In this thesis is presented the first measurement of the prompt production cross section ratio of the χb2(1P) and χb1 (1P) bot- tomonium states performed by detecting their radiative decays χb2,1 → Υ(1S) + γ in CMS. The photon is measured through pair conversion in the tracker, which allows the two states to be resolved with good separation. The measurement was per- formed in the kinematical region |y(Υ)| < 1.25, |η(γ)| < 1.0, 7.0 GeV < pT (Υ) < 40.0 GeV. 20.7 fb−1 of data from proton- proton collisions at √s=8 TeV collected in 2012 were analyzed.
Misura della sezione d'urto di produzione relativa di chi_b2(1P) e chi_b1(1P) in collisioni protone-protone con il detector CMS a LHC
DUJANY, GIULIO
2012/2013
Abstract
In this thesis is presented the first measurement of the prompt production cross section ratio of the χb2(1P) and χb1 (1P) bot- tomonium states performed by detecting their radiative decays χb2,1 → Υ(1S) + γ in CMS. The photon is measured through pair conversion in the tracker, which allows the two states to be resolved with good separation. The measurement was per- formed in the kinematical region |y(Υ)| < 1.25, |η(γ)| < 1.0, 7.0 GeV < pT (Υ) < 40.0 GeV. 20.7 fb−1 of data from proton- proton collisions at √s=8 TeV collected in 2012 were analyzed.File in questo prodotto:
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Utilizza questo identificativo per citare o creare un link a questo documento:
https://hdl.handle.net/20.500.14240/60087