Measurement of charm production at central rapidity in proton-proton collisions at 脰s = 2.76 \textTeV \sqrt {s} = 2.76\;{\text{TeV}}
详细信息    查看全文
文摘
The p t-differential production cross sections of the prompt (B feed-down subtracted) charmed mesons D0, D+, and D*+ in the rapidity range |y| < 0.5, and for transverse momentum 1 < p t  < 12 GeV/c, were measured in proton-proton collisions at 脰s = 2.76 \textTeV \sqrt {s} = 2.76\;{\text{TeV}} with the ALICE detector at the Large Hadron Collider. The analysis exploited the hadronic decays D0 → K−π+, D+ → K−π+π+, D*+ → D0π+, and their charge conjugates, and was performed on a Lint = 1.1 \textn\textb - 1 {\mathcal{L}_{{{\rm int} }}} = 1.1\;{\text{n}}{{\text{b}}^{{ - 1}}} event sample collected in 2011 with a minimum-bias trigger. The total charm production cross section at 脰s = 2.76 \textTeV \sqrt {s} = 2.76\;{\text{TeV}} and at 7 TeV was evaluated by extrapolating to the full phase space the p t-differential production cross sections at 脰s = 2.76 \textTeV \sqrt {s} = 2.76\;{\text{TeV}} and our previous measurements at 脰s = 7 \textTeV \sqrt {s} = 7\;{\text{TeV}} . The results were compared to existing measurements and to perturbative-QCD calculations. The fraction of \textc[`(\textd)] {\text{c}}\overline {\text{d}} D mesons produced in a vector state was also determined.
NGLC 2004-2010.National Geological Library of China All Rights Reserved.
Add:29 Xueyuan Rd,Haidian District,Beijing,PRC. Mail Add: 8324 mailbox 100083
For exchange or info please contact us via email.