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Observation of a J/...
Observation of a J/ΨΛ Resonance Consistent with a Strange Pentaquark Candidate in B- → J/ψΛ(p)over-bar Decays
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- Aaij, R. (författare)
- Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands
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- Adlarson, Patrik (författare)
- Uppsala universitet,Kärnfysik,Univ Glasgow, Sch Phys & Astron, Glasgow, Lanark, Scotland
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- Eklund, Lars (författare)
- Uppsala universitet,Kärnfysik,Univ Glasgow, Sch Phys & Astron, Glasgow, Lanark, Scotland
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- Kupsc, Andrzej (författare)
- Uppsala universitet,Kärnfysik,Univ Glasgow, Sch Phys & Astron, Glasgow, Lanark, Scotland
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- Zunica, G. (författare)
- Univ Manchester, Dept Phys & Astron, Manchester, Lancs, England
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(creator_code:org_t)
- American Physical Society, 2023
- 2023
- Engelska.
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Ingår i: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 131:3
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- An amplitude analysis of B- -> J/psi Lambda(p) over bar decays is performed using 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/psi Lambda 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 +/- 0.7 +/- 0.4 MeV and 7.0 +/- 1.2 +/- 1.3 MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Because of the small Q-value of the reaction, the most precise single measurement of the B- mass to date, 5279.44 +/- 0.05 +/- 0.07 MeV, is obtained.
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
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