Short-distance RG-analysis of $X(3872)$ radiative decays

• Main Authors: Molnar, D. A. S, Luiz, R. F, Higa, R
• Format: Journal Article
• Language: English
• Published: 13-01-2016
• Subjects: Physics - High Energy Physics - Phenomenology; Physics - Nuclear Theory
• DOI: 10.48550/arxiv.1601.03366

We present a renormalization-group analysis of the $X(3872)$ radiative decays
into $J/ \psi \gamma$ and $\psi(2S) \gamma$. We assume a $D\bar{D}^{*}$
molecule for the $X$ long-distance structure and parametrize its short-distance
physics as contact interactions. Using effective field theory techniques and
power-divergence subtraction scheme, we find that short- and long-distance
physics are equally important in these decays. Our calculations set a lower
limit to the corresponding decay widths, which can in principle be tested
experimentally. Our results may be used as guide to build models for the $X$
short-distance.