Publication
First Measurement of Chiral Dynamics in \pi^- \gamma -> \pi^- \pi^- \pi^+
| dc.contributor.author | COMPASS collaboration (212 authors) | |
| dc.contributor.author | Bordalo, P. | |
| dc.contributor.author | Franco, C. | |
| dc.contributor.author | Nunes, A.S. | |
| dc.contributor.author | Quintans, C. | |
| dc.contributor.author | Ramos, S. | |
| dc.contributor.author | Silva, L. | |
| dc.contributor.author | Stolarski, M. | |
| dc.date.accessioned | 2019-02-03T18:25:37Z | |
| dc.date.available | 2019-02-03T18:25:37Z | |
| dc.date.issued | 2011-11 | |
| dc.date.updated | 2019-02-03T18:25:36Z | |
| dc.description.abstract | The COMPASS collaboration at CERN has investigated the \pi^- \gamma -> \pi^- \pi^- \pi^+ reaction at center-of-momentum energy below five pion masses, sqrt(s) < 5 m(\pi), embedded in the Primakoff reaction of 190 GeV pions impinging on a lead target. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, t' < 0.001 (GeV/c)^2. Using partial-wave analysis techniques, the scattering intensity of Coulomb production described in terms of chiral dynamics and its dependence on the 3\pi-invariant mass m(3\pi) = sqrt(s) were extracted. The absolute cross section was determined in seven bins of $\sqrt{s}$ with an overall precision of 20%. At leading order, the result is found to be in good agreement with the prediction of chiral perturbation theory over the whole energy range investigated. | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | Phys.Rev.Lett. 108 (2012) 192001; DOI 10.1103/PhysRevLett.108.192001 | |
| dc.identifier.uri | http://dx.doi.org/10.1103/PhysRevLett.108.192001 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/26064 | |
| dc.language.iso | eng | |
| dc.title | First Measurement of Chiral Dynamics in \pi^- \gamma -> \pi^- \pi^- \pi^+ | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article |