TY - JOUR
T1 - First Measurement of Polarizations in the Decay
AU - BESIII Collaboration
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Kalantar-Nayestanaki, N.
AU - Kappert, R.
AU - Kavatsyuk, M.
AU - Messchendorp, J.
AU - Rodin, V.
N1 - Funding Information:
The BESIII collaboration thanks the staff of BEPCII, the IHEP computing center, and the supercomputing center of USTC for their strong support. Authors are grateful to Dr. Fusheng Yu, Dr. Yuelong Shen, and Dr. Xiangwei Kang for their enlightening discussions. This work is supported in part by National Key Research and Development Program of China under Contracts No. 2020YFA0406400, 2020YFA0406300; National Natural Science Foundation of China (NSFC) under Contracts No. 11625523, 11635010, 11735014, 11822506, 11835012, 11935015, 11935016, 11935018, 11961141012, 12022510, 12035009, 12035013, 12061131003, 11605196, 11605198, 11705192, 11950410506; 64th batch of Postdoctoral Science Fund Foundation under contract No. 2018M642516; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U1732263, U1832207, U1832103, U2032111; CAS Key Research Program of Frontier Sciences under Contract No. QYZDJ-SSW-SLH040; 100 Talents Program of CAS; Institute of Nuclear and Particle Physics, Astronomy, and Cosmology (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; European Union Horizon 2020 research and innovation program under Contract No. Marie Sklodowska-Curie grant agreement No. 894790; German Research Foundation DFG under Contracts No. 443159800, Collaborative Research Center CRC 1044, FOR 2359, FOR 2359, GRK 214; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; Olle Engkvist Foundation under Contract No. 200-0605; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157; The Royal Society, UK under Contracts No. DH140054, DH160214; The Swedish Research Council; U.S. Department of Energy under Contracts No. DE-FG02-05ER41374, DE-SC-0012069.
Publisher Copyright:
Published by the American Physical Society
PY - 2022/1/7
Y1 - 2022/1/7
N2 - Using a data sample corresponding to an integrated luminosity of 2.93 fb-1 collected at a center-of-mass energy s=3.773 GeV by the BESIII detector, the decay D0 is observed for the first time. The branching fraction is measured to be (6.48±0.96±0.40)×10-4 with a significance of 6.3s, where the first and second uncertainties are statistical and systematic, respectively. An angular analysis reveals that the ? and ? mesons from the D0 decay are transversely polarized. The 95% confidence level upper limit on longitudinal polarization fraction is set to be less than 0.24, which is inconsistent with current theoretical expectations and challenges our understanding of the underlying dynamics in charm meson decays.
AB - Using a data sample corresponding to an integrated luminosity of 2.93 fb-1 collected at a center-of-mass energy s=3.773 GeV by the BESIII detector, the decay D0 is observed for the first time. The branching fraction is measured to be (6.48±0.96±0.40)×10-4 with a significance of 6.3s, where the first and second uncertainties are statistical and systematic, respectively. An angular analysis reveals that the ? and ? mesons from the D0 decay are transversely polarized. The 95% confidence level upper limit on longitudinal polarization fraction is set to be less than 0.24, which is inconsistent with current theoretical expectations and challenges our understanding of the underlying dynamics in charm meson decays.
UR - http://www.scopus.com/inward/record.url?scp=85123176715&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.128.011803
DO - 10.1103/PhysRevLett.128.011803
M3 - Article
C2 - 35061485
SN - 0031-9007
VL - 128
JO - Physical Review Letters
JF - Physical Review Letters
IS - 1
M1 - 011803
ER -