Abstract
We report an amplitude analysis and branching fraction measurement of Ds+→K+K−π+ decay using a data sample of 3.19 fb−1 recorded with BESIII detector at a center-of-mass energy of 4.178 GeV. We perform a model-independent partial wave analysis in the low K+K− mass region to determine the K+K− S-wave line shape, followed by an amplitude analysis of our very pure high-statistics sample. With the detection efficiency based on the amplitude analysis results, the absolute branching fraction is measured to be B(Ds+→K+K−π+)=(5.47±0.08stat±0.13sys)%.2 MoreReceived 19 November 2020Accepted 2 July 2021DOI:https://doi.org/10.1103/PhysRevD.104.012016Published 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 interactionsParticles & Fields
Highlights
The decay Dþs → KþK−πþ is widely used as a reference mode in DÆs analyses because of its large branching fraction (BF) and low background contamination
We report an amplitude analysis and branching fraction measurement of Dþs → KþK−πþ decay using a data sample of 3.19 fb−1 recorded with BESIII detector at a center-of-mass energy of 4.178 GeV
The one with a uniform distribution of Dþs → KþK−πþ decays over the phase space (PHSP) is called “PHSP Monte Carlo (MC)." In the second sample, called “signal MC”, the Dþs → KþK−πþ decay is generated according to the model obtained from the amplitude analysis presented in this paper
Summary
The decay Dþs → KþK−πþ is widely used as a reference mode in DÆs analyses because of its large branching fraction (BF) and low background contamination. Dalitz plot analyses of the Dþs → KþK−πþ decay have been performed by the E687 [2], CLEO [3] and BABAR [4]. In this paper we report an amplitude analysis and BF measurement of Dþs → KþK−πþ (the inclusion of charge conjugates is implied) using a 3.19 fb−1 data sample collected with the BESIII detector at a center-of-mass energy (ECMS) of 4.178 GeV. At this energy, the cross section for the DÃsÆD∓s final state in eþe− annihilations is 1 order magnitude larger than that for Dþs D−s [6].
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