Abstract
This paper reports a study of the experimental signatures of hierarchical sectors beyond the Standard Model characterized by a flavour-violating heavy vector and a set of light pseudo-Goldstone bosons a1,2, spanning a large range of lifetimes. The non-minimal scalar spectrum triggers novel B decays into multiple leptons that would have escaped the reach of current searches. Novel displaced vertex analyses at LHCb are therefore discussed to probe the hierarchical new physics, extending the scope of the tracking system of the detector. Additionally, the reach of the proposed CODEX-b experiment is studied. By exploiting the use of tracks only reconstructed in subsystems of the detector at the high-level LHCb trigger, \( \mathcal{B}\left({B}_{s}^{0}\to {a}_{1}{a}_{2}\right)<{10}^{-8} \) and ℬ(B+ → K+a1a2) < 10−9 could be reached in the muon channel across seven orders of magnitude in the lifetime of the Goldstone bosons. Correspondingly, heavy-light particle couplings of order ≲ 1 could be tested, potentially ruling out composite Higgs scenarios where the heavy and light sectors couple strongly.
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I. Brivio and M. Trott, The Standard Model as an Effective Field Theory, Phys. Rept. 793 (2019) 1 [arXiv:1706.08945] [INSPIRE].
A.J. Buras and J. Girrbach, Left-handed Z' and Z FCNC quark couplings facing new b ⟶ sμ+ μ– data, JHEP 12 (2013) 009 [arXiv:1309.2466] [INSPIRE].
A. Crivellin, G. D’Ambrosio and J. Beeck, Explaining the LHC flavour anomalies, in 50th Rencontres de M oriond on EW Interactions and Unified Theories, La Thuile Italy, March 14-21 2015, pp. 101-106 [arXi v:1505.02026] [INSPIRE].
M. Algueró, J. Matias, A. Crivellin and C.A. Manzari, Unified explanation of the anomalies in semileptonic B decays and the W mass, Phys. Rev. D 106 (2022) 033005 [arXiv:2201.08170] [INSPIRE].
F. Sala and D.M. Straub, A New Light Particle in B Decays?, Phys. Lett. B 774 (2017) 205 [arXiv:1704.06188] [INSPIRE].
W. Altmannshofer et al., Light resonances and the low-q2 bin of \( {R}_{K^{\ast }} \), JHEP 03 (2018) 188 [arXiv:1711.07494] [INSPIRE].
M. Bauer, M. Neubert and A. Thamm, LHC as an Axion Factory: Probing an Axion Explanation for (g − 2)μ with Exotic Higgs Decays, Phys. Rev. Lett. 119 (2017) 031802 [arXiv:1704.08207] [INSPIRE].
J. Liu, C.E.M. Wagner and X.-P. Wang, A light complex scalar for the electron and muon anomalous magnetic moments, JHEP 03 (2019) 008 [arXiv:1810.11028] [INSPIRE].
M.A. Buen-Abad, J. Fan, M. Reece and C. Sun, Challenges for an axion explanation of the muon g − 2 measurement, JHEP 09 (2021) 101 [arXiv:2104.03267] [INSPIRE].
LHCb collaboration, Searches for rare \( {B}_s^0 \) and B0 decays into four muons, JHEP 03 (2022) 109 [arXiv:2111.11339] [INSPIRE].
M. Chala, U. Egede and M. Spannowsky, Searching new physics in rare B-meson decays into multiple muons, Eur. Phys. J. C 79 (2019) 431 [arXiv:1902.10156] [INSPIRE].
B. Batell, M. Pospelov and A. Ritz, Multi-lepton Signatures of a Hidden Sector in Rare B Decays, Phys. Rev. D 83 (2011) 054005 [arXiv:0911.4938] [INSPIRE].
M. Borsato et al., Unleashing the full power of LHCb to probe stealth new physics, Rept. Prog. Phys. 85 (2022) 024201 [arXiv:2105.12668] [INSPIRE].
D. Buarque Franzosi, G. Cacciapaglia, X. Cid Vidal, G. Ferretti, T. Flacke and C. Vázquez Sierra, Exploring new possibilities to discover a light pseudo-scalar at LHCb, Eur. Phys. J. C 82 (2022) 3 [arXiv:2106.12615] [INSPIRE].
X. Cid Vidal, A. Mariotti, D. Redigolo, F. Sala and K. Tobioka, New Axion Searches at Flavor Factories, JHEP 01 (2019) 113 [Erratum ibid. 06 (2020) 141] [arXiv:1810.09452] [INSPIRE].
A. Blance, M. Chala, M. Ramos and M. Spannowsky, Novel B-decay signatures of light scalars at high energy facilities, Phys. Rev. D 100 (2019) 115015 [arXiv:1907.13151] [INSPIRE].
