The cost of an ALP solution to the neutral B-anomalies

Abstract The neutral anomalies in B decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to RK and to the...
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Autor*in:	Bonilla, J. [verfasserIn] de Giorgi, A. Gavela, B. Merlo, L. Ramos, M.

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Axions and ALPs Bottom Quarks Lepton Flavour Violation (charged) Semi-Leptonic Decays

Anmerkung:	© The Author(s) 2023

Übergeordnetes Werk:	Enthalten in: Journal of high energy physics - Berlin : Springer, 1997, 2023(2023), 2 vom: 14. Feb.
Übergeordnetes Werk:	volume:2023 ; year:2023 ; number:2 ; day:14 ; month:02

Links:	Volltext

DOI / URN:	10.1007/JHEP02(2023)138

Katalog-ID:	SPR049674390

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520			\|a Abstract The neutral anomalies in B decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to RK and to the two energy bins of %$ {R}_{K^{\ast }} %$ are confronted with the impact of ALP exchange on other observables (meson oscillations, leptonic and semileptonic decays of B mesons including searches for new resonances, astrophysical constraints), as well as with the theoretical domain of validity of the effective theory. Solutions based on ALPs heavier than B mesons, or lighter than twice the muon mass, are shown to be excluded. In contrast, the exchange of on-shell ALPs provides solutions to RK and/or %$ {R}_{K^{\ast }} %$ within 2σ sensitivity which are technically compatible with those constraints. Furthermore, a “golden ALP mass” is identified at the frontier between the two energy bin windows of %$ {R}_{K^{\ast }} %$, which could simultaneously explain these two %$ {R}_{K^{\ast }} %$ anomalies together with RK; this calls for the convenience of different energy binning which would easily clear up this (unlikely) possibility. The impact of smearing on data analysis is also discussed. When loop effects are taken into account, the solutions found can be in addition compatible with the data on the g − 2 of the electron but not simultaneously with those on the g − 2 of the muon. Furthermore, loop effects may require fine-tunings of some coupling values.
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allfields	10.1007/JHEP02(2023)138 doi (DE-627)SPR049674390 (SPR)JHEP02(2023)138-e DE-627 ger DE-627 rakwb eng Bonilla, J. verfasserin (orcid)0000-0001-7621-0248 aut The cost of an ALP solution to the neutral B-anomalies 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2023 Abstract The neutral anomalies in B decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to RK and to the two energy bins of %$ {R}_{K^{\ast }} %$ are confronted with the impact of ALP exchange on other observables (meson oscillations, leptonic and semileptonic decays of B mesons including searches for new resonances, astrophysical constraints), as well as with the theoretical domain of validity of the effective theory. Solutions based on ALPs heavier than B mesons, or lighter than twice the muon mass, are shown to be excluded. In contrast, the exchange of on-shell ALPs provides solutions to RK and/or %$ {R}_{K^{\ast }} %$ within 2σ sensitivity which are technically compatible with those constraints. Furthermore, a “golden ALP mass” is identified at the frontier between the two energy bin windows of %$ {R}_{K^{\ast }} %$, which could simultaneously explain these two %$ {R}_{K^{\ast }} %$ anomalies together with RK; this calls for the convenience of different energy binning which would easily clear up this (unlikely) possibility. The impact of smearing on data analysis is also discussed. When loop effects are taken into account, the solutions found can be in addition compatible with the data on the g − 2 of the electron but not simultaneously with those on the g − 2 of the muon. Furthermore, loop effects may require fine-tunings of some coupling values. Axions and ALPs (dpeaa)DE-He213 Bottom Quarks (dpeaa)DE-He213 Lepton Flavour Violation (charged) (dpeaa)DE-He213 Semi-Leptonic Decays (dpeaa)DE-He213 de Giorgi, A. aut Gavela, B. aut Merlo, L. aut Ramos, M. aut Enthalten in Journal of high energy physics Berlin : Springer, 1997 2023(2023), 2 vom: 14. Feb. (DE-627)320910571 (DE-600)2027350-2 1029-8479 nnns volume:2023 year:2023 number:2 day:14 month:02 https://dx.doi.org/10.1007/JHEP02(2023)138 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2020 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 2023 2023 2 14 02
