Please use this identifier to cite or link to this item: http://localhost:80/handle/1956/4578
Title: Study of the dependence of direct soft photon production on the jet characteristics in hadronic Z0 decays
subject: VDP::Mathematics and natural science: 400
Publisher: Springer
Description: There are 341 authors for this article. Only five of them have been given author entries in addition to the Collaboration
Journal Article
An analysis of the direct soft photon production rate as a function of the parent jet characteristics is presented, based on hadronic events collected by the DELPHI experiment at LEP1. The dependences of the photon rates on the jet kinematic characteristics (momentum, mass, etc.) and on the jet charged, neutral and total hadron multiplicities are reported. Up to a scale factor of about four, which characterizes the overall value of the soft photon excess, a similarity of the observed soft photon behavior to that of the inner hadronic bremsstrahlung predictions is found for the momentum, mass, and jet charged multiplicity dependences. However for the dependence of the soft photon rate on the jet neutral and total hadron multiplicities a prominent difference is found for the observed soft photon signal as compared to the expected bremsstrahlung from final state hadrons. The observed linear increase of the soft photon production rate with the jet total hadron multiplicity and its strong dependence on the jet neutral multiplicity suggest that the rate is proportional to the number of quark pairs produced in the fragmentation process, with the neutral pairs being more effectively radiating than the charged ones.
publishedVersion
URI: http://localhost:80/handle/1956/4578
More Information: The European Physical Journal C 67: 343-366
http://hdl.handle.net/1956/4578
10.1140/epjc/s10052-010-1315-5
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Study of the dependence of direct soft photon production on the jet characteristics in hadronic Z0 decays
subject: VDP::Mathematics and natural science: 400
Publisher: Springer
Description: There are 341 authors for this article. Only five of them have been given author entries in addition to the Collaboration
Journal Article
An analysis of the direct soft photon production rate as a function of the parent jet characteristics is presented, based on hadronic events collected by the DELPHI experiment at LEP1. The dependences of the photon rates on the jet kinematic characteristics (momentum, mass, etc.) and on the jet charged, neutral and total hadron multiplicities are reported. Up to a scale factor of about four, which characterizes the overall value of the soft photon excess, a similarity of the observed soft photon behavior to that of the inner hadronic bremsstrahlung predictions is found for the momentum, mass, and jet charged multiplicity dependences. However for the dependence of the soft photon rate on the jet neutral and total hadron multiplicities a prominent difference is found for the observed soft photon signal as compared to the expected bremsstrahlung from final state hadrons. The observed linear increase of the soft photon production rate with the jet total hadron multiplicity and its strong dependence on the jet neutral multiplicity suggest that the rate is proportional to the number of quark pairs produced in the fragmentation process, with the neutral pairs being more effectively radiating than the charged ones.
publishedVersion
URI: http://localhost:80/handle/1956/4578
More Information: The European Physical Journal C 67: 343-366
http://hdl.handle.net/1956/4578
10.1140/epjc/s10052-010-1315-5
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Study of the dependence of direct soft photon production on the jet characteristics in hadronic Z0 decays
subject: VDP::Mathematics and natural science: 400
Publisher: Springer
Description: There are 341 authors for this article. Only five of them have been given author entries in addition to the Collaboration
Journal Article
An analysis of the direct soft photon production rate as a function of the parent jet characteristics is presented, based on hadronic events collected by the DELPHI experiment at LEP1. The dependences of the photon rates on the jet kinematic characteristics (momentum, mass, etc.) and on the jet charged, neutral and total hadron multiplicities are reported. Up to a scale factor of about four, which characterizes the overall value of the soft photon excess, a similarity of the observed soft photon behavior to that of the inner hadronic bremsstrahlung predictions is found for the momentum, mass, and jet charged multiplicity dependences. However for the dependence of the soft photon rate on the jet neutral and total hadron multiplicities a prominent difference is found for the observed soft photon signal as compared to the expected bremsstrahlung from final state hadrons. The observed linear increase of the soft photon production rate with the jet total hadron multiplicity and its strong dependence on the jet neutral multiplicity suggest that the rate is proportional to the number of quark pairs produced in the fragmentation process, with the neutral pairs being more effectively radiating than the charged ones.
publishedVersion
URI: http://localhost:80/handle/1956/4578
More Information: The European Physical Journal C 67: 343-366
http://hdl.handle.net/1956/4578
10.1140/epjc/s10052-010-1315-5
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.