Actions for Proton Form Factors Measurements in the Time-Like Region [electronic resource].

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Proton Form Factors Measurements in the Time-Like Region [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2007.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
10 pages : digital, PDF file
Additional Creators
Stanford Linear Accelerator Center, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
I present an overview of the measurement of the proton form factors in the time-like region. BABAR has recently measured with great accuracy the e⁺e⁻ → p{bar p} reaction from production threshold up to an energy of ≈ 4.5 GeV, finding evidence for a ratio of the electric to magnetic form factor greater than unity, contrary to expectation. In agreement with previous measurements, BABAR confirmed the steep rise of the magnetic form factor close to the p{bar p} mass threshold, suggesting the possible presence of an under-threshold N{bar N} vector state. These and other open questions related to the nucleon form factors both in the time-like and space-like region, wait for more data with different experimental techniques to be possibly solved.
Report Numbers
E 1.99:slac-pub-12901
slac-pub-12901
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Note
Published through SciTech Connect.
10/22/2007.
"slac-pub-12901"
J.Phys.Conf.Ser.69:012014,2007
Prepared for 2nd Meeting of the APS Topical Group on Hadronic Physics, Nashville, Tennessee, 22-24 Oct 2006.
Anulli, F.
Funding Information
AC02-76SF00515
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