44
2 Phenomenology of the Massless Dark Photon
52. E. Gabrielli, L. Marzola, M. Raidal, Radiative Yukawa couplings in the simplest left-right
symmetric model. Phys. Rev. D95(3), 035005 (2017). arXiv:1611.00009 [hep-ph]. https://doi.
org/10.1103/PhysRevD.95.035005
53. E. Gabrielli, B. Mele, M. Raidal, E. Venturini, FCNC decays of standard model fermions into a
dark photon. Phys. Rev. D94(11), 115013 (2016). arXiv:1607.05928 [hep-ph]. https://doi.org/
10.1103/PhysRevD.94.115013
54. J.T. Acuña, M. Fabbrichesi, P. Ullio, Phenomenological Consequences of an Interacting Multicomponent Dark Sector. arXiv:2005.04146 [hep-ph]
55. ATLAS Collaboration, M. Aaboud et al., Search for squarks and gluinos in final states with
jets and missing transverse momentum using 36 fb −1 of
√
s = 13 TeV pp collision data with
the ATLAS detector. Phys. Rev. D97(11), 112001 (2018). arXiv:1712.02332 [hep-ex]. https://
doi.org/10.1103/PhysRevD.97.112001
56. D. Barducci, M. Fabbrichesi, E. Gabrielli, Neutral Hadrons disappearing into the darkness.
Phys. Rev. D98 (3), 035049 (2018). arXiv:1806.05678 [hep-ph]. https://doi.org/10.1103/
PhysRevD.98.035049
57. CMS Collaboration, A.M. Sirunyan et al., Search for supersymmetric partners of electrons
and muons in proton-proton collisions at
√
s = 13 TeV. Phys. Lett. B790, 140–166 (2019).
arXiv:1806.05264 [hep-ex]. https://doi.org/10.1016/j.physletb.2019.01.005
58. MEG Collaboration, A. Baldini et al., Search for the lepton flavour violating decay μ + →
e + with the full dataset of the MEG experiment. Eur. Phys. J. C 76(8), 434 (2016).
arXiv:1605.05081 [hep-ex]. https://doi.org/10.1140/epjc/s10052-016-4271-x
59. BaBar Collaboration, J. Lees et al., Precision measurement of the B → X s γ photon energy
spectrum, branching fraction, and direct CP asymmetry A C P (B → X s+d γ). Phys. Rev. Lett.
109, 191801 (2012). https://doi.org/10.1103/PhysRevLett.109.191801. arXiv:1207.2690 [hepex]
60. M. Misiak et al., Estimate of B( ¯
B → X s γ) at O(α 2
s ). Phys. Rev. Lett. 98, 022002 (2007).
https://doi.org/10.1103/PhysRevLett.98.022002. arXiv:hep-ph/0609232
61. M. Fabbrichesi, E. Gabrielli, B. Mele, Hunting down massless dark photons in kaon physics.
Phys. Rev. Lett. 119(3), 031801 (2017). arXiv:1705.03470 [hep-ph]. https://doi.org/10.1103/
PhysRevLett.119.031801
62. Particle Data Group Collaboration, M. Tanabashi et al., Review of particle physics. Phys. Rev.
D 98(3), 030001 (2018). https://doi.org/10.1103/PhysRevD.98.030001
63. NA62 Collaboration, E. Cortina Gil et al., The Beam and detector of the NA62 experiment at
CERN. JINST 12(05), P05025 (2017). arXiv:1703.08501 [physics.ins-det]. https://doi.org/10.
1088/1748-0221/12/05/P05025
64. NA62 Collaboration, E. Cortina Gil et al., First search for K + → π + ν ¯
ν using the decay-inflight technique. Phys. Lett. B 791, 156–166 (2019). arXiv:1811.08508 [hep-ex]. https://doi.
org/10.1016/j.physletb.2019.01.067
65. KOTO Collaboration, J. Ahn et al., Search for the K L → π 0 νν and K L → π 0 X 0 decays at
the J-PARC KOTO experiment. Phys. Rev. Lett. 122(2), 021802 (2019). arXiv:1810.09655
[hep-ex]. https://doi.org/10.1103/PhysRevLett.122.021802
66. M. Fabbrichesi, E. Gabrielli, Dark-sector physics in the search for the rare decays K + → π + ν ¯
ν
and K L → π 0 ν ¯
ν. Eur. Phys. J. C 80(6), 532 (2020). arXiv:1911.03755 [hep-ph]. https://doi.
org/10.1140/epjc/s10052-020-8103-7
67. J.-Y. Su, J. Tandean, Searching for dark photons in hyperon decays. arXiv:1911.13301 [hep-ph]
68. J.-Y. Su, J. Tandean, Seeking massless dark photons in the decays of charmed hadrons.
arXiv:2005.05297 [hep-ph]
69. BaBar Collaboration, J.P. Lees et al., Improved limits on B 0 decays to invisible final states and
to ν ¯
νγ. Phys. Rev. D86, 051105 (2012). arXiv:1206.2543 [hep-ex]. https://doi.org/10.1103/
PhysRevD.86.051105
70. Belle Collaboration, C.L. Hsu et al., Search for B 0 decays to invisible final states. Phys. Rev.
D86, 032002 (2012). arXiv:1206.5948 [hep-ex]. https://doi.org/10.1103/PhysRevD.86.032002
71. S.N. Gninenko, N.V. Krasnikov, Invisible K L decays as a probe of new physics. Phys. Rev.
D92(3), 034009 (2015). arXiv:1503.01595 [hep-ph]. https://doi.org/10.1103/PhysRevD.92.
