Abstract
We assess the current coverage and the future discovery potential of LHC searches for heavy Higgs bosons decaying into long-lived particles (LLPs), focusing primarily on the production of pairs of LLPs with hadronic final states. These signatures are generic in dark sectors where a heavy scalar decays into pairs of lighter states which subsequently mix with the Standard Model Higgs. We show that a handful of existing analyses provide broad coverage of LLP decay lengths ranging from millimeters to tens of meters, and explore the complementarity between searches for displaced and prompt final states in several simplified models. For both heavy singlet and heavy doublet scalars, LLP searches typically provide the leading sensitivity in current data and exhibit the strongest discovery potential in future LHC runs. We further translate the impact of these searches into the parameter space of various Twin Higgs models, demonstrating that LLP searches are a promising avenue for discovering a Twin Higgs with displaced decays. Finally, we propose a variety of additional search channels that would improve coverage of the second Higgs at the lifetime frontier.
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References
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, 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].
S. Chang, P.J. Fox and N. Weiner, Naturalness and Higgs decays in the MSSM with a singlet, JHEP 08 (2006) 068 [hep-ph/0511250] [INSPIRE].
T. Han, Z. Si, K.M. Zurek and M.J. Strassler, Phenomenology of hidden valleys at hadron colliders, JHEP 07 (2008) 008 [arXiv:0712.2041] [INSPIRE].
B. Batell, S. Gori and L.-T. Wang, Exploring the Higgs Portal with 10 fb–1 at the LHC, JHEP 06 (2012) 172 [arXiv:1112. 5180] [INSPIRE].
B. Holdom and M. Ratzlaff, Distinctive heavy Higgs boson decays, Phys. Rev. D 91 (2015) 035031 [arXiv:1412.1513] [INSPIRE].
D. Curtin et al., Exotic decays of the 125 GeV Higgs boson, Phys. Rev. D 90 (2014) 075004 [arXiv:1312.4992] [INSPIRE].
B. Coleppa, F. Kling and S. Su, Exotic Decays Of A Heavy Neutral Higgs Through HZ/AZ Channel, JHEP 09 (2014) 161 [arXiv:1404.1922] [INSPIRE].
F. Kling, J.M. No and S. Su, Anatomy of Exotic Higgs Decays in 2HDM, JHEP 09 (2016) 093 [arXiv:1604.01406] [INSPIRE].
B. Coleppa, B. Fuks, P. Poulose and S. Sahoo, Seeking Heavy Higgs Bosons through Cascade Decays, Phys. Rev. D 97 (2018) 075007 [arXiv:1712.06593] [INSPIRE].
N. Craig, F. D’Eramo, P. Draper, S. Thomas and H. Zhang, The Hunt for the Rest of the Higgs Bosons, JHEP 06 (2015) 137 [arXiv:1504.04630] [INSPIRE].
R.K. Barman, B. Bhattacherjee, A. Chakraborty and A. Choudhury, Study of MSSM heavy Higgs bosons decaying into charginos and neutralinos, Phys. Rev. D 94 (2016) 075013 [arXiv:1607.00676] [INSPIRE].
S. Kulkarni and L. Lechner, Characterizing simplified models for heavy Higgs decays to supersymmetric particles, arXiv:1711.00056 [INSPIRE].
E. Bagnaschi et al., MSSM Higgs Boson Searches at the LHC: Benchmark Scenarios for Run 2 and Beyond, Eur. Phys. J. C 79 (2019) 617 [arXiv:1808.07542] [INSPIRE].
S. Gori, Z. Liu and B. Shakya, Heavy Higgs as a Portal to the Supersymmetric Electroweak Sector, JHEP 04 (2019) 049 [arXiv:1811.11918] [INSPIRE].
M.J. Strassler and K.M. Zurek, Echoes of a hidden valley at hadron colliders, Phys. Lett. B 651 (2007) 374 [hep-ph/0604261] [INSPIRE].
M.J. Strassler and K.M. Zurek, Discovering the Higgs through highly-displaced vertices, Phys. Lett. B 661 (2008) 263 [hep-ph/0605193] [INSPIRE].
D. Curtin et al., Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case, Rept. Prog. Phys. 82 (2019) 116201 [arXiv:1806.07396] [INSPIRE].
L. Lee, C. Ohm, A. Soffer and T.-T. Yu, Collider Searches for Long-Lived Particles Beyond the Standard Model, Prog. Part. Nucl. Phys. 106 (2019) 210 [arXiv:1810.12602] [INSPIRE].
J.D. Clarke, Constraining portals with displaced Higgs decay searches at the LHC, JHEP 10 (2015) 061 [arXiv:1505.00063] [INSPIRE].
