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Title: Measurement of cos 2 β in B 0 D ( * ) h 0 with D K S 0 π + π decays by a combined time-dependent Dalitz plot analysis of BaBar and Belle data

Journal Article · · Physical Review. D.
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We report measurements of sin 2 β and cos 2 β using a time-dependent Dalitz plot analysis of B 0 D ( * ) h 0 with D K S 0 π + π - decays, where the light unflavored and neutral hadron h 0 is a π 0 , η , or ω meson. The analysis uses a combination of the final data sets of the BaBar and Belle experiments containing 471 × 10 6 and 772 × 10 6 B B ¯ pairs collected at the Υ ( 4 S ) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure sin 2 β = 0.80 ± 0.14 ( stat ) ± 0.06 ( syst ) ± 0.03 ( model ) and cos 2 β = 0.91 ± 0.22 ( stat ) ± 0.09 ( syst ) ± 0.07 ( model ) . The result for the direct measurement of the angle is β = ( 22.5 ± 4.4 ( stat ) ± 1.2 ( syst ) ± 0.6 ( model ) ) ° . The last quoted uncertainties are due to the composition of the D 0 K S 0 π + π - decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics e + e - c c ¯ data sample as part of this analysis. We find the first evidence for cos 2 β > 0 at the level of 3.7 standard deviations. The measurement excludes the trigonometric multifold solution π / 2 - β = ( 68.1 ± 0.7 ) ° at the level of 7.3 standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of β = 0 ° is ruled out at the level of 5.1 standard deviations, and thus C P violation is observed in B 0 D ( * ) h 0 decays. The measurement assumes no direct C P violation in B 0 D ( * ) h 0 decays.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); KEK - High Energy Accelerator Research Organization; Ministry of Education, Culture, Sports, Science and Technology; National Science Foundation (NSF)
Contributing Organization:
BaBar Collaboration; Belle Collaboration; BABAR Collaboration
Grant/Contract Number:
SC0012704; AC02-05CH11231; AC05-76RL01830; P 26794-N20; 10575109; 10775142; 10875115; 11175187; 11475187; 11521505; 11575017; LTT17020; 2014R1A2A2A01005286; 2015R1A2A2A01003280; 2015H1A2A1033649; 2016R1D1A1B01010135; 2016K1A3A7A09005603; 2016R1D1A1B02012900; SC0009973
OSTI ID:
1488883
Alternate ID(s):
OSTI ID: 1491124; OSTI ID: 1550845; OSTI ID: 1557861; OSTI ID: 1593882
Report Number(s):
BNL-210863-2019-JAAM; PRVDAQ; 112012
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Vol. 98 Journal Issue: 11; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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