IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Measurements of ψ(2S) and X(3872)→J/ψπ+π− production in pp collisions at s√=8 TeV with the ATLAS detector
Autor/es:
ATLAS; F. MONTICELLI
Revista:
JOURNAL OF HIGH ENERGY PHYSICS
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2016
ISSN:
1126-6708
Resumen:
Differential cross sections are presented for the prompt and non-prompt production of thehidden-charm states X(3872) and ψ(2S ), in the decay mode J/ψπ + π − , measured using11.4 fb −1 of pp collisions at s = 8 TeV by the ATLAS detector at the LHC. The ratio of cross-sections X(3872)/ψ(2S ) is also given, separately for prompt and non-promptcomponents, as well as the non-prompt fractions of X(3872) and ψ(2S ). Assuming independent single effective lifetimes for non-prompt X(3872) and ψ(2S ) production gives+ any)B(X(3872)→J/ψπ + π − )R B = B(B→X(3872)= (3.95 ± 0.32(stat) ± 0.08(sys)) × 10 −2 , whileB(B→ψ(2S ) + any)B(ψ(2S )→J/ψπ + π − )separating short- and long-lived contributions, assuming that the short-lived componentis due to B c decays, gives R B = (3.57 ± 0.33(stat) ± 0.11(sys)) × 10 −2 , with the frac-tion of non-prompt X(3872) produced via B c decays for p T (X(3872)) > 10 GeV being(25 ± 13(stat) ± 2(sys) ± 5(spin))%. The distributions of the dipion invariant mass in theX(3872) and ψ(2S ) decays are also measured and compared to theoretical predictions.