[Rivet] Fwd: Re: Broken e-cal strip

Jonathan Butterworth jmb at hep.ucl.ac.uk
Sun 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
>>
>> +++++++++++++++++++++++++
>>
>>
>>
>>
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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