B. Gripaios, A. Pomarol, F. Riva and J. Serra, Beyond the Minimal Composite Higgs Model, JHEP 04 (2009) 070 [arXiv:0902.1483] [INSPIRE].
V. Sanz and J. Setford, Composite Higgses with seesaw EWSB, JHEP 12 (2015) 154 [arXiv:1508.06133] [INSPIRE].
M. Chala, G. Nardini and I. Sobolev, Unified explanation for dark matter and electroweak baryogenesis with direct detection and gravitational wave signatures, Phys. Rev. D 94 (2016) 055006 [arXiv:1605.08663] [INSPIRE].
D.B. Kaplan, Flavor at SSC energies: A New mechanism for dynamically generated fermion masses, Nucl. Phys. B 365 (1991) 259 [INSPIRE].
G. Panico and A. Wulzer, The Composite Nambu-Goldstone Higgs, Lecture Notes in Physics 913, Springer (2016) [DOI].
J. Alimena et al., Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider, J. Phys. G 47 (2020) 090501 [arXiv:1903.04497] [INSPIRE].
V.A. Rubakov, Grand unification and heavy axion, JETP Lett. 65 (1997) 621 [hep-ph/9703409] [INSPIRE].
Z. Berezhiani, L. Gianfagna and M. Giannotti, Strong CP problem and mirror world: The Weinberg-Wilczek axion revisited, Phys. Lett. B 500 (2001) 286 [hep-ph/0009290] [INSPIRE].
M.K. Gaillard, M.B. Gavela, R. Houtz, P. Quilez and R. Del Rey, Color unified dynamical axion, Eur. Phys. J. C 78 (2018) 972 [arXiv:1805.06465] [INSPIRE].
P. Agrawal and K. Howe, Factoring the Strong CP Problem, JHEP 12 (2018) 029 [arXiv:1710.04213] [INSPIRE].
M. Bauer, M. Neubert, S. Renner, M. Schnubel and A. Thamm, Flavor probes of axion-like particles, JHEP 09 (2022) 056 [arXiv:2110.10698] [INSPIRE].
CMS collaboration, Search for long-lived particles decaying into muon pairs in proton-proton collisions at \( \sqrt{s} \) = 13 TeV collected with a dedicated high-rate data stream, JHEP 04 (2022) 062 [arXiv:2112.13769] [INSPIRE].
LHCb collaboration, Searches for low-mass dimuon resonances, JHEP 10 (2020) 156 [arXiv:2007.03923] [INSPIRE].
A. Filimonova, R. Schäfer and S. Westhoff, Probing dark sectors with long-lived particles at BELLE II, Phys. Rev. D 101 (2020) 095006 [arXiv:1911.03490] [INSPIRE].
T. Ferber, A. Filimonova, R. Schäfer and S. Westhoff, Displaced or invisible? ALPs from B decays at Belle II, arXiv:2201.06580 [INSPIRE].
A. Ishikawa et al., New pixel detector concept DuTiP for Belle II upgrade and the ILC with an SOI technology, Nucl. Instrum. Meth. A 978 (2020) 164404.
G. Aielli et al., Expression of interest for the CODEX-b detector, Eur. Phys. J. C 80 (2020) 1177 [arXiv:1911.00481] [INSPIRE].
G. Aielli et al., The Road Ahead for CODEX-b, arXiv:2203.07316 [INSPIRE].
C. Bierlich et al., A comprehensive guide to the physics and usage of PYTHIA 8.3, arXiv:2203.11601 [INSPIRE].
LHCb Collaboration, LHCb VELO Upgrade Technical Design Report, LHCB-TDR-013 (2013) [INSPIRE].
LHCb Collaboration, LHCb Tracker Upgrade Technical Design Report, LHCB-TDR-015 (2014) [INSPIRE].
LHCb collaboration, Measurement of the track reconstruction efficiency at LHCb, 2015 JINST 10 P02007 [arXiv:1408.1251] [INSPIRE].
LHCb collaboration, Tracking performance for long-lived particles at LHCb, J. Phys. Conf. Ser. 1525 (2020) 012095 [arXiv:1910.06171] [INSPIRE].
I. Sanderswood et al., One person’s trash is another person’s treasure: expanding physics reach with unused tracks, Talk at Connecting the Dots 2022, June 1 (2022) [https://indico.cern.ch/event/1103637/contributions/4821870/].
LHCb collaboration, LHCb Detector Performance, Int. J. Mod. Phys. A 30 (2015) 1530022 [arXiv:1412.6352] [INSPIRE].
LHCb collaboration, Design and performance of the LHCb trigger and full real-time reconstruction in Run 2 of the LHC, 2019 JINST 14 P04013 [arXiv:1812.10790] [INSPIRE].
LHCb collaboration, Measurement of J/ψ production in pp collisions at \( \sqrt{s} \) = 7 TeV, Eur. Phys. J. C 71 (2011) 1645 [arXiv:1103.0423] [INSPIRE].
