susy searches using vector boson fusion processes in the lhc
DESCRIPTION
SUSY searches using Vector Boson Fusion processes in the LHC. Andrés Leonardo Cabrera Mora Andrés Flórez , Bernardo Gómez. Departamento de Física Bogotá , Colombia. activities at CERN for RPC Group from CMS Experiment. Skew and Delay Test for the RPC Signal Cables. - PowerPoint PPT PresentationTRANSCRIPT
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SUSY searches using Vector Boson Fusion processes in the LHC
Departamento de FísicaBogotá, Colombia
Andrés Leonardo Cabrera MoraAndrés Flórez , Bernardo Gómez
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ACTIVITIES AT CERN FOR RPC GROUP FROM CMS EXPERIMENT
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Skew and Delay Test for the RPC Signal Cables
CABLE NAME DELAY MAX SKEW RESULTRE+4/3/11/A1/CA1/X4A51_i/L9/J1 68,78 0,85 OKRE+4/3/11/A2/CA1/X4A51_i/L9/J2 68,75 0,78 OKRE+4/3/11/B1/CA1/X4A51_i/L9/J3 63,51 0,73 OKRE+4/3/11/B2/CA1/X4A51_i/L9/J4 63,63 0,76 OKRE+4/3/11/C1/CA1/X4A51_i/L9/J5 63,43 0,79 OKRE+4/3/11/C2/CA1/X4A51_i/L9/J6 63,51 0,69 OK
RE+4/3/12/C2/CA1/X4A51_i/L17/J6 56,79 0,72 OK
RE+4/3/12/C1/CA1/X4A51_i/L17/J5 56,9 0,73 OKRE+4/3/12/B2/CA1/X4A51_i/L17/J4 56,88 0,68 OKRE+4/3/12/B1/CA1/X4A51_i/L17/J3 56,83 0,68 OKRE+4/3/12/A2/CA1/X4A51_i/L17/J2 61,98 0,81 OKRE+4/3/12/A1/CA1/X4A51_i/L17/J1 62,06 0,73 OK
RE+4/3/24/C2/CA1/X2A52_d/L17/J6 43,49 0,62 OKRE+4/3/24/C1/CA1/X2A52_d/L17/J5 43,54 0,48 OKRE+4/3/24/B2/CA1/X2A52_d/L17/J4 43,48 0,56 OKRE+4/3/24/B1/CA1/X2A52_d/L17/J3 43,63 0,55 OKRE+4/3/24/A2/CA1/X2A52_d/L17/J2 48,68 0,57 OKRE+4/3/24/A1/CA1/X2A52_d/L17/J1 48,75 0,62 OK
RE+4/3/22/A1/CA1/X2A52_d/L8/J1 33,24 0,32 OKRE+4/3/22/A2/CA1/X2A52_d/L8/J2 33,26 0,36 OKRE+4/3/22/B1/CA1/X2A52_d/L8/J3 28,26 0,47 OKRE+4/3/22/B2/CA1/X2A52_d/L8/J4 28,18 0,32 OKRE+4/3/22/C1/CA1/X2A52_d/L8/J5 28,24 0,42 OKRE+4/3/22/C2/CA1/X2A52_d/L8/J6 28,21 0,28 OK
Cables tested: 864Example of the test
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Test of HV Adaptors for RPC
V0 = 15 KVI0 = 3μATrip Time = 3 sec0< 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 ? Test Reason
Adaptor 1 3 14998 0,1 3 No Ok 3 12003 0,89 3 No Fail I >0,3Adaptor 1 3 14997 0,1 3 No Ok 3 12003 0 3 No Fail I >0,3Adaptor 2 3 14998 0,1 3 No Ok 3 12004 0 3 No Ok Adaptor 2 3 14998 0 3 No Ok 3 12000 0 3 No Ok Adaptor 3 3 15000 0,2 3 No Ok 3 11998 0 3 No Ok Adaptor 3 3 14998 0,1 3 No Ok 3 11998 0,1 3 No Ok Adaptor 4 3 14998 0,1 3 No Ok 3 12013 0 3 No Ok Adaptor 4 3 14997 0,1 3 No Ok 3 12008 0 3 No Ok Adaptor 5 3 14999 0,1 3 No Ok 3 12014 0 3 No Ok Adaptor 5 3 14998 0 3 No Ok 3 12007 0 3 No Ok Adaptor 6 3 15001 0,2 3 No Ok 3 11998 0,2 3 No Ok Adaptor 6 3 14998 0 3 No Ok 3 11998 0 3 No Ok Adaptor 7 3 14998 0,1 3 No Ok 3 11999 0 3 No Ok Adaptor 7 3 14997 0,1 3 No Ok 3 12001 0 3 No Ok Adaptor 8 3 15000 0 3 No Ok 3 5 0 3 Yes Fail TrippedAdaptor 8 3 14998 0 3 No Ok 3 11997 0,2 3 No Fail TrippedAdaptor 9 3 15001 0,1 3 No Ok 3 11998 0 3 No Ok Adaptor 9 3 14998 0 3 No Ok 3 11999 0,3 3 No Ok
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Adaptor
HV C
able
Test of HV Cables
Fast Test (30 min)V0 = 15 KVI0 = 3μATrip Time = 3 sec0< I < 0.2 μA
Long Test (48 hours)V0 = 12 KVI0 = 3μATrip Time = 3 sec0< I < 0.3 μA
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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)
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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
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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 logger – Leak Box – N2H2 gas – Hydrogen Leak Detector (H2000+)
Some results:W-1 260 L/h -> 160 L/h
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ANALYSIS WORK
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h
f
Forward tagging jets
MET + jj + muonsm
m
Search of Dark Matter at the LHC in VBF processes using SUSY models.
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VFB JetsVBF 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.
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VFB JetsVBF related distributions for V + jets and VBF production of a chargino pair.
The outgoing partons in VBFprocesses must carry relatively large pT
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Missing Transverse Energy
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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
