Overview of $XYZ$ states and tetraquarks

Shen, C. P.; Su, Yu-Mo

doi:10.22323/1.304.0013

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Eft Lagrangian1

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2018

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(2 citation statements)

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“…contains fields with masses m D ≡ 1864.83 (5) MeV and m π ≡ 134.9770 (5) MeV determined from experiment [14]. All rest masses have been shifted to zero.…”

Section: Eft Lagrangianmentioning

confidence: 99%

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Threshold effects and the line shape of the X(3872) in effective field theory

2018

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Latest measurements suggest that the X(3872) mass lies less than 200 keV away from the D 0D0 * threshold, reenforcing its interpretation as a loosely-bound mesonic molecule. This observation implies that in processes like D 0D0 π 0 production, threshold effects could disguise the actual pole position of the X(3872). We propose a new effective field theory with D 0 ,D 0 and π 0 degrees of freedom for the X(3872), considering Galilean invariance to be an exact symmetry. The D 0 * enters as a D 0 π 0 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 D 0D0 π 0 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.

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“…contains fields with masses m D ≡ 1864.83 (5) MeV and m π ≡ 134.9770 (5) MeV determined from experiment [14]. All rest masses have been shifted to zero.…”

Section: Eft Lagrangianmentioning

confidence: 99%

“…So far, their nature remains unclear and is under discussion (see, e.g., Refs. [3][4][5][6] for reviews). The X(3872) (simply denoted 'X' in the following) is by far the best-studied example of these states.…”

Section: Introductionmentioning

confidence: 99%