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Measurement of the 𝐷0β†’πΎβˆ’β’πœ‹+⁒𝑒+β’π‘’βˆ’ branching fraction and search for 𝐷0 β†’ πœ‹+β’πœ‹βˆ’β’π‘’+β’π‘’βˆ’ and 𝐷0 →𝐾+β’πΎβˆ’β’π‘’+β’π‘’βˆ’ decays at Belle

Journal Article · · Physical Review. D.
DOI:https://doi.org/10.1103/mkx8-cl23· OSTI ID:3007252
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We present a study of the rare charm meson decays 𝐷0 →𝐾+β’πΎβˆ’β’π‘’+β’π‘’βˆ’, πœ‹+β’πœ‹βˆ’β’π‘’+β’π‘’βˆ’, and πΎβˆ’β’πœ‹+⁒𝑒+β’π‘’βˆ’ using a 942  fbβˆ’1 dataset collected by the Belle detector at the KEKB asymmetric-energy 𝑒+β’π‘’βˆ’ collider. We identify 𝐷0 candidates via the charge of the pion from 𝐷*+ →𝐷0β’πœ‹+ decays and normalize the branching fractions to 𝐷0 β†’ πΎβˆ’β’πœ‹+β’πœ‹βˆ’β’πœ‹+ decays. The branching fraction for decay 𝐷0 β†’ πΎβˆ’β’πœ‹+⁒𝑒+β’π‘’βˆ’ is measured to be (39.6 Β± 4.5 (stat) Β± 2.9 (syst)) Γ— 10βˆ’7, with the dielectron mass in the 𝜌/πœ” mass region 675 < π‘šπ‘’β’π‘’ < 875  MeV/⁒𝑐2. We also search for 𝐷0 β†’ β„Žβˆ’β‘β„Ž(β€²)+⁑𝑒+β’π‘’βˆ’ (β„Ž(β€²) = 𝐾, πœ‹) decays with the dielectron mass near the πœ‚ and πœ™ resonances, and away from these resonances for the 𝐾+β’πΎβˆ’β’π‘’+β’π‘’βˆ’ and πœ‹+β’πœ‹βˆ’β’π‘’+β’π‘’βˆ’ modes. For these modes, we find no significant signals and set 90% confidence level upper limits on their branching fractions at the π’ͺ⁑(10βˆ’7) level.
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
10.55776/P34529
10.55776/J4731
10.55776/J4625
10.55776/M3153
10.55776/PAT1836324
947006
267104
884719
819127
2024YFA1610503
2024YFA1610504
11575017
11761141009
11705209
11975076
12135005
12150004
12161141008
12405099
12475093
12175041
ZR2022JQ02
22-18469S
CZ.02.01.01/00/22_008/0004632
246122
PIEF-GA-2013-622527
700525
101026516
822070
23-CE31-0018
RTI 4002
UPES/R&D-SEED-INFRA/17052023/01
UPES/R&D-SOE/20062022/06
2476/17
2016113
3-16543
16H03968
16H03993
16H06492
16K05323
17H01133
17H05405
18K03621
18H03710
18H05226
19H00682
20H05850
20H05858
22H00144
22K14056
22K21347
23H05433
26220706
26400255
2021R1-F1A-1064008
2022R1-A2C-1003993
2022R1-A2C-1092335
RS-2016-NR017151
RS-2018-NR031074
RS-2021-NR060129
RS-2023-00208693
RS-2024-00354342
RS-2025-02219521
K25L2M2C3
237
S-0256-1438
S-0280-1439
J1-50010
P1-0135
PID2022-136510NB-C33
RYC2020-029875-I
CIDEGENT/2018/020
2021.0174
2021.0299
2023.0315
2020.02/0257
PHY-1913789
PHY-2111604
NVCC.05.02/25-25
DL0000.05/26-27
23LCG-1C011
FOINS-296
CB-221329
CB-236394
CB-254409

CB-180023
OSTI ID:
3007252
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 7 Vol. 112; ISSN 2470-0029; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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branching fraction
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