Untagged bar B {yields} X{sub s+d} {gamma} CP asymmetry as a probe for new physics

Technical Report · Mon Jan 12 04:00:00 EST 2004

DOI:https://doi.org/10.2172/826635· OSTI ID:826635

Hurth, T ^[1]

---

1. SLAC

The direct CP asymmetry in the untagged inclusive channel {bar B} {yields} X{sub s+d} {gamma} provides a strict test of the standard model. It has been shown beyond the partonic level that this asymmetry is negligibly small thanks to U-spin relations and to the unitarity of the CKM matrix. In the present paper we investigate this relation beyond the SM; in particular, we analyze to which extent deviations from this prediction are possible in supersymmetric scenarios. We analyze the minimal flavour violation scenario, including tan {beta}-enhanced terms and using the complete two-loop renormalization group running. Our analysis fully takes into account also the EDM constraints on the supersymmetric phases. We investigate possible correlations between the tagged and the untagged CP asymmetries and the indirect sensitivity of the latter to the {bar B} {yields} X{sub d} {gamma} CP asymmetry. Furthermore, we derive general model-independent formulae for the branching ratios and CP asymmetries for the inclusive {bar B} {yields} X{sub d} {gamma} and {bar B} {yields} X{sub s} {gamma} modes, and update the corresponding SM predictions.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 826635
• Report Number(s): SLAC-PUB-10279
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BRANCHING RATIO
FORECASTING
PHYSICS
PROBES
RENORMALIZATION
SENSITIVITY
STANDARD MODEL
UNITARITY