eptoquark manoeuvres in the dark: a simultaneous solution of the dark matter problem and the R-D({*}) anomalie

Author(s):Show less -

Belanger, Genevieve ^[1] ; Bharucha, Aoife ^[2] ; Fuks, Benjamin ^{[3, 4]} ; Goudelis, Andreas ^[5] ; Heisig, Jan ^{[6, 7]} ; Jueid, Adil ^{[8, 9]} ; Lessa, Andre ^[10] ; Mohan, Kirtimaan A. ^[11] ; Polesello, Giacomo ^[12] ; Pani, Priscilla ^[13] ; Pukhov, Alexander ^[14] ; Sengupta, Dipan ^[15] ; Zurita, Jose ^[16]

Affiliation:Show less -

^[1] Univ Grenoble Alpes, CNRS, USMB, LAPTh, 9 Chemin Bellevue, F-74940 Annecy - France

^[2] Aix Marseille Univ, Univ Toulon, CPT, CNRS, Marseille - France

^[3] CNRS, 4 Pl Jussieu, F-75252 Paris 05 - France

^[4] Sorbonne Univ, Lab Phys Th & Rique & Hautes Energies LPTHE, UMR 7589, 4 Pl Jussieu, F-75252 Paris 05 - France

^[5] Univ Clermont Auvergne, IN2P3, Lab Phys Clermont UMR 6533, CNRS, 4 Av Blaise Pascal, F-63178 Aubiere - France

^[6] Rhein Westfal TH Aachen, Inst Theoret Particle Phys & Cosmol, Sommerfeldstr 16, D-52056 Aachen - Germany

^[7] Catholic Univ Louvain, Ctr Cosmol, Particle Phys & Phenomenol CP3, Chemin Cyclotron 2, B-1348 Louvain La Neuve - Belgium

^[8] Quantum Universe Ctr, Korea Inst Adv Study, Seoul 02455 - South Korea

^[9] Konkuk Univ, Sch Phys, Seoul 05029 - South Korea

^[10] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210580 Santo Andre, SP - Brazil

^[11] Dept Phys & Astron, 567 Wilson Rd, E Lansing, MI 48824 - USA

^[12] Ist Nazl Fis Nucl, Sez Pavia, Via Bassi 6, I-27100 Pavia - Italy

^[13] DESY, DESY, D-15738 Zeuthen - Germany

^[14] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119992 - Russia

^[15] Univ Calif San Diego, Dept Phys & Astron, 9500 Gilman Dr, San Diego, CA - USA

^[16] Univ Valencia, Inst Fis Corpuscular, CSIC, E-46980 Valencia - Spain

• Document type: Journal article
• Source: Journal of High Energy Physics; n. 2 FEB 7 2022.
• Web of Science Citations: 0

Abstract

The measured branching fractions of B-mesons into leptonic final states derived by the LHCb, Belle and BaBar collaborations hint towards the breakdown of lepton flavour universality. In this work we take at face value the so-called R-D((){*}()) observables that are defined as the ratios of neutral B-meson charged-current decays into a D-({*}())-meson, a charged lepton and a neutrino final state in the tau and light lepton channels. A well-studied and simple solution to this charged current anomaly is to introduce a scalar leptoquark S-1 that couples to the second and third generation of fermions. We investigate how S-1 can also serve as a mediator between the Standard Model and a dark sector. We study this scenario in detail and estimate the constraints arising from collider searches for leptoquarks, collider searches for missing energy signals, direct detection experiments and the dark matter relic abundance. We stress that the production of a pair of leptoquarks that decays into different final states (i.e. the commonly called ``mixed{''} channels) provides critical information for identifying the underlying dynamics, and we exemplify this by studying the t tau b nu and the resonant S-1 plus missing energy channels. We find that direct detection data provides non-negligible constraints on the leptoquark coupling to the dark sector, which in turn affects the relic abundance. We also show that the correct relic abundance can not only arise via standard freeze-out, but also through conversion-driven freeze-out. We illustrate the rich phenomenology of the model with a few selected benchmark points, providing a broad stroke of the interesting connection between lepton flavour universality violation and dark matter. (AU)

• FAPESP's process: 15/20570-1 - Exploring LHC results with simplified models and beyond
• Grantee: André Paniago Lessa
• Support Opportunities: Research Grants - Young Investigators Grants