TY - JOUR
T1 - Determination of Spin-Parity Quantum Numbers for the Narrow Structure near the p Λ ¯ Threshold in e+e- →pK- Λ ¯ + c. c.
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Adlarson, P.
AU - Aliberti, R.
AU - Kabana, S.
AU - The BESIII collaboration
N1 - Publisher Copyright:
© 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
PY - 2023/10/13
Y1 - 2023/10/13
N2 - A narrow structure in the pΛ¯ system near the mass threshold, named as X(2085), is observed in the process e+e-→pK-Λ¯ with a statistical significance greater than 20σ. Its spin and parity are determined for the first time to be JP=1+ in an amplitude analysis, with a statistical significance greater than 5σ over other quantum numbers (0-,1- and 2+). The pole positions of X(2085) are measured to be Mpole=(2084-2+4±9) MeV and Γpole=(58-3+4±25) MeV, where the first uncertainties are statistical and the second ones are systematic. The analysis is based on the study of the process e+e-→pK-Λ¯ and uses the data samples collected with the BESIII detector at the center-of-mass energies s=4.008, 4.178, 4.226, 4.258, 4.416, and 4.682 GeV with a total integrated luminosity of 8.35 fb-1.
AB - A narrow structure in the pΛ¯ system near the mass threshold, named as X(2085), is observed in the process e+e-→pK-Λ¯ with a statistical significance greater than 20σ. Its spin and parity are determined for the first time to be JP=1+ in an amplitude analysis, with a statistical significance greater than 5σ over other quantum numbers (0-,1- and 2+). The pole positions of X(2085) are measured to be Mpole=(2084-2+4±9) MeV and Γpole=(58-3+4±25) MeV, where the first uncertainties are statistical and the second ones are systematic. The analysis is based on the study of the process e+e-→pK-Λ¯ and uses the data samples collected with the BESIII detector at the center-of-mass energies s=4.008, 4.178, 4.226, 4.258, 4.416, and 4.682 GeV with a total integrated luminosity of 8.35 fb-1.
UR - https://www.scopus.com/pages/publications/85175271917
U2 - 10.1103/PhysRevLett.131.151901
DO - 10.1103/PhysRevLett.131.151901
M3 - Article
C2 - 37897776
AN - SCOPUS:85175271917
SN - 0031-9007
VL - 131
JO - Physical Review Letters
JF - Physical Review Letters
IS - 15
M1 - 151901
ER -