Observation of the Λ0b → J / ψΞ−K+  decay

the CMS Collaboration; A Hayrapetyan; David B Anthony; Jim Brooke; Aaron Bundock; Florian J J Bury; Emyr J Clement; David G Cussans; H. Flächer; Maciej Glowacki; Joel Goldstein; Helen F Heath; Lukasz Kreczko; Benjamin Edward Krikler; Sudarshan Paramesvaran; Sarah A Seif El Nasr; Vincent J Smith; Nicolas Stylianou; Katie L M R Walkingshaw Pass; Robert S White; et al.

doi:10.1140/epjc/s10052-024-13114-9

Observation of the Λ⁰_b→ J / ψΞ⁻K⁺ decay

the CMS Collaboration, A Hayrapetyan, David B Anthony, Jim Brooke, Aaron Bundock, Florian J J Bury, Emyr J Clement, David G Cussans, H. Flächer, Maciej Glowacki, Joel Goldstein, Helen F Heath, Lukasz Kreczko, Benjamin Edward Krikler, Sudarshan Paramesvaran, Sarah A Seif El Nasr, Vincent J Smith, Nicolas Stylianou, Katie L M R Walkingshaw Pass, Robert S Whiteet al.

Research output: Contribution to journal › Article (Academic Journal) › peer-review

9 Citations (Scopus)

Abstract

Using proton–proton collision data corresponding to an integrated luminosity of 140 fb⁻¹collected by the CMS experiment at √s = 13 TeV, the Λ⁰_b→ J / ψΞ⁻K⁺decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the Λ⁰_b→ψ(2S)Λ decay, is measured to be B(Λ⁰_b→ J / ψΞ⁻K⁺)/B(Λ⁰_b→ψ(2S)Λ) =[3.38 ± 1.02 ± 0.61 ± 0.03] %, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in B(ψ(2S) → J / ψπ⁺π⁻)
and B(Ξ⁻→ Λπ⁻)
.

Original language	English
Article number	1062
Number of pages	24
Journal	European Physical Journal C: Particles and Fields
Volume	84
Issue number	10
DOIs	https://doi.org/10.1140/epjc/s10052-024-13114-9
Publication status	Published - 15 Oct 2024

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Publisher Copyright:
© The Author(s) 2024.

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the CMS Collaboration, Hayrapetyan, A., Anthony, D. B., Brooke, J., Bundock, A., Bury, F. J. J., Clement, E. J., Cussans, D. G., Flächer, H., Glowacki, M., Goldstein, J., Heath, H. F., Kreczko, L., Krikler, B. E., Paramesvaran, S., Seif El Nasr, S. A., Smith, V. J., Stylianou, N., Walkingshaw Pass, K. L. M. R., ... al., E. (2024). Observation of the Λ⁰_b→ J / ψΞ⁻K⁺ decay. European Physical Journal C: Particles and Fields, 84(10), Article 1062. https://doi.org/10.1140/epjc/s10052-024-13114-9

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title = "Observation of the Λ0b → J / ψΞ−K+ decay",

abstract = "Using proton–proton collision data corresponding to an integrated luminosity of 140 fb−1 collected by the CMS experiment at √s = 13 TeV, the Λ0b → J / ψΞ−K+ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the Λ0b→ψ(2S)Λ decay, is measured to be B(Λ0b → J / ψΞ−K+)/B(Λ0b→ψ(2S)Λ) =[3.38 ± 1.02 ± 0.61 ± 0.03] \%, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in B(ψ(2S) → J / ψπ+π−) and B(Ξ− → Λπ−) .",

author = "\{the CMS Collaboration\} and A Hayrapetyan and Anthony, \{David B\} and Jim Brooke and Aaron Bundock and Bury, \{Florian J J\} and Clement, \{Emyr J\} and Cussans, \{David G\} and H. Fl{\"a}cher and Maciej Glowacki and Joel Goldstein and Heath, \{Helen F\} and Lukasz Kreczko and Krikler, \{Benjamin Edward\} and Sudarshan Paramesvaran and \{Seif El Nasr\}, \{Sarah A\} and Smith, \{Vincent J\} and Nicolas Stylianou and \{Walkingshaw Pass\}, \{Katie L M R\} and White, \{Robert S\} and et al.",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2024.",

year = "2024",

month = oct,

day = "15",

doi = "10.1140/epjc/s10052-024-13114-9",

language = "English",

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the CMS Collaboration, Hayrapetyan, A, Anthony, DB, Brooke, J , Bundock, A , Bury, FJJ , Clement, EJ , Cussans, DG , Flächer, H, Glowacki, M, Goldstein, J, Heath, HF, Kreczko, L, Krikler, BE, Paramesvaran, S, Seif El Nasr, SA, Smith, VJ, Stylianou, N, Walkingshaw Pass, KLMR, White, RS & al., E 2024, 'Observation of the Λ⁰_b→ J / ψΞ⁻K⁺ decay', European Physical Journal C: Particles and Fields, vol. 84, no. 10, 1062. https://doi.org/10.1140/epjc/s10052-024-13114-9

TY - JOUR

T1 - Observation of the Λ0b → J / ψΞ−K+ decay

AU - the CMS Collaboration

AU - Hayrapetyan, A

AU - Anthony, David B

AU - Brooke, Jim

AU - Bundock, Aaron

AU - Bury, Florian J J

AU - Clement, Emyr J

AU - Cussans, David G

AU - Flächer, H.

AU - Glowacki, Maciej

AU - Goldstein, Joel

AU - Heath, Helen F

AU - Kreczko, Lukasz

AU - Krikler, Benjamin Edward

AU - Paramesvaran, Sudarshan

AU - Seif El Nasr, Sarah A

AU - Smith, Vincent J

AU - Stylianou, Nicolas

AU - Walkingshaw Pass, Katie L M R

AU - White, Robert S

AU - al., et

PY - 2024/10/15

Y1 - 2024/10/15

N2 - Using proton–proton collision data corresponding to an integrated luminosity of 140 fb−1 collected by the CMS experiment at √s = 13 TeV, the Λ0b → J / ψΞ−K+ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the Λ0b→ψ(2S)Λ decay, is measured to be B(Λ0b → J / ψΞ−K+)/B(Λ0b→ψ(2S)Λ) =[3.38 ± 1.02 ± 0.61 ± 0.03] %, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in B(ψ(2S) → J / ψπ+π−) and B(Ξ− → Λπ−) .

AB - Using proton–proton collision data corresponding to an integrated luminosity of 140 fb−1 collected by the CMS experiment at √s = 13 TeV, the Λ0b → J / ψΞ−K+ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the Λ0b→ψ(2S)Λ decay, is measured to be B(Λ0b → J / ψΞ−K+)/B(Λ0b→ψ(2S)Λ) =[3.38 ± 1.02 ± 0.61 ± 0.03] %, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in B(ψ(2S) → J / ψπ+π−) and B(Ξ− → Λπ−) .

U2 - 10.1140/epjc/s10052-024-13114-9

DO - 10.1140/epjc/s10052-024-13114-9

M3 - Article (Academic Journal)

C2 - 39422214

SN - 1434-6044

VL - 84

JO - European Physical Journal C: Particles and Fields

JF - European Physical Journal C: Particles and Fields

IS - 10

M1 - 1062

ER -