Neutrinos from BBfit J. Brunner.

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Presentation transcript:

Neutrinos from BBfit J. Brunner

Data selection (3N trigger) 01/02/07-25/05/07 25/05/07-04/12/07 Au 36.6 days 90.7 days Ag-Au 10.5 days 29.8 days Ag 47.1 days 120.5 days Adding Ag-Au data (~30%) decreases rates by 10-15% whereas MC stays the same (produced with Au reference run) Strasbourg This presentation

Data Selection Data sample comparison : Strasbourg versus now 120.5 days 2.5 M muons 11.5 M muons 36.8 days

Event rates muons Data(1) neutrinos Basic cuts(2) 1.23 Hz 1.18 Hz 4.8/day Single line 0.54 Hz 0.51 Hz Multi line 0.69 Hz 0.67 Hz 1L upward 1501/day 1835/day 2.0/day 2L upward 657/day 894/day 2.8/day Scaled with 1.2 for trigger bug (see analysis elog 125) 6 hits at least && track fit better than bright point fit

Zenith angles multi-line basic cuts Good match MC-data MC truth shape well maintained 0.67Hz 0.69Hz 657/day 894/day 2.8/day

Zenith angles single-line basic cuts Good match MC-data MC truth shape well maintained 0.51Hz 0.54Hz 1501/day 1835/day 2.0/day

Fit Quality Slight difference between data and atm. muon MC Multi line fit Slight difference between data and atm. muon MC Not yet understood Might also be related to atm. muon physics (hadronic model, composition) Better agreement for neutrinos (see below) Single line fit

Fit Quality for upward going tracks Multi line fit Single line fit Cut for multi lines: 4.3 Purity better than 95% Cut : 2.7 , ct>0.5 Purity better than 80% PP? 0.36/day 0.78/day 0.70/day 0.45/day 0.005/day 0.07/day

Angular error for zenith angle Mean values of log of zenith angle difference muons neutrinos 2.0º 2.1º 0.7º (15%) 0.7º (25%) No ghost peak at 90 degree Neutrino reconstruction not better than muon reconstruction Cut gains factor 3 in precision for 15-25% subsample

Angular error for space angle Mean values of log of space angle difference muons neutrinos 6.5º 8.9º 3.1º (15%) 4.4º (25%) No ghost peak at 90 degree Neutrino reconstruction not better than muon reconstruction Cut gains factor 2 in precision for 15-25% subsample

Neutrino count : 155 / 167 days 01/02/07-25/05/07 25/05/07-04/12/07 Au 1L : 18 2L : 16 Ag-Au 1L : 3 2L : 4 Ag 1L : 21 2L : 20 1L : 36 2L : 78 Ag-Au runs contribute marginally (to be verified for other periods) Strasbourg This presentation

Zenith angles multi-lines update 78 neutrinos 78 neutrinos PP?

Zenith angles single-line PP? 36 neutrinos 36 neutrinos

Bright neutrinos

Bright neutrinos

10 lines analysis Data Dec 2007 – Apr 2008; Ag runs : 100 active days Multi line Single line Use same cut: 4.3 Use same cuts: 2.7 costh > 0.5

10 lines analysis Data Dec 2007 – Apr 2008; Ag runs : 100 active days Multi line Single line 208 neutrino 88 neutrino PP?

Bright neutrinos