Measurement of the Υ(1S) production cross-section in pp collisions at s=7 TeV in ATLAS
A measurement of the cross-section for Υ(1S)→μ + μ - production in proton-proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the Υ(1S) transverse momentum in two bins of rapidity, |y Υ(1S) |<1.2 and 1.2<|y Υ(1S) |<2.4...
Guardado en:
| Publicado: |
2011
|
|---|---|
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v705_n1-2_p9_Aad http://hdl.handle.net/20.500.12110/paper_03702693_v705_n1-2_p9_Aad |
| Aporte de: |
| Sumario: | A measurement of the cross-section for Υ(1S)→μ + μ - production in proton-proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the Υ(1S) transverse momentum in two bins of rapidity, |y Υ(1S) |<1.2 and 1.2<|y Υ(1S) |<2.4. The measurement requires that both muons have transverse momentum pTμ>4 GeV and pseudorapidity |η μ |<2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarisation. The results are based on an integrated luminosity of 1.13 pb -1 , collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in Pythia while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet model. © 2011 CERN. |
|---|