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Title: Measurement of the e + e - π + π - π 0 π 0 cross section using initial-state radiation at BABAR

Journal Article · · Physical Review D
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The process e+e-→π+π-2π0γ is investigated by means of the initial-state radiation technique, where a photon is emitted from the incoming electron or positron. Using 454.3 fb-1 of data collected around a center-of-mass energy of s=10.58 GeV by the BABAR experiment at SLAC, approximately 150000 signal events are obtained. The corresponding nonradiative cross section is measured with a relative uncertainty of 3.6% in the energy region around 1.5 GeV, surpassing all existing measurements in precision. Using this new result, the channel's contribution to the leading order hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon is calculated as (gμπ+π-2π0-2)/2=(17.9±0.1stat±0.6syst)×10-10 in the energy range 0.85 GeV < ECM < 1.8 GeV. In the same energy range, the impact on the running of the fine-structure constant at the Z0-pole is determined as Δαπ+π-2π0(MZ2)=(4.44±0.02stat±0.14syst)×10-4. Furthermore, intermediate resonances are studied and especially the cross section of the process e+e-→ωπ0→π+π-2π0 is measured.

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)
Contributing Organization:
BABAR Collaboration
Grant/Contract Number:
AC02-76SF00515; AC02-05CH11231
OSTI ID:
1418011
Alternate ID(s):
OSTI ID: 1410588; OSTI ID: 1420131
Report Number(s):
SLAC-PUB-17147; BABAR-PUB-17/002; PRVDAQ; TRN: US1801232
Journal Information:
Physical Review D, Vol. 96, Issue 9; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (4)

Magnetic moment of the ρ meson in instant-form relativistic quantum mechanics journal February 2018
Muon g 2 and α ( M Z 2 ) : A new data-based analysis journal June 2018
Coupling QCD-Scale Axionlike Particles to Gluons journal July 2019
Coupling QCD-scale axion-like particles to gluons text January 2018

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