Abstract
In both Run 1 and Run 2 of the LHC, the CMS collaboration has observed an excess of events in the searches for low-mass Higgs bosons in the diphoton final state at a mass of about 95 GeV. After a recent update of the experimental analysis, in which the full Run 2 data collected at 13 TeV has been included and an improved experimental calibration has been applied, the local significance of the excess amounts to 2.9σ. The presence of this diphoton excess is especially interesting in view of a further excess observed by CMS in ditau final states at a comparable mass and similar local significance. Moreover, an excess of events with about 2σ local significance and consistent with a mass of 95 GeV was observed in LEP searches for a Higgs boson decaying to pairs of bottom quarks. We interpret the CMS diphoton excess in combination with the ditau excess in terms of a pseudoscalar resonance in the CP-conserving two-Higgs-doublet model (2HDM). Furthermore, we discuss the possibility that, if CP-violation is taken into account, a CP-mixed scalar state can in addition describe the LEP result, thus accommodating all three excesses simultaneously. We find that the region of parameter space where both the CMS diphoton and ditau excesses can be fitted is in tension with current constraints from the flavour sector, potentially calling for other new-physics contributions to flavour-physics observables, most notably b → sγ transitions. Additionally, the new source of CP-violation violates electron EDM constraints by about an order of magnitude. We also comment on the compatibility with the recent ATLAS diphoton searches.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
CMS collaboration, Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC, Phys. Lett. B 716 (2012) 30 [arXiv:1207.7235] [INSPIRE].
ATLAS collaboration, Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC, Phys. Lett. B 716 (2012) 1 [arXiv:1207.7214] [INSPIRE].
CMS collaboration, Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at \( \sqrt{s} \) = 8 and 13 TeV, Phys. Lett. B 793 (2019) 320 [arXiv:1811.08459] [INSPIRE].
CMS collaboration, Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, CMS-PAS-HIG-20-002, CERN, Geneva, Switzerland (2023).
S. Gascon-Shotkin, Searches for additional Higgs bosons at low mass, talk at MoriondEW, indico.cern.ch (2023).
CMS collaboration, Searches for additional Higgs bosons and for vector leptoquarks in ττ final states in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, JHEP 07 (2023) 073 [arXiv:2208.02717] [INSPIRE].
LEP Working Group for Higgs boson searches et al. collaborations, Search for the Standard Model Higgs boson at LEP, Phys. Lett. B 565 (2003) 61 [hep-ex/0306033] [INSPIRE].
J. Cao et al., Diphoton signal of the light Higgs boson in natural NMSSM, Phys. Rev. D 95 (2017) 116001 [arXiv:1612.08522] [INSPIRE].
P.J. Fox and N. Weiner, Light signals from a lighter Higgs, JHEP 08 (2018) 025 [arXiv:1710.07649] [INSPIRE].
U. Haisch and A. Malinauskas, Let there be light from a second light Higgs doublet, JHEP 03 (2018) 135 [arXiv:1712.06599] [INSPIRE].
T. Biekötter, S. Heinemeyer and C. Muñoz, Precise prediction for the Higgs-boson masses in the μν SSM, Eur. Phys. J. C 78 (2018) 504 [arXiv:1712.07475] [INSPIRE].
D. Liu, J. Liu, C.E.M. Wagner and X.-P. Wang, A light Higgs at the LHC and the B-anomalies, JHEP 06 (2018) 150 [arXiv:1805.01476] [INSPIRE].
F. Domingo, S. Heinemeyer, S. Paßehr and G. Weiglein, Decays of the neutral Higgs bosons into SM fermions and gauge bosons in the CP-violating NMSSM, Eur. Phys. J. C 78 (2018) 942 [arXiv:1807.06322] [INSPIRE].
J.M. Cline and T. Toma, Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies, Phys. Rev. D 100 (2019) 035023 [arXiv:1906.02175] [INSPIRE].
T. Biekötter, M. Chakraborti and S. Heinemeyer, A 96 GeV Higgs boson in the N2HDM, Eur. Phys. J. C 80 (2020) 2 [arXiv:1903.11661] [INSPIRE].
