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SUSY searches using Vector Boson Fusion processes in the LHC Departamento de Física Bogotá, Colombia Andrés Leonardo Cabrera Mora Andrés Flórez, Bernardo.

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Presentation on theme: "SUSY searches using Vector Boson Fusion processes in the LHC Departamento de Física Bogotá, Colombia Andrés Leonardo Cabrera Mora Andrés Flórez, Bernardo."— Presentation transcript:

1 SUSY searches using Vector Boson Fusion processes in the LHC Departamento de Física Bogotá, Colombia Andrés Leonardo Cabrera Mora Andrés Flórez, Bernardo Gómez

2 ACTIVITIES AT CERN FOR RPC GROUP FROM CMS EXPERIMENT

3 Skew and Delay Test for the RPC Signal Cables CABLE NAMEDELAYMAX SKEWRESULT RE+4/3/11/A1/CA1/X4A51_i/L9/J168,780,85OK RE+4/3/11/A2/CA1/X4A51_i/L9/J268,750,78OK RE+4/3/11/B1/CA1/X4A51_i/L9/J363,510,73OK RE+4/3/11/B2/CA1/X4A51_i/L9/J463,630,76OK RE+4/3/11/C1/CA1/X4A51_i/L9/J563,430,79OK RE+4/3/11/C2/CA1/X4A51_i/L9/J663,510,69OK RE+4/3/12/C2/CA1/X4A51_i/L17/J656,790,72OK RE+4/3/12/C1/CA1/X4A51_i/L17/J556,90,73OK RE+4/3/12/B2/CA1/X4A51_i/L17/J456,880,68OK RE+4/3/12/B1/CA1/X4A51_i/L17/J356,830,68OK RE+4/3/12/A2/CA1/X4A51_i/L17/J261,980,81OK RE+4/3/12/A1/CA1/X4A51_i/L17/J162,060,73OK RE+4/3/24/C2/CA1/X2A52_d/L17/J643,490,62OK RE+4/3/24/C1/CA1/X2A52_d/L17/J543,540,48OK RE+4/3/24/B2/CA1/X2A52_d/L17/J443,480,56OK RE+4/3/24/B1/CA1/X2A52_d/L17/J343,630,55OK RE+4/3/24/A2/CA1/X2A52_d/L17/J248,680,57OK RE+4/3/24/A1/CA1/X2A52_d/L17/J148,750,62OK RE+4/3/22/A1/CA1/X2A52_d/L8/J133,240,32OK RE+4/3/22/A2/CA1/X2A52_d/L8/J233,260,36OK RE+4/3/22/B1/CA1/X2A52_d/L8/J328,260,47OK RE+4/3/22/B2/CA1/X2A52_d/L8/J428,180,32OK RE+4/3/22/C1/CA1/X2A52_d/L8/J528,240,42OK RE+4/3/22/C2/CA1/X2A52_d/L8/J628,210,28OK Cables tested: 864 Example of the test

4 Test of HV Adaptors for RPC V 0 = 15 KV I 0 = 3μA Trip Time = 3 sec 0< I < 0.2 μA Tripolar connector Jupiter connector Fast Test (30 min)Long Test (48 hours) I0Set (uA) Vmon (V) Imon (uA) Trip Time (sec) Trip ?Test I0Set (uA) Vmon (V) Imon (uA) Trip Time (sec) Trip ?TestReason Adaptor ,13NoOk ,893NoFailI >0,3 Adaptor ,13NoOk NoFailI >0,3 Adaptor ,13NoOk NoOk Adaptor NoOk NoOk Adaptor ,23NoOk NoOk Adaptor ,13NoOk ,13NoOk Adaptor ,13NoOk NoOk Adaptor ,13NoOk NoOk Adaptor ,13NoOk NoOk Adaptor NoOk NoOk Adaptor ,23NoOk ,23NoOk Adaptor NoOk NoOk Adaptor ,13NoOk NoOk Adaptor ,13NoOk NoOk Adaptor NoOk3503YesFailTripped Adaptor NoOk ,23NoFailTripped Adaptor ,13NoOk NoOk Adaptor NoOk ,33NoOk

5 Adaptor HV Cable Test of HV Cables Fast Test (30 min) V 0 = 15 KV I 0 = 3μA Trip Time = 3 sec 0< I < 0.2 μA Long Test (48 hours) V 0 = 12 KV I 0 = 3μA Trip Time = 3 sec 0< I < 0.3 μA

6 Reshuffling code for the RPC HV System Task – Reshuffle endcap HV cables (RE1, RE2, RE3) to group chambers with close working points. Goal – Bring actual working point for every chamber close to ideal WP to increase overall chamber efficiency. Distributors (Back) Distributors (Front)

7 Installation of RPC Signal Cable for RE+4. Participation in the installation of the signal cables for the RE+4 – In the rack side – In the chamber side

8 Gas leak search for the RPC Gas Pipes Search of gas leaks in the RPC gas pipes Leak Measurement using: – Ar gas with Pico data loggerPico data logger – Leak Box – N2H2 gas – Hydrogen Leak Detector (H2000+) Some results: W L/h -> 160 L/h

9 ANALYSIS WORK

10   Forward tagging jets MET + jj + muons   Search of Dark Matter at the LHC in VBF processes using SUSY models.

11 VFB Jets VBF related distributions for V + jets and VBF production of a chargino pair. As expected, the jets in V + jets events are mostly central and have small dijet invariant masses.

