Observation of $B^0_s$-$\bar{B}^0_s$ mixing and measurement of mixing frequencies using semileptonic B decays
The $B^0_s$ and $B^0$ mixing frequencies, $\Delta m_s$ and $\Delta m_d$, are measured using a data sample corresponding to an integrated luminosity of 1.0 fb^{-1} collected by the LHCb experiment in $pp$ collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8x10^6 candidate events are...
| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
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2013
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| _version_ | 1826266145840168960 |
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| author | collaboration, L Aaij, R Adeva, B Adinolfi, M Adrover, C Affolder, A Ajaltouni, Z Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y Anderlini, L Anderson, J Andreassen, R Andrews, J Andrianala, F Appleby, R Gutierrez, O Archilli, F |
| author_facet | collaboration, L Aaij, R Adeva, B Adinolfi, M Adrover, C Affolder, A Ajaltouni, Z Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y Anderlini, L Anderson, J Andreassen, R Andrews, J Andrianala, F Appleby, R Gutierrez, O Archilli, F |
| author_sort | collaboration, L |
| collection | OXFORD |
| description | The $B^0_s$ and $B^0$ mixing frequencies, $\Delta m_s$ and $\Delta m_d$, are measured using a data sample corresponding to an integrated luminosity of 1.0 fb^{-1} collected by the LHCb experiment in $pp$ collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8x10^6 candidate events are selected of the type $B^0_{(s)} \to D^-_{(s)} \mu^+$ (+ anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initial-state flavour and so to resolve oscillations due to mixing. We obtain \Delta m_s = (17.93 \pm 0.22 (stat) \pm 0.15 (syst)) ps^{-1}, \Delta m_d = (0.503 \pm 0.011 (stat) \pm 0.013 (syst)) ps^{-1}. The hypothesis of no oscillations is rejected by the equivalent of 5.8 standard deviations for $B^0_s$ and 13.0 standard deviations for $B^0$. This is the first observation of $B^0_s$ mixing to be made using only semileptonic decays. |
| first_indexed | 2024-03-06T20:34:30Z |
| format | Journal article |
| id | oxford-uuid:32295a9e-b8a1-4247-87fd-4c5eb96c78e4 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T20:34:30Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | oxford-uuid:32295a9e-b8a1-4247-87fd-4c5eb96c78e42022-03-26T13:12:23ZObservation of $B^0_s$-$\bar{B}^0_s$ mixing and measurement of mixing frequencies using semileptonic B decaysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:32295a9e-b8a1-4247-87fd-4c5eb96c78e4Symplectic Elements at Oxford2013collaboration, LAaij, RAdeva, BAdinolfi, MAdrover, CAffolder, AAjaltouni, ZAlbrecht, JAlessio, FAlexander, MAli, SAlkhazov, GCartelle, PJr, AAmato, SAmerio, SAmhis, YAnderlini, LAnderson, JAndreassen, RAndrews, JAndrianala, FAppleby, RGutierrez, OArchilli, FThe $B^0_s$ and $B^0$ mixing frequencies, $\Delta m_s$ and $\Delta m_d$, are measured using a data sample corresponding to an integrated luminosity of 1.0 fb^{-1} collected by the LHCb experiment in $pp$ collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8x10^6 candidate events are selected of the type $B^0_{(s)} \to D^-_{(s)} \mu^+$ (+ anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initial-state flavour and so to resolve oscillations due to mixing. We obtain \Delta m_s = (17.93 \pm 0.22 (stat) \pm 0.15 (syst)) ps^{-1}, \Delta m_d = (0.503 \pm 0.011 (stat) \pm 0.013 (syst)) ps^{-1}. The hypothesis of no oscillations is rejected by the equivalent of 5.8 standard deviations for $B^0_s$ and 13.0 standard deviations for $B^0$. This is the first observation of $B^0_s$ mixing to be made using only semileptonic decays. |
| spellingShingle | collaboration, L Aaij, R Adeva, B Adinolfi, M Adrover, C Affolder, A Ajaltouni, Z Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y Anderlini, L Anderson, J Andreassen, R Andrews, J Andrianala, F Appleby, R Gutierrez, O Archilli, F Observation of $B^0_s$-$\bar{B}^0_s$ mixing and measurement of mixing frequencies using semileptonic B decays |
| title | Observation of $B^0_s$-$\bar{B}^0_s$ mixing and measurement of mixing
frequencies using semileptonic B decays |
| title_full | Observation of $B^0_s$-$\bar{B}^0_s$ mixing and measurement of mixing
frequencies using semileptonic B decays |
| title_fullStr | Observation of $B^0_s$-$\bar{B}^0_s$ mixing and measurement of mixing
frequencies using semileptonic B decays |
| title_full_unstemmed | Observation of $B^0_s$-$\bar{B}^0_s$ mixing and measurement of mixing
frequencies using semileptonic B decays |
| title_short | Observation of $B^0_s$-$\bar{B}^0_s$ mixing and measurement of mixing
frequencies using semileptonic B decays |
| title_sort | observation of b 0 s bar b 0 s mixing and measurement of mixing frequencies using semileptonic b decays |
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