J. Cao et al., 96 GeV diphoton excess in seesaw extensions of the natural NMSSM, Phys. Rev. D 101 (2020) 055008 [arXiv:1908.07206] [INSPIRE].
T. Biekötter, S. Heinemeyer and G. Weiglein, Mounting evidence for a 95 GeV Higgs boson, JHEP 08 (2022) 201 [arXiv:2203.13180] [INSPIRE].
T. Biekötter, S. Heinemeyer and G. Weiglein, Excesses in the low-mass Higgs-boson search and the W-boson mass measurement, Eur. Phys. J. C 83 (2023) 450 [arXiv:2204.05975] [INSPIRE].
S. Iguro, T. Kitahara and Y. Omura, Scrutinizing the 95–100 GeV di-tau excess in the top associated process, Eur. Phys. J. C 82 (2022) 1053 [arXiv:2205.03187] [INSPIRE].
S. Iguro, T. Kitahara, Y. Omura and H. Zhang, Chasing the two-Higgs doublet model in the di-Higgs boson production, Phys. Rev. D 107 (2023) 075017 [arXiv:2211.00011] [INSPIRE].
T. Biekötter, S. Heinemeyer and G. Weiglein, The CMS di-photon excess at 95 GeV in view of the LHC Run 2 results, Phys. Lett. B 846 (2023) 138217 [arXiv:2303.12018] [INSPIRE].
T. Biekötter, Scalar extensions of the SM and recent experimental anomalies, in the proceedings of the 57th Rencontres de Moriond on electroweak interactions and unified theories, (2023) [arXiv:2304.11439] [INSPIRE].
J.A. Aguilar-Saavedra, H.B. Câmara, F.R. Joaquim and J.F. Seabra, Confronting the 95 GeV excesses within the U(1)′-extended next-to-minimal 2HDM, Phys. Rev. D 108 (2023) 075020 [arXiv:2307.03768] [INSPIRE].
C. Bonilla et al., Fermion mass hierarchy in an extended left-right symmetric model, arXiv:2305.11967 [INSPIRE].
ATLAS collaboration, Search for diphoton resonances in the 66 to 110 GeV mass range using 140 fb−1 of 13 TeV pp collisions collected with the ATLAS detector, ATLAS-CONF-2023-035, CERN, Geneva, Switzerland (2023).
T.D. Lee, A theory of spontaneous T violation, Phys. Rev. D 8 (1973) 1226 [INSPIRE].
H.E. Haber and G.L. Kane, The search for supersymmetry: probing physics beyond the Standard Model, Phys. Rept. 117 (1985) 75 [INSPIRE].
J.E. Kim, Light pseudoscalars, particle physics and cosmology, Phys. Rept. 150 (1987) 1 [INSPIRE].
R.D. Peccei and H.R. Quinn, CP conservation in the presence of instantons, Phys. Rev. Lett. 38 (1977) 1440 [INSPIRE].
G.C. Branco et al., Theory and phenomenology of two-Higgs-doublet models, Phys. Rept. 516 (2012) 1 [arXiv:1106.0034] [INSPIRE].
S. Davidson and H.E. Haber, Basis-independent methods for the two-Higgs-doublet model, Phys. Rev. D 72 (2005) 035004 [Erratum ibid. 72 (2005) 099902] [hep-ph/0504050] [INSPIRE].
S.L. Glashow and S. Weinberg, Natural conservation laws for neutral currents, Phys. Rev. D 15 (1977) 1958 [INSPIRE].
E.A. Paschos, Diagonal neutral currents, Phys. Rev. D 15 (1977) 1966 [INSPIRE].
A. Arbey, F. Mahmoudi, O. Stal and T. Stefaniak, Status of the charged Higgs boson in two Higgs doublet models, Eur. Phys. J. C 78 (2018) 182 [arXiv:1706.07414] [INSPIRE].
T. Enomoto and R. Watanabe, Flavor constraints on the two Higgs doublet models of Z2 symmetric and aligned types, JHEP 05 (2016) 002 [arXiv:1511.05066] [INSPIRE].
