# Towards the NNLL Precision in the Decay $\bar B \rightarrow X_s \gamma$

### Description

The present NLL prediction for the decay rate of the rare inclusive process {bar B} {yields} X{sub s}{gamma} has a large uncertainty due to the charm mass renormalization scheme ambiguity. We estimate that this uncertainty will be reduced by a factor of 2 at the NNLL level. This is a strong motivation for the on-going NNLL calculation, which will thus significantly increase the sensitivity of the observable {bar B} {yields} X{sub s}{gamma} to possible new degrees of freedom beyond the SM. We also give a brief status report of the NNLL calculation.

5 pages

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## What

### Description

The present NLL prediction for the decay rate of the rare inclusive process {bar B} {yields} X{sub s}{gamma} has a large uncertainty due to the charm mass renormalization scheme ambiguity. We estimate that this uncertainty will be reduced by a factor of 2 at the NNLL level. This is a strong motivation for the on-going NNLL calculation, which will thus significantly increase the sensitivity of the observable {bar B} {yields} X{sub s}{gamma} to possible new degrees of freedom beyond the SM. We also give a brief status report of the NNLL calculation.

5 pages

### Source

• To appear in the proceedings of EPS International Europhysics Conference on High Energy Physics (HEP-EPS 2005), Lisbon, Portugal, 21-27 Jul 2005

### Identifier

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• Report No.: SLAC-PUB-11586
• Grant Number: AC02-76SF00515
• Office of Scientific & Technical Information Report Number: 877989

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## When

### Creation Date

• January 5, 2006

### Added to The UNT Digital Library

• Sept. 21, 2016, 2:29 a.m.

### Description Last Updated

• Dec. 7, 2016, 11:17 p.m.

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Asatrian, Hrachia M.; Hovhannisyan, Artyom; Poghosyan, Vahagn; Inst., /Yerevan Phys.; Greub, Christoph; U., /Bern et al. Towards the NNLL Precision in the Decay $\bar B \rightarrow X_s \gamma$, article, January 5, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc875719/: accessed May 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.