12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Measurement of the D*+- cross-section in two ph...
View graph of relations

« Back

Measurement of the D*+- cross-section in two photon collisions at LEP

Research output: Contribution to journalJournal article

Published

Journal publication date1995
JournalPhysics Letters B
Journal number3-4
Volume355
Number of pages11
Pages595-605
Original languageEnglish

Abstract

The inclusive production of D∗± mesons in photon-photon collisions has been measured by the Aleph experiment at LEP with a beam energy of 45 GeV. The D∗+ are detected in their decay to D0π+ with the D0 observed in three separate decay modes: (1) K−π+, (2) K−π+π0 and (3) K−π+π−π+, and analagously for the D∗− modes. A total of 33 events was observed from an integrated luminosity of 73 pb−1 which corresponds to a cross section for ) of 155 ± 33 ± 21 pb. This result is compatible with both the direct production γγ → c in the Born approximation and with a more complete calculation which includes both radiative QCD corrections and contributions in which one of the photons is first resolved into its quark and gluon constituents. The shapes of distributions for events containing a D∗+ are found to be better described by the latter.