sup 0}{yields}D{sub s}{sup ()}D{sub s}{sup ()} and a Measurement of {delta}{gamma}{sub s}{sup CP}/{gamma}{sub s}

• Published in: Physical review letters 2009-03, Vol.102 (9)
• Main Authors: Abazov, V. M., Alexeev, G. D., Kharzheev, Y. N., Malyshev, V. L., Tokmenin, V. V., Vertogradov, L. S., Yatsunenko, Y. A., Abbott, B., Gutierrez, P., Hossain, S., Jain, S., Rominsky, M., Severini, H., Skubic, P., Strauss, M., Abolins, M., Benitez, J. A., Brock, R., Dyer, J., Edmunds, D.
• Format: Article
• Language: English
• Subjects: B NEUTRAL MESONS; BRANCHING RATIO; EIGENSTATES; FERMILAB TEVATRON; PARTICLE DECAY; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PROTON-PROTON INTERACTIONS; TEV RANGE 01-10
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PHYSREVLETT.102.091801

We search for the semi-inclusive process B{sub s}{sup 0}{yields}D{sub s}{sup (*)}D{sub s}{sup (*)} using 2.8 fb{sup -1} of pp collisions at {radical}(s)=1.96 TeV recorded by the D0 detector operating at the Fermilab Tevatron Collider. We observe 26.6{+-}8.4 signal events with a significance above background of 3.2 standard deviations yielding a branching ratio of B(B{sub s}{sup 0}{yields}D{sub s}{sup (*)}D{sub s}{sup (*)})=0.035{+-}0.010(stat.){+-}0.011(syst.). Under certain theoretical assumptions, these double-charm final states saturate CP-even eigenstates in the B{sub s}{sup 0} decays resulting in a width difference of {delta}{gamma}{sub s}{sup CP}/{gamma}{sub s}=0.072{+-}0.021(stat.){+-}0.022(syst.)