Measurement of Υ production in pp collisions at √ˆšs=5 TeV

• The production cross-sections of Υ mesons, namely Υ(1S), Υ(2S) anΥ(3S), in pp collisions at root s = 5TeV are measured with a data sample corresponding to an integrated luminosity of 9.13 +/- 0.18 pb(-1) collected by the LHCb detector. The (sic) mesons are reconstructed in the decay mode Υ -> mu(+)mu(-). Double differential cross-sections times branching fractions, as functions of the transverse momentum p(T) and the rapidity y of the (sic) mesons, are measured in the range pT < 20 GeV/ c and 2.0 < y < 4.5. The results integrated over these pT and y ranges are sigma(Υ(1S)) x B(Υ(1S) -> mu(+) mu(-)) = 2101 +/- 33 +/- 83 pb, sigma(Υ(2S)) x B(Υ(2S) -> mu(+) mu(-)) = 526 +/- 20 +/- 21 pb, sigma(Υ(3S)) x B(Υ(3S) -> mu(+) mu(-)) = 242 +/- 16 +/- 10 pb, where the first uncertainties are statistical and the second are systematic. The ratios of cross-sections between measurements of two different (sic) states and between measurements at different centre-of-mass energies are determined. The nuclear modification factor of Υ(1S) at root s = 5TeV is updated as well using the directly measured cross-section results from this analysis.

Ämnesord

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

Nyckelord

Hadron-Hadron Scattering

Heavy Quark Production

QCD

Quarkonium

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