# Measurement of Upsilon production in pp collisions at $\sqrt{s}$ = 2.76 TeV

LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2014). Measurement of Upsilon production in pp collisions at $\sqrt{s}$ = 2.76 TeV. European Physical Journal C - Particles and Fields, 74:2835.

## Abstract

The production of Υ(1S), Υ(2S) and Υ(3S) mesons decaying into the dimuon final state is studied with the LHCb detector using a data sample corresponding to an integrated luminosity of 3.3 pb−1 collected in proton-proton collisions at a centre-of-mass energy of s√=2.76 TeV. The differential production cross-sections times dimuon branching fractions are measured as functions of the Υ transverse momentum and rapidity, over the ranges pT<15 GeV/c and 2.0<y<4.5. The total cross-sections in this kinematic region, assuming unpolarised production, are measured to be σ(pp→Υ(1S)X)×B(Υ(1S)→μ+μ−)σ(pp→Υ(2S)X)×B(Υ(2S)→μ+μ−)σ(pp→Υ(3S)X)×B(Υ(3S)→μ+μ−)===1.111±0.043±0.044nb,0.264±0.023±0.011nb,0.159±0.020±0.007nb,
where the first uncertainty is statistical and the second systematic.

## Abstract

The production of Υ(1S), Υ(2S) and Υ(3S) mesons decaying into the dimuon final state is studied with the LHCb detector using a data sample corresponding to an integrated luminosity of 3.3 pb−1 collected in proton-proton collisions at a centre-of-mass energy of s√=2.76 TeV. The differential production cross-sections times dimuon branching fractions are measured as functions of the Υ transverse momentum and rapidity, over the ranges pT<15 GeV/c and 2.0<y<4.5. The total cross-sections in this kinematic region, assuming unpolarised production, are measured to be σ(pp→Υ(1S)X)×B(Υ(1S)→μ+μ−)σ(pp→Υ(2S)X)×B(Υ(2S)→μ+μ−)σ(pp→Υ(3S)X)×B(Υ(3S)→μ+μ−)===1.111±0.043±0.044nb,0.264±0.023±0.011nb,0.159±0.020±0.007nb,
where the first uncertainty is statistical and the second systematic.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics Physical Sciences > Engineering (miscellaneous) Physical Sciences > Physics and Astronomy (miscellaneous) English 2014 24 Feb 2015 14:18 07 May 2020 00:04 Springer 1434-6044 Gold Publisher DOI. An embargo period may apply. https://doi.org/10.1140/epjc/s10052-014-2835-1