Subleading contributions to the decay width of the T-cc(+) tetraquark

doi:10.1103/PhysRevD.105.014007

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	Subleading contributions to the decay width of the T-cc(+) tetraquark
	Yan, Mao-Jun ; Valderrama, Manuel Pavon 2
刊名	PHYSICAL REVIEW D
	2022
卷号	105 期号:1 页码:14007
关键词	EFFECTIVE-FIELD THEORY STATES STABILITY DEUTERON FORCES
ISSN号	2470-0010
DOI	10.1103/PhysRevD.105.014007
英文摘要	Recently, the LHCb Collaboration announced the discovery of the T-cc(+) tetraquark. Being merely a few hundred keV below the D*+D-0 threshold, the T-cc(+) is expected to have a molecular component, for which there is a good separation of scales that can be exploited to make reasonably accurate theoretical predictions about this tetraquark. Independently of its nature, the most important decay channels will be D+D-0 pi(0), (DD0)-D-0 pi(+), and D+D-0 gamma. Its closeness to threshold suggests that the mass and particularly the width of the T-cc(+) tetraquark depend on the resonance profile. While the standard Breit-Wigner parametrization generates a T-cc(+) that is too broad for current theoretical calculations to reproduce, a three-body unitarized Breit-Wigner shape reveals instead a decay width (Gamma(pole) = 48 +/- 2(-12)(+0) keV) consistent with theoretical expectations. Here, we consider subleading-order contributions to the decay amplitude, which, though having at most a moderate impact in the width, still indicate potentially significant differences with the experimental width that can be exploited to disentangle the nature of the T-cc(+). Concrete calculations yield Gamma(LO) = 49 +/- 16 keV and Gamma NLO = 58(-6)(+7) keV, though we expect further corrections to the next-to-leading-order (NLO) decay widths from asymptotic normalization effects. We find that a detailed comparison of the NLO total and partial decay widths with experiment suggests the existence of a small (but distinguishable from zero) nonmolecular component of the T-cc(+).
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27869]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Beihang Univ, Sch Phys, Beijing 100191, Peoples R China 2.[Yan, Mao-Jun 3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Yan, Mao-Jun,Valderrama, Manuel Pavon. Subleading contributions to the decay width of the T-cc(+) tetraquark[J]. PHYSICAL REVIEW D,2022,105(1):14007.
APA	Yan, Mao-Jun,&Valderrama, Manuel Pavon.(2022).Subleading contributions to the decay width of the T-cc(+) tetraquark.PHYSICAL REVIEW D,105(1),14007.
MLA	Yan, Mao-Jun,et al."Subleading contributions to the decay width of the T-cc(+) tetraquark".PHYSICAL REVIEW D 105.1(2022):14007.