ProtoDUNE-SP Beamline Reconstruction: Time of Flight and Cherenkov - PowerPoint PPT Presentation

ProtoDUNE-SP Beamline Reconstruction: Time of Flight and Cherenkov Detectors Justin Hugon Louisiana State University ProtoDUNE Sim/Reco Meeting 2018-11-07

Introduction ● I’d like to look at beam pions—need to understand beamline detectors ● Look at time of fmight (TOF) and Cherenkov detector data from Jake’s reconstruction ● Use np04_full-reconstructed_v07_08_00_03_physics dataset of my own reco using v07_08_00_03 and protoDUNE_SP_keepup_decoder_reco.fcl ● Using: ● Run 5145 at 7 GeV/c ● Run 5387 at 1 GeV/c ● Run 5430 at 2 GeV/c Justin Hugon Justin Hugon 2 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Time of Flight Zoomed version of left plot Low-mass particles take 155 ns--doesn’t mesh with d=14 m (47 ns); Assume dc = 155 ns for now Justin Hugon Justin Hugon 3 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Time of Flight versus Momentum ● Plotting TOF versus momentum leads to bands based on mass ● I put lines of what it should Deuteron c √ 2 c 2 be assuming d/c = 155 ns Δ t = d m p 2 + 1 ● There seems to be a band Proton K + between the proton and K+ for 1 and 2 GeV/c π + ● Probably protons μ + ● Some bias in momentum e + reco? ● 7 GeV/c one blob Justin Hugon Justin Hugon 4 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Beamline Mass Squared 2 ( Δ t 2 c 2 2 c 2 = p − 1 ) m d 2 ● Now plotting the mass squared from the beamline detectors ● Random fmuctuations in π + /μ + /e + K + Proton TOF (and maybe Momentum) can make this negative ● Second peak clearly doesn’t line up with kaon or proton mass ● 7 GeV/c smeared across this range Justin Hugon Justin Hugon 5 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Beamline Mass 2 ( Δ t 2 c 2 2 c 2 = p − 1 ) m d 2 ● Low masses are sculpted by the square root and imprecision in d/c ● Second peak clearly π + /μ + /e + doesn’t line up with kaon K + Deuteron Proton or proton mass ● 7 GeV/c smeared across this range Justin Hugon Justin Hugon 6 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Scaling Momentum Deuteron μ + π + K + Proton Deuteron Proton π + μ + e + I tried scaling the momentum to line up with the lines It seems that the momentum should be 40% larger! Magnetic fjeld or fjber tracker alignment issue? Something else? Justin Hugon Justin Hugon 7 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Threshold Cherenkov Detectors ● Particles only give ofg light if their velocity is over a threshold (set by the gas pressure) ● My guess is that the thresholds are set so we see light with the following particles in each Cherenkov detector: No Light Light in Light in Cherenkov 0 Cherenkov 1 1 GeV/c μ +/- π +/- e +/- protons 2 GeV/c μ +/- π +/- e +/- protons 7 GeV/c protons K +/- e +/- μ +/- π +/- Justin Hugon Justin Hugon 8 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Charenkov Status 0 means no light, 1 means light No Cherenkovs were on for run 5387 Justin Hugon Justin Hugon 9 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Conclusions & Next Steps ● Time of fmight seems to be able to separate electrons/muons/pions from protons at 1 and 2 GeV/c ● Time of fmight versus momentum doesn’t line up with the expectation ● Scaling momentum by 1.4 makes things line up ● Is there a magnetic fjeld or tracker position issue? ● Next, want to look at Pandora track/shower ID for difgerent Cherenkov categories ● Plan to make an art fjlter using the TOF and Cherenkov Justin Hugon Justin Hugon 10 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Backup Slides Justin Hugon Justin Hugon 11 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Time of Flight around 155 and Momentum Low-mass particles take 155 ns--doesn’t mesh with d=14 m (dc = 47 ns); Justin Hugon Justin Hugon 12 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Beamline Mass Squared ● Due to smearing of the TOF , you get TOF < 0 ● In toy studies for LArIAT, I found it’s good to have μ + π + e + the e/pi/mu distribution ~centered on zero ● You also want to cut on mass squared to not lose the e/pi/mu with negative values Justin Hugon Justin Hugon 13 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University

Scaling Momentum by 1.4 If we really need to scale up the momentum by 1.4, then 1→1.4, 2→2.8, 7→9.8 GeV/c Justin Hugon Justin Hugon 14 ProtoDUNE-SP Beamline Reco: TOF & Cherenkov Louisiana State University Louisiana State University