Observation of the decay Λ b 0 $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc1pπ−
Abstract The Cabibbo-suppressed decay Λ b 0 $$ {\...
| Main Authors: | , , , , , , , , , , , , , , |
|---|---|
| 其他作者: | |
| 格式: | 文件 |
| 语言: | English |
| 出版: |
Springer Berlin Heidelberg
2021
|
| 在线阅读: | https://hdl.handle.net/1721.1/136799 |
| _version_ | 1826213009975934976 |
|---|---|
| author | Aaij, R. Abellán Beteta, C. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Aliouche, Z. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Aaij, R. Abellán Beteta, C. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Aliouche, Z. |
| author_sort | Aaij, R. |
| collection | MIT |
| description | Abstract
The Cabibbo-suppressed decay
Λ
b
0
$$ {\Lambda}_{\mathrm{b}}^0 $$
→ χc1pπ− is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. Evidence for the
Λ
b
0
$$ {\Lambda}_{\mathrm{b}}^0 $$
→ χc2pπ− decay is also found. Using the
Λ
b
0
$$ {\Lambda}_{\mathrm{b}}^0 $$
→ χc1pK− decay as normalisation channel, the ratios of branching fractions are measured to be
B
Λ
b
0
→
χ
c
1
pπ
−
B
Λ
b
0
→
χ
c
1
pK
−
=
6.59
±
1.01
±
0.22
×
10
−
2
,
B
Λ
b
0
→
χ
c
2
pπ
−
B
Λ
b
0
→
χ
c
1
pπ
−
=
0.95
±
0.30
±
0.04
±
0.04
,
B
Λ
b
0
→
χ
c
2
pK
−
B
Λ
b
0
→
χ
c
1
pK
−
=
1.06
±
0.05
±
0.04
±
0.04
,
$$ {\displaystyle \begin{array}{c}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\uppi}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\mathrm{K}}^{-}\right)}=\left(6.59\pm 1.01\pm 0.22\right)\times {10}^{-2},\\ {}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}2}{\mathrm{p}\uppi}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\uppi}^{-}\right)}=0.95\pm 0.30\pm 0.04\pm 0.04,\\ {}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}2}{\mathrm{p}\mathrm{K}}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\mathrm{K}}^{-}\right)}=1.06\pm 0.05\pm 0.04\pm 0.04,\end{array}} $$
where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainties in the branching fractions of χc1,2 → J/ψγ decays. |
| first_indexed | 2024-09-23T15:42:13Z |
| format | Article |
| id | mit-1721.1/136799 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:42:13Z |
| publishDate | 2021 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1367992023-10-06T19:49:37Z Observation of the decay Λ b 0 $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc1pπ− Aaij, R. Abellán Beteta, C. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Aliouche, Z. Massachusetts Institute of Technology. Department of Physics Abstract The Cabibbo-suppressed decay Λ b 0 $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc1pπ− is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. Evidence for the Λ b 0 $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc2pπ− decay is also found. Using the Λ b 0 $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc1pK− decay as normalisation channel, the ratios of branching fractions are measured to be B Λ b 0 → χ c 1 pπ − B Λ b 0 → χ c 1 pK − = 6.59 ± 1.01 ± 0.22 × 10 − 2 , B Λ b 0 → χ c 2 pπ − B Λ b 0 → χ c 1 pπ − = 0.95 ± 0.30 ± 0.04 ± 0.04 , B Λ b 0 → χ c 2 pK − B Λ b 0 → χ c 1 pK − = 1.06 ± 0.05 ± 0.04 ± 0.04 , $$ {\displaystyle \begin{array}{c}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\uppi}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\mathrm{K}}^{-}\right)}=\left(6.59\pm 1.01\pm 0.22\right)\times {10}^{-2},\\ {}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}2}{\mathrm{p}\uppi}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\uppi}^{-}\right)}=0.95\pm 0.30\pm 0.04\pm 0.04,\\ {}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}2}{\mathrm{p}\mathrm{K}}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\mathrm{K}}^{-}\right)}=1.06\pm 0.05\pm 0.04\pm 0.04,\end{array}} $$ where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainties in the branching fractions of χc1,2 → J/ψγ decays. 2021-11-01T14:33:27Z 2021-11-01T14:33:27Z 2021-05-12 2021-05-16T03:11:44Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/136799 Journal of High Energy Physics. 2021 May 12;2021(5):95 PUBLISHER_CC en https://doi.org/10.1007/JHEP05(2021)095 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Berlin Heidelberg Springer Berlin Heidelberg |
| spellingShingle | Aaij, R. Abellán Beteta, C. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Aliouche, Z. Observation of the decay Λ b 0 $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc1pπ− |
| title | Observation of the decay Λ b 0 $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc1pπ− |
| title_full | Observation of the decay Λ b 0 $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc1pπ− |
| title_fullStr | Observation of the decay Λ b 0 $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc1pπ− |
| title_full_unstemmed | Observation of the decay Λ b 0 $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc1pπ− |
| title_short | Observation of the decay Λ b 0 $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc1pπ− |
| title_sort | observation of the decay λ b 0 lambda mathrm b 0 χc1pπ |
| url | https://hdl.handle.net/1721.1/136799 |
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