Lattice QCD calculation of the invisible decay $J/ψ\rightarrow γν\barν$
Fuente:
arXiv
Saved in:
| Main Author: | |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910306339389440 |
|---|---|
| author | Meng, Yu |
| author_facet | Meng, Yu |
| contents | In this work, we present the first lattice QCD study on the invisible decay $J/ψ\rightarrow γν\barν$. The calculation is accomplished using $N_f=2$ twisted mass fermion ensembles. The excited-state effects are observed and eliminated using a multi-state fit. The impact of finite-volume effects is also examined and confirmed to be well-controlled. After a continuous extrapolation under three lattice spacings, we obtain the branching fraction as $\operatorname{Br}[J/ψ\rightarrow γν\barν]=1.00(9)(7)\times 10^{-10}$, where the first error is the statistical error and the second is an estimate of the systematics. The exact theoretical prediction can be used to remove the only invisible contamination from the standard model background in searching for the possible dark matter by the channel $J/ψ\rightarrow γ+\textrm{invisible}$ |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_15436 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Lattice QCD calculation of the invisible decay $J/ψ\rightarrow γν\barν$ Meng, Yu High Energy Physics - Lattice High Energy Physics - Experiment High Energy Physics - Phenomenology In this work, we present the first lattice QCD study on the invisible decay $J/ψ\rightarrow γν\barν$. The calculation is accomplished using $N_f=2$ twisted mass fermion ensembles. The excited-state effects are observed and eliminated using a multi-state fit. The impact of finite-volume effects is also examined and confirmed to be well-controlled. After a continuous extrapolation under three lattice spacings, we obtain the branching fraction as $\operatorname{Br}[J/ψ\rightarrow γν\barν]=1.00(9)(7)\times 10^{-10}$, where the first error is the statistical error and the second is an estimate of the systematics. The exact theoretical prediction can be used to remove the only invisible contamination from the standard model background in searching for the possible dark matter by the channel $J/ψ\rightarrow γ+\textrm{invisible}$ |
| title | Lattice QCD calculation of the invisible decay $J/ψ\rightarrow γν\barν$ |
| topic | High Energy Physics - Lattice High Energy Physics - Experiment High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2309.15436 |