Measurement of the differential isolated diphoton production cross section in pp collisions at sqrt(s) = 7 TeV with the CMS detector
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Abstract:
The measurement of the isolated diphoton production cross section in pp collisions at ~=~7~\TeV is presented. The dataset corresponds to an integrated luminosity of 5.0~fb collected by the CMS experiment in the year 2011. A new data-driven method to extract the prompt diphoton yield is used, based on the photon component of the particle-flow isolation. The measured cross section for two isolated photons with transverse momentum above 40 GeV and 25 GeV respectively, in the acceptance and with an angular separation , is pb. The cross section is measured differentially as a function of the diphoton invariant mass, the diphoton transverse momentum, the azimuthal angle difference between the two photons, and the cosine of the polar angle in the Collins-Soper frame of the diphoton pair. Results are compared to theory predictions at leading, next-to-leading and next-to-next-to-leading order for diphoton production.Note:
- Preliminary results
- Data
- differential cross section: measured
- p p: scattering
- higher-order: 2
- higher-order: 1
- two-photon
- transverse momentum dependence
- photon: isolated production
- CMS
- particle flow
References(32)
Figures(18)
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