Probing SUSY Dark Matter with Vector Boson Fusion at the LHC
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1 Probing SUSY Dark Matter with Vector Boson Fusion at the LHC Alfredo Gurrola (Vanderbilt University) 1 Snowmass Meeting
2 Particle Physics & Cosmology The identity of dark matter is one of the most profound questions at the interface of particle physics and cosmology. pure Bino pure Wino pure Higgsino 2 Snowmass Meeting
3 Particle Physics & Cosmology How much Bino, Wino, and Higgsino for the DM? It is important to directly probe the EWK SUSY sector in order to determine their DM connection 3 Snowmass Meeting
4 Current Dark Matter Searches Cascade decay of heavier particles to the DM particle Signature: Large MET + jets (+ leptons) (+ photons) DM particles directly produced in pairs after ISR Signature: Large MET + mono-jet (mono-z, etc.) 4 Snowmass Meeting
5 Classic SUSY DM Searches Determining the mass and content of the LSP requires model dependent correlations between colored and non-colored sector (e.g. grand unification in msugra) ATLAS and CMS pushing limits on 1 st /2 nd squarks and gluinos to ~ 1.5 TeV 5 Snowmass Meeting
6 What do we know so far? Key points: No SUSY yet & 126 GeV Higgs 6 Snowmass Meeting
7 What do we know so far? From Michael Peskin s talk (Craig et al arxiv: ) 7 Nightmare compressed scenario is starting to look like the actual scenario Snowmass Meeting Becoming EXPERIMENTALLY difficult to search for dark matter through cascade decays (e.g. how to trigger?)
8 Probing DM with VBF Cold dark matter candidate ~ 0 ~ 1 0 ~ 1 Z / h / ~ 0 Z / h / 0 ~ 1 0 ~ 1 Forward tagging jets f MET + jj 8 Snowmass Meeting h
9 Probing DM with VBF 9 Snowmass Meeting 5/6/2013
10 Probing DM with VBF 10 Snowmass Meeting 5/6/2013
11 Probing DM with VBF Cold dark matter candidate ~ 0 ~ 1 0 ~ 1 Z / h / ~ 0 Z / h / 0 ~ 1 0 ~ 1 Depending on whether CDM is Bino, Wino, Higgsino (and C1 Wino/Higgsino), or mixture will enhance/suppress these diagrams to dominate the cross-section 11 e.g. CDM=Wino, C1=Wino WW diagrams dominate W luminosity is largest expect Wino+Wino case to give us largest x-section Snowmass Meeting
12 Probing DM with VBF Pure Wino/Higgsino dark matter scenarios are special ~ 0 ~ 1 ~ 1 M M ~ M ~ 0 ( 1 ) ( 1 ) ~ 100 MeV Br( ~ ~ 0 ) ~ 100% P T ( 1 1 ) ~ M ~ 100 MeV Final state once again jj+met! ~ ~ 0 jj, ~ ~ jj also contribute! 12 Snowmass Meeting
13 Probing DM with VBF MADGRAPH5 13 Snowmass Meeting
14 Backgrounds Z nn + jets, irreducible background Large MET from the neutrinos Rely heavily on VBF to reduce this BG W mn + jets, lost leptons e,m,t fall outside detector acceptance e,m,t fail identification criteria Suppressed by l vetoes, VBF, and MET cuts Top pair Suppressed by l vetoes, central jet veto, VBF cuts, and MET cut 14 Snowmass Meeting
15 VBF DM Kinematics MADGRAPH5 + PGS4 15 Snowmass Meeting
16 Feasibility & Reach Forward tagging jets h Two lead jets w/ pt > 50, h < 5 h(j,j) > 4.2 & M(j,j) > 1500 Veto on leptons (e,m,t) & b-jets Central jet veto: no 3 rd jet w/ h 1 < h 3 < h 2 MET > X optimized for each mass 1000 fb -1, 5s obtained up to a Wino mass of ~ 600 NOTE: represents best case scenario Final performance to depend on the planned upgrades for ATLAS & CMS (e.g. large PU studies) 16 Snowmass Meeting
17 VBF DM Cosmology LSP has large Wino/Higgsino component LSP annihilation cross section is too large to fit observed DM relic density LSP is mostly Bino LSP annihilation cross section is too small to fit observed DM relic density Some problems can be solved if the DM is nonthermal. For thermal DM, some problems can be solved by adding coannhilation, resonance effects, etc. Determining the composition of the LSP for a given mass is very important to understand early universe cosmology 17 Snowmass Meeting
18 DM Relic Density Simultaneously fit the MET shape and observed rate in data to extract the mass and composition of the LSP DarkSUSY 2 LSP h f [ F%, m( LSP)] Mass and composition of the LSP used to determine the LSP relic density 18 Snowmass Meeting
19 Summary Vector boson fusion offers a powerful way to directly probe SUSY dark matter at the LHC Compliments current mono-x searches as well as classic SUSY searches Many advantages: 19 largely agnostic about the colored sector Direct window to determination the composition of the LSP Unique tool at the LHC to directly access DM and compressed spectra with an experimentally plausible trigger Feasibility study shows that we can probe e.g. Wino masses up to ~ 600 GeV at the 5s level with 1000 fb -1 of 14 TeV data Represents best case scenario e.g need to study large PU environment Relic density can be determined to ~20% (40%) accuracy at 500 fb -1 for the pure Wino (Higgsino) dark matter scenario Hope to use this study to push detector upgrade studies in the right direction Snowmass Meeting
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