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| Main Author: | |
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| Format: | Preprint |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2210.10346 |
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| _version_ | 1866910482423611392 |
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| author | LHCb collaboration |
| author_facet | LHCb collaboration |
| contents | An amplitude analysis of $B^-\to J/ψΛ\bar{p}$ decays is performed using about 4400 signal candidates selected on a data sample of $pp$ collisions recorded at center-of-mass energies of 7, 8 and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb$^{-1}$. A narrow resonance in the $J/ψΛ$ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be $4338.2\pm 0.7\pm 0.4$MeV and ${7.0\pm1.2\pm1.3}$MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be $1/2$ and negative parity is preferred. Due to the small $Q$-value of the reaction, the most precise single measurement of the $B^-$ mass to date, $5279.44\pm0.05\pm0.07$MeV, is obtained. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2210_10346 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Observation of a $J/ψΛ$ resonance consistent with a strange pentaquark candidate in $B^-\to J/ψΛ\bar{p}$ decays LHCb collaboration High Energy Physics - Experiment An amplitude analysis of $B^-\to J/ψΛ\bar{p}$ decays is performed using about 4400 signal candidates selected on a data sample of $pp$ collisions recorded at center-of-mass energies of 7, 8 and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb$^{-1}$. A narrow resonance in the $J/ψΛ$ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be $4338.2\pm 0.7\pm 0.4$MeV and ${7.0\pm1.2\pm1.3}$MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be $1/2$ and negative parity is preferred. Due to the small $Q$-value of the reaction, the most precise single measurement of the $B^-$ mass to date, $5279.44\pm0.05\pm0.07$MeV, is obtained. |
| title | Observation of a $J/ψΛ$ resonance consistent with a strange pentaquark candidate in $B^-\to J/ψΛ\bar{p}$ decays |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2210.10346 |