Beam Energy-Loss measurement

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Presentation transcript:

Beam Energy-Loss measurement Rhys Gardener CM43 RAL 29/10/2015 1

Outline - Aiming to demonstrate that it will be possible to make the first muon beam energy loss measurement. - Quick look at the past. - Overview of MC analysis with reconstruction. - large effort to overcome reconstruction errors. CM43 RAL 2 2

Past Measurements No measurement of muon energy loss in LH2 done before Some Bubble chamber studies have used Bethe approximation to measure muon mass, not vice versa Simon Holmes thesis on MuScat touched on energy loss measurement briefly Measured end-of-beam energy vs x-axis as an attempt to measure energy-loss/scattering correlation. No conclusive results gained. CM43 RAL 3 3

Past Measurements So, MICE will be the first experiment to measure the mean energy loss of a Muon beam in Liquid Hydrogen (and LiH). CM43 RAL 4 4

MC Analysis Simulating muons with 200MeV in US tracker, 6mm beam. 500k muon events (need larger data sets because of stats loss) TOF2 triggers: 186961 Full field in DS (for now) Using MAUS v1.1.0, test geometry w. LH2 absorber (#673) Analysis is taking a momentum measurement in upstream tracker, subtracting momentum in downstream tracker to get momentum loss in absorber on particle-by-particle basis. Errors in mean energy loss dominated by Pz reconstruction resolution errors in the residuals. CM43 RAL 5 5

Pz Residuals – without cuts US DS

MC Energy loss vs Energy loss (without selection cuts)

So... Off-center residuals in US and DS trackers result in overestimating the energy loss. Mean recon. energy loss is 4.43MeV larger. Need a method of selecting region of well-reconstructed tracks with mean residual closer to 0. Create distribution of PT vs PZ for tracks that have poor PZ residuals Subtract from this the distribution of all selected events. Result is a “pattern” which shows regions where there is an excess of well reconstructed events. Can do a “by eye” selection from messing around with these plots CM43 RAL 9 9

PT vs PZ event selection in DS Poor Residuals - All events -

Excess of well-reconstructed events in DS tracker

Cuts on Pt and Pz In US tracker: Pt > 30MeV Pz < 210MeV In DS tracker: 30MeV < Pt < 40MeV 185MeV < Pz < 202MeV These cuts take away a lot of potentially useable events But do improve at least the mean residuals...

Pz residuals (after cuts)

Energy loss with cuts: Mean energy loss is now comparable to the MC mean..

Comments Attempting to find well-reconstructed events with this method is clearly not perfect. Losing ~96% of TOF2 triggers Very wasteful. At least find a defined region of events that provide OK residuals. Only really useful to show that if more events were reconstructed well, then the mean energy loss is measurable. Some flag in reconstruction which could indicate whether an event is usable would be a good solution. More usable events! Need to test this with an empty absorber Most likely will need to see some improvement in the reconstruction to carry out the measurement in this fashion. CM43 RAL 15 15