Abstract
We propose a coherent explanation for the 750 GeV diphoton anomaly and the hints of deviations from Lepton Flavor Universality in B decays in terms a new strongly interacting sector with vectorlike confinement. The diphoton excess arises from the decay ofone of the pseudo-Nambu-Goldstone bosons of the new sector, while the flavor anomalies are a manifestation of the exchange of the corresponding vector resonances (with masses in the 1.5-2.5 TeV range). We provide explicit examples (with detailed particle content and group structure) of the new sector, discussing both the low-energy flavor-physics phenomenology and the signatures at high p T . We show that specific models can provide an excellent fit to all available data. A key feature of all realizations is a sizable broad excess in the tails of τ + τ − invariant mass distribution in p p → τ + τ −, that should be accessible at the LHC in the near future.
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ATLAS collaboration, Search for resonances in diphoton events with the ATLAS detector at \( \sqrt{s}=13 \) TeV, ATLAS-CONF-2016-018 (2016).
CMS collaboration, Search for new physics in high mass diphoton events in 3.3 fb−1 of proton-proton collisions at \( \sqrt{s}=13 \) TeV and combined interpretation of searches at 8 TeV and 13 TeV, CMS-PAS-EXO-16-018 (2016).
CMS collaboration, Search for new physics in high mass diphoton events in proton-proton collisions at \( \sqrt{s}=13 \) TeV, CMS-PAS-EXO-15-004 (2015).
ATLAS collaboration, Search for resonances decaying to photon pairs in 3.2 fb −1 of pp collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector, ATLAS-CONF-2015-081 (2015).
CMS collaboration, Search for new resonances in the diphoton final state in the range between 150 and 850 GeV in pp collisions at \( \sqrt{s}=8 \) TeV, CMS-PAS-HIG-14-006 (2015).
ATLAS collaboration, Search for high-mass diphoton resonances in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, Phys. Rev. D 92 (2015) 032004 [arXiv:1504.05511] [INSPIRE].
BaBar collaboration, J.P. Lees et al., Measurement of an Excess of \( \overline{B}\to {D}^{\left(\ast \right)}\tau -\overline{\nu}\tau \) Decays and Implications for Charged Higgs Bosons, Phys. Rev. D 88 (2013) 072012 [arXiv:1303.0571] [INSPIRE].
Belle collaboration, M. Huschle et al., Measurement of the branching ratio of \( \overline{B}\to {D}^{\left(\ast \right)}\tau -\overline{\nu}\tau \) relative to \( \overline{B}\to {D}^{\left(\ast \right)}\ell -\overline{\nu}\ell \) decays with hadronic tagging at Belle, Phys. Rev. D 92 (2015) 072014 [arXiv:1507.03233] [INSPIRE].
LHCb collaboration, Measurement of the ratio of branching fractions \( \mathrm{\mathcal{B}}\left({\overline{B}}^0\to {D}^{\ast +}{\tau}^{-}{\overline{\nu}}_{\tau}\right)/\mathrm{\mathcal{B}}\left({\overline{B}}^0\to {D}^{\ast +}{\mu}^{-}{\overline{\nu}}_{\mu}\right) \), Phys. Rev. Lett. 115 (2015) 111803 [arXiv:1506.08614] [INSPIRE].
LHCb collaboration, Test of lepton universality using B + → K + ℓ + ℓ − decays, Phys. Rev. Lett. 113 (2014) 151601 [arXiv:1406.6482] [INSPIRE].
LHCb collaboration, Angular analysis of the B 0 → K ∗0 μ + μ − decay, LHCb-CONF-2015-002 (2015).
C. Kilic, T. Okui and R. Sundrum, Vectorlike Confinement at the LHC, JHEP 02 (2010) 018 [arXiv:0906.0577] [INSPIRE].
C. Kilic and T. Okui, The LHC Phenomenology of Vectorlike Confinement, JHEP 04 (2010) 128 [arXiv:1001.4526] [INSPIRE].
R. Franceschini et al., What is the γγ resonance at 750 GeV?, JHEP 03 (2016) 144 [arXiv:1512.04933] [INSPIRE].
K. Harigaya and Y. Nomura, Composite Models for the 750 GeV Diphoton Excess, Phys. Lett. B 754 (2016) 151 [arXiv:1512.04850] [INSPIRE].
