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[Rivet] Fwd: Re: Broken e-cal stripJonathan Butterworth jmb at hep.ucl.ac.ukSun Aug 7 10:37:33 BST 2011
I don't know the answer off hand, sorry. But normally an effect like this will either be corrected for on the way to making a particle level measurement, or will be clearly given in the fiducial phase space of the measurement. By "normally" here though I guess I mean in SM group measurements. Since this is a SUSY note your mileage may vary. But since you raise the "analyses on the same time frame" I thought I should mention it. Also of course CONF notes aren't in general intended for rivetting, papers are. But I guess you knew that... Cheers, Jon On 03/08/2011 13:27, David Grellscheid wrote: > Hi Riveters! > > just for information, see the emails below. Andy Pilkington tried to > help me find the absolute position of the broken e-cal strip, which is > relevant for ATLAS-CONF-2011-098 and, I presume, other analyses from the > same timeframe. > > As usual, it's top secret. :-/ > > David > > > -------- Original Message -------- > Subject: Re: Broken e-cal strip > Date: Wed, 03 Aug 2011 13:24:01 +0100 > From: David Grellscheid <david.grellscheid at durham.ac.uk> > To: Andrew Pilkington <Andrew.Pilkington at cern.ch> > > Hi Andy, > > Thanks for chasing it up! Sounds like the usual ATLAS competency muddle. > >> They are a bit worried about giving the information >> out because some of the earlier runs do not have the problem, and the >> problem is now fixed, so running those cuts will still not give you the >> right answer in terms of efficiency. > > That's fine, but as it stands, the information in CONF-2011-098 is not > reproducible. They should at least make it explicit how many of their > events are affected, and to what extent (is it 10% loss over the full > record or the affected subset of events?). The only thing I can do in > Rivet at the moment is to throw away 10% of events randomly for the full > run. > > Thanks again! > > David > > >> On 29 Jul 2011, at 15:35, David Grellscheid wrote: >> >>> Hi Andy, >>> >>> the conf note ID is ATLAS-CONF-2011-098, p.3 at the bottom: >>> >>>> >>>> Due to a front–end electronics failure in one of the electromagnetic >>>> calorimeter modules, a region of the calorimeter of size ∆η × ∆φ = >>>> 1.6 × 0.4 was only partially read out. Events with any jet with pT > >>>> 50 GeV in this region are rejected. The acceptance loss caused by >>>> this selection cut is about 10%. >>>> >>> >>> Thanks! >>> >>> David >> >> +++++++++++++++++++++++++ >> >> Andy Pilkington >> IPPP Durham and Manchester >> >> +++++++++++++++++++++++++ >> >> >> >> > _______________________________________________ > Rivet mailing list > Rivet at projects.hepforge.org > http://www.hepforge.org/lists/listinfo/rivet -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Prof. Jonathan Butterworth, http://www.hep.ucl.ac.uk/~jmb/ Physics and Astronomy Department Tel: +44 20 7679 3444 ATLAS, CERN Tel: +41 22 76 72340 University College London Gower St, London WC1E 6BT, UK ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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