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The radiative return at phi- and B-factories: small-angle photon emission at next-to-leading order

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The radiative return at phi- and B-factories: small-angle photon emission at next-to-leading order

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dc.contributor.author Czyz, Henryk
dc.contributor.author Grzelinska, Agnieszka
dc.contributor.author Kühn, Johann H.
dc.contributor.author Rodrigo García, Germán Vicente
dc.date.accessioned 2015-06-19T10:32:18Z
dc.date.available 2015-06-19T10:32:18Z
dc.date.issued 2003
dc.identifier.citation Czyz, Henryk Grzelinska, Agnieszka Kühn, Johann H. Rodrigo García, Germán Vicente 2003 The radiative return at phi- and B-factories: small-angle photon emission at next-to-leading order European Physical Journal C 27 4 563 575
dc.identifier.uri http://hdl.handle.net/10550/44588
dc.description.abstract The radiative return offers the unique possibility for a measurement of the cross section of electron-positron annihilation into hadrons over a wide range of energies. The large luminosity of present phi- and B-factories easily compensates for the additional factor of alpha due to the emission of a hard photon. Final states with photons at large angles can be easily identified. The rate for events with collinear photons, however, is enhanced by a large logarithm and allows, in particular at lower energies, for a complementary measurement. The Monte Carlo generator PHOKHARA, which includes next-to-leading order corrections from virtual and real photon emission, has been extended from large photon angles into the collinear region, using recent results for the virtual corrections. In addition, the present version includes final state radiation for muon and pion pair production and final states with four pions. Implications for the experimental analysis at three typical energies, 1.02, 4 and 10.6 GeV, are presented: the magnitude of these new corrections is studied, possibilities for the separation of initial and final state radiation are proposed, and the differences with respect to the previous treatment based on structure functions are investigated.
dc.language.iso eng
dc.relation.ispartof European Physical Journal C, 2003, vol. 27, num. 4, p. 563-575
dc.subject Física
dc.title The radiative return at phi- and B-factories: small-angle photon emission at next-to-leading order
dc.type journal article es_ES
dc.date.updated 2015-06-19T10:32:18Z
dc.identifier.doi 10.1140/epjc/s2003-01134-4
dc.identifier.idgrec 072225
dc.rights.accessRights open access es_ES

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