TY - JOUR

T1 - Search for a bound state of Λ푐⁢¯Σ푐 near threshold

AU - BESIII Collaboration

AU - Ачасов, Михаил Николаевич

AU - Мучной, Николай Юрьевич

AU - Николаев, Иван Борисович

N1 - The BESIII Collaboration thanks the staff of BEPCII [36] and the IHEP computing center for their strong support. This work is supported in part by National Key R&D Program of China under Contracts No. 2023YFA1606000, No. 2023YFA1606704; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11935015, No. 11935016, No. 11935018, No. 12025502, No. 12035009, No. 12035013, No. 12061131003, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 12221005, No. 12225509, No. 12235017, and No. 12361141819; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; CAS under Contract No. YSBR-101; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; German Research Foundation DFG under Contract No. FOR5327; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts No. 2021.0174, No. 2021.0299; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Research Foundation of Korea under Contract No. NRF-2022R1A2C1092335; National Science and Technology fund of Mongolia; Polish National Science Centre under Contract No. 2024/53/B/ST2/00975; STFC (United Kingdom); Swedish Research Council under Contract No. 2019.04595; U.S. Department of Energy under Contract No. DE-FG02-05ER41374.

PY - 2025/12/26

Y1 - 2025/12/26

N2 - We search for a possible Λ푐⁢¯Σ푐 bound state, denoted as 퐻±푐, via the 푒+⁢푒− →휋+⁢휋−⁢Λ+푐¯Λ−푐 process for the first time. This analysis utilizes 207.8 and 159.3  pb−1 of 푒+⁢푒− annihilation data at the center-of-mass energies of 4918.02 and 4950.93 MeV, respectively, collected with the BESIII detector at the BEPCII collider. No statistically significant signal is observed. The upper limits of the product of Born cross section and branching fraction 휎⁡(푒+⁢푒− →휋+⁢퐻−푐 +c.c.) ×ℬ⁡(퐻−푐 →휋−⁢Λ+푐¯Λ−푐) at a 90% confidence level are reported at each energy point and for various 퐻푐 mass hypotheses (4715, 4720, 4725, 4730, and 4735  MeV/푐2) and widths (5, 10, or 20 MeV), with the upper limits ranging from 1.1 pb to 6.4 pb.

AB - We search for a possible Λ푐⁢¯Σ푐 bound state, denoted as 퐻±푐, via the 푒+⁢푒− →휋+⁢휋−⁢Λ+푐¯Λ−푐 process for the first time. This analysis utilizes 207.8 and 159.3  pb−1 of 푒+⁢푒− annihilation data at the center-of-mass energies of 4918.02 and 4950.93 MeV, respectively, collected with the BESIII detector at the BEPCII collider. No statistically significant signal is observed. The upper limits of the product of Born cross section and branching fraction 휎⁡(푒+⁢푒− →휋+⁢퐻−푐 +c.c.) ×ℬ⁡(퐻−푐 →휋−⁢Λ+푐¯Λ−푐) at a 90% confidence level are reported at each energy point and for various 퐻푐 mass hypotheses (4715, 4720, 4725, 4730, and 4735  MeV/푐2) and widths (5, 10, or 20 MeV), with the upper limits ranging from 1.1 pb to 6.4 pb.

KW - Particle interactions

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:001671979400001

U2 - 10.1103/jv3m-h997

DO - 10.1103/jv3m-h997

M3 - Article

VL - 112

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 11

M1 - 114044

ER -