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Threshold Effects and the Line Shape of the X(3872) in Effective Field Theory
- Source :
- Phys. Rev. D 98, 014032 (2018)
- Publication Year :
- 2018
-
Abstract
- Latest measurements suggest that the X(3872) mass lies less than 200 keV away from the D0-Dbar0* threshold, reenforcing its interpretation as a loosely-bound mesonic molecule. This observation implies that in processes like D0-Dbar0-pi0 production, threshold effects could disguise the actual pole position of the X(3872). We propose a new effective field theory with D0, Dbar0 and pi0 degrees of freedom for the X(3872), considering Galilean invariance to be an exact symmetry. The D0* enters as a D0-pi0 p-wave resonance, allowing for a comprehensive study of the influence of pion interactions on the X(3872) width. We calculate relations between the mass of the X(3872), its width, and its line shape in D0-Dbar0-pi0 production up to next-to-leading order. Our results provide a tool for the extraction of the X(3872) pole position from the experimental data near threshold.<br />Comment: 31 pages, 14 figures, published version; added some remarks and four references, edited Figure 12, minor typographic corrections
- Subjects :
- High Energy Physics - Phenomenology
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. D 98, 014032 (2018)
- Publication Type :
- Report
- Accession number :
- edsarx.1804.00375
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevD.98.014032