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Abstract / Description of output
An amplitude analysis of the π΅+βπ·+π β’π·βπ β’πΎ+ decay is carried out to study for the first time its intermediate resonant contributions, using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. A near-threshold peaking structure, referred to as πβ‘(3960), is observed in the π·+π β’π·βπ invariant-mass spectrum with significance greater than 12 standard deviations. The mass, width, and the quantum numbers of the structure are measured to be 3956Β±5Β±10ββMeV, 43Β±13Β±8ββMeV, and π½πβ’πΆ=0++, respectively, where the first uncertainties are statistical and the second systematic. The properties of the new structure are consistent with recent theoretical predictions for a state composed of πβ’
Β―πβ’π β’Β―π quarks. Evidence for an additional structure is found around 4140 MeV in the π·+
π β’π·βπ invariant mass, which might be caused either by a new resonance with the 0++ assignment or by a π½/πβ’πβπ·+π β’π·βπ coupled-channel effect.
Β―πβ’π β’Β―π quarks. Evidence for an additional structure is found around 4140 MeV in the π·+
π β’π·βπ invariant mass, which might be caused either by a new resonance with the 0++ assignment or by a π½/πβ’πβπ·+π β’π·βπ coupled-channel effect.
| Original language | English |
|---|---|
| Article number | 071901 |
| Pages (from-to) | 1-12 |
| Number of pages | 12 |
| Journal | Physical Review Letters |
| Volume | 131 |
| Issue number | 7 |
| Early online date | 14 Aug 2023 |
| DOIs | |
| Publication status | Published - 18 Aug 2023 |
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LHCb Ugrade: Beyond the Energy Frontier
Playfer, S., Clarke, P., Eisenhardt, S., Muheim, F. & Needham, M.
1/10/14 β 31/03/21
Project: Research