A global analysis of $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ data in heavy and light $$Z'$$ Z ′ models
Abstract We perform a model-independent global fit to all $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ data in the light of recent measurements of the lepton flavour universality violating (LFUV) observables $$R_{K_S^0}$$ R K S 0 , $$R_{K^{*+}}$$ R K ∗ + , and the updated observables in $$B_s \rightarro...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-10-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-022-10816-w |
| _version_ | 1811335217428824064 |
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| author | Ashutosh Kumar Alok Neetu Raj Singh Chundawat Shireen Gangal Dinesh Kumar |
| author_facet | Ashutosh Kumar Alok Neetu Raj Singh Chundawat Shireen Gangal Dinesh Kumar |
| author_sort | Ashutosh Kumar Alok |
| collection | DOAJ |
| description | Abstract We perform a model-independent global fit to all $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ data in the light of recent measurements of the lepton flavour universality violating (LFUV) observables $$R_{K_S^0}$$ R K S 0 , $$R_{K^{*+}}$$ R K ∗ + , and the updated observables in $$B_s \rightarrow \phi \mu ^+ \mu ^-$$ B s → ϕ μ + μ - decay, by the LHCb collaboration. Assuming NP only in the muon sector, we find that the 1D NP scenarios $$C_9^{\textrm{NP}} <0 $$ C 9 NP < 0 and $$C_{9}^{\textrm{NP}}=-C_{10}^{\textrm{NP}}$$ C 9 NP = - C 10 NP continue to be the most favoured ones. However, the significance of the favoured scenario $$C_{9}^{\textrm{NP}}=-C'_{9}$$ C 9 NP = - C 9 ′ has reduced and the updated data now marginally prefers $$C_{10}^{\textrm{NP}} > 0$$ C 10 NP > 0 scenario. The 2D scenarios $$(C_9^{\textrm{NP}}, C_{10}^{\prime } )$$ ( C 9 NP , C 10 ′ ) , $$(C_9^{\textrm{NP}}, C_{9}^{\prime } )$$ ( C 9 NP , C 9 ′ ) and $$(C_9^{\textrm{NP}}, C_{10}^{\textrm{NP}} )$$ ( C 9 NP , C 10 NP ) , continue to be favoured by the data in the listed order. We analyse generic TeV scale $$Z'$$ Z ′ models which can generate the 1D scenarios, $$C_9^{\textrm{NP}} <0 $$ C 9 NP < 0 and $$C_9^{\textrm{NP}} = -C_{10}^{\textrm{NP}}$$ C 9 NP = - C 10 NP as well as 2D scenarios $$(C_9^{\textrm{NP}}, C_{9}^{\prime } )$$ ( C 9 NP , C 9 ′ ) and $$(C_9^{\textrm{NP}}, C_{10}^{\textrm{NP}} )$$ ( C 9 NP , C 10 NP ) . We find that all four models provide an equally good fit to the data. We also consider a model with a 25 MeV $$Z'$$ Z ′ that couples to muons only and has a $$q^2$$ q 2 dependent $$b - s$$ b - s coupling. We study the implications of the current data on the LFUV observables $$R_{\phi }$$ R ϕ , $$Q_{4,5}$$ Q 4 , 5 as well as $$R_{K^{(*)}}$$ R K ( ∗ ) in the high $$q^2$$ q 2 . We find that the $$Q_{4,5}$$ Q 4 , 5 observables have a potential to discriminate between a few favored solutions, and disentangle different heavy and light $$Z'$$ Z ′ scenarios. |
| first_indexed | 2024-04-13T17:20:52Z |
| format | Article |
| id | doaj.art-e6857cee75414b66986ef011aadb4675 |
| institution | Directory Open Access Journal |
| issn | 1434-6052 |
| language | English |
| last_indexed | 2024-04-13T17:20:52Z |