J.F. Gunion and H.E. Haber, The CP conserving two Higgs doublet model: the approach to the decoupling limit, Phys. Rev. D 67 (2003) 075019 [hep-ph/0207010] [INSPIRE].
I.F. Ginzburg, M. Krawczyk and P. Osland, Two Higgs doublet models with CP violation, in the proceedings of the International Workshop on Linear Colliders (LCWS 2002), (2002), p. 703 [hep-ph/0211371] [INSPIRE].
W. Khater and P. Osland, CP violation in top quark production at the LHC and two Higgs doublet models, Nucl. Phys. B 661 (2003) 209 [hep-ph/0302004] [INSPIRE].
A.W. El Kaffas, W. Khater, O.M. Ogreid and P. Osland, Consistency of the two Higgs doublet model and CP violation in top production at the LHC, Nucl. Phys. B 775 (2007) 45 [hep-ph/0605142] [INSPIRE].
A.W. El Kaffas, P. Osland and O.M. Ogreid, CP violation, stability and unitarity of the two Higgs doublet model, Nonlin. Phenom. Complex Syst. 10 (2007) 347 [hep-ph/0702097] [INSPIRE].
A. Wahab El Kaffas, P. Osland and O.M. Ogreid, Constraining the two-Higgs-doublet-model parameter space, Phys. Rev. D 76 (2007) 095001 [arXiv:0706.2997] [INSPIRE].
P. Osland, P.N. Pandita and L. Selbuz, Trilinear Higgs couplings in the two Higgs doublet model with CP violation, Phys. Rev. D 78 (2008) 015003 [arXiv:0802.0060] [INSPIRE].
B. Grzadkowski and P. Osland, Tempered two-Higgs-doublet model, Phys. Rev. D 82 (2010) 125026 [arXiv:0910.4068] [INSPIRE].
A. Arhrib, E. Christova, H. Eberl and E. Ginina, CP violation in charged Higgs production and decays in the complex two Higgs doublet model, JHEP 04 (2011) 089 [arXiv:1011.6560] [INSPIRE].
A. Barroso, P.M. Ferreira, R. Santos and J.P. Silva, Probing the scalar-pseudoscalar mixing in the 125 GeV Higgs particle with current data, Phys. Rev. D 86 (2012) 015022 [arXiv:1205.4247] [INSPIRE].
Y.B. Zeldovich, I.Y. Kobzarev and L.B. Okun, Cosmological consequences of the spontaneous breakdown of discrete symmetry, Zh. Eksp. Teor. Fiz. 67 (1974) 3 [INSPIRE].
N.G. Deshpande and E. Ma, Pattern of symmetry breaking with two Higgs doublets, Phys. Rev. D 18 (1978) 2574 [INSPIRE].
I.P. Ivanov, Minkowski space structure of the Higgs potential in 2HDM, Phys. Rev. D 75 (2007) 035001 [Erratum ibid. 76 (2007) 039902] [hep-ph/0609018] [INSPIRE].
I.P. Ivanov, Minkowski space structure of the Higgs potential in 2HDM. II. Minima, symmetries, and topology, Phys. Rev. D 77 (2008) 015017 [arXiv:0710.3490] [INSPIRE].
S. Kanemura and K. Yagyu, Unitarity bound in the most general two Higgs doublet model, Phys. Lett. B 751 (2015) 289 [arXiv:1509.06060] [INSPIRE].
I.F. Ginzburg and I.P. Ivanov, Tree-level unitarity constraints in the most general 2HDM, Phys. Rev. D 72 (2005) 115010 [hep-ph/0508020] [INSPIRE].
H.E. Haber and D. O’Neil, Basis-independent methods for the two-Higgs-doublet model III: the CP-conserving limit, custodial symmetry, and the oblique parameters S, T, U , Phys. Rev. D 83 (2011) 055017 [arXiv:1011.6188] [INSPIRE].