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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
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Conclusions
• Ready to work¡¡¡
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BACKUP SLIDES
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Figure 1: Diagrams of chargino-neutralino and chargino-chargino pair production through vectorboson fusion followed by their decays to leptons and a LSP.
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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.
Distribution of the four-lepton reconstructed mass for the sum of the 4e, 4μ, and 2e2μ
channels. Points represent the data, shaded histograms represent the background and un-shaded histogram the signal expectations. The
distributions are presented as stacked histograms. The measurements are presented for the sum of the data collected at centre of mass energies of
7 TeV and 8 TeV.
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Lo que conocemosToda la materia que conocemos compone el 4% de la materia total del universo (protones, neutrones, electrones, etc)
¿Dónde esta el resto?
74 % Dark Energy22 % Materia Oscura
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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
/Nico
le R
ager
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Composición de la materia
Bosones Fermiones
Quarks Leptones
Modelo Estándar
SUPERSIMETRÍA?
Supercompañero
Supercompañero Boson
Fermion
Masas Grandes
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Composición de la materia
Bosones Fermiones
Quarks Leptones
Modelo Estándar
SUPERSIMETRÍA?
Supercompañero
Supercompañero Boson
Fermion
Masas Grandes
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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.
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Objetivo
• Buscar Materia Oscura en el LHC asociada a procesos VFB utilizando modelos Supersimétricos.
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Parámetro η : La seudorapidez
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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.
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Matter composition
Bosons Fermions
Quarks Lepton
Standard Model
SUPERSYMMETRY?
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Matter composition
Bosons Fermions
Quarks Lepton
Standard Model
SUPERSYMMETRY?
S-Boson
S-Fermion
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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 Energy22 % Materia Oscura
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Supersimetría
• Theoretical problems of the SM• Candidate to Dark Matter (LSP)
SUPERSYMMETRY?
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Matter composition
Bosons Fermions
Quarks Lepton
Standard Model
SUPERSYMMETRY?
S-Boson
S-Fermion
Big Mass
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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.
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Classic Setting (Model Dependent)
Exclusion Limits for squarks and gluinos.1.5 TeV 95%
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Work already done
• Git account• Andres Florez tutorial of the code
– source setupCode_5_3_11_patch6.sh• Grid certificate• Crab??• Run the code??
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Physics Object Reconstruction: Electrons
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Muon Reconstruction and Identification
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Missing Transverse Energy
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η: Pseudorapidity
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Software Requirements
MC Generator:POWHEG, MADGRAPH, TAUOLA, Pythia,etc.Analysis software:CMSSW, Root, etc.Object Reconstruction:Criteria selection defined by CMS
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Physics Object Reconstruction: Jets
anti-kT clustering algorithm with a reconstruction cone of
R = 0.5 is used
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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
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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.
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Main Purpose
• Search of Dark Matter at the LHC in VBF processes using SUSY models.