J/ψ production as a function of charged particle multiplicity in pp collisions at s=7TeV


Abelev B., Adam J., Adamová D., Adare A., Aggarwal M., Aglieri Rinella G., ...Daha Fazla

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, cilt.712, sa.3, ss.165-175, 2012 (SCI-Expanded) identifier identifier

Özet

The ALICE Collaboration reports the measurement of the relative J/ψ yield as a function of charged particle pseudorapidity density dNch/dη in pp collisions at s=7TeV at the LHC. J/ψ particles are detected for pt>0, in the rapidity interval |y|<0.9 via decay into e+e-, and in the interval 2.50. In the highest multiplicity interval with 〈 dNch/dη(bin)〉 =24.1, corresponding to four times the minimum bias multiplicity density, an enhancement relative to the minimum bias J/ψ yield by a factor of about 5 at 2.5