Z lepton flavour violation as a probe for new physics at future $$e^+e^-$$ e + e - colliders
Abstract In this work we assess the potential of discovering new physics by searching for lepton-flavour-violating (LFV) decays of the Z boson, $$Z\rightarrow \ell _i \ell _j$$ Z → ℓ i ℓ j , at the proposed circular $$e^+e^-$$ e + e - colliders CEPC and FCC-ee. Both projects plan to run at the Z-pol...
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2021
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oai:doaj.org-article:390b0362f1e4471783ffeb34a3c0304b2021-12-05T12:09:16ZZ lepton flavour violation as a probe for new physics at future $$e^+e^-$$ e + e - colliders10.1140/epjc/s10052-021-09777-31434-60441434-6052https://doaj.org/article/390b0362f1e4471783ffeb34a3c0304b2021-12-01T00:00:00Zhttps://doi.org/10.1140/epjc/s10052-021-09777-3https://doaj.org/toc/1434-6044https://doaj.org/toc/1434-6052Abstract In this work we assess the potential of discovering new physics by searching for lepton-flavour-violating (LFV) decays of the Z boson, $$Z\rightarrow \ell _i \ell _j$$ Z → ℓ i ℓ j , at the proposed circular $$e^+e^-$$ e + e - colliders CEPC and FCC-ee. Both projects plan to run at the Z-pole as a “Tera Z factory”, i.e., collecting $${\mathcal {O}}\left( 10^{12} \right) $$ O 10 12 Z decays. In order to discuss the discovery potential in a model-independent way, we revisit the LFV Z decays in the context of the Standard Model effective field theory and study the indirect constraints from LFV $$\mu $$ μ and $$\tau $$ τ decays on the operators that can induce $$Z\rightarrow \ell _i \ell _j$$ Z → ℓ i ℓ j . We find that, while the $$Z\rightarrow \mu e$$ Z → μ e rates are beyond the expected sensitivities, a Tera Z factory is promising for $$Z\rightarrow \tau \ell $$ Z → τ ℓ decays, probing New Physics at the same level of future low-energy LFV observables.Lorenzo CalibbiXabier MarcanoJoydeep RoySpringerOpenarticleAstrophysicsQB460-466Nuclear and particle physics. Atomic energy. RadioactivityQC770-798ENEuropean Physical Journal C: Particles and Fields, Vol 81, Iss 12, Pp 1-18 (2021) |
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DOAJ |
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DOAJ |
| language |
EN |
| topic |
Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 |
| spellingShingle |
Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Lorenzo Calibbi Xabier Marcano Joydeep Roy Z lepton flavour violation as a probe for new physics at future $$e^+e^-$$ e + e - colliders |
| description |
Abstract In this work we assess the potential of discovering new physics by searching for lepton-flavour-violating (LFV) decays of the Z boson, $$Z\rightarrow \ell _i \ell _j$$ Z → ℓ i ℓ j , at the proposed circular $$e^+e^-$$ e + e - colliders CEPC and FCC-ee. Both projects plan to run at the Z-pole as a “Tera Z factory”, i.e., collecting $${\mathcal {O}}\left( 10^{12} \right) $$ O 10 12 Z decays. In order to discuss the discovery potential in a model-independent way, we revisit the LFV Z decays in the context of the Standard Model effective field theory and study the indirect constraints from LFV $$\mu $$ μ and $$\tau $$ τ decays on the operators that can induce $$Z\rightarrow \ell _i \ell _j$$ Z → ℓ i ℓ j . We find that, while the $$Z\rightarrow \mu e$$ Z → μ e rates are beyond the expected sensitivities, a Tera Z factory is promising for $$Z\rightarrow \tau \ell $$ Z → τ ℓ decays, probing New Physics at the same level of future low-energy LFV observables. |
| format |
article |
| author |
Lorenzo Calibbi Xabier Marcano Joydeep Roy |
| author_facet |
Lorenzo Calibbi Xabier Marcano Joydeep Roy |
| author_sort |
Lorenzo Calibbi |
| title |
Z lepton flavour violation as a probe for new physics at future $$e^+e^-$$ e + e - colliders |
| title_short |
Z lepton flavour violation as a probe for new physics at future $$e^+e^-$$ e + e - colliders |
| title_full |
Z lepton flavour violation as a probe for new physics at future $$e^+e^-$$ e + e - colliders |
| title_fullStr |
Z lepton flavour violation as a probe for new physics at future $$e^+e^-$$ e + e - colliders |
| title_full_unstemmed |
Z lepton flavour violation as a probe for new physics at future $$e^+e^-$$ e + e - colliders |
| title_sort |
z lepton flavour violation as a probe for new physics at future $$e^+e^-$$ e + e - colliders |
| publisher |
SpringerOpen |
| publishDate |
2021 |
| url |
https://doaj.org/article/390b0362f1e4471783ffeb34a3c0304b |
| work_keys_str_mv |
AT lorenzocalibbi zleptonflavourviolationasaprobefornewphysicsatfutureeeeecolliders AT xabiermarcano zleptonflavourviolationasaprobefornewphysicsatfutureeeeecolliders AT joydeeproy zleptonflavourviolationasaprobefornewphysicsatfutureeeeecolliders |
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1718372184363106304 |