C. Csáki, E. Kuflik, S. Lombardo and O. Slone, Searching for displaced Higgs boson decays, Phys. Rev. D 92 (2015) 073008 [arXiv:1508.01522] [INSPIRE].
D. Curtin and C.B. Verhaaren, Discovering Uncolored Naturalness in Exotic Higgs Decays, JHEP 12 (2015) 072 [arXiv:1506.06141] [INSPIRE].
A. Pierce, B. Shakya, Y. Tsai and Y. Zhao, Searching for confining hidden valleys at LHCb, ATLAS and CMS, Phys. Rev. D 97 (2018) 095033 [arXiv:1708.05389] [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].
A. Delgado, G. Nardini and M. Quirós, A Light Supersymmetric Higgs Sector Hidden by a Standard Model-like Higgs, JHEP 07 (2013) 054 [arXiv:1303.0800] [INSPIRE].
N. Craig, J. Galloway and S. Thomas, Searching for Signs of the Second Higgs Doublet, arXiv:1305.2424 [INSPIRE].
M. Carena, I. Low, N.R. Shah and C.E.M. Wagner, Impersonating the Standard Model Higgs Boson: Alignment without Decoupling, JHEP 04 (2014) 015 [arXiv:1310.2248] [INSPIRE].
H.E. Haber, The Higgs data and the Decoupling Limit, in proceedings of the 1st Toyama International Workshop on Higgs as a Probe of New Physics 2013 (HPNP2013), Toyama, Japan, 13–16 February 2013, arXiv:1401.0152 [INSPIRE].
N. Craig, S. Knapen and P. Longhi, Neutral Naturalness from Orbifold Higgs Models, Phys. Rev. Lett. 114 (2015) 061803 [arXiv:1410.6808] [INSPIRE].
Z. Chacko, H.-S. Goh and R. Harnik, The Twin Higgs: Natural electroweak breaking from mirror symmetry, Phys. Rev. Lett. 96 (2006) 231802 [hep-ph/0506256] [INSPIRE].
B. Mellado Garcia, P. Musella, M. Grazzini and R. Harlander, CERN Report 4: Part I Standard Model Predictions, LHCHXSWG-DRAFT-INT-2016-008 (2016).
ATLAS collaboration, Search for long-lived particles produced in pp collisions at \( \sqrt{s} \) = 13 TeV that decay into displaced hadronic jets in the ATLAS muon spectrometer, Phys. Rev. D 99 (2019) 052005 [arXiv:1811.07370] [INSPIRE].
CMS collaboration, Search for long-lived particles decaying into displaced jets in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, Phys. Rev. D 99 (2019) 032011 [arXiv:1811.07991] [INSPIRE].
CMS collaboration, Search for long-lived particles with displaced vertices in multijet events in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, Phys. Rev. D 98 (2018) 092011 [arXiv:1808.03078] [INSPIRE].
CMS collaboration, Search for Long-Lived Neutral Particles Decaying to Quark-Antiquark Pairs in Proton-Proton Collisions at \( \sqrt{s} \) = 8 TeV, Phys. Rev. D 91 (2015) 012007 [arXiv:1411.6530] [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 JHEP 03 (2019) 128] [arXiv:1804.01939] [INSPIRE].
ATLAS collaboration, Search for pair production of Higgs bosons in the \( b\overline{b}b\overline{b} \) final state using proton-proton collisions at \( \sqrt{s} \) = 13 TeV with the ATLAS detector, JHEP 01 (2019) 030 [arXiv:1804.06174] [INSPIRE].
CMS collaboration, Search for a massive resonance decaying to a pair of Higgs bosons in the four b quark final state in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, Phys. Lett. B 781 (2018) 244 [arXiv:1710.04960] [INSPIRE].
ATLAS collaboration, Search for heavy ZZ resonances in the ℓ+ ℓ− ℓ+ ℓ− and ℓ+ ℓ− \( v\overline{v} \) final states using proton-proton collisions at \( \sqrt{s} \) = 13 TeV with the ATLAS detector, ATLAS-CONF-2017-058 (2017) [INSPIRE].
CMS collaboration, Search for invisible decays of the Higgs boson produced through vector boson fusion at \( \sqrt{s} \) = 13 TeV , CMS-PAS-HIG-17-023 (2018) [INSPIRE].
ATLAS collaboration, Search for long-lived, weakly interacting particles that decay to displaced hadronic jets in proton-proton collisions at \( \sqrt{s} \) = 8 TeV with the ATLAS detector, Phys. Rev. D 92 (2015) 012010 [arXiv:1504.03634] [INSPIRE].
ATLAS collaboration, Triggers for displaced decays of long-lived neutral particles in the ATLAS detector, 2013 JINST 8 P07015 [arXiv:1305.2284] [INSPIRE].
