Abstract
The ratio between the prompt and yields, reconstructed via their decays into , is measured in Pb-Pb and - collisions at . The analysis is based on Pb-Pb and - data samples collected by CMS at the Large Hadron Collider, corresponding to integrated luminosities of and , respectively. The double ratio of measured yields is computed in three Pb-Pb collision centrality bins and two kinematic ranges: one at midrapidity, , covering the transverse momentum range , and the other at forward rapidity, , extending to lower values, . The centrality-integrated double ratio changes from in the first range to in the second. This difference is most pronounced in the most central collisions.
- Received 7 October 2014
DOI:https://doi.org/10.1103/PhysRevLett.113.262301
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© 2014 CERN, for the The CMS Collaboration