Search for B0 → K*0𝜏+⁢𝜏− Decays at the Belle II Experiment

Adachi, I.; Adamczyk, K.; Aggarwal, L.; Ahmed, H.; Aihara, H.; Akopov, N.; Alhakami, M.; Aloisio, A.; Althubiti, N.; Angelsmark, M.; Anh Ky, N.; Asner, D. M.; Atmacan, H.; Aushev, V.; Aversano, M.; Ayad, R.; Babu, V.; Bae, H.; Baghel, N. K.; Bahinipati, S.; Bambade, P.; Banerjee, Sw.; Bansal, S.; Barrett, M.; Bartl, M.; Baudot, J.; Baur, A.; Beaubien, A.; Becherer, F.; Becker, J.; Bennett, J. V.; Bernlochner, F. U.; Bertacchi, V.; Bertemes, M.; Bertholet, E.; Bessner, M.; Bettarini, S.; Bhardwaj, V.; Bhuyan, B.; Bianchi, F.; Bilka, T.; Biswas, D.; Bobrov, A.; Bodrov, D.; Bolz, A.; Bondar, A.; Boschetti, A.; Bozek, A.; Bračko, M.; Branchini, P.; Brenny, N.; Briere, R. A.; Browder, T. E.; Budano, A.; Bussino, S.; Campagna, Q.; Campajola, M.; Cao, L.; Casarosa, G.; Cecchi, C.; Cerasoli, J.; Chang, M.-C.; Chang, P.; Cheaib, R.; Cheema, P.; Cheon, B. G.; Chilikin, K.; Chin, J.; Chirapatpimol, K.; Cho, H.-E.; Cho, K.; Cho, S.-J.; Choi, S.-K.; Choudhury, S.; Cochran, J.; Consigny, I.; Corona, L.; 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doi:10.1103/v1q3-9dy8

Search for B⁰ → K^*0𝜏⁺⁢𝜏⁻ Decays at the Belle II Experiment

Journal Article · Mon Oct 06 00:00:00 EDT 2025 · Physical Review Letters

DOI:https://doi.org/10.1103/v1q3-9dy8· OSTI ID:3006443

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We present a search for the rare flavor-changing neutral-current decay 𝐵⁰→𝐾^*0⁢𝜏⁺⁢𝜏⁻ with data collected by the Belle II experiment at the SuperKEKB electron-positron collider. The analysis uses a 365 fb⁻¹ data sample recorded at the center-of-mass energy of the ϒ⁡(4⁢𝑆) resonance. One of the 𝐵 mesons produced in the ϒ⁡(4⁢𝑆)→𝐵⁰$$⁢\overline{𝐵}$$⁰ process is fully reconstructed in a hadronic decay mode, while its companion 𝐵 meson is required to decay into a 𝐾^*0 and two 𝜏 leptons of opposite charge. The 𝜏 leptons are reconstructed in final states with a single electron, muon, charged pion or charged 𝜌 meson, and additional neutrinos. We set an upper limit on the branching fraction of ℬ⁡(𝐵⁰→𝐾^*0⁢𝜏⁺⁢𝜏⁻)<1.8×10⁻³ at the 90% confidence level, which is the most stringent constraint reported to date.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Hawaii, Honolulu, HI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC06-76RL01830; SC0007983; SC0009824; SC0009973; SC0010007; SC0010073; SC0010118; SC0010504; SC0011784; SC0012704; SC0019230; SC0021274; SC0021616; SC0022350; SC0023470

Other Award/Contract Number:: 23LCG-1C011
DP200101792
DP210101900
DP210102831
DE220100462
LE210100098
LE230100085
947006
2022YFA1601903
11575017
11761141009
11705209
11975076
12135005
12150004
12161141008
12475093
12175041
ZR2022JQ02
22-18469S
246122
PIEF-GA-2013-622527
267104
884719
819127
700525 “NIOBE”
101026516
822070
ANR-21-CE31-0009
RTI 4002
UPES/R&D-SEED-INFRA/17052023/01
UPES/R&D-SOE/20062022/06
2476/17
2016113
3-16543
BELLE2
16H03968
16H03993
16H06492
16K05323
17H01133
17H05405
18K03621
18H03710
18H05226
19H00682
20H05850
20H05858
22H00144
22K14056
22K21347
23H05433
26220706
26400255
2016R1-D1A1B-02012900
2018R1-A6A1A-06024970
2021R1-A6A1A-03043957
2021R1-F1A-1060423
2021R1-F1A-1064008
2022R1-A2C-1003993
2022R1-A2C-1092335
RS-2023-00208693
RS-2024-00354342
RS-2022-00197659
K24L2M1C4
237
S-0256-1438
S-0280-1439
RSPD2025R873
J1-9124
P1-0135
RYC2020-029875-I
CIDEGENT/2018/020
2020.02/0257
PHY-1913789
PHY-2111604
NVCC.05.12/22-23
DL0000.02/24-25
FOINS-296
CB-221329
CB-236394
CB-254409
CB-180023

OSTI ID:: 3006443

Alternate ID(s):: OSTI ID: 3006444

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 135; ISSN 0031-9007; ISSN 1079-7114

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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