034009
2 Phenomenology of the Massless Dark Photon
52. E. Gabrielli, L. Marzola, M. Raidal, Radiative Yukawa couplings in the simplest left-right
symmetric model. Phys. Rev. D95(3), 035005 (2017). arXiv:1611.00009 [hep-ph]. https://doi.
org/10.1103/PhysRevD.95.035005
53. E. Gabrielli, B. Mele, M. Raidal, E. Venturini, FCNC decays of standard model fermions into a
dark photon. Phys. Rev. D94(11), 115013 (2016). arXiv:1607.05928 [hep-ph]. https://doi.org/
10.1103/PhysRevD.94.115013
54. J.T. Acuña, M. Fabbrichesi, P. Ullio, Phenomenological Consequences of an Interacting Multicomponent Dark Sector. arXiv:2005.04146 [hep-ph]
55. ATLAS Collaboration, M. Aaboud et al., Search for squarks and gluinos in final states with
jets and missing transverse momentum using 36 fb −1 of
√
s = 13 TeV pp collision data with
the ATLAS detector. Phys. Rev. D97(11), 112001 (2018). arXiv:1712.02332 [hep-ex]. https://
doi.org/10.1103/PhysRevD.97.112001
56. D. Barducci, M. Fabbrichesi, E. Gabrielli, Neutral Hadrons disappearing into the darkness.
Phys. Rev. D98 (3), 035049 (2018). arXiv:1806.05678 [hep-ph]. https://doi.org/10.1103/
PhysRevD.98.035049
57. CMS Collaboration, A.M. Sirunyan et al., Search for supersymmetric partners of electrons
and muons in proton-proton collisions at
√
s = 13 TeV. Phys. Lett. B790, 140–166 (2019).
arXiv:1806.05264 [hep-ex]. https://doi.org/10.1016/j.physletb.2019.01.005
58. MEG Collaboration, A. Baldini et al., Search for the lepton flavour violating decay μ + →
e + with the full dataset of the MEG experiment. Eur. Phys. J. C 76(8), 434 (2016).
arXiv:1605.05081 [hep-ex]. https://doi.org/10.1140/epjc/s10052-016-4271-x
59. BaBar Collaboration, J. Lees et al., Precision measurement of the B → X s γ photon energy
spectrum, branching fraction, and direct CP asymmetry A C P (B → X s+d γ). Phys. Rev. Lett.
109, 191801 (2012). https://doi.org/10.1103/PhysRevLett.109.191801. arXiv:1207.2690 [hepex]
60. M. Misiak et al., Estimate of B( ¯
B → X s γ) at O(α 2
s ). Phys. Rev. Lett. 98, 022002 (2007).
https://doi.org/10.1103/PhysRevLett.98.022002. arXiv:hep-ph/0609232
61. M. Fabbrichesi, E. Gabrielli, B. Mele, Hunting down massless dark photons in kaon physics.
Phys. Rev. Lett. 119(3), 031801 (2017). arXiv:1705.03470 [hep-ph]. https://doi.org/10.1103/
PhysRevLett.119.031801
62. Particle Data Group Collaboration, M. Tanabashi et al., Review of particle physics. Phys. Rev.
D 98(3), 030001 (2018). https://doi.org/10.1103/PhysRevD.98.030001
63. NA62 Collaboration, E. Cortina Gil et al., The Beam and detector of the NA62 experiment at
CERN. JINST 12(05), P05025 (2017). arXiv:1703.08501 [physics.ins-det]. https://doi.org/10.
1088/1748-0221/12/05/P05025
64. NA62 Collaboration, E. Cortina Gil et al., First search for K + → π + ν ¯
ν using the decay-inflight technique. Phys. Lett. B 791, 156–166 (2019). arXiv:1811.08508 [hep-ex]. https://doi.
org/10.1016/j.physletb.2019.01.067
65. KOTO Collaboration, J. Ahn et al., Search for the K L → π 0 νν and K L → π 0 X 0 decays at
the J-PARC KOTO experiment. Phys. Rev. Lett. 122(2), 021802 (2019). arXiv:1810.09655
[hep-ex]. https://doi.org/10.1103/PhysRevLett.122.021802
66. M. Fabbrichesi, E. Gabrielli, Dark-sector physics in the search for the rare decays K + → π + ν ¯
ν
and K L → π 0 ν ¯
ν. Eur. Phys. J. C 80(6), 532 (2020). arXiv:1911.03755 [hep-ph]. https://doi.
org/10.1140/epjc/s10052-020-8103-7
67. J.-Y. Su, J. Tandean, Searching for dark photons in hyperon decays. arXiv:1911.13301 [hep-ph]
68. J.-Y. Su, J. Tandean, Seeking massless dark photons in the decays of charmed hadrons.
arXiv:2005.05297 [hep-ph]
69. BaBar Collaboration, J.P. Lees et al., Improved limits on B 0 decays to invisible final states and
to ν ¯
νγ. Phys. Rev. D86, 051105 (2012). arXiv:1206.2543 [hep-ex]. https://doi.org/10.1103/
PhysRevD.86.051105
70. Belle Collaboration, C.L. Hsu et al., Search for B 0 decays to invisible final states. Phys. Rev.
D86, 032002 (2012). arXiv:1206.5948 [hep-ex]. https://doi.org/10.1103/PhysRevD.86.032002
71. S.N. Gninenko, N.V. Krasnikov, Invisible K L decays as a probe of new physics. Phys. Rev.
D92(3), 034009 (2015). arXiv:1503.01595 [hep-ph]. https://doi.org/10.1103/PhysRevD.92.
034009