spelling	10.1007/JHEP02(2023)138 doi (DE-627)SPR049674390 (SPR)JHEP02(2023)138-e DE-627 ger DE-627 rakwb eng Bonilla, J. verfasserin (orcid)0000-0001-7621-0248 aut The cost of an ALP solution to the neutral B-anomalies 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2023 Abstract The neutral anomalies in B decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to RK and to the two energy bins of %$ {R}_{K^{\ast }} %$ are confronted with the impact of ALP exchange on other observables (meson oscillations, leptonic and semileptonic decays of B mesons including searches for new resonances, astrophysical constraints), as well as with the theoretical domain of validity of the effective theory. Solutions based on ALPs heavier than B mesons, or lighter than twice the muon mass, are shown to be excluded. In contrast, the exchange of on-shell ALPs provides solutions to RK and/or %$ {R}_{K^{\ast }} %$ within 2σ sensitivity which are technically compatible with those constraints. Furthermore, a “golden ALP mass” is identified at the frontier between the two energy bin windows of %$ {R}_{K^{\ast }} %$, which could simultaneously explain these two %$ {R}_{K^{\ast }} %$ anomalies together with RK; this calls for the convenience of different energy binning which would easily clear up this (unlikely) possibility. The impact of smearing on data analysis is also discussed. When loop effects are taken into account, the solutions found can be in addition compatible with the data on the g − 2 of the electron but not simultaneously with those on the g − 2 of the muon. Furthermore, loop effects may require fine-tunings of some coupling values. Axions and ALPs (dpeaa)DE-He213 Bottom Quarks (dpeaa)DE-He213 Lepton Flavour Violation (charged) (dpeaa)DE-He213 Semi-Leptonic Decays (dpeaa)DE-He213 de Giorgi, A. aut Gavela, B. aut Merlo, L. aut Ramos, M. aut Enthalten in Journal of high energy physics Berlin : Springer, 1997 2023(2023), 2 vom: 14. Feb. (DE-627)320910571 (DE-600)2027350-2 1029-8479 nnns volume:2023 year:2023 number:2 day:14 month:02 https://dx.doi.org/10.1007/JHEP02(2023)138 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2020 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 2023 2023 2 14 02
allfields_unstemmed	10.1007/JHEP02(2023)138 doi (DE-627)SPR049674390 (SPR)JHEP02(2023)138-e DE-627 ger DE-627 rakwb eng Bonilla, J. verfasserin (orcid)0000-0001-7621-0248 aut The cost of an ALP solution to the neutral B-anomalies 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2023 Abstract The neutral anomalies in B decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to RK and to the two energy bins of %$ {R}_{K^{\ast }} %$ are confronted with the impact of ALP exchange on other observables (meson oscillations, leptonic and semileptonic decays of B mesons including searches for new resonances, astrophysical constraints), as well as with the theoretical domain of validity of the effective theory. Solutions based on ALPs heavier than B mesons, or lighter than twice the muon mass, are shown to be excluded. In contrast, the exchange of on-shell ALPs provides solutions to RK and/or %$ {R}_{K^{\ast }} %$ within 2σ sensitivity which are technically compatible with those constraints. Furthermore, a “golden ALP mass” is identified at the frontier between the two energy bin windows of %$ {R}_{K^{\ast }} %$, which could simultaneously explain these two %$ {R}_{K^{\ast }} %$ anomalies together with RK; this calls for the convenience of different energy binning which would easily clear up this (unlikely) possibility. The impact of smearing on data analysis is also discussed. When loop effects are taken into account, the solutions found can be in addition compatible with the data on the g − 2 of the electron but not simultaneously with those on the g − 2 of the muon. Furthermore, loop effects may require fine-tunings of some coupling values. Axions and ALPs (dpeaa)DE-He213 Bottom Quarks (dpeaa)DE-He213 Lepton Flavour Violation (charged) (dpeaa)DE-He213 Semi-Leptonic Decays (dpeaa)DE-He213 de Giorgi, A. aut Gavela, B. aut Merlo, L. aut Ramos, M. aut Enthalten in Journal of high energy physics Berlin : Springer, 1997 2023(2023), 2 vom: 14. Feb. (DE-627)320910571 (DE-600)2027350-2 1029-8479 nnns volume:2023 year:2023 number:2 day:14 month:02 https://dx.doi.org/10.1007/JHEP02(2023)138 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2020 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 2023 2023 2 14 02
allfieldsGer	10.1007/JHEP02(2023)138 doi (DE-627)SPR049674390 (SPR)JHEP02(2023)138-e DE-627 ger DE-627 rakwb eng Bonilla, J. verfasserin (orcid)0000-0001-7621-0248 aut The cost of an ALP solution to the neutral B-anomalies 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2023 Abstract The neutral anomalies in B decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to RK and to the two energy bins of %$ {R}_{K^{\ast }} %$ are confronted with the impact of ALP exchange on other observables (meson oscillations, leptonic and semileptonic decays of B mesons including searches for new resonances, astrophysical constraints), as well as with the theoretical domain of validity of the effective theory. Solutions based on ALPs heavier than B mesons, or