M. Mühlleitner, M.O.P. Sampaio, R. Santos and J. Wittbrodt, ScannerS: parameter scans in extended scalar sectors, Eur. Phys. J. C 82 (2022) 198 [arXiv:2007.02985] [INSPIRE].
H. Bahl et al., HiggsTools: BSM scalar phenomenology with new versions of HiggsBounds and HiggsSignals, Comput. Phys. Commun. 291 (2023) 108803 [arXiv:2210.09332] [INSPIRE].
P. Bechtle et al., HiggsBounds: confronting arbitrary Higgs sectors with exclusion bounds from LEP and the Tevatron, Comput. Phys. Commun. 181 (2010) 138 [arXiv:0811.4169] [INSPIRE].
P. Bechtle et al., HiggsBounds 2.0.0: confronting neutral and charged Higgs sector predictions with exclusion bounds from LEP and the Tevatron, Comput. Phys. Commun. 182 (2011) 2605 [arXiv:1102.1898] [INSPIRE].
P. Bechtle et al., HiggsBounds-4: improved tests of extended Higgs sectors against exclusion bounds from LEP, the Tevatron and the LHC, Eur. Phys. J. C 74 (2014) 2693 [arXiv:1311.0055] [INSPIRE].
P. Bechtle et al., HiggsBounds-5: testing Higgs sectors in the LHC 13 TeV era, Eur. Phys. J. C 80 (2020) 1211 [arXiv:2006.06007] [INSPIRE].
P. Bechtle et al., HiggsSignals: confronting arbitrary Higgs sectors with measurements at the Tevatron and the LHC, Eur. Phys. J. C 74 (2014) 2711 [arXiv:1305.1933] [INSPIRE].
P. Bechtle et al., Probing the Standard Model with Higgs signal rates from the Tevatron, the LHC and a future ILC, JHEP 11 (2014) 039 [arXiv:1403.1582] [INSPIRE].
P. Bechtle et al., HiggsSignals-2: probing new physics with precision Higgs measurements in the LHC 13 TeV era, Eur. Phys. J. C 81 (2021) 145 [arXiv:2012.09197] [INSPIRE].
M. Mühlleitner, M.O.P. Sampaio, R. Santos and J. Wittbrodt, Phenomenological comparison of models with extended Higgs sectors, JHEP 08 (2017) 132 [arXiv:1703.07750] [INSPIRE].
D. Fontes, J.C. Romão and J.P. Silva, h → Zγ in the complex two Higgs doublet model, JHEP 12 (2014) 043 [arXiv:1408.2534] [INSPIRE].
CMS collaboration, Search for new resonances in the diphoton final state in the mass range between 80 and 110 GeV in pp collisions at \( \sqrt{s} \) = 8 TeV, CMS-PAS-HIG-14-037, CERN, Geneva, Switzerland (2015).
ATLAS collaboration, Search for resonances in the 65 to 110 GeV diphoton invariant mass range using 80 fb−1 of pp collisions collected at \( \sqrt{s} \) = 13 TeV with the ATLAS detector, ATLAS-CONF-2018-025, CERN, Geneva, Switzerland (2018).
CMS collaboration, Search for dilepton resonances from decays of (pseudo)scalar bosons produced in association with a massive vector boson or top quark anti-top quark pair at \( \sqrt{s} \) = 13 TeV, CMS-PAS-EXO-21-018, CERN, Geneva, Switzerland (2022).
LEP Working Group for Higgs boson searches et al. collaborations, Search for the Standard Model Higgs boson at LEP, Phys. Lett. B 565 (2003) 61 [hep-ex/0306033] [INSPIRE].
ALEPH et al. collaborations, Search for neutral MSSM Higgs bosons at LEP, Eur. Phys. J. C 47 (2006) 547 [hep-ex/0602042] [INSPIRE].
T. Biekötter and M. Pierre, Higgs-boson visible and invisible constraints on hidden sectors, Eur. Phys. J. C 82 (2022) 1026 [arXiv:2208.05505] [INSPIRE].