ATLAS collaboration, Standalone vertex finding in the ATLAS muon spectrometer, 2014 JINST 9 P02001 [arXiv:1311.7070] [INSPIRE].
G. Salam and A. Weiler, Collider Reach (β), (2014) http://collider-reach.web.cern.ch/.
A. Thamm, R. Torre and A. Wulzer, Future tests of Higgs compositeness: direct vs. indirect, JHEP 07 (2015) 100 [arXiv:1502.01701] [INSPIRE].
D. Buttazzo, F. Sala and A. Tesi, Singlet-like Higgs bosons at present and future colliders, JHEP 11 (2015) 158 [arXiv:1505.05488] [INSPIRE].
Y. Gershtein, CMS Hardware Track Trigger: New Opportunities for Long-Lived Particle Searches at the HL-LHC, Phys. Rev. D 96 (2017) 035027 [arXiv:1705.04321] [INSPIRE].
J. Liu, Z. Liu and L.-T. Wang, Enhancing Long-Lived Particles Searches at the LHC with Precision Timing Information, Phys. Rev. Lett. 122 (2019) 131801 [arXiv:1805.05957] [INSPIRE].
R. Barbieri, L.J. Hall, Y. Nomura and V.S. Rychkov, Supersymmetry without a Light Higgs Boson, Phys. Rev. D 75 (2007) 035007 [hep-ph/0607332] [INSPIRE].
D. Curtin, P. Meade and C.-T. Yu, Testing Electroweak Baryogenesis with Future Colliders, JHEP 11 (2014) 127 [arXiv:1409.0005] [INSPIRE].
R. Barbieri, T. Gregoire and L.J. Hall, Mirror world at the large hadron collider, hep-ph/0509242 [INSPIRE].
Z. Chacko, C. Kilic, S. Najjari and C.B. Verhaaren, Testing the Scalar Sector of the Twin Higgs Model at Colliders, Phys. Rev. D 97 (2018) 055031 [arXiv:1711.05300] [INSPIRE].
A. Ahmed, Heavy Higgs of the Twin Higgs Models, JHEP 02 (2018) 048 [arXiv:1711.03107] [INSPIRE].
S. Dawson et al., Working Group Report: Higgs Boson, in proceedings of the Community Summer Study 2013: Snowmass on the Mississippi (CSS2013), Minneapolis, MN, U.S.A., 29 July–6 August 2013, arXiv:1310.8361 [INSPIRE].
D. Buttazzo, D. Redigolo, F. Sala and A. Tesi, Fusing Vectors into Scalars at High Energy Lepton Colliders, JHEP 11 (2018) 144 [arXiv:1807.04743] [INSPIRE].
M. Cepeda et al., Report from Working Group 2: Higgs Physics at the HL-LHC and HE-LHC, arXiv:1902.00134 [INSPIRE].
N. Craig, A. Katz, M. Strassler and R. Sundrum, Naturalness in the Dark at the LHC, JHEP 07 (2015) 105 [arXiv:1501.05310] [INSPIRE].
J.F. Donoghue and L.F. Li, Properties of Charged Higgs Bosons, Phys. Rev. D 19 (1979) 945 [INSPIRE].
E. Alvarez, D.A. Faroughy, J.F. Kamenik, R. Morales and A. Szynkman, Four Tops for LHC, Nucl. Phys. B 915 (2017) 19 [arXiv:1611.05032] [INSPIRE].
M. Carena and Z. Liu, Challenges and opportunities for heavy scalar searches in the \( t\overline{t} \) channel at the LHC, JHEP 11 (2016) 159 [arXiv:1608.07282] [INSPIRE].
M. Czakon, D. Heymes and A. Mitov, Bump hunting in LHC \( t\overline{t} \) events, Phys. Rev. D 94 (2016) 114033 [arXiv:1608.00765] [INSPIRE].
B. Hespel, F. Maltoni and E. Vryonidou, Signal background interference effects in heavy scalar production and decay to a top-anti-top pair, JHEP 10 (2016) 016 [arXiv:1606.04149] [INSPIRE].
N. Craig, J. Hajer, Y.-Y. Li, T. Liu and H. Zhang, Heavy Higgs bosons at low tan β: from the LHC to 100 TeV, JHEP 01 (2017) 018 [arXiv:1605.08744] [INSPIRE].
S. Gori, I.-W. Kim, N.R. Shah and K.M. Zurek, Closing the Wedge: Search Strategies for Extended Higgs Sectors with Heavy Flavor Final States, Phys. Rev. D 93 (2016) 075038 [arXiv:1602.02782] [INSPIRE].
