SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 1 ToT saturated events: a preliminary study N.Giglietto-M. Brigida F.Giordano Science Verification,

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Presentation transcript:

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 1 ToT saturated events: a preliminary study N.Giglietto-M. Brigida F.Giordano Science Verification, Analysis and Calibrations

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 2 A study on the events saturating ToTs Question: ToT values in saturation are really high energy deposit? Answer: probably yes, but not easy to demonstrate Strategy to understand this simple situation: 1) define a clean class of event (i.e muons) 2) look to the ToT distribution and compare with the whole distribution 3) event display to verify

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 3 Muon definition We define as muon the event with the following characteristics: Single track 1 Mip deposit in calorimeter (0.6<CALMIP<1.3) Moreover we use almost vertical event (Zdir <-0.95)

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 4 What are the keys to select shower? Showers should be characterized by many hits or many tracks or bad chi^2 in the reconstruction Here shower is defined as TRACK>1 or event with CALMIP>1.3 Showers are characterized by Many hits out of track (>40-60) or bad chi^2 in the first track or many total hits (>70?)

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 5 ToTs All ToTs in all active layers Fraction of ToT saturations: 0.21 % all events 0.05 % muons 0.31 % showers

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 6 Examples: good muons Good muons have few hits outside the track

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 7 Examples: bad muon 72 total hits, 56 out of track

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 8 Shower 205 total hits/172 out of track

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 9 Conclusions-1 Muons have fewer fractions of ToT saturations Showers (defined looking only hits or CAL) have a larger fraction of ToT saturations ToT saturations indicates really large energy deposits Everything ok?

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 10 Damn! What is this tail? (not muons nor showers) Layers with ToT saturated

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 11 Events with a lot of saturations (>1) Nothing strange but 11 hits (5 out of track) and 4 arrays in saturation

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 12 Examples-2 High energy event? 31 hits 5 arrays ToT-saturated

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 13 Example-3 Clean muon but 37 hits 21 out of track and 9 arrays in saturation

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 14 A look on these events Probably too short tracks

SVACInstrument Analysis Workshop, July 21-22, 2005 N.Giglietto 15 Conclusions-2 Are these events physical? Probably yes: many short tracks or large zenith events (and bad reconstruction)