Missing Mass Recoiling Against the Charged D
This paper chronicles the investigation of a peak in the BaBar mass data set of mass recoiling against charged D*s. Our hypothesis is that the peak at 2620 MeV is a reflection of the D{sub s}* and {pi} system. Specifically, we explored the idea that the peak might be a reflection from the decay B {yields} D**{sup -} D*{sub s}{sup +} with the D**{sup -} {yields} D*{sup -} {pi}. Theoretically, when the D**{sup -} decays, the trajectory of the resulting {pi} will form an angle with the D*{sub s}{sup +}, and different angles impart difference masses to the system over a range of a GeV or so. If quantum mechanics dictates that their paths will form a particular angle more often than others, a peak would appear in the histogram of their collective mass. Using the Monte Carlo model of particle collision events, Anders Ryd's EVTGEN program, C++ code derived from GeneratorsQA, and PAW, we tested the hypothesis that the peak might be a reflection of the system, but found that this possible explanation could not account for the peak. No 2620 MeV peak appears in the histogram of the system mass. We therefore discount the hypothesis and conclude that some other reflection, statistical fluctuation, or particle is causing the peak.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 815641
- Report Number(s):
- SLAC-TN-03-011; TRN: US0304677
- Resource Relation:
- Other Information: PBD: 5 Sep 2003
- Country of Publication:
- United States
- Language:
- English
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