Subleading contributions to the decay width of the T-cc(+) tetraquark
文献类型：期刊论文
| 作者 | Yan, Mao-Jun; Valderrama, Manuel Pavon2 |
| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 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 |
| 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. |
入库方式： OAI收割
来源：理论物理研究所
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