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Including $B^{\pm} \to D^* K^{\pm}$ Decays in the Determination of $\gamma$ via the Atwood-Dunietz-Soni Method at LHCb
| Autor principal: | |
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| Lenguaje: | eng |
| Publicado: |
2007
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| Acceso en línea: | http://cds.cern.ch/record/1035465 |
| _version_ | 1780912486401179648 |
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| author | Patel, M |
| author_facet | Patel, M |
| author_sort | Patel, M |
| collection | CERN |
| description | |
| id | cern-1035465 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2007 |
| record_format | invenio |
| spelling | cern-10354652019-09-30T06:29:59Zhttp://cds.cern.ch/record/1035465engPatel, MIncluding $B^{\pm} \to D^* K^{\pm}$ Decays in the Determination of $\gamma$ via the Atwood-Dunietz-Soni Method at LHCbDetectors and Experimental TechniquesA preliminary study has been made of the reconstruction efficiency and backgrounds to the Atwood-Dunietz-Soni (ADS) decay modes $B^{\pm}\rightarrow D^* K^{\pm}$, where the $D^*$ decays $D^0 \pi^0$ or $D^0\gamma$, and the $D^0$ subsequently decays in the $K\pi$ final state. The $D^0 \pi^0$ and $D^0\gamma$ decays have a CP-conserving phase difference of $180^{\mathrm o}$ and this provides a powerful additional constraint in the determination of the CKM angle $\gamma$ via the ADS method. The LHCb sensitivity to $\gamma$ from $B^{\pm}\rightarrow D^0 K^{\pm}$ decays in a nominal year of data (\twofb\ integrated luminosity) is in the range 5--13$^{\mathrm o}$, depending on the values of the unknown CP-conserving phases in the relevant $\overline{D}^0/D^0$ decays. For some of the phases the precision is poor and the fits do not return a Gaussian distribution of results for $\gamma$, centred at the input value. Adding the $B^{\pm}\rightarrow D^* K^{\pm}$ decays, firstly without their background, the precision on $\gamma$ is found to improve to 2--5$^{\mathrm o}$. Adding the background at the expected level, the background dominates and a larger number of phases give non-Gaussian distributions than with the $B^{\pm}\rightarrow D^0 K^{\pm}$ decay modes alone. Where the fits do converge, the precision is better or consistent with that seen with the $B^{\pm}\rightarrow D^0 K^{\pm}$ decay modes alone. Additional constraints that could be used to remove the small number of backgroundLHCb-2007-043CERN-LHCb-2007-043oai:cds.cern.ch:10354652007-06-04 |
| spellingShingle | Detectors and Experimental Techniques Patel, M Including $B^{\pm} \to D^* K^{\pm}$ Decays in the Determination of $\gamma$ via the Atwood-Dunietz-Soni Method at LHCb |
| title | Including $B^{\pm} \to D^* K^{\pm}$ Decays in the Determination of $\gamma$ via the Atwood-Dunietz-Soni Method at LHCb |
| title_full | Including $B^{\pm} \to D^* K^{\pm}$ Decays in the Determination of $\gamma$ via the Atwood-Dunietz-Soni Method at LHCb |
| title_fullStr | Including $B^{\pm} \to D^* K^{\pm}$ Decays in the Determination of $\gamma$ via the Atwood-Dunietz-Soni Method at LHCb |
| title_full_unstemmed | Including $B^{\pm} \to D^* K^{\pm}$ Decays in the Determination of $\gamma$ via the Atwood-Dunietz-Soni Method at LHCb |
| title_short | Including $B^{\pm} \to D^* K^{\pm}$ Decays in the Determination of $\gamma$ via the Atwood-Dunietz-Soni Method at LHCb |
| title_sort | including $b^{\pm} \to d^* k^{\pm}$ decays in the determination of $\gamma$ via the atwood-dunietz-soni method at lhcb |
| topic | Detectors and Experimental Techniques |
| url | http://cds.cern.ch/record/1035465 |
| work_keys_str_mv | AT patelm includingbpmtodkpmdecaysinthedeterminationofgammaviatheatwooddunietzsonimethodatlhcb |