Y. Nakai, R. Sato and K. Tobioka, Footprints of New Strong Dynamics via Anomaly and the 750 GeV Diphoton, Phys. Rev. Lett. 116 (2016) 151802 [arXiv:1512.04924] [INSPIRE].
L. Bian, N. Chen, D. Liu and J. Shu, Hidden confining world on the 750 GeV diphoton excess, Phys. Rev. D 93 (2016) 095011 [arXiv:1512.05759] [INSPIRE].
N. Craig, P. Draper, C. Kilic and S. Thomas, Shedding Light on Diphoton Resonances, Phys. Rev. D 93 (2016) 115023 [arXiv:1512.07733] [INSPIRE].
Y. Bai, J. Berger and R. Lu, 750 GeV dark pion: Cousin of a dark G-parity odd WIMP, Phys. Rev. D 93 (2016) 076009 [arXiv:1512.05779] [INSPIRE].
K. Harigaya and Y. Nomura, A Composite Model for the 750 GeV Diphoton Excess, JHEP 03 (2016) 091 [arXiv:1602.01092] [INSPIRE].
M. Redi, A. Strumia, A. Tesi and E. Vigiani, Di-photon resonance and Dark Matter as heavy pions, JHEP 05 (2016) 078 [arXiv:1602.07297] [INSPIRE].
K. Harigaya and Y. Nomura, Hidden Pion Varieties in Composite Models for Diphoton Resonances, arXiv:1603.05774 [INSPIRE].
J.F. Kamenik and M. Redi, Back to 1974: The \( \mathcal{Q} \) -onium, Phys. Lett. B 760 (2016) 158 [arXiv:1603.07719] [INSPIRE].
D. Buttazzo, A. Greljo and D. Marzocca, Knocking on new physics’ door with a scalar resonance, Eur. Phys. J. C 76 (2016) 116 [arXiv:1512.04929] [INSPIRE].
M. Low, A. Tesi and L.-T. Wang, A pseudoscalar decaying to photon pairs in the early LHC Run 2 data, JHEP 03 (2016) 108 [arXiv:1512.05328] [INSPIRE].
B. Bellazzini, R. Franceschini, F. Sala and J. Serra, Goldstones in Diphotons, JHEP 04 (2016) 072 [arXiv:1512.05330] [INSPIRE].
J.M. No, V. Sanz and J. Setford, See-saw composite Higgs model at the LHC: Linking naturalness to the 750 GeV diphoton resonance, Phys. Rev. D 93 (2016) 095010 [arXiv:1512.05700] [INSPIRE].
A. Belyaev, G. Cacciapaglia, H. Cai, T. Flacke, A. Parolini and H. Serôdio, Singlets in composite Higgs models in light of the LHC 750 GeV diphoton excess, Phys. Rev. D 94 (2016) 015004 [arXiv:1512.07242] [INSPIRE].
E. Molinaro, F. Sannino and N. Vignaroli, Minimal Composite Dynamics versus Axion Origin of the Diphoton excess, arXiv:1512.05334 [INSPIRE].
S. Matsuzaki and K. Yamawaki, 750 GeV Diphoton Signal from One-Family Walking Technipion, Mod. Phys. Lett. A 31 (2016) 1630016 [arXiv:1512.05564] [INSPIRE].
E. Molinaro, F. Sannino and N. Vignaroli, Collider Tests of (Composite) Diphoton Resonances, arXiv:1602.07574 [INSPIRE].
A. Greljo, G. Isidori and D. Marzocca, On the breaking of Lepton Flavor Universality in B decays, JHEP 07 (2015) 142 [arXiv:1506.01705] [INSPIRE].
R. Barbieri, G. Isidori, A. Pattori and F. Senia, Anomalies in B-decays and U(2) flavour symmetry, Eur. Phys. J. C 76 (2016) 67 [arXiv:1512.01560] [INSPIRE].
R. Barbieri, G. Isidori, J. Jones-Perez, P. Lodone and D.M. Straub, U(2) and Minimal Flavour Violation in Supersymmetry, Eur. Phys. J. C 71 (2011) 1725 [arXiv:1105.2296] [INSPIRE].
