From 1994 to 1997, the emulsion target of the CHORUS detector was exposed to the wideband neutrino beam of the CERN SPS. In total about 100 000 charged-current neutrino interactions were located in the nuclear emulsion target and fully reconstructed. From this sample of events based on the data acquired by new automatic scanning systems, 2013 charm-decay events were selected by a pattern recognition program. They were confirmed as decays through visual inspection. Based on these events, the effective branching ratio of charmed particles into muons was determined to be B̄μ=[7. 3±0.8(stat)±0.2(syst)]×10-2. In addition, the muonic branching ratios are presented for dominating charm-decay topologies. Normalization of the muonic decays to charged-current interactions provides σμ-μ+/σcc=[3.16±0.34(stat) ±0.09(syst)]×10-3. Selecting only events with visible energy greater than 30 GeV gives a value of B̄μ that is less affected by the charm production threshold and quasi-elastic Λc + production. Combining this value with the current average of B̄μ×|Vcd|2 at the leading order yields the value of |Vcd|LO=0. 236±0.016. © 2005 Elsevier B.V. All rights reserved.
Measurement of topological muonic branching ratios of charmed hadrons produced in neutrino-induced charged-current interactions / A., K.T., G., O., R., V.D., M., D.J., R. G. C., O., M., G., U., K., P., T., M. G., C., M. T., M., K., W., B. V., D.V., P., V., G., W., B., S., E., D.C., S., O., H., S., I. R., H., T., K., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 626:1-4(2005), pp. 24-34. [10.1016/j.physletb.2005.08.082]
Measurement of topological muonic branching ratios of charmed hadrons produced in neutrino-induced charged-current interactions
DORE, Ubaldo;LOVERRE, Pier Ferruccio;ROSA, Giovanni;
2005
Abstract
From 1994 to 1997, the emulsion target of the CHORUS detector was exposed to the wideband neutrino beam of the CERN SPS. In total about 100 000 charged-current neutrino interactions were located in the nuclear emulsion target and fully reconstructed. From this sample of events based on the data acquired by new automatic scanning systems, 2013 charm-decay events were selected by a pattern recognition program. They were confirmed as decays through visual inspection. Based on these events, the effective branching ratio of charmed particles into muons was determined to be B̄μ=[7. 3±0.8(stat)±0.2(syst)]×10-2. In addition, the muonic branching ratios are presented for dominating charm-decay topologies. Normalization of the muonic decays to charged-current interactions provides σμ-μ+/σcc=[3.16±0.34(stat) ±0.09(syst)]×10-3. Selecting only events with visible energy greater than 30 GeV gives a value of B̄μ that is less affected by the charm production threshold and quasi-elastic Λc + production. Combining this value with the current average of B̄μ×|Vcd|2 at the leading order yields the value of |Vcd|LO=0. 236±0.016. © 2005 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
