6533b858fe1ef96bd12b5550

RESEARCH PRODUCT

Determination of alpha(s) using the next-to-leading-log approximation of QCD

Delphi CollaborationPaul AllenJ. T. M. ChrinMaría Victoria Castillo GiménezEduardo Cortina GilAntonio Ferrer SoriaJuan A. Fuster VerdúM. D. M. De Fez LasoJuan José Gómez CadenasCarmen García GarcíaJuan José Hernández ReyEmilio Higón RodríguezCarlos Lacasta LlácerJosé Julio Lozano BahiloSalvador Martí GarcíaJosé Salt CairolsJuan Antonio Valls FerrerJuan Zúñiga Román

subject

High Energy Physics::ExperimentFísica nuclear

description

A new measurement of alpha(s), is obtained from the distributions in thrust, heavy jet mass, energy-energy correlation and two recently introduced jet broadening variables following a method proposed by Catani, Trentadue, Turnock and Webber. This method includes the full calculation of O(alpha(s)2) terms and leading and next-to-leading logarithms resummed to all orders of alpha(s). The analysis is based on data taken with the DELPHI detector at LEP during 1991. I its found that the inclusion of the resummed leading and next-to-leading logarithms reduces the scale dependence of alpha(s) and allows an extension of the fit range towards the infrared limit of the kinematical range. The combined value for alpha(s) obtained at the scale mu2 = M(Z)2 is: alpha(s)(M(Z)2)= 0.123 +/- 0.006.

yearjournalcountryeditionlanguage
1993-01-01
http://hdl.handle.net/10550/53825