LHCb collaboration, Production of J/psi and Upsilon mesons in pp collisions at \( \sqrt{s} \) = 8 TeV, JHEP 06 (2013) 064 [arXiv:1304.6977] [INSPIRE].
LHCb collaboration, Measurement of forward J/ψ production cross-sections in pp collisions at \( \sqrt{s} \) = 13 TeV, JHEP 10 (2015) 172 [Erratum ibid. 05 (2017) 063] [arXiv:1509.00771] [INSPIRE].
HFLAV collaboration, Averages of b-hadron, c-hadron, and τ -lepton properties as of 2018, Eur. Phys. J. C 81 (2021) 226 [arXiv:1909.12524] [INSPIRE].
LHCb Collaboration, LHCb PID Upgrade Technical Design Report, LHCB-TDR-014 (2013).
W. Chen, Y. Jia, Z. Mo, J. Pan and X. Xiong, Four-lepton decays of neutral vector mesons, Phys. Rev. D 104 (2021) 094023 [arXiv:2009.12363] [INSPIRE].
Particle Data Group, Review of Particle Physics, PTEP 2020 (2020) 083C01 [INSPIRE].
M. Alexander et al., Mapping the material in the LHCb vertex locator using secondary hadronic interactions, 2018 JINST 13 P06008 [arXiv:1803.07466] [INSPIRE].
L. Di Luzio, M. Kirk, A. Lenz and T. Rauh, ∆Ms theory precision confronts flavour anomalies, JHEP 12 (2019) 009 [arXiv:1909.11087] [INSPIRE].
LHCb collaboration, Precise determination of the \( {B}_s^0\hbox{--} {\overline{B}}_s^0 \) oscillation frequency, Nature Phys. 18 (2022) 1 [arXiv:2104.04421] [INSPIRE].
EOS Authors, EOS: a software for flavor physics phenomenology, Eur. Phys. J. C 82 (2022) 569 [arXiv:2111.15428] [INSPIRE].
LHCb collaboration, Test of lepton universality in beauty-quark decays, Nature Phys. 18 (2022) 277 [arXiv:2103.11769] [INSPIRE].
LHCb collaboration, Test of lepton universality with B0 → K ∗0 ℓ+ ℓ− decays, JHEP 08 (2017) 055 [arXiv:1705.05802] [INSPIRE].
M.J. Baker et al., The Coannihilation Codex, JHEP 12 (2015) 120 [arXiv:1510.03434] [INSPIRE].
V.V. Khoze, A.D. Plascencia and K. Sakurai, Simplified models of dark matter with a long-lived co-annihilation partner, JHEP 06 (2017) 041 [arXiv:1702.00750] [INSPIRE].
L.J. Hall, K. Jedamzik, J. March-Russell and S.M. West, Freeze-In Production of FIMP Dark Matter, JHEP 03 (2010) 080 [arXiv:0911.1120] [INSPIRE].
G. Guedes and J. Santiago, New leptons with exotic decays: collider limits and dark matter complementarity, JHEP 01 (2022) 111 [arXiv:2107.03429] [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].
M. Acevedo, A. Blackburn, N. Blinov, B. Shuve and M. Stone, Multi-track displaced vertices at B-factories, JHEP 09 (2021) 154 [arXiv:2105.12744] [INSPIRE].
D.B. Kaplan and H. Georgi, SU(2) × U(1) Breaking by Vacuum Misalignment, Phys. Lett. B 136 (1984) 183 [INSPIRE].
D.B. Kaplan, H. Georgi and S. Dimopoulos, Composite Higgs Scalars, Phys. Lett. B 136 (1984) 187 [INSPIRE].
R. Balkin, M. Ruhdorfer, E. Salvioni and A. Weiler, Charged Composite Scalar Dark Matter, JHEP 11 (2017) 094 [arXiv:1707.07685] [INSPIRE].
L. Da Rold and A.N. Rossia, The Minimal Simple Composite Higgs Model, JHEP 12 (2019) 023 [arXiv:1904.02560] [INSPIRE].
M. Ramos, Composite dark matter phenomenology in the presence of lighter degrees of freedom, JHEP 07 (2020) 128 [arXiv:1912.11061] [INSPIRE].
G.F. Giudice, C. Grojean, A. Pomarol and R. Rattazzi, The Strongly-Interacting Light Higgs, JHEP 06 (2007) 045 [hep-ph/0703164] [INSPIRE].
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Vidal, X.C., Mombächer, T., Ramos, M. et al. Following the muon track of hierarchical sectors at LHCb. J. High Energ. Phys. 2022, 27 (2022). https://doi.org/10.1007/JHEP11(2022)027
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DOI: https://doi.org/10.1007/JHEP11(2022)027