ATLAS collaboration, Combined measurements of Higgs boson production and decay using up to 139 fb−1 of proton-proton collision data at \( \sqrt{s} \) = 13 TeV collected with the ATLAS experiment, ATLAS-CONF-2021-053, CERN, Geneva, Switzerland (2021).
T. Biekötter and M.O. Olea-Romacho, Reconciling Higgs physics and pseudo-Nambu-Goldstone dark matter in the S2HDM using a genetic algorithm, JHEP 10 (2021) 215 [arXiv:2108.10864] [INSPIRE].
S. Heinemeyer et al., Phenomenology of a 96 GeV Higgs boson in the 2HDM with an additional singlet, Phys. Rev. D 106 (2022) 075003 [arXiv:2112.11958] [INSPIRE].
CDF collaboration, High-precision measurement of the W boson mass with the CDF II detector, Science 376 (2022) 170 [INSPIRE].
CMS collaboration, Search for a new resonance decaying to two scalars in the final state with two bottom quarks and two photons in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, CMS-PAS-HIG-21-011, CERN, Geneva, Switzerland (2022).
CMS collaboration, Search for a heavy Higgs boson decaying into two lighter Higgs bosons in the ττbb final state at 13 TeV, JHEP 11 (2021) 057 [arXiv:2106.10361] [INSPIRE].
S. Banik, A. Crivellin, S. Iguro and T. Kitahara, Asymmetric di-Higgs signals of the next-to-minimal 2HDM with a U(1) symmetry, Phys. Rev. D 108 (2023) 075011 [arXiv:2303.11351] [INSPIRE].
ATLAS collaboration, Anomaly detection search for new resonances decaying into a Higgs boson and a generic new particle X in hadronic final states using \( \sqrt{s} \) = 13 TeV pp collisions with the ATLAS detector, arXiv:2306.03637 [INSPIRE].
G. Coloretti, A. Crivellin, S. Bhattacharya and B. Mellado, Searching for low-mass resonances decaying into W bosons, Phys. Rev. D 108 (2023) 035026 [arXiv:2302.07276] [INSPIRE].
CMS collaboration, Measurements of the Higgs boson production cross section and couplings in the W boson pair decay channel in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, Eur. Phys. J. C 83 (2023) 667 [arXiv:2206.09466] [INSPIRE].
ATLAS collaboration, Measurements of Higgs boson production by gluon-gluon fusion and vector-boson fusion using H → WW* → eνμν decays in pp collisions at \( \sqrt{s} \) = 13 TeV with the ATLAS detector, Phys. Rev. D 108 (2023) 032005 [arXiv:2207.00338] [INSPIRE].
A. Barroso, P.M. Ferreira, I.P. Ivanov and R. Santos, Metastability bounds on the two Higgs doublet model, JHEP 06 (2013) 045 [arXiv:1303.5098] [INSPIRE].
I.P. Ivanov and J.P. Silva, Tree-level metastability bounds for the most general two Higgs doublet model, Phys. Rev. D 92 (2015) 055017 [arXiv:1507.05100] [INSPIRE].
T. Biekötter et al., The trap in the early universe: impact on the interplay between gravitational waves and LHC physics in the 2HDM, JCAP 03 (2023) 031 [arXiv:2208.14466] [INSPIRE].
Gfitter Group collaboration, The global electroweak fit at NNLO and prospects for the LHC and ILC, Eur. Phys. J. C 74 (2014) 3046 [arXiv:1407.3792] [INSPIRE].
W. Grimus, L. Lavoura, O.M. Ogreid and P. Osland, A precision constraint on multi-Higgs-doublet models, J. Phys. G 35 (2008) 075001 [arXiv:0711.4022] [INSPIRE].
ATLAS and CMS collaborations, Combined measurement of the Higgs boson mass in pp collisions at \( \sqrt{s} \) = 7 and 8 TeV with the ATLAS and CMS experiments, Phys. Rev. Lett. 114 (2015) 191803 [arXiv:1503.07589] [INSPIRE].
O. Deschamps et al., The two Higgs doublet of type II facing flavour physics data, Phys. Rev. D 82 (2010) 073012 [arXiv:0907.5135] [INSPIRE].
