Message-Id: <200103030614.PAA29404@neutrino.kek.jp> Subject: Re: Minutes of SciFi weekly meeting (01/Feb/28) Date: Sat, 03 Mar 2001 15:14:35 +0900 From: Makoto Sakuda <sakuda@neutrino.kek.jp> > To: Makoto Sakuda <sakuda@neutrino.kek.jp> > cc: e362scifi, lbkek > Subject: Re: Minutes of SciFi weekly meeting (01/Feb/28) > In-reply-to: Your message of "Fri, 02 Mar 2001 11:09:40 JST." > <200103020209.LAA07604@neutrino.kek.jp> > Date: Fri, 02 Mar 2001 13:55:20 +0900 > From: Takuya Hasegawa <hasegawa@neutrino.kek.jp> > > > Hi Iwashita-kun > > Following explanation in SCIFI minutes is different from yours. > You said, > > long tail is caused by assignment of > completely differennt SCIFI track to MRD track. > > Could you clarify which is true? > > Best regards, > T.Hasegawa > > >3. MRD selection > >Iwashita looked at the matching distance between the MRD hit > >and scifi track for the first layer events. After using the > >distance scaled by the multiple scattering effect, he > >estimates 2% of them to be outside the 3sigma region. They > >are background according to the scanning result. > > > >This code will be taken in our selection. His selection > >will add 10% or more events to the First category. Dear Dr.Hasegawa, I assume that you asked me the question to SciFi minutes. Definition of the signal = A muon track in SciFi which hits MRD first layer. Definition of background is= .not.signal. He finds that outside the signal region, there are events where one SciFi track stops in LG and the other track hits MRD first layer, and the first track mistakenly picks the MRD hits of the second. This is a background in our definition. We will set the cut at 3sigma or so just as we do for other MRD events. Maybe, you mistook "background" for noise or something else. There are no two definitions of background. I hope that this will clarify your question. Regards, M.Sakuda
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