Observation of a new baryon state in the Λb0π+π−$$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $$ mass spectrum
Abstract A new baryon state is observed in the Λb0π+π−$$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $$ mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies s$$ \sqrt{s} $$ = 7, 8 and 13 TeV, corresponding to an inte...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2021
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| Online Access: | https://hdl.handle.net/1721.1/131725 |
| _version_ | 1810973510654230528 |
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| author | Aaij, R. Abellán Beteta, C. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A Aiola, S. Ajaltouni, Z. Akar, S. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Alkhazov, G. |
| 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. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Alkhazov, G. |
| author_sort | Aaij, R. |
| collection | MIT |
| description | Abstract
A new baryon state is observed in the Λb0π+π−$$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $$ mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies s$$ \sqrt{s} $$ = 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The mass and natural width of the new state are measured to be
m
=
6072.3
±
2.9
±
0.6
±
0.2
MeV
,
Γ
=
72
±
11
±
2
MeV
,
$$ {\displaystyle \begin{array}{l}m=6072.3\pm 2.9\pm 0.6\pm 0.2\ \mathrm{MeV},\\ {}\Gamma =72\pm 11\pm 2\ \mathrm{MeV},\end{array}} $$
where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Λb0$$ {\Lambda}_{\mathrm{b}}^0 $$ baryon mass. The new state is consistent with the first radial excitation of the Λb0$$ {\Lambda}_{\mathrm{b}}^0 $$ baryon, the Λb(2S)0 resonance. Updated measurements of the masses and the upper limits on the natural widths of the previously observed Λb(5912)0 and Λb(5920)0 states are also reported. |
| first_indexed | 2024-09-23T08:08:44Z |
| format | Article |
| id | mit-1721.1/131725 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:08:44Z |
| publishDate | 2021 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1317252023-09-06T19:57:35Z Observation of a new baryon state in the Λb0π+π−$$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $$ mass spectrum Aaij, R. Abellán Beteta, C. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A Aiola, S. Ajaltouni, Z. Akar, S. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Alkhazov, G. Massachusetts Institute of Technology. Department of Physics Abstract A new baryon state is observed in the Λb0π+π−$$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $$ mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies s$$ \sqrt{s} $$ = 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The mass and natural width of the new state are measured to be m = 6072.3 ± 2.9 ± 0.6 ± 0.2 MeV , Γ = 72 ± 11 ± 2 MeV , $$ {\displaystyle \begin{array}{l}m=6072.3\pm 2.9\pm 0.6\pm 0.2\ \mathrm{MeV},\\ {}\Gamma =72\pm 11\pm 2\ \mathrm{MeV},\end{array}} $$ where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Λb0$$ {\Lambda}_{\mathrm{b}}^0 $$ baryon mass. The new state is consistent with the first radial excitation of the Λb0$$ {\Lambda}_{\mathrm{b}}^0 $$ baryon, the Λb(2S)0 resonance. Updated measurements of the masses and the upper limits on the natural widths of the previously observed Λb(5912)0 and Λb(5920)0 states are also reported. 2021-09-20T17:29:59Z 2021-09-20T17:29:59Z 2020-06-23 2020-06-26T13:27:39Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/131725 Journal of High Energy Physics. 2020 Jun 23;2020(6):136 PUBLISHER_CC en https://doi.org/10.1007/JHEP06(2020)136 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. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Alkhazov, G. Observation of a new baryon state in the Λb0π+π−$$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $$ mass spectrum |
| title | Observation of a new baryon state in the Λb0π+π−$$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $$ mass spectrum |
| title_full | Observation of a new baryon state in the Λb0π+π−$$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $$ mass spectrum |
| title_fullStr | Observation of a new baryon state in the Λb0π+π−$$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $$ mass spectrum |
| title_full_unstemmed | Observation of a new baryon state in the Λb0π+π−$$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $$ mass spectrum |
| title_short | Observation of a new baryon state in the Λb0π+π−$$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $$ mass spectrum |
| title_sort | observation of a new baryon state in the λb0π π lambda mathrm b 0 pi pi mass spectrum |
| url | https://hdl.handle.net/1721.1/131725 |
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