Measurement of the chib2/chib1 production cross section ratio in pp collisions at sqrt(s)= 8 TeV
Collaboration
Citations per year
Abstract:
The ratio of cross sections of and bottomonium states promptly produced in pp collisions at \,TeV is measured by detecting their radiative decays with the CMS experiment. The emitted photons are detected through their conversion to pairs, with the electron trajectories accurately reconstructed in the silicon tracker, so that the two states can be resolved with a good mass resolution. The measurement is based on an event sample corresponding to an integrated luminosity of 20.7\,fb and is performed in a phase space region defined by selection cuts on the photon pseudorapidity and on the transverse momentum and rapidity: , \,GeV, and . The measured cross-section ratio is around 0.9, with no significant dependence on p_{\rm T}^\Y.Note:
- Preliminary results
- Data
- p p: scattering
- cross section: ratio: measured
- bottomonium: direct production
- chi/b1(9890): radiative decay
- chi/b2(9915): radiative decay
- photon: particle identification
- Upsilon(9460): transverse momentum
- mass resolution
- phase space
References(19)
Figures(6)
- [1]
- [2]
- [3]
- [4]
- [5]
- [6]
- [7]
- [8]
- [9]
- [10]
- [11]
- [12]
- [13]
- [14]
- [15]
- [16]
- [17]
- [18]
- [19]