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2019:groups:bsm:rdm [2019/06/22 12:15] jose.zurita |
2019:groups:bsm:rdm [2019/06/27 16:45] jose.zurita a |
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Project Acronym: RDM | Project Acronym: RDM | ||
- | Interested people: Benj, Andreas Goudelis, Genevieve Belanger, Dipan Sengupta, Aoife Bharucha, José Zurita. | + | Interested people: Benj, Andreas Goudelis, Genevieve Belanger, Dipan Sengupta, Aoife Bharucha, José Zurita, Jose Miguel No, Jordan Bernigaud, Jan Heisig, Giacomo Polesello, Priscilla Pani, Biplob Bhattacherjee, Andre Lessa, Cedric Delaunay, Adil Jueid. |
- | Feel free to add your name here and edit tasks! | + | [Feel free to add your name here and edit tasks!] |
- | Goal (ambitious): study the interplay between RD anomalies and Dark Matter. | + | Goal (pseudo-ambitious): study the interplay between RD anomalies and Dark Matter. |
Goal (concrete): use the S1 leptoquark model that solves RD and RD* and study the dark matter aspect. | Goal (concrete): use the S1 leptoquark model that solves RD and RD* and study the dark matter aspect. | ||
- | Tasks: | + | Setup: Work in a model with 3 new particles (S1, chi1, chi0) and 3 couplings y^L_{3X}, y^{R}_{23} and y_D. S1 is a scalar leptoquark solving the RD anomalies, chi1 and chi0 are fermions, probably close in mass, with chi0 being a SM singlet, hence chi1 has the same SM gauge charges as S1. |
- | 1- Get a working Lagragian. From private communication with D. Marzocca we need to have both left handed and right handed couplings to S1. Doublet coupling is needed for bL vL, but singlet coupling is fine for cR-tauR. We need a 3rd coupling (y) to chi1-chi0. Persons in charge: Benjamin, Dipan. | + | Tasks (updated from 27.06.2019) |
+ | |||
+ | 1- Existing UFO seems to work. AG wants to check the .fr file. | ||
+ | 2- Flavor constraints: Marco made a survey of existing bounds. To make a long story short | ||
+ | |||
+ | a) D-Dbar mixing is suppressed by theta_C^3 and one chirality flip. Gives no meaningful bounds. | ||
+ | b) Bc -> tau nu, Z->tau tau (1-loop x EFT) give bounds (computed). | ||
+ | c) Sewing altogether the allowed region can be displayed in the yL23-yR33 plane, with the results that yL <= yR. The scaling with S1 mass is seemingly trivial (to be checked). Plot by Marco will come soon (from Davide). Ref point of mS1=1.5 TeV, yL=1=yR solves the RD anomalies | ||
+ | |||
+ | 3) Relic density: from coannihilation, GB says that mchi1=890 and mchi0=800 with yd=1 gives the right relic. Ongoing work (Jan, André, Genevieve) on checking the CDFO. | ||
+ | |||
+ | 4) Recasting collider searches: | ||
+ | i) Benj wants to set-up the recast of the LQ_res + MET search. | ||
+ | ii) Bounds on chi1 come from mono/multi-jet + MET. Some of these were recasted in Fig.7 of [[https://arxiv.org/pdf/1703.00452.pdf|External Link]] | ||
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+ | Tasks (updated, from 25.06.2019): | ||
+ | |||
+ | 1- Expand existing UFO for dark matter: add yD coupling. Make it Micromegas friendly by including tildes for dark particles (see below for details on the model). In charge: Benj,JB, DS | ||
+ | * FeynRules implementation (v2) + toy mathematica notebook: {{ 2019:groups:bsm:lqdm.fr.v2.tgz | here}}. | ||
+ | * CalcHEP/UFO v2 files: {{ 2019:groups:bsm:lqdm.ch.v2.tgz | CH}} and {{ 2019:groups:bsm:lqdm.ufo.v2.tgz | UFO}}. | ||
+ | |||
+ | 2- Check flavor constraints: how much can we relax y^L_{3X}, y^{R}_{23} / mS1^2 = 1/(4 TeV^2)? Interest is to lower mS1 and the couplings as much as possible without colliding with other flavor bounds coming from e.g: D-Dbar mixing (that would apply on combinations of couplings and masses, y^{R}_{23}^2 / mS1^2 ). Persons in charge: MN, JB, AB | ||
+ | |||
+ | 3- Monojet bounds on chi1: Assuming that chi1 decays are soft an go undetected, there will be ***unavoidable*** direct bounds from monojets on the mchi1 mass [Note that in the simplified model chi1 decays 100% into chi0 + SM particles, so there is no branching ratio dillution here). Persons in charge: JZ, DS, AL | ||
