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Title: Measurement of the I = 1 / 2 K π S -wave amplitude from Dalitz plot analyses of η c K K ¯ π in two-photon interactions

Journal Article · · Physical Review D
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We study the processes γγ→KS0K±πℓ and γγ→K+K-π0 using a data sample of 519 fb-1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e+e- collider at center-of-mass energies at and near the Υ(nS) (n=2, 3, 4) resonances. We observe ηc decays to both final states and perform Dalitz plot analyses using a model-independent partial wave analysis technique. This allows a model-independent measurement of the mass-dependence of the I=1/2 Kπ S-wave amplitude and phase. A comparison between the present measurement and those from previous experiments indicates similar behavior for the phase up to a mass of 1.5 GeV/c2. In contrast, the amplitudes show very marked differences. The data require the presence of a new a0(1950) resonance with parameters m=1931±14±22 MeV/c2 and Γ=271±22±29 MeV.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
The BaBar Collaboration
Grant/Contract Number:
AC02-76SF00515; AC05-06OR23177; AC02-05CH11231
OSTI ID:
1234960
Alternate ID(s):
OSTI ID: 1235791; OSTI ID: 1393012
Report Number(s):
SLAC-PUB-16422; PRVDAQ; arXiv:1511.02310
Journal Information:
Physical Review D, Vol. 93, Issue 1; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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