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Search for Lepton-Flavor-Violating Decay Modes 𝐵0 →𝐾$$^0_𝑆$$⁢𝜏±⁢ℓ∓ with Hadronic 𝐵 Tagging at Belle and Belle II

Journal Article · · Physical Review Letters
DOI:https://doi.org/10.1103/yzvh-v3hm· OSTI ID:3006437
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We present the first search for the lepton-flavor-violating decay modes 𝐵0 →𝐾$$^0_𝑆$$⁢𝜏±⁢ℓ∓ (ℓ=𝜇,𝑒) using the 711 and 365 fb−1 data samples recorded by the Belle and Belle II detectors, respectively. We use a hadronic 𝐵-tagging technique to fully reconstruct a 𝐵 meson and search for signal decays in the system recoiling against the tagged meson, considering 𝜏 decays to either light leptons, one charged hadron, or one charged hadron and a neutral pion. We find no evidence for 𝐵0 →𝐾$$^0_𝑆$$⁢𝜏±⁢ℓ∓ decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8,3.6] ×10−5.
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:
DP200101792
DP210101900
DP210102831
DE220100462
LE210100098
LE230100085
P 34529
J 4731
J 4625
M 3153
947006
267104
884719
819127
2022YFA1601903
11575017
11761141009
11705209
11975076
12135005
12150004
12161141008
12175041
12475093
ZR2022JQ02
22-18469S
246122
PIEF-GA-2013-622527
700525
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
S-0256-1438
S-0280-1439
RSPD2024R873
PID2022-136510NB-C33
RYC2020-029875-I
CIDEGENT/2018/020
2021.0174
2021.0299
2020.02/0257
PHY-1913789
PHY-2111604
NVCC.02/24-25
DL0000.05/21-23
23LCG-1C011
FOINS-296
CB-221329
CB-236394
CB-254409
CB-180023
SEP-CINVESTAV
237
J1-9124
P1-0135
OSTI ID:
3006437
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 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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