May 2015 Boosted Systems at the LHC

Transcription

1 Boosted Systems at the LHC Teruki Kamon Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University & Kyungpook National University Mini CMS Workshop Meeting on Boosted Systems May 23, 2015 May 2015 Boosted Systems at the LHC 1

2 BSM Landscape Z Extra U(1) is a very common outcome from string-inspired model MSSM Higgs (e.g., A H and H + H - ), Non-MSSM Higgs Gluinos Heavier(?) 1 st /2 nd generation scalar quarks (squaks) Lighter(?) 3 rd generation squarks (stop, sbottom) Charginos (C1, C2), Neutralinos (N1, N2, N3, N4), decaying into: Leptons, Higgs, W, Z LSP? Lightest Neutralino (N1): Bino-like, Wino-like, Higgsino-like, Bino- Higgsino-like.. [Example] Higgsino LSP chargino and neutralinos below 200 GeV, with mass splittings of order 10 GeV. It is very difficult for LHC to observe these particles. Gravitino Sleptons Selectrons and smuons are mass degenerate. Special case: Stau is lighter. Disappearing Tracks, LL Dark matter connection Compressed scenarios at hadron collides 2

3 Theme of Boosted Systems Boosted System? tau is highly boosted in Z decay top is highly boosted in non-thermal DM model We want to create boosted system for compressed mass spectra scenarios via ISR jet(s) and/or VBF dijets. VBF jj + stop ISR jet + stop ISR g + stop Disappearing Tracks with VBF jj (vs. with ISR jet) LL this is not a boosted system. But an interesting final state 3

4 Examples of SUSY Probe Metric Teruki Kamon 4

5 Brief History BSM3G WG Testing models with tau, b, and/or top Early History Z tautau Exo Tau SUSY RA2tau SUSY Tau SUSY Tau + VBF + DM Z analysis was a founding body of this group, where we started with tau objects Alfredo Gurrola (TAMU), Andres Florez (Vanderbilt), Nitish Dhingra (Tata), Francesco Romeo (INFN), Recruiting / Training PHENO Topics No pre-setting. Dynamically evolving! o o The VBF analysis started because of null results on SUSY and the discovery of a Higgs boson A variable E(b)/E(top) for top chirality in monotop events is now discussed after we saw a difference in pt distribution of b quark from top decay between MG5 and PYTHIA8 which doesn t care of the chirality. 5

6 Ph.D. Theses 6

7 Important Transition Period [1] 8-TeV Analyses: SUS SUS EXO (RPV stop/lq3 in all-hadronic ditau channel) Stop(C1 + b tau N1 + b) via SHyFT Z tautau [2] 13-TeV VBF trigger Signal samples Validation on 3G pattuples Contacts for Tau POG 7

8 VBF + Muon Trigger Run 2 Preparation Amandeep and Sho drivers of this new menu. Amandeep was LPC Short-Term Visitor. Leonardo and Ali next generation Tau POG AndresF, Alfredo, Francesco experts Analyses Z VBF EWKinos VBF DM VBF stop/sbottom VBF + disappearing tracks 8

9 VBF Cross Sections PRL 111 (2013) Tathagata Ghosh 8 TeV 14 TeV 100 TeV 9

10 VBF + Disappearing Tracks (DTs) jj+met+x The final state is same as invisible Higgs signal, but, larger p T jets Cross sections? Wino-like DM Higgsino-like DM Bino-Higgsino DM Feasibility? ~50 GeV Wino-DM at 8 TeV?? GeV Wino-DM at 14 TeV?? GeV Wino-DM at 100 TeV More? Example, disappearing tracks (DTs)? 10

11 Wino DM with ISR, VBF and DT Marco Cirelli, Filippo Sala, Marco Taoso, Wino-like Minimal Dark Matter and future colliders, JHEP 10 (2014) 033, Erratum-ibid. 01 (2015) 041 [arxiv: v2] ISR Jet VBF Dijet DTs! 11

12 Students for Run 2 Peking (Qiang Li) - Xiaoqing Yuan ( 袁晓庆 ). Panjab (Jasbir Singh) - Priyanka Kumari Los Andes (Carlos Avila, Juan Carlos, Andres Florez) Carlos Felipe Gonzalez Hernandez, Andres Leonardo Cabrera Mora INFN (Francesco ROMEO (IHEP, China)) - Roberto Leonardi and Luisa Alunni Solestizi Colorado (John Cumalat) - AJ Johnson Vanderbilt (Alfredo) <to be filled> TAMU (TK, Misha) Ali Celik, Ryan Mueller Hamburg (Christian) <probably a new postdoc in September 2015> My apologies for an incomplete list of names. 12

13 Run 2 New Era April 5 Splash May 20 First 13-TeV Test Collisions 13

14 Welcome! Teşekkür ederim From Alfredo s slide 14