Observation of the $Λ_b^0\rightarrow J/ψp π^-$ decay
The first observation of the Cabibbo-suppressed decay $\Lambda_b^0\rightarrow J/\psi p \pi^-$ is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 $\rm fb^{-1}$. A prominent signal is observed and the branching fraction relative t...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Published: |
2014
|
| _version_ | 1826305101201932288 |
|---|---|
| author | collaboration, L Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Akar, S Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Gutierrez, O |
| author_facet | collaboration, L Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Akar, S Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Gutierrez, O |
| author_sort | collaboration, L |
| collection | OXFORD |
| description | The first observation of the Cabibbo-suppressed decay $\Lambda_b^0\rightarrow J/\psi p \pi^-$ is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 $\rm fb^{-1}$. A prominent signal is observed and the branching fraction relative to the decay mode $\Lambda_b^0\rightarrow J/\psi p K^-$ is determined to be $$ \frac{{\cal B}(\Lambda_b^0\rightarrow J/\psi p \pi^-)}{{\cal B}(\Lambda_b^0\rightarrow J/\psi p K^-)}=0.0824\pm0.0025\:(\text{stat})\pm0.0042\:(\text{syst}). $$ A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to be $$ {\cal A}_{CP}(\Lambda_b^0\rightarrow J/\psi p \pi^-)-{\cal A}_{CP}(\Lambda_b^0\rightarrow J/\psi p K^-)=(+5.7\pm 2.4\:(\text{stat})\pm1.2\:(\text{syst}))\%, $$ which is compatible with CP symmetry at the $2.2\sigma$ level. |
| first_indexed | 2024-03-07T06:27:45Z |
| format | Journal article |
| id | oxford-uuid:f4e62a52-1e50-4a88-8948-d77fcebd11c5 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:27:45Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | oxford-uuid:f4e62a52-1e50-4a88-8948-d77fcebd11c52022-03-27T12:23:21ZObservation of the $Λ_b^0\rightarrow J/ψp π^-$ decayJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f4e62a52-1e50-4a88-8948-d77fcebd11c5Symplectic Elements at Oxford2014collaboration, LAaij, RAdeva, BAdinolfi, MAffolder, AAjaltouni, ZAkar, SAlbrecht, JAlessio, FAlexander, MAli, SAlkhazov, GCartelle, PJr, AAmato, SAmerio, SAmhis, YAn, LAnderlini, LAnderson, JAndreassen, RAndreotti, MAndrews, JAppleby, RGutierrez, OThe first observation of the Cabibbo-suppressed decay $\Lambda_b^0\rightarrow J/\psi p \pi^-$ is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 $\rm fb^{-1}$. A prominent signal is observed and the branching fraction relative to the decay mode $\Lambda_b^0\rightarrow J/\psi p K^-$ is determined to be $$ \frac{{\cal B}(\Lambda_b^0\rightarrow J/\psi p \pi^-)}{{\cal B}(\Lambda_b^0\rightarrow J/\psi p K^-)}=0.0824\pm0.0025\:(\text{stat})\pm0.0042\:(\text{syst}). $$ A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to be $$ {\cal A}_{CP}(\Lambda_b^0\rightarrow J/\psi p \pi^-)-{\cal A}_{CP}(\Lambda_b^0\rightarrow J/\psi p K^-)=(+5.7\pm 2.4\:(\text{stat})\pm1.2\:(\text{syst}))\%, $$ which is compatible with CP symmetry at the $2.2\sigma$ level. |
| spellingShingle | collaboration, L Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Akar, S Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Gutierrez, O Observation of the $Λ_b^0\rightarrow J/ψp π^-$ decay |
| title | Observation of the $Λ_b^0\rightarrow J/ψp π^-$ decay |
| title_full | Observation of the $Λ_b^0\rightarrow J/ψp π^-$ decay |
| title_fullStr | Observation of the $Λ_b^0\rightarrow J/ψp π^-$ decay |
| title_full_unstemmed | Observation of the $Λ_b^0\rightarrow J/ψp π^-$ decay |
| title_short | Observation of the $Λ_b^0\rightarrow J/ψp π^-$ decay |
| title_sort | observation of the λ b 0 rightarrow j ψp π decay |
| work_keys_str_mv | AT collaborationl observationofthelb0rightarrowjpsppdecay AT aaijr observationofthelb0rightarrowjpsppdecay AT adevab observationofthelb0rightarrowjpsppdecay AT adinolfim observationofthelb0rightarrowjpsppdecay AT affoldera observationofthelb0rightarrowjpsppdecay AT ajaltouniz observationofthelb0rightarrowjpsppdecay AT akars observationofthelb0rightarrowjpsppdecay AT albrechtj observationofthelb0rightarrowjpsppdecay AT alessiof observationofthelb0rightarrowjpsppdecay AT alexanderm observationofthelb0rightarrowjpsppdecay AT alis observationofthelb0rightarrowjpsppdecay AT alkhazovg observationofthelb0rightarrowjpsppdecay AT cartellep observationofthelb0rightarrowjpsppdecay AT jra observationofthelb0rightarrowjpsppdecay AT amatos observationofthelb0rightarrowjpsppdecay AT amerios observationofthelb0rightarrowjpsppdecay AT amhisy observationofthelb0rightarrowjpsppdecay AT anl observationofthelb0rightarrowjpsppdecay AT anderlinil observationofthelb0rightarrowjpsppdecay AT andersonj observationofthelb0rightarrowjpsppdecay AT andreassenr observationofthelb0rightarrowjpsppdecay AT andreottim observationofthelb0rightarrowjpsppdecay AT andrewsj observationofthelb0rightarrowjpsppdecay AT applebyr observationofthelb0rightarrowjpsppdecay AT gutierrezo observationofthelb0rightarrowjpsppdecay |