F. Mahmoudi and O. Stal, Flavor constraints on the two-Higgs-doublet model with general Yukawa couplings, Phys. Rev. D 81 (2010) 035016 [arXiv:0907.1791] [INSPIRE].
T. Hermann, M. Misiak and M. Steinhauser, \( \overline{B} \) → Xsγ in the two Higgs doublet model up to next-to-next-to-leading order in QCD, JHEP 11 (2012) 036 [arXiv:1208.2788] [INSPIRE].
M. Misiak et al., Updated NNLO QCD predictions for the weak radiative B-meson decays, Phys. Rev. Lett. 114 (2015) 221801 [arXiv:1503.01789] [INSPIRE].
M. Misiak and M. Steinhauser, Weak radiative decays of the B meson and bounds on \( {M}_{H^{\pm }} \) in the two-Higgs-doublet model, Eur. Phys. J. C 77 (2017) 201 [arXiv:1702.04571] [INSPIRE].
M. Misiak, A. Rehman and M. Steinhauser, Towards \( \overline{B} \) → Xsγ at the NNLO in QCD without interpolation in mc, JHEP 06 (2020) 175 [arXiv:2002.01548] [INSPIRE].
LHC Higgs Cross Section Working Group collaboration, Handbook of LHC Higgs cross sections: 4. Deciphering the nature of the Higgs sector, arXiv:1610.07922 [https://doi.org/10.23731/CYRM-2017-002] [INSPIRE].
A. Djouadi, J. Kalinowski and M. Spira, HDECAY: a program for Higgs boson decays in the Standard Model and its supersymmetric extension, Comput. Phys. Commun. 108 (1998) 56 [hep-ph/9704448] [INSPIRE].
R.A. Battye, A. Pilaftsis and D.G. Viatic, Domain wall constraints on two-Higgs-doublet models with Z2 symmetry, Phys. Rev. D 102 (2020) 123536 [arXiv:2010.09840] [INSPIRE].
ATLAS collaboration, Search for charged Higgs bosons decaying into a top quark and a bottom quark at \( \sqrt{s} \) = 13 TeV with the ATLAS detector, JHEP 06 (2021) 145 [arXiv:2102.10076] [INSPIRE].
CMS collaboration, Search for charged Higgs bosons decaying into a top and a bottom quark in the all-jet final state of pp collisions at \( \sqrt{s} \) = 13 TeV, JHEP 07 (2020) 126 [arXiv:2001.07763] [INSPIRE].
H. Bahl, T. Stefaniak and J. Wittbrodt, The forgotten channels: charged Higgs boson decays to a W± and a non-SM-like Higgs boson, JHEP 06 (2021) 183 [arXiv:2103.07484] [INSPIRE].
ATLAS collaboration, Search for charged Higgs bosons decaying via H± → τ±ν in the τ+jets and τ+lepton final states with 36 fb−1 of pp collision data recorded at \( \sqrt{s} \) = 13 TeV with the ATLAS experiment, JHEP 09 (2018) 139 [arXiv:1807.07915] [INSPIRE].
CMS collaboration, Search for a new scalar resonance decaying to a pair of Z bosons in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, JHEP 06 (2018) 127 [Erratum ibid. 03 (2019) 128] [arXiv:1804.01939] [INSPIRE].
CMS collaboration, Search for neutral resonances decaying into a Z boson and a pair of b jets or τ leptons, Phys. Lett. B 759 (2016) 369 [arXiv:1603.02991] [INSPIRE].
CMS collaboration, Search for new neutral Higgs bosons through the H → ZA → ℓ+ℓ−\( b\overline{b} \) process in pp collisions at \( \sqrt{s} \) = 13 TeV, JHEP 03 (2020) 055 [arXiv:1911.03781] [INSPIRE].
ATLAS collaboration, Search for heavy Higgs bosons decaying into two tau leptons with the ATLAS detector using pp collisions at \( \sqrt{s} \) = 13 TeV, Phys. Rev. Lett. 125 (2020) 051801 [arXiv:2002.12223] [INSPIRE].
