Abstract
Using 2.93 fb−1 of e+e− collision data taken at a center-of-mass energy of 3.773 GeV by the BESIII detector at the BEPCII, we measure the branching fractions of the singly Cabibbo-suppressed decays D→ωππ to be B(D0→ωπ+π−)=(1.33±0.16±0.12)×10−3 and B(D+→ωπ+π0)=(3.87±0.83±0.25)×10−3, where the first uncertainties are statistical and the second ones systematic. The statistical significances are 12.9σ and 7.7σ, respectively. The precision of B(D0→ωπ+π−) is improved by a factor of 2.1 over prior measurements, and B(D+→ωπ+π0) is measured for the first time. No significant signal for D0→ωπ0π0 is observed, and the upper limit on the branching fraction is B(D0→ωπ0π0)<1.10×10−3 at the 90% confidence level. The branching fractions of D→ηππ are also measured and consistent with existing results.Received 6 July 2020Accepted 20 August 2020DOI:https://doi.org/10.1103/PhysRevD.102.052003Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasParticle decaysParticle interactionsParticles & Fields
Highlights
The study of multibody hadronic decays of charmed mesons is important to understand the decay dynamics of both strong and weak interactions
We present measurements of the absolute branching fractions (BFs) of the singly Cabibbo-suppressed (SCS) decays D → ωππ with the “double tag” (DT) technique pioneered by the MARK-III Collaboration [8]
Since the significance of D0 → ω=ηπ0π0 is less than 1σ, we compute upper limits on the BFs for these two decays at the 90% confidence level (C.L.) by integrating their likelihood versus BF curves from zero to 90% of the total curve
Summary
The study of multibody hadronic decays of charmed mesons is important to understand the decay dynamics of both strong and weak interactions. The BFs of many multibody hadronic decays, especially for singly Cabibbo-suppressed (SCS) or doubly Cabibbo-suppressed (DCS) decays of D mesons, are still either unknown or imprecise due to low decay rates or huge backgrounds. Precise measurements of these decays are desirable in several areas. We present measurements of the absolute BFs of the SCS decays D → ωππ with the “double tag” (DT) technique pioneered by the MARK-III Collaboration [8] The advantage of this technique is to reduce the combinatorial backgrounds from non-DDdecays with a cost of loss of the statistics. Throughout the paper, the charge conjugate modes are always implied, unless explicitly stated
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