F. Goertz, J.F. Kamenik, A. Katz and M. Nardecchia, Indirect Constraints on the Scalar Di-Photon Resonance at the LHC, JHEP 05 (2016) 187 [arXiv:1512.08500] [INSPIRE].
G. Bélanger and C. Delaunay, A Dark Sector for g μ − 2, R K and a Diphoton Resonance, arXiv:1603.03333 [INSPIRE].
M. Bauer and M. Neubert, Flavor anomalies, the 750 GeV diphoton excess and a dark matter candidate, Phys. Rev. D 93 (2016) 115030 [arXiv:1512.06828] [INSPIRE].
C.W. Murphy, Vector Leptoquarks and the 750 GeV Diphoton Resonance at the LHC, Phys. Lett. B 757 (2016) 192 [arXiv:1512.06976] [INSPIRE].
F.F. Deppisch, S. Kulkarni, H. Päs and E. Schumacher, Leptoquark patterns unifying neutrino masses, flavor anomalies and the diphoton excess, Phys. Rev. D 94 (2016) 013003 [arXiv:1603.07672] [INSPIRE].
S.L. Glashow, D. Guadagnoli and K. Lane, Lepton Flavor Violation in B Decays?, Phys. Rev. Lett. 114 (2015) 091801 [arXiv:1411.0565] [INSPIRE].
D.B. Kaplan, Flavor at SSC energies: A New mechanism for dynamically generated fermion masses, Nucl. Phys. B 365 (1991) 259 [INSPIRE].
R. Barbieri, D. Buttazzo, F. Sala and D.M. Straub, Flavour physics from an approximate U(2)3 symmetry, JHEP 07 (2012) 181 [arXiv:1203.4218] [INSPIRE].
C. Pica and F. Sannino, Anomalous Dimensions of Conformal Baryons, arXiv:1604.02572 [INSPIRE].
B. Gripaios, M. Nardecchia and S.A. Renner, Composite leptoquarks and anomalies in B-meson decays, JHEP 05 (2015) 006 [arXiv:1412.1791] [INSPIRE].
L. Calibbi, A. Crivellin and T. Ota, Effective Field Theory Approach to b → sℓℓ (′) , \( B\to {K}^{\left(\ast \right)}\nu \overline{\nu} \) and B→D (∗) τν with Third Generation Couplings, Phys. Rev. Lett. 115(2015) 181801 [arXiv:1506.02661] [INSPIRE].
M. Bauer and M. Neubert, Minimal Leptoquark Explanation for the \( {R}_{{{}_D}_{\left(\ast \right)}} \) , RK and (g − 2) g Anomalies, Phys. Rev. Lett. 116 (2016) 141802 [arXiv:1511.01900] [INSPIRE].
S. Fajfer and N. Košnik, Vector leptoquark resolution of R K and R D(∗) puzzles, Phys. Lett. B 755 (2016) 270 [arXiv:1511.06024] [INSPIRE].
B. Bhattacharya, A. Datta, D. London and S. Shivashankara, Simultaneous Explanation of the R K and R(D (∗)) Puzzles, Phys. Lett. B 742 (2015) 370 [arXiv:1412.7164] [INSPIRE].
R. Alonso, B. Grinstein and J. Martin Camalich, Lepton universality violation and lepton flavor conservation in B-meson decays, JHEP 10 (2015) 184 [arXiv:1505.05164] [INSPIRE].
M. Freytsis, Z. Ligeti and J.T. Ruderman, Flavor models for \( B\to {D}^{\left(\ast \right)}\tau \overline{\nu} \), Phys. Rev. D 92 (2015) 054018 [arXiv:1506.08896] [INSPIRE].
I. Doršner, S. Fajfer, A. Greljo, J.F. Kamenik and N. Košnik, Physics of leptoquarks in precision experiments and at particle colliders, Phys. Rept. 641 (2016) 1 [arXiv:1603.04993] [INSPIRE].
P. Goldenzweig, \( \overline{B}\to {D^{\Big(}}^{\ast \Big)}\tau\ {\overline{\nu}}_{\tau } \) decays with hadronic and semileptonic tagging at Belle, talk presented at Moriond 2016, La Thuile Italy (2016).
