Looking for an axion in a haystack of muons
Fuente:
arXiv
Salvato in:
| Autore principale: | |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2023
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866911768099422208 |
|---|---|
| author | Gurgone, A. |
| author_facet | Gurgone, A. |
| contents | The search for axion-like particles $X$ in muon decays is an excellent opportunity for the MEG II and Mu3e experiments to extend their horizons beyond $μ^+ \to e^+ γ$ and $μ^+ \to e^+ e^- e^+$. A suitable process for both experiments is the two-body decay $μ^+ \to e^+ X$, whose only signature is a monochromatic peak close to the kinematic endpoint of the positron energy spectrum of the $μ^+ \to e^+ ν_e \barν_μ$ background. The hunt for such an elusive signal in a vast amount of irreducible background requires extremely accurate theoretical predictions to be implemented in a Monte Carlo event generator. This work presents a new state-of-the-art computation of $μ^+ \to e^+ ν_e \barν_μ$ for polarised muons, accomplished with the McMule framework. The calculation includes next-to-next-leading order QED corrections and logarithmically enhanced terms at even higher orders. The results are also used to estimate the sensitivity of both experiments on the branching ratio of $μ^+ \to e^+ X$, in order to evaluate the impact of the theoretical error. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_04294 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Looking for an axion in a haystack of muons Gurgone, A. High Energy Physics - Phenomenology High Energy Physics - Experiment The search for axion-like particles $X$ in muon decays is an excellent opportunity for the MEG II and Mu3e experiments to extend their horizons beyond $μ^+ \to e^+ γ$ and $μ^+ \to e^+ e^- e^+$. A suitable process for both experiments is the two-body decay $μ^+ \to e^+ X$, whose only signature is a monochromatic peak close to the kinematic endpoint of the positron energy spectrum of the $μ^+ \to e^+ ν_e \barν_μ$ background. The hunt for such an elusive signal in a vast amount of irreducible background requires extremely accurate theoretical predictions to be implemented in a Monte Carlo event generator. This work presents a new state-of-the-art computation of $μ^+ \to e^+ ν_e \barν_μ$ for polarised muons, accomplished with the McMule framework. The calculation includes next-to-next-leading order QED corrections and logarithmically enhanced terms at even higher orders. The results are also used to estimate the sensitivity of both experiments on the branching ratio of $μ^+ \to e^+ X$, in order to evaluate the impact of the theoretical error. |
| title | Looking for an axion in a haystack of muons |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2308.04294 |