S. Jung, J. Song and Y.W. Yoon, Dip or nothingness of a Higgs resonance from the interference with a complex phase, Phys. Rev. D 92 (2015) 055009 [arXiv:1505.00291] [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. Cohen, N. Craig, G.F. Giudice and M. Mccullough, The Hyperbolic Higgs, JHEP 05 (2018) 091 [arXiv:1803.03647] [INSPIRE].
G. Burdman, Z. Chacko, R. Harnik, L. de Lima and C.B. Verhaaren, Colorless Top Partners, a 125 GeV Higgs and the Limits on Naturalness, Phys. Rev. D 91 (2015) 055007 [arXiv:1411.3310] [INSPIRE].
N. Craig and K. Howe, Doubling down on naturalness with a supersymmetric twin Higgs, JHEP 03 (2014) 140 [arXiv:1312.1341] [INSPIRE].
A. Katz, A. Mariotti, S. Pokorski, D. Redigolo and R. Ziegler, SUSY Meets Her Twin, JHEP 01 (2017) 142 [arXiv:1611.08615] [INSPIRE].
A. Falkowski, S. Pokorski and M. Schmaltz, Twin SUSY, Phys. Rev. D 74 (2006) 035003 [hep-ph/0604066] [INSPIRE].
S. Chang, L.J. Hall and N. Weiner, A Supersymmetric twin Higgs, Phys. Rev. D 75 (2007) 035009 [hep-ph/0604076] [INSPIRE].
C. Kilic, S. Najjari and C.B. Verhaaren, Discovering the Twin Higgs Boson with Displaced Decays, Phys. Rev. D 99 (2019) 075029 [arXiv:1812.08173] [INSPIRE].
C. Csáki, E. Kuflik, S. Lombardo, O. Slone and T. Volansky, Phenomenology of a Long-Lived LSP with R-Parity Violation, JHEP 08 (2015) 016 [arXiv:1505.00784] [INSPIRE].
ATLAS collaboration, Search for pair-produced long-lived neutral particles decaying in the ATLAS hadronic calorimeter in pp collisions at \( \sqrt{s} \) = 8 TeV, Phys. Lett. B 743 (2015) 15 [arXiv:1501.04020] [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].
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].
T. Sjöstrand, S. Mrenna and P.Z. Skands, A Brief Introduction to PYTHIA 8.1, Comput. Phys. Commun. 178 (2008) 852 [arXiv:0710.3820] [INSPIRE].
DELPHES 3 collaboration, DELPHES 3, A modular framework for fast simulation of a generic collider experiment, JHEP 02 (2014) 057 [arXiv:1307.6346] [INSPIRE].
Z. Liu and B. Tweedie, The Fate of Long-Lived Superparticles with Hadronic Decays after LHC Run 1, JHEP 06 (2015) 042 [arXiv:1503.05923] [INSPIRE].
R. Brun and F. Rademakers, ROOT: An object oriented data analysis framework, Nucl. Instrum. Meth. A 389 (1997) 81 [INSPIRE].
CMS collaboration, Description and performance of track and primary-vertex reconstruction with the CMS tracker, 2014 JINST 9 P10009 [arXiv:1405.6569] [INSPIRE].
V. Prilepina and Y. Tsai, Reconciling Large And Small-Scale Structure In Twin Higgs Models, JHEP 09 (2017) 033 [arXiv:1611.05879] [INSPIRE].
M. Gockeler et al., A Determination of the Lambda parameter from full lattice QCD, Phys. Rev. D 73 (2006) 014513 [hep-ph/0502212] [INSPIRE].
C.J. Morningstar and M.J. Peardon, The Glueball spectrum from an anisotropic lattice study, Phys. Rev. D 60 (1999) 034509 [hep-lat/9901004] [INSPIRE].
C. Patrignani, T.K. Pedlar and J.L. Rosner, Recent Results in Bottomonium, Ann. Rev. Nucl. Part. Sci. 63 (2013) 21 [arXiv:1212.6552] [INSPIRE].
J.E. Juknevich, Pure-glue hidden valleys through the Higgs portal, JHEP 08 (2010) 121 [arXiv:0911.5616] [INSPIRE].
M. Spira, Higgs Boson Production and Decay at Hadron Colliders, Prog. Part. Nucl. Phys. 95 (2017) 98 [arXiv:1612.07651] [INSPIRE].
M. Spira, A. Djouadi, D. Graudenz and P.M. Zerwas, Higgs boson production at the LHC, Nucl. Phys. B 453 (1995) 17 [hep-ph/9504378] [INSPIRE].
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Alipour-Fard, S., Craig, N., Gori, S. et al. The second Higgs at the lifetime frontier. J. High Energ. Phys. 2020, 29 (2020). https://doi.org/10.1007/JHEP07(2020)029
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DOI: https://doi.org/10.1007/JHEP07(2020)029