Fermilab Lattice, MILC collaboration, A. Bazavov et al., B 0(s) -mixing matrix elements from lattice QCD for the Standard Model and beyond, Phys. Rev. D 93 (2016) 113016 [arXiv:1602.03560] [INSPIRE].
M. Blanke and A.J. Buras, Universal Unitarity Triangle 2016 and the tension between ΔM s,d and ε K in CMFV models, Eur. Phys. J. C 76 (2016) 197 [arXiv:1602.04020] [INSPIRE].
W. Altmannshofer and D.M. Straub, New physics in b → s transitions after LHC run 1, Eur. Phys. J. C 75 (2015) 382 [arXiv:1411.3161] [INSPIRE].
S. Descotes-Genon, L. Hofer, J. Matias and J. Virto, Global analysis of b → sℓℓ anomalies, JHEP 06 (2016) 092 [arXiv:1510.04239] [INSPIRE].
Particle Data Group collaboration, K.A. Olive et al., Review of Particle Physics, Chin. Phys. C 38 (2014) 090001 [INSPIRE].
L.A. Harland-Lang, A.D. Martin, P. Motylinski and R.S. Thorne, Parton distributions in the LHC era: MMHT 2014 PDFs, Eur. Phys. J. C 75 (2015) 204 [arXiv:1412.3989] [INSPIRE].
J. Alwall et al., The automated computation of tree-level and next-to-leading order differential cross sections and their matching to parton shower simulations, JHEP 07 (2014) 079 [arXiv:1405.0301] [INSPIRE].
A. Alloul, N.D. Christensen, C. Degrande, C. Duhr and B. Fuks, FeynRules 2.0 — A complete toolbox for tree-level phenomenology, Comput. Phys. Commun. 185 (2014) 2250 [arXiv:1310.1921] [INSPIRE].
ATLAS collaboration, A search for high-mass resonances decaying to τ + τ − in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 07 (2015) 157 [arXiv:1502.07177] [INSPIRE].
Y. Bai, V. Barger and J. Berger, Constraints on color-octet companions of a 750 GeV heavy pion from dijet and photon plus jet resonance searches, Phys. Rev. D 94 (2016) 011701 [arXiv:1604.07835] [INSPIRE].
ATLAS collaboration, Search for new phenomena in the dijet mass distribution using p − p collision data at \( \sqrt{s}=8 \) TeV with the ATLAS detector, Phys. Rev. D 91 (2015) 052007 [arXiv:1407.1376] [INSPIRE].
CMS collaboration, Search for resonances and quantum black holes using dijet mass spectra in proton-proton collisions at \( \sqrt{s}=8 \) TeV, Phys. Rev. D 91 (2015) 052009 [arXiv:1501.04198] [INSPIRE].
ATLAS collaboration, Search for new phenomena in dijet mass and angular distributions from pp collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector, Phys. Lett. B 754 (2016) 302 [arXiv:1512.01530] [INSPIRE].
ATLAS collaboration, A search for tt resonances using lepton-plus-jets events in proton-proton collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 08 (2015) 148 [arXiv:1505.07018] [INSPIRE].
CMS collaboration, Search for tt resonances in semileptonic final state, CMS-PAS-B2G-12-006 (2012).
CMS collaboration, Search for Third-Generation Scalar Leptoquarks in the tτ Channel in Proton-Proton Collisions at \( \sqrt{s=8} \) TeV, JHEP 07 (2015) 042 [arXiv:1503.09049] [INSPIRE].
CMS collaboration, Search for pair production of third-generation scalar leptoquarks and top squarks in proton-proton collisions at \( \sqrt{s}=8 \) TeV, Phys. Lett. B 739 (2014) 229 [arXiv:1408.0806] [INSPIRE].
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Buttazzo, D., Greljo, A., Isidori, G. et al. Toward a coherent solution of diphoton and flavor anomalies. J. High Energ. Phys. 2016, 35 (2016). https://doi.org/10.1007/JHEP08(2016)035
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DOI: https://doi.org/10.1007/JHEP08(2016)035