| publishDate | 2022-10-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-e6857cee75414b66986ef011aadb46752022-12-22T02:38:00ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522022-10-01821011410.1140/epjc/s10052-022-10816-wA global analysis of $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ data in heavy and light $$Z'$$ Z ′ modelsAshutosh Kumar Alok0Neetu Raj Singh Chundawat1Shireen Gangal2Dinesh Kumar3Indian Institute of Technology JodhpurIndian Institute of Technology JodhpurLAPTh, Universite Savoie Mont-Blanc et CNRSDepartment of Physics, University of RajasthanAbstract We perform a model-independent global fit to all $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ data in the light of recent measurements of the lepton flavour universality violating (LFUV) observables $$R_{K_S^0}$$ R K S 0 , $$R_{K^{*+}}$$ R K ∗ + , and the updated observables in $$B_s \rightarrow \phi \mu ^+ \mu ^-$$ B s → ϕ μ + μ - decay, by the LHCb collaboration. Assuming NP only in the muon sector, we find that the 1D NP scenarios $$C_9^{\textrm{NP}} <0 $$ C 9 NP < 0 and $$C_{9}^{\textrm{NP}}=-C_{10}^{\textrm{NP}}$$ C 9 NP = - C 10 NP continue to be the most favoured ones. However, the significance of the favoured scenario $$C_{9}^{\textrm{NP}}=-C'_{9}$$ C 9 NP = - C 9 ′ has reduced and the updated data now marginally prefers $$C_{10}^{\textrm{NP}} > 0$$ C 10 NP > 0 scenario. The 2D scenarios $$(C_9^{\textrm{NP}}, C_{10}^{\prime } )$$ ( C 9 NP , C 10 ′ ) , $$(C_9^{\textrm{NP}}, C_{9}^{\prime } )$$ ( C 9 NP , C 9 ′ ) and $$(C_9^{\textrm{NP}}, C_{10}^{\textrm{NP}} )$$ ( C 9 NP , C 10 NP ) , continue to be favoured by the data in the listed order. We analyse generic TeV scale $$Z'$$ Z ′ models which can generate the 1D scenarios, $$C_9^{\textrm{NP}} <0 $$ C 9 NP < 0 and $$C_9^{\textrm{NP}} = -C_{10}^{\textrm{NP}}$$ C 9 NP = - C 10 NP as well as 2D scenarios $$(C_9^{\textrm{NP}}, C_{9}^{\prime } )$$ ( C 9 NP , C 9 ′ ) and $$(C_9^{\textrm{NP}}, C_{10}^{\textrm{NP}} )$$ ( C 9 NP , C 10 NP ) . We find that all four models provide an equally good fit to the data. We also consider a model with a 25 MeV $$Z'$$ Z ′ that couples to muons only and has a $$q^2$$ q 2 dependent $$b - s$$ b - s coupling. We study the implications of the current data on the LFUV observables $$R_{\phi }$$ R ϕ , $$Q_{4,5}$$ Q 4 , 5 as well as $$R_{K^{(*)}}$$ R K ( ∗ ) in the high $$q^2$$ q 2 . We find that the $$Q_{4,5}$$ Q 4 , 5 observables have a potential to discriminate between a few favored solutions, and disentangle different heavy and light $$Z'$$ Z ′ scenarios.https://doi.org/10.1140/epjc/s10052-022-10816-w |
| spellingShingle | Ashutosh Kumar Alok Neetu Raj Singh Chundawat Shireen Gangal Dinesh Kumar A global analysis of $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ data in heavy and light $$Z'$$ Z ′ models European Physical Journal C: Particles and Fields |
| title | A global analysis of $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ data in heavy and light $$Z'$$ Z ′ models |
| title_full | A global analysis of $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ data in heavy and light $$Z'$$ Z ′ models |
| title_fullStr | A global analysis of $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ data in heavy and light $$Z'$$ Z ′ models |
| title_full_unstemmed | A global analysis of $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ data in heavy and light $$Z'$$ Z ′ models |
| title_short | A global analysis of $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ data in heavy and light $$Z'$$ Z ′ models |
| title_sort | global analysis of b rightarrow s ell ell b s l l data in heavy and light z z models |
| url | https://doi.org/10.1140/epjc/s10052-022-10816-w |
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