lighter than twice the muon mass, are shown to be excluded. In contrast, the exchange of on-shell ALPs provides solutions to RK and/or %$ {R}_{K^{\ast }} %$ within 2σ sensitivity which are technically compatible with those constraints. Furthermore, a “golden ALP mass” is identified at the frontier between the two energy bin windows of %$ {R}_{K^{\ast }} %$, which could simultaneously explain these two %$ {R}_{K^{\ast }} %$ anomalies together with RK; this calls for the convenience of different energy binning which would easily clear up this (unlikely) possibility. The impact of smearing on data analysis is also discussed. When loop effects are taken into account, the solutions found can be in addition compatible with the data on the g − 2 of the electron but not simultaneously with those on the g − 2 of the muon. Furthermore, loop effects may require fine-tunings of some coupling values. Axions and ALPs (dpeaa)DE-He213 Bottom Quarks (dpeaa)DE-He213 Lepton Flavour Violation (charged) (dpeaa)DE-He213 Semi-Leptonic Decays (dpeaa)DE-He213 de Giorgi, A. aut Gavela, B. aut Merlo, L. aut Ramos, M. aut Enthalten in Journal of high energy physics Berlin : Springer, 1997 2023(2023), 2 vom: 14. Feb. (DE-627)320910571 (DE-600)2027350-2 1029-8479 nnns volume:2023 year:2023 number:2 day:14 month:02 https://dx.doi.org/10.1007/JHEP02(2023)138 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2020 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 2023 2023 2 14 02
allfieldsSound	10.1007/JHEP02(2023)138 doi (DE-627)SPR049674390 (SPR)JHEP02(2023)138-e DE-627 ger DE-627 rakwb eng Bonilla, J. verfasserin (orcid)0000-0001-7621-0248 aut The cost of an ALP solution to the neutral B-anomalies 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2023 Abstract The neutral anomalies in B decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to RK and to the two energy bins of %$ {R}_{K^{\ast }} %$ are confronted with the impact of ALP exchange on other observables (meson oscillations, leptonic and semileptonic decays of B mesons including searches for new resonances, astrophysical constraints), as well as with the theoretical domain of validity of the effective theory. Solutions based on ALPs heavier than B mesons, or lighter than twice the muon mass, are shown to be excluded. In contrast, the exchange of on-shell ALPs provides solutions to RK and/or %$ {R}_{K^{\ast }} %$ within 2σ sensitivity which are technically compatible with those constraints. Furthermore, a “golden ALP mass” is identified at the frontier between the two energy bin windows of %$ {R}_{K^{\ast }} %$, which could simultaneously explain these two %$ {R}_{K^{\ast }} %$ anomalies together with RK; this calls for the convenience of different energy binning which would easily clear up this (unlikely) possibility. The impact of smearing on data analysis is also discussed. When loop effects are taken into account, the solutions found can be in addition compatible with the data on the g − 2 of the electron but not simultaneously with those on the g − 2 of the muon. Furthermore, loop effects may require fine-tunings of some coupling values. Axions and ALPs (dpeaa)DE-He213 Bottom Quarks (dpeaa)DE-He213 Lepton Flavour Violation (charged) (dpeaa)DE-He213 Semi-Leptonic Decays (dpeaa)DE-He213 de Giorgi, A. aut Gavela, B. aut Merlo, L. aut Ramos, M. aut Enthalten in Journal of high energy physics Berlin : Springer, 1997 2023(2023), 2 vom: 14. Feb. (DE-627)320910571 (DE-600)2027350-2 1029-8479 nnns volume:2023 year:2023 number:2 day:14 month:02 https://dx.doi.org/10.1007/JHEP02(2023)138 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2020 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 2023 2023 2 14 02
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source	Enthalten in Journal of high energy physics 2023(2023), 2 vom: 14. Feb. volume:2023 year:2023 number:2 day:14 month:02
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author	Bonilla, J.
spellingShingle	Bonilla, J. misc Axions and ALPs misc Bottom Quarks misc Lepton Flavour Violation (charged) misc Semi-Leptonic Decays The cost of an ALP solution to the neutral B-anomalies
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topic_title	The cost of an ALP solution to the neutral B-anomalies Axions and ALPs (dpeaa)DE-He213 Bottom Quarks (dpeaa)DE-He213 Lepton Flavour Violation (charged) (dpeaa)DE-He213 Semi-Leptonic Decays (dpeaa)DE-He213
topic	misc Axions and ALPs misc Bottom Quarks misc Lepton Flavour Violation (charged) misc Semi-Leptonic Decays
topic_unstemmed	misc Axions and ALPs misc Bottom Quarks misc Lepton Flavour Violation (charged) misc Semi-Leptonic Decays
topic_browse	misc Axions and ALPs misc Bottom Quarks misc Lepton Flavour Violation (charged) misc Semi-Leptonic Decays
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title	The cost of an ALP solution to the neutral B-anomalies