12 VFB Jets VBF related distributions for V + jets and VBF production of a chargino pair. The outgoing partons in VBF processes must carry relatively large pT

13 Missing Transverse Energy

14 Strategy Presence of two energetic jets in the forward direction in opposite hemispheres, and with large dijet invariant mass. Relatively high Missing ET requirement is imposed due to the presence of the LSP Two muons in the final state are expected for this channel VBF SUSY production cross-sections are relatively small

15 Work already done Git account Andres Florez tutorial of the code – source setupCode_5_3_11_patch6.sh Grid certificate Come back to CERN by the end of January

16 Conclusions Ready to work¡¡¡

17 BACKUP SLIDES

18 18

19 Figure 1: Diagrams of chargino-neutralino and chargino- chargino pair production through vector boson fusion followed by their decays to leptons and a LSP.

20 Results 2012

21 Lo que conocemos Toda la materia que conocemos compone el 4% de la materia total del universo (protones, neutrones, electrones, etc) ¿Dónde esta el resto? 74 % Dark Energy 22 % Materia Oscura 21

22 WHAT’S OUT THERE? Astronomy tells us: The matter we know (i.e. protons, neutrons and electrons) accounts for just 5% of the universe The rest is dark matter And dark energy SLAC/Nicole Rager

23 Composición de la materia BosonesFermiones QuarksLeptones Modelo Estándar Supercompañero Boson Fermion Masas Grandes 23

24 Composición de la materia BosonesFermiones QuarksLeptones Modelo Estándar Supercompañero Boson Fermion Masas Grandes 24

25 Paridad R La partícula supersimétrica mas liviana (LSP) es estable El decaimiento de productos de spartículas debe contener un número impar de LSPs. Las supercompañeras de las partículas del SM deben ser producidas en pares. 25

26 Objetivo Buscar Materia Oscura en el LHC asociada a procesos VFB utilizando modelos Supersimétricos.

27 Parámetro η : La seudorapidez 27

28 Results 2012 Di-photon (γγ ) invariant mass distribution for the CMS data of 2011 and 2012 (black points with error bars). The data are weighted by the signal to background ratio for each sub- category of events. The solid red line shows the fit result for signal plus background; the dashed red line shows only the background.

29 Matter composition BosonsFermions QuarksLepton Standard Model 29

30 Matter composition BosonsFermions QuarksLepton Standard Model S-Boson S-Fermion 30

31 WHAT’S OUT THERE? The matter we know (i.e. protons, neutrons and electrons) accounts for just 4% of the universe The rest is: 74 % Dark Energy 22 % Materia Oscura 31

32 Supersimetría Theoretical problems of the SM Candidate to Dark Matter (LSP) 32

33 Matter composition BosonsFermions QuarksLepton Standard Model S-Boson S-Fermion 33 Big Mass

34 R - Parity The lightest susy particle (LSP) is stable by conservation of R parity. Decays products of s-particles should contain an odd number of LSPs. The superpartners of the SM are produced in pairs. 34

35 Classic Setting (Model Dependent) Exclusion Limits for squarks and gluinos. 1.5 TeV 95%

36 Work already done Git account Andres Florez tutorial of the code – source setupCode_5_3_11_patch6.sh Grid certificate Crab?? Run the code??

37 Physics Object Reconstruction: Electrons

38 Muon Reconstruction and Identification

39 Missing Transverse Energy 39

40 η: Pseudorapidity 40

41 Software Requirements MC Generator: POWHEG, MADGRAPH, TAUOLA, Pythia,etc. Analysis software: CMSSW, Root, etc. Object Reconstruction: Criteria selection defined by CMS

42 Physics Object Reconstruction: Jets 42 anti-kT clustering algorithm with a reconstruction cone of R = 0.5 is used

43 Previous Results Number of observed events in data and estimated background rates in the search region. The numbers are for L = 10.9 fb -1

44 Conclusions The observed number of events in the signal regions shown do not reveal any evidence for VBF SUSY production. The results are presented in the context of the R-parity conserving Minimal Supersymmetric Standard Model and considering cases such as VBF electroweak production of charginos and neutralinos. VBF offers a powerful way to “directly” probe EWK SUSY at the LHC. Direct window to determination the composition of the LSP.

45 Main Purpose Search of Dark Matter at the LHC in VBF processes using SUSY models.


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