出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Charmonia are flavour singletmesons and thus in principle contributions fromdisconnected quark
line diagrams might affect their masses, either directly or via mixing with other flavour singlet
channels. We present a first study that takes both effects into account. We employ improved
stochastic all-to-all propagator techniques (including new methods) to calculate the diagrams that
appear within the mixing matrix between the h′ and the hc. The runs are initially performed
on Nf = 2 163×32 configurations with the non-perturbatively improved Sheikholeslami-Wilson
action, both for valence and sea quarks.