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title_full	The cost of an ALP solution to the neutral B-anomalies
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title_sort	cost of an alp solution to the neutral b-anomalies
title_auth	The cost of an ALP solution to the neutral B-anomalies
abstract	Abstract The neutral anomalies in B decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to RK and to the two energy bins of %$ {R}_{K^{\ast }} %$ are confronted with the impact of ALP exchange on other observables (meson oscillations, leptonic and semileptonic decays of B mesons including searches for new resonances, astrophysical constraints), as well as with the theoretical domain of validity of the effective theory. Solutions based on ALPs heavier than B mesons, or lighter than twice the muon mass, are shown to be excluded. In contrast, the exchange of on-shell ALPs provides solutions to RK and/or %$ {R}_{K^{\ast }} %$ within 2σ sensitivity which are technically compatible with those constraints. Furthermore, a “golden ALP mass” is identified at the frontier between the two energy bin windows of %$ {R}_{K^{\ast }} %$, which could simultaneously explain these two %$ {R}_{K^{\ast }} %$ anomalies together with RK; this calls for the convenience of different energy binning which would easily clear up this (unlikely) possibility. The impact of smearing on data analysis is also discussed. When loop effects are taken into account, the solutions found can be in addition compatible with the data on the g − 2 of the electron but not simultaneously with those on the g − 2 of the muon. Furthermore, loop effects may require fine-tunings of some coupling values. © The Author(s) 2023
abstractGer	Abstract The neutral anomalies in B decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to RK and to the two energy bins of %$ {R}_{K^{\ast }} %$ are confronted with the impact of ALP exchange on other observables (meson oscillations, leptonic and semileptonic decays of B mesons including searches for new resonances, astrophysical constraints), as well as with the theoretical domain of validity of the effective theory. Solutions based on ALPs heavier than B mesons, or lighter than twice the muon mass, are shown to be excluded. In contrast, the exchange of on-shell ALPs provides solutions to RK and/or %$ {R}_{K^{\ast }} %$ within 2σ sensitivity which are technically compatible with those constraints. Furthermore, a “golden ALP mass” is identified at the frontier between the two energy bin windows of %$ {R}_{K^{\ast }} %$, which could simultaneously explain these two %$ {R}_{K^{\ast }} %$ anomalies together with RK; this calls for the convenience of different energy binning which would easily clear up this (unlikely) possibility. The impact of smearing on data analysis is also discussed. When loop effects are taken into account, the solutions found can be in addition compatible with the data on the g − 2 of the electron but not simultaneously with those on the g − 2 of the muon. Furthermore, loop effects may require fine-tunings of some coupling values. © The Author(s) 2023
abstract_unstemmed	Abstract The neutral anomalies in B decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to RK and to the two energy bins of %$ {R}_{K^{\ast }} %$ are confronted with the impact of ALP exchange on other observables (meson oscillations, leptonic and semileptonic decays of B mesons including searches for new resonances, astrophysical constraints), as well as with the theoretical domain of validity of the effective theory. Solutions based on ALPs heavier than B mesons, or lighter than twice the muon mass, are shown to be excluded. In contrast, the exchange of on-shell ALPs provides solutions to RK and/or %$ {R}_{K^{\ast }} %$ within 2σ sensitivity which are technically compatible with those constraints. Furthermore, a “golden ALP mass” is identified at the frontier between the two energy bin windows of %$ {R}_{K^{\ast }} %$, which could simultaneously explain these two %$ {R}_{K^{\ast }} %$ anomalies together with RK; this calls for the convenience of different energy binning which would easily clear up this (unlikely) possibility. The impact of smearing on data analysis is also discussed. When loop effects are taken into account, the solutions found can be in addition compatible with the data on the g − 2 of the electron but not simultaneously with those on the g − 2 of the muon. Furthermore, loop effects may require fine-tunings of some coupling values. © The Author(s) 2023
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title_short	The cost of an ALP solution to the neutral B-anomalies
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The cost of an ALP solution to the neutral B-anomalies

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