Lattice QCD Calculation of Electroweak Box Contributions to Superallowed Nuclear and Neutron Beta Decays
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2023
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866913320599027712 |
|---|---|
| author | Ma, Peng-Xiang Feng, Xu Gorchtein, Mikhail Jin, Lu-Chang Liu, Keh-Fei Seng, Chien-Yeah Wang, Bi-Geng Zhang, Zhao-Long |
| author_facet | Ma, Peng-Xiang Feng, Xu Gorchtein, Mikhail Jin, Lu-Chang Liu, Keh-Fei Seng, Chien-Yeah Wang, Bi-Geng Zhang, Zhao-Long |
| contents | We present the first lattice QCD calculation of the universal axial $γW$-box contribution $\square_{γW}^{VA}$ to both superallowed nuclear and neutron beta decays. This contribution emerges as a significant component within the theoretical uncertainties surrounding the extraction of $|V_{ud}|$ from superallowed decays. Our calculation is conducted using two domain wall fermion ensembles at the physical pion mass. To construct the nucleon 4-point correlation functions, we employ the random sparsening field technique. Furthermore, we incorporate long-distance contributions to the hadronic function using the infinite-volume reconstruction method. Upon performing the continuum extrapolation, we arrive at $\square_{γW}^{VA}=3.65(8)_{\mathrm{lat}}(1)_{\mathrm{PT}}\times10^{-3}$. Consequently, this yields a slightly higher value of $|V_{ud}|=0.97386(11)_{\mathrm{exp.}}(9)_{\mathrm{RC}}(27)_{\mathrm{NS}}$, reducing the previous $2.1σ$ tension with the CKM unitarity to $1.8σ$. Additionally, we calculate the vector $γW$-box contribution to the axial charge $g_A$, denoted as $\square_{γW}^{VV}$, and explore its potential implications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_16755 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Lattice QCD Calculation of Electroweak Box Contributions to Superallowed Nuclear and Neutron Beta Decays Ma, Peng-Xiang Feng, Xu Gorchtein, Mikhail Jin, Lu-Chang Liu, Keh-Fei Seng, Chien-Yeah Wang, Bi-Geng Zhang, Zhao-Long High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Experiment We present the first lattice QCD calculation of the universal axial $γW$-box contribution $\square_{γW}^{VA}$ to both superallowed nuclear and neutron beta decays. This contribution emerges as a significant component within the theoretical uncertainties surrounding the extraction of $|V_{ud}|$ from superallowed decays. Our calculation is conducted using two domain wall fermion ensembles at the physical pion mass. To construct the nucleon 4-point correlation functions, we employ the random sparsening field technique. Furthermore, we incorporate long-distance contributions to the hadronic function using the infinite-volume reconstruction method. Upon performing the continuum extrapolation, we arrive at $\square_{γW}^{VA}=3.65(8)_{\mathrm{lat}}(1)_{\mathrm{PT}}\times10^{-3}$. Consequently, this yields a slightly higher value of $|V_{ud}|=0.97386(11)_{\mathrm{exp.}}(9)_{\mathrm{RC}}(27)_{\mathrm{NS}}$, reducing the previous $2.1σ$ tension with the CKM unitarity to $1.8σ$. Additionally, we calculate the vector $γW$-box contribution to the axial charge $g_A$, denoted as $\square_{γW}^{VV}$, and explore its potential implications. |
| title | Lattice QCD Calculation of Electroweak Box Contributions to Superallowed Nuclear and Neutron Beta Decays |
| topic | High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Experiment |
| url | https://arxiv.org/abs/2308.16755 |