LDM Sub-group Status & Timeline For DUNE BSM Working Group - - PowerPoint PPT Presentation

LDM Sub-group Status & Timeline

For DUNE BSM Working Group

• Dec. 20, 2016

Jae Yu

Most the slides from G. Brown & A. Chatterjee

Light DM Production at High Intensity Accelerator

• Now the Higgs particle, a part of only 5% of the universe, may’ve been seen
• It is time for us to follow the suite of others in the 95% of the universe!!
• Detection of DM:
• How does a DM event look in an experiment?:

High Intensity Proton Beam Higher EP @ LBNE (F) Lower EP @ MiniBooNE

• Dec. 20, 2016

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Dark Matter Search Motivation

• Dec. 20, 2016

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DUNE potential LHC

DM Subgroup Tasks

• Integration and validation of the existing MC tools to

DUNE simulation

• Study on sensitivity limitation w/ default configuration
• Define detector parameters and the impact to sensitivity

– Angular coverage, efficiency, material depth, etc.. – ProtoDUNE measurements?

• Necessary timing and energy resolutions vs DM mass

and the effect to the neutrino background

• Produce physics results using the simulation
• Further tilted beam study
• Dec. 20, 2016

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The LDM Processing Chain

DM Flux DM-n Cross-section ND Simulations (Interfacing with LArsoft) n Background Events Event Selection Analysis

• Dec. 20, 2016

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• A. Chatterjee

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Dark Matter Flux

• DM flux generated using MadGraph.
• DM flux calculated at the detector location

using figucial cuts.

• DM four momenta are stored in four-vector

format and saved in the output root file

• Interfacing the outpt root file with ND

simulation in LArsoft.

• Dec. 20, 2016

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DM-nucleon Cross-section

• GENIE does not have any cross-section

model for DM with nucleon

• Standalone code for the cross-section
• DM-electron, DM-nucleon cross-section as a

function of DM energy and angle will be stored in root file

• Interfacing the root output file with LArsoft.
• Coding in progress.
• Dec. 20, 2016

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ND simulation

• Three alternative designs of ND available
• FGT, high pressure gAr TPC, LArTPC
• The full Geant4 simulation of FGT,

dunefgt, available

• Need to we interface the flux & X-sec
• Uses ART framework for data handling.
• Other detector option can also be tested

later

• Dec. 20, 2016

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Detailed Overview of 1st Step

• Python automates MadGraph over a range of 4 free parameters

– Dark mediator(V) mass – Dark matter particle(χ) mass – Kinetic mixing (κ), – Coupling parameter (α)

• MadGraph integrates the paths of many instances of the process

given a 120GeV proton beam striking a target and the statistics are saved to disk. – Energy, Momentum, Tilt, Etc.

• Python runs our analysis program powered by ROOT which

simulates detector response and generates graphs.

Tasks and Status

Python generates a range of parameters for MadGraph to use in its simulation.

MadGraph simulates 120 GeV proton collisions on target. Dark Matter events are saved to disk.

Our executable reads the event data. The MadGraph jobs are distributed among a supercomputing cluster. Detector response is simulated and analyzed. Event data is analyzed and graphs are generated.

• G. Brown

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Neutrino background

• Main background for LDM search is the

neutrino

• We are using G4LBNE framework to

calculate neutrino events at the ND location

• We have also calculated neutrino flux at

different off-axis angle

• Dec. 20, 2016

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• A. Chatterjee

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DM and Neutrino energy spectrum for different off axis angle

DM Spectrum Neutrino Spectrum

• Dec. 20, 2016

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• A. Chatterjee

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Status and Timeline

• Present: DM flux generation ready for interfacing to

the next step

• Feb. 2017
• Standalone code for cross-section analysis ready
• Neutrino background analysis ready
• Apr. 2017: Complete interfacing all with FGT
• June 2017: Complete the interface all and cross-

check

• July 2017: Start producing more realistic sensitivity

plots

• Dec. 20, 2016

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DM Subgroup Time Lines

• End of 2016: Produce initial estimate of signal vs background in

the normal beam configurations

– Produce initial list of detector capabilities for normal running modes – e kick out and nucleon recoil identification capabilities – Background estimate depending on the ID capabilities

• Jan. 1, 2017: Complete integration of the existing MC tool to

DUNE simulation package

• July 1, 2017: Start producing more realistic physics potential and

sensitivity plots

– Refine detector requirements, if anything need to change

• Jan. 1, 2018: Finalize the sensitivity plots vs LDM mass

– Refine sensitivity plots as needed through July 1, 2018

• July 1, 2018: Start the draft writing for TDR section
• Dec. 20, 2016

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