Pointlike Baryons?
| dc.creator | Baldini, R. | |
| dc.creator | Pacetti, S. | |
| dc.creator | Zallo, A. | |
| dc.date | 2008-12-17 | |
| dc.date | 2009-01-19 | |
| dc.date.accessioned | 2026-07-07T12:30:56Z | |
| dc.date.available | 2026-07-07T12:30:56Z | |
| dc.description | A peculiar feature, observed in the BaBar data on e+e- -> baryon-antibaryon cross sections, is the non-vanishing cross section at threshold for all these processes. This is the expectation due to the Coulomb enhancement factor acting on a charged fermion pair. Remarkably, in the case of e+e- -> p-pbar it is found that Coulomb final state interactions largely dominate the cross section at threshold and it turns out a form factor |G(4Mp^2)|~1, as a point-like fermion. Also in the case of e+e- -> Lambda_c-antiLambda_c, as recently measured by Belle for the first time, a point-like behavior is suggested for the charmed charged baryon, being the Lambda_c form factor at threshold |G|~1, even if within a large error. In the case of neutral strange baryons the non-vanishing cross section at threshold is interpreted as a remnant of quark pair Coulomb interaction before the hadronization, taking into account the asymmetry between attractive and repulsive Coulomb factors. Besides strange baryon cross sections are successfully compared to U-spin invariance relationships. | |
| dc.description | 10 pages, 9 figures | |
| dc.identifier | https://arxiv.org/abs/0812.3283 | |
| dc.identifier | http://arxiv.org/abs/0812.3283 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/216288 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Pointlike Baryons? | |
| dc.type | text |