Measurement of chi(c1) and chi(c2) production with root s=7 TeV pp collisions at ATLAS
JOURNAL OF HIGH ENERGY PHYSICS, sa.7, 2014 (SCI-Expanded)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: Sayı: 7
- Basım Tarihi: 2014
- Doi Numarası: 10.1007/jhep07(2014)154
- Dergi Adı: JOURNAL OF HIGH ENERGY PHYSICS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Anahtar Kelimeler: Hadron-Hadron Scattering, J-PSI, HADRONIC PRODUCTION, UPSILON
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
The prompt and non-prompt production cross-sections for the chi(c1) and chi(c2) charmonium states are measured in pp collisions at root s = 7TeV with the ATLAS detector at the LHC using 4.5 fb(-1) of integrated luminosity. The chi(c) states are reconstructed through the radiative decay chi c -> J/psi gamma ( with J/psi -> mu(+)mu(-)) where photons are reconstructed from gamma -> e(+)e(-) conversions. The production rate of the chi(c2) state relative to the chi(c1) state is measured for prompt and non-prompt chi(c) as a function of J/psi transverse momentum. The prompt chi(c) cross-sections are combined with existing measurements of prompt J/psi production to derive the fraction of prompt J/psi produced in feed-down from chi(c) decays. The fractions of chi(c1) and chi(c2) produced in b-hadron decays are also measured.