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Regular version of the site

Article

Measurement of ๐œ“(2๐‘†) production cross-sections in proton-proton collisions at โˆš๐‘ =7 and 13 TeV

Derkach D., Hushchyn M., Kazeev N., Ratnikov F., Ustyuzhanin A., LHCb C.

The cross-sections of ๐œ“(2๐‘†) meson production in proton-proton collisions at ๐‘ √=13 TeV are measured with a data sample collected by the LHCb detector corresponding to an integrated luminosity of 275 pb−1. The production cross-sections for prompt ๐œ“(2๐‘†) mesons and those for ๐œ“(2๐‘†) mesons from b-hadron decays (๐œ“(2๐‘†)-from- ๐‘) are determined as functions of the transverse momentum, ๐‘T, and the rapidity, y, of the ๐œ“(2๐‘†) meson in the kinematic range 2<๐‘T<20 GeV/๐‘ and 2.0<๐‘ฆ<4.5

. The production cross-sections integrated over this kinematic region are

๐œŽ( prompt ๐œ“(2๐‘†),13 TeV)=1.430±0.005 (stat)±0.099 (syst)μb,๐œŽ(๐œ“(2๐‘†)-from- ๐‘,13 TeV)=0.426±0.002 (stat)±0.030 (syst)μb.

A new measurement of ๐œ“(2๐‘†)

production cross-sections in pp collisions at ๐‘ √=7 TeV is also performed using data collected in 2011, corresponding to an integrated luminosity of 614 pb−1. The integrated production cross-sections in the kinematic range 3.5<๐‘T<14 GeV/๐‘ and 2.0<๐‘ฆ<4.5

are

๐œŽ( prompt ๐œ“(2๐‘†),7 TeV)=0.471±0.001 (stat)±0.025 (syst)μb,๐œŽ(๐œ“(2๐‘†)-from- ๐‘,7 TeV)=0.126±0.001 (stat)±0.008 (syst)μb.

All results show reasonable agreement with theoretical calculations.