2012/09/09 by Gagik K. Yeghiyan, Yeghiyan, Gagik · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1209.1854
openalex publication_date 2012/09/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We re-visit the problem of non-perturbative contribution to the mass difference in D0-D0bar mixing within the Standard Model (SM). There are two known approaches to take this contribution into account. In the long long-distance approach one analyzes contribution to the D0-D0bar from exclusive channels due to production of intermediate charmless hadronic states. In the short-distance approach one employs the Operator Product Expansion (OPE) techniques with the non-perturbative contribution coming from the diagrams containing low energy-momentum quark states - quark-antiquark condensates. Within the latter approach, the non-perturbative contribution to the normalized mass difference in D0-D0bar mixing, xD = Delta MD / GammaD, is estimated to be few x 10-3, that is to say very close to the experimental value of xD. We attempt to verify quantitatively this estimate here. We find that the actual prediction of the short-distance approach is few times less than the estimate above and order of magnitude less than the experimental value of xD.