期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.181802
关键词
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资金
- INFN
- Science Committee of the Republic of Armenia [20TTCG-1C010]
- Australian Research Council [DP180102629, DP170102389, DP170102204, DP150103061, FT130100303, FT130100018, FT120100745]
- Austrian Federal Ministry of Education, Science and Research, Austrian Science Fund [P 31361-N36]
- Horizon 2020 ERC [947006]
- Natural Sciences and Engineering Research Council of Canada
- Chinese Academy of Sciences [QYZDJ-SSW-SLH011]
- National Natural Science Foundation of China [11521505, 11575017, 11675166, 11761141009, 11705209, 11975076]
- LiaoNing Revitalization Talents Program [XLYC1807135]
- Shanghai Municipal Science and Technology Committee [19ZR1403000]
- Shanghai Pujiang Program [18PJ1401000]
- CAS Center for Excellence in Particle Physics (CCEPP)
- Ministry of Education, Youth, and Sports of the Czech Republic [LTT17020]
- Charles University [SVV260448]
- GAUK [404316]
- European Research Council, Seventh Framework [PIEF-GA-2013-622527, 267104, 884719]
- Horizon 2020 ERC-Consolidator [819127]
- Horizon 2020 Marie Sklodowska-Curie Grant [700525, 822070]
- L'Institut National de Physique Nucl 'the Czech Republic [IN2P3]
- BMBF
- DFG
- AvH Foundation (Germany)
- Department of Atomic Energy [RTI 4002]
- Department of Science and Technology (India)
- Israel Science Foundation [2476/17]
- U.S.-Israel Binational Science Foundation [2016113]
- Israel Ministry of Science [3-16543]
- Istituto Nazionale di Fisica Nucleare [BELLE2]
- Japan Society for the Promotion of Science [16H03968, 16H03993, 16H06492, 16K05323, 17H01133, 17H05405, 18K03621, 18H03710, 18H05226, 19H00682, 26220706, 26400255]
- National Institute of Informatics, and Science Information NETwork 5 (SINET5)
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan
- National Research Foundation (NRF) of Korea [2016R1D1A1B01010135, 2016R1D1A1B02012900, 2018R1A2B3003643, 2018R1A6A1A06024970, 2018R1D1A1B07047294, 2019K1A3A7A09033840, 2019R1I1A3A01058933]
- Universiti Malaya RU grant
- Akademi Sains Malaysia
- Ministry of Education Malaysia
- Frontiers of Science Program [FOINS-296, CB-221329, CB-236394, CB-254409, CB-180023, 237]
- Polish Ministry of Science and Higher Education
- National Science Center
- Ministry of Science and Higher Education of the Russian Federation [14, W03.31.0026]
- HSE University Basic Research Program, Moscow
- University of Tabuk research [S-0256-1438, S-0280-1439]
- Slovenian Research Agency [J1-9124, P1-0135]
- Agencia Estatal de Investigacion, Spain [FPA2014-55613-P, FPA2017-84445-P, CIDEGENT/2018/020]
- Generalitat Valenciana
- Ministry of Science and Technology [MOST106-2112-M-002-005-MY3, MOST107-2119-M-002-035-MY3]
- Ministry of Education (Taiwan)
- Thailand Center of Excellence in Physics
- Ministry of Education and Science of Ukraine
- U.S. National Science Foundation [PHY-1807007, PHY-1913789]
- U.S. Department of Energy [DE-AC06-76RLO1830, DE-SC0007983, DE-SC0009824, DE-SC0009973, DE-SC0010073, DE-SC0010118, DE-SC0010504, DE-SC0011784, DE-SC0012704, DE-SC0021274]
- Vietnam Academy of Science and Technology (VAST) [DL0000.05/21-23]
- European Research Council (ERC) [819127] Funding Source: European Research Council (ERC)
- Australian Research Council [FT120100745] Funding Source: Australian Research Council
- Grants-in-Aid for Scientific Research [16K05323, 16H03968, 17H05405, 16H03993, 18K03621, 18H05226, 19H00682] Funding Source: KAKEN
- U.S. Department of Energy (DOE) [DE-SC0021274, DE-SC0009824, DE-SC0010073, DE-SC0011784] Funding Source: U.S. Department of Energy (DOE)
The experiment used a novel measurement approach to suppress background and improve signal efficiency, but did not observe a significant signal for the B+ -> K+nu(nu) over bar decay. An upper limit on the branching fraction of 4.1 x 10(-5) was set at the 90% confidence level.
A search for the flavor-changing neutral-current decay B+ -> K+nu(nu) over bar is performed at the Belle II experiment at the SuperKEKB asymmetric energy electron-positron collider. The data sample corresponds to an integrated luminosity of 63 fb(-1) collected at the Upsilon(4S) resonance and a sample of 9 fb(-1) collected at an energy 60 MeV below the resonance. Because the measurable decay signature involves only a single charged kaon, a novel measurement approach is used that exploits not only the properties of the B+ -> K+nu(nu) over bar decay, but also the inclusive properties of the other B meson in the Upsilon(4S) -> B (B) over bar event, to suppress the background from other B meson decays and light-quark pair production. This inclusive tagging approach offers a higher signal efficiency compared to previous searches. No significant signal is observed. An upper limit on the branching fraction of B+ -> K+nu(nu) over bar of 4.1 x 10(-5) is set at the 90% confidence level.
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