CMS collaboration, Search for additional neutral MSSM Higgs bosons in the ττ final state in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, JHEP 09 (2018) 007 [arXiv:1803.06553] [INSPIRE].
F. Borzumati and C. Greub, 2HDMs predictions for \( \overline{B} \) → Xsγ in NLO QCD, Phys. Rev. D 58 (1998) 074004 [hep-ph/9802391] [INSPIRE].
F. Borzumati and C. Greub, Two Higgs doublet model predictions for \( \overline{B} \) → Xsγ in NLO QCD: addendum, Phys. Rev. D 59 (1999) 057501 [hep-ph/9809438] [INSPIRE].
F. Mahmoudi, SuperIso: a program for calculating the isospin asymmetry of B → K*γ in the MSSM, Comput. Phys. Commun. 178 (2008) 745 [arXiv:0710.2067] [INSPIRE].
F. Mahmoudi, SuperIso v2.3: a program for calculating flavor physics observables in supersymmetry, Comput. Phys. Commun. 180 (2009) 1579 [arXiv:0808.3144] [INSPIRE].
HFLAV collaboration, Averages of b-hadron, c-hadron, and τ-lepton properties as of 2021, Phys. Rev. D 107 (2023) 052008 [arXiv:2206.07501] [INSPIRE].
M. Jung and A. Pich, Electric dipole moments in two-Higgs-doublet models, JHEP 04 (2014) 076 [arXiv:1308.6283] [INSPIRE].
CMS collaboration, Analysis of the CP structure of the Yukawa coupling between the Higgs boson and τ leptons in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, JHEP 06 (2022) 012 [arXiv:2110.04836] [INSPIRE].
ATLAS collaboration, Measurement of the CP properties of Higgs boson interactions with τ-leptons with the ATLAS detector, Eur. Phys. J. C 83 (2023) 563 [arXiv:2212.05833] [INSPIRE].
D. Fontes et al., The C2HDM revisited, JHEP 02 (2018) 073 [arXiv:1711.09419] [INSPIRE].
T. Abe, J. Hisano, T. Kitahara and K. Tobioka, Gauge invariant Barr-Zee type contributions to fermionic EDMs in the two-Higgs doublet models, JHEP 01 (2014) 106 [Erratum ibid. 04 (2016) 161] [arXiv:1311.4704] [INSPIRE].
T.S. Roussy et al., An improved bound on the electron’s electric dipole moment, Science 381 (2023) adg4084 [arXiv:2212.11841] [INSPIRE].
C. Cesarotti et al., Interpreting the electron EDM constraint, JHEP 05 (2019) 059 [arXiv:1810.07736] [INSPIRE].
K. Fuyuto, W.-S. Hou and E. Senaha, Cancellation mechanism for the electron electric dipole moment connected with the baryon asymmetry of the universe, Phys. Rev. D 101 (2020) 011901 [arXiv:1910.12404] [INSPIRE].
Acknowledgments
The authors thank Georg Weiglein for bringing ref. [77] to our attention. T.B. thanks Daniel Winterbottom for interesting discussions. P.M.F. is supported by Fundação para a Ciência e a Tecnologia (FCT) through contracts UIDB/00618/2020, UIDP/00618/2020, CERN/FIS-PAR/0004/2019, CERN/FIS-PAR/0014/2019 and CERN/FIS-PAR/0025/2021. The work of T.B. is supported by the German Bundesministerium für Bildung und Forschung (BMBF, Federal Ministry of Education and Research) — project 05H21VKCCA. D.A. is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under grant 396021762 — TRR 257.
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
ArXiv ePrint: 2305.19716
Rights and permissions
Open Access . This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
About this article
Cite this article
Azevedo, D., Biekötter, T. & Ferreira, P.M. 2HDM interpretations of the CMS diphoton excess at 95 GeV. J. High Energ. Phys. 2023, 17 (2023). https://doi.org/10.1007/JHEP11(2023)017
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP11(2023)017