CEνNS: Models. Bhaskar Dutta Texas A&M University

Transcription

1 CEνNS: Models Bhaskar Dutta Texas A&M University 1

2 Introduction ν s are investigating new physics at CEνNS experiments (stopped pion, reactors): COHERENT, CONUS, MINER, CONIE etc. Many interesting ideas can be probed involving high and low mass mediators This talk will cover low mass mediators at CEνNS experiments (not easy scenarios for the LHC) 1) Parameter space of Z- ZZ mixing, L µ -L τ models 2) Hidden sector model effects 3) Low mass DM models associated with new symmetry scale 4) Charged particles as signals in some DM scenarios 2

3 Models: Kinetic mixing L iiiiii = gg cc cc αα (tt αα εε ss ww )(ττ 3LL tt αα εε/ ss ww ss 2 ww tt αα εε ss ww QQ)ZZ μμ ffγγ μμ ff ww ss αα : Z-Z mass mixing 1. Dark Z boson: α small, coupling: iiiitttttttt ww (YY ff /2)εε BB 2. Dark hypercharge boson: ϵ small, coupling: iigg cc ww εε ZZ (ττ 3LL ss ww 2 QQ) εε ZZ ss αα 3

4 Kinetic mixing εε BB εε ZZ MM (MMMMMM) MM (MMMMMM) Abdullah, Dent, Dutta, Liao, Kane, Strigari, 18 4

5 Models: Kinetic mixing Kinetic mixing arises in many models. M-theory compactified on G 2 holonomy Visible sector DM decays to hidden sector Acharya, Ellis, Kane, Nelson, Perry, 18 5

6 Lµ-Lτ U(1) µ τ symmetry Models [Neutrino flavor structures: He, Joshi, Lew, Volkas, 91] gg ZZZ ν µ : no reactor constraint MM (MMMMMM) Abdullah, Dent, Dutta, Liao, Kane, Strigari, 18 6

7 U(1) T3R Model for a sub GeV DM can be probed. E.g., there may be a new symmetry breaking scale around GeV 2 nd and 1 st generation fermion masses ( ~MeV to few GeV) Anomaly free SU(2) L U(1) Y U(1) T3R Z Low mass dark matter, gauge Boson, scalar ZZ Predictions are testable at direct detection, coherent experiments, Various low energy experiments Dutta, Ghosh, Kumar: to appear 7

8 U(1) T3R Scalar ϕ vev breaks U(1) T3R to Z 2, vev is around GeV ZZ mixes with Z, photons at one loop: Constraints from COHERENT, B-factories, g-2 etc. on the gauge coupling (g T3R ) Satisfy fermion masses and obey the constraints of light scalar Yukawa couplings (λ i ): Low energy experiments ηη is odd under parity: Dark Matter with sub GeV mass 8

9 Hidden Sector: Form factor Hidden sector fermions χ: ZZ couples directly to χ and leptons Datta, Duraisamy, Ghosh 13, Datta, Kumar, Liao, Marfatia, 17 Elor, Liu, Slatyer, Soreq, 18 Quark coupling with χ is due to this operator: For Scalar (S) mediator 9

10 Form factor FF qq 2, Λ 2 = qq2 Λ 2 vector Scalar F(q 2 )=1 Datta, Dutta, Liao, Marfatia, Strigari 18 10

11 Form factor Recoil Spectrum Scalar Vector Detector: Ar, Λ=100 MeV Datta, Dutta, Liao, Marfatia, Strigari 18 11

12 Form factor: B anom.&ceνns Light mediators are good for: Datta, Kumar, Liao, Marfatia, 17 b s χ Z g bs ~ 10-8 gg μμ~10 3 Explains (g-2) µ CEνNS measures f(g 1 g µ, Μ ) g 1 : first generation quark coupling with Z Combining the signal & the CEνNS constraint: gg bbbb gg 11 ~ (for MM = MMMMMM) B-anomalies CEνNS In realistic models: g bs g 1 Datta, Dutta, Liao, Marfatia, Strigari, 18 12

13 e + e - from the scattering Dark sector consists of dark matter particle χ 1 and an unstable particle χ 2 χ 2 is heavier than χ 1 and decays into SM particles + χ 1 Many authors: Finkbeiner, Weiner, Chang, Kribs, Tucker-Smith, Slatyer, Pospelov, Yavin, Poland, Randall, Cui, Morissey, Dienes, Thomas, Kumar, Kim, Park, Shin Production of χ 1 at COHERENT Deniverville, Pospelov, Ritz, 15 13

14 e + e - from the scattering Three visible particles (recoil ~ 1-20 MeV) e + e - pair can be displaced (parameter choice) Dutta, Kim, Park, Shin, Tayloe, In Progress 14

15 Outlook CEνNS probes new physics models associated with ν interactions Models with heavy/light mediators are probed: Investigates the gap 1 MeV-10 GeV where the collider bounds are not applicable Probes many interesting ideas, e.g., L µ -L τ, Hidden sector, Low mass DM, Multicomponent dark matter models etc. Existence of sterile neutrino can be probed: MiniBooNE + LSND excess (Joel Walker s talk) 15