Update on Rock Interaction Events by Palash Kumer Roy

This update discusses the selective retention of GENIE events likely to produce particles reaching the hall, interactions with rockboxes, muon birth rates in TMS, and muon momenta from upstream and downstream rocks. Discrepancies in muon rates are noted, prompting further investigation.

• Rock Interaction
• Muon Birth Rate
• GENIE Events
• Particle Interactions
• Muon Momentum

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1. Update on rock interaction events. Palash Kumer Roy Advisor: Dr.Mathew Muether July 20,2022 1

2. Rock Interaction Events Selectively keeps GENIE events which are determined to have produced particles likely to reach the hall (defined by a a variable RockBox ). I geneated rock interaction events with POT 1e16 rockbox:(xmin,ymin,zmin)(xmax,ymax,zmax),rockonly,wallmin,dedx,fu dge,efromw 2

3. Interaction vertex with rockbox lots of events apparent close to the hall. Downstream Rock Upstream Rock 3

4. Interaction vertex with rockbox lots of events apparent close to the hall. downstream Rock upstream Rock 4

5. TMSBirth of Muon in TMS (1e16 POT) From upstream rock with TMSBirth in first scintillator layer and forward global death From upstream rock with TMSBirth in first scintillator layer Muon rate = 5.13e(-12) per POT Muon rate = 1.4551e(-12) per POT We don t understand why Entires are so different 5

6. Foward Muon momentum for TMS particles From upstream rock with muon momentum in first scintillator layer and forward global death From upstream rock with muon momentum in first scintillator layer 6

7. TMSBirth of backward Muon in TMS From downstream rock with TMSBirth in first scintillator layer and backward global death From downstream rock with TMSBirth in first scintillator layer Muon rate = 1.3502e(-12) per POT Muon rate = 7e(-12) per POT 7

8. Backward Muon momentum for TMS particles From downstream rock with muon momentum in first scintillator layer and backward global death From downstream rock with muon momentum in first scintillator layer 8

9. 2D GlobalDeath Position downstream rock with muon momentum in first scintillator layer 9

10. Next Steps How to do overlays ? thanks 10

11. Rock Interaction Events Rock events is a term used for neutrino interactions outside the detector hall. It is generally in the rock or soil between the end of the beamline and the surrounding material to the sides and downstream. 11

12. Rock Events In the first case the event is near enough to the hall that all the particle make it and are recorded as they enter -- so the the corresponding "rock_propagated" event has 3 particles as they enter. In the second case, only the muon has enough energy to punch through the rock to the hall surface, so while the "genie_rock" event has 3 particles, the "rock_propagated" event only records the one. In the third case none are sufficient to make it to the hall and there is no corresponding 12 "rock_propagated" event.

13. F flag rockbox:(xmin,ymin,zmin)(xmax,ymax,zmax),rockonly,wallmin,dedx,fudge,efromw (xmin,ymin,zmin)(xmax,ymax,zmax) define the extent of the (inner) reference box in master world coordinates (always) rockonly 1 = generate only outside the reference box [default] 0 = also generate events within the reference box (i.e. the detector) by only excluding minuscule bubble wallmin minimum size (geometry natural units) beyond reference box size [default=800] dedx estimated dE/dx losses, used to convert energy into box size extension [default=2.5*1.7e-3] fudge extra fudge factor for box size [default=1.05] efromw expand from wall (or outer box) rather than wall just setting a minimum size [default=0 or off] 13

14. Muon in TMS downstream muon downstream muon 14