+ | |||
+ | 4- *** NEW ***: There will be constraints from gq -> l + S1 (also in principle gq -> LQ + q + l is possible, but this is suppressed by being a 2-> process instead of a 2->3 one). Persons in charge: GP, AL, JZ | ||
+ | |||
+ | 5- Relic density: We will in principle have two possible production freeze-out modes: either co-annihilation (CA) or conversion-driven (CD). Once #1 is solved, this can be investigated with micromegas (CA) or by private Jan's code (CD). Persons in charge: GB, AG, JMN, DS, JH | ||
+ | |||
+ | 6- Direct-detection (1-loop induced): This is in principle implemented in Micromegas, so it should be easy to check. Person in charge: GB, AG, DS. | ||
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+ | ------------------------------------------------------------------ | ||
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+ | Tasks (from 20.06.2019 meeting): | ||
+ | |||
+ | 1- Get a working Lagrangian. From private communication with D. Marzocca we need to have both left handed and right handed couplings to S1. The dark sector includes a chi1 (coloured and charged) and a chi0 (singlet) field. The implementation include LQ couplings to lepton and quark doublets (bL-vL) and LQ couplings to the lepton and quark singlets (cR-tauR). The model finally includes a 3rd coupling (yDM) to the chi1-chi0 pair. Persons in charge: Benjamin, Dipan. | ||
+ | * A FeynRules implementation is now available and can be downlaoded from {{ 2019:groups:bsm:lqdm.fr.tgz | here}}. The tarball contains the SM implementation (sm.fr), the new physics sector implementation (lqdm.fr) and a toy mathematica notebook (use-LQDM.nb). | ||
+ | * The provided mathematica notebook has been used to generate {{ 2019:groups:bsm:lqdm.ufo.tgz | UFO}} and {{ 2019:groups:bsm:lqdm.ch.tgz | CalcHep}} model files. | ||
+ | * Here is a {{ 2019:groups:bsm:note_benj.pdf | note }} detailing what has been implemented. The {{ 2019:groups:bsm:note_benj.tex | TeX }} version is also available. | ||
+ | * Important message from Benj: **The model still needs to be double-checked by an independent pair of eyes!** | ||
2- RD explained by mS1=2 TeV, and both lq couplings being 1. (From D. Marzocca). Anomaly explained by lambda_bv * lambda_ctau / mS1^2. | 2- RD explained by mS1=2 TeV, and both lq couplings being 1. (From D. Marzocca). Anomaly explained by lambda_bv * lambda_ctau / mS1^2. | ||
- | 3- Study bounds from direct detection. These happen at the 1-loop level, expressions known in literature for the SUSY case. In charge: Genevieve, Andreas, Dipan. | + | 3- Study bounds from direct detection. These happen at the 1-loop level, expressions known in literature for the SUSY case. In charge: Genevieve, Andreas, Dipan, Jose Miguel. |
4- look into CMS search for LQ + MET (motivated by the “Coannihilation Codex”) and for existing searches constraining chi1. In charge: Aoife, José. | 4- look into CMS search for LQ + MET (motivated by the “Coannihilation Codex”) and for existing searches constraining chi1. In charge: Aoife, José. | ||
- | 5- study relic density (after 1-4 are done). | + | 5- study relic density (after 1-4 are done). Jan |
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+ | ** References ** | ||
+ | |||
+ | [[https://arxiv.org/pdf/1902.01789.pdf|1902.01789]] | ||
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+ | [[https://arxiv.org/pdf/1808.08179.pdf|1808.0819]] | ||
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+ | [[https://arxiv.org/pdf/1704.05849.pdf|1704.05849]] | ||
+ | |||
+ | [[https://arxiv.org/pdf/1608.07583.pdf|1608.07583]] | ||
+ | [[https://arxiv.org/pdf/1811.10151.pdf|CMS-EXO-17-015]] | ||
+ | [[https://indico.in2p3.fr/event/17790/sessions/10839/attachments/50940/65234/Stangl_1811_Arles_NP_models.pdf|Zoology of New Physics Models for the Flavour Anomalies]] |