Periodic interference structures in the timelike proton form factor - INSPIRE

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Periodic interference structures in the timelike proton form factor

Andrea Bianconi
(
- Brescia U. and
- INFN, Brescia
)
,
Egle Tomasi-Gustafsson
(
- IRFU, SPhN, Saclay
)

Mar 7, 2015

5 pages

Published in:

Phys.Rev.Lett. 114 (2015) 23, 232301

Published: Jun 12, 2015

e-Print:

1503.02140 [nucl-th]

DOI:

10.1103/PhysRevLett.114.232301

View in:

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Abstract: (APS)

An intriguing and elusive feature of the timelike hadron form factor is the possible presence of an imaginary part associated to rescattering processes. We find evidence of that in the recent and precise data on the proton timelike form factor measured by the BABAR Collaboration. By plotting these data as a function of the 3-momentum of the relative motion of the final proton and antiproton, a systematic sinusoidal modulation is highlighted in the near-threshold region. Our analysis attributes this pattern to rescattering processes at a relative distance of 0.7–1.5 fm between the centers of the forming hadrons. This distance implies a large fraction of inelastic processes in p¯p interactions, and a large imaginary part in the related e+e-→p¯p reaction because of unitarity.

Note:

5 pages 3 figures - Discussion modified. To appear in Phys Rev Letters

13.75.-n
13.40.Gp
14.20.-c
p: form factor
hadron: form factor
interference
modulation
structure
unitarity
anti-p

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