[Rivet] Question on searches in rivet

[Lucia Masetti]

Dear Andy, all,
thank you very much for the information!

My interest is in the analyses that include a comparison with reference 
data. While the search results in general include a limit on the signal 
cross-section (or number of events for the given luminosity), which can 
be compared with the truth level analysis, I don't understand how 
histograms can be compared. For example in ATLAS_2011_S9212183 there are 
4 histograms in the paper that look to me like reconstruction level and 
they are given for comparison in the reference data. I wonder how it is 
possible to compare non-unfolded data with histograms produced in a 
Rivet analysis. Can you please help me understanding the idea behind 
this kind of procedure?

Cheers,
Lucia
> On 03/09/14 13:57, Lucia Masetti wrote:
>> Hi Andy,
>> in the ttbar resonances team we are discussing what information to put
>> on HEPData, with the aim (hope) that our limits can be recast with new
>> models whenever a theorist wants to test their new ideas.
>> At the Boost workshop you mentioned that in Rivet there are not only
>> unfolded measurements, but also searches. How is the comparison btw MC
>> and data within Rivet intended to be done in those cases? Does the code
>> provide only event selection and reconstruction routines or also some
>> tools to compute the limits? Can you maybe point me to some examples I
>> could take as example?
> Hi Lucia,
>
> Apologies for the delayed reply. I have copied this to the Rivet
> developer list where you'd have got a faster response!
>
> Rivet doesn't contain any likelihood machinery -- this could conceivably
> be added if a good enough interface proposal (i.e. sufficiently general
> without being unusable) could be designed. On BSM fitting projects that
> I'm involved with, we typically need to know the background rate and
> uncertainty for each signal region, the integrated luminosity of the
> sample, ideally some information about correlation between regions, etc.
> ... and I haven't yet seen a uniform interface for passing enough info.
>
> So I think what Rivet currently does -- i.e. just report the numbers of
> events passing cuts, or better: the signal cross-section and acceptances
> -- is probably ok for now. As our histogramming tools develop, we can do
> that in a more structured way than just print-outs into the log: there
> are now Counter objects which should be ideal for that purpose, and
> automatically writing cross-section info into the output is planned.
>
> Here is a very quickly obtained list of search implementations in Rivet
> (maybe not exhaustive, and I know that e.g. the ATOM fitting
> collaboration have implemented a bunch more for their own use):
>
> andy at duality:~$ rivet --list-analyses | grep -i search
> ATLAS_2011_CONF_2011_090    Single lepton search for supersymmetry
> ATLAS_2011_CONF_2011_098    [UNVALIDATED] B-jets search for
> supersymmetry with 0-leptons
> ATLAS_2011_S8983313         0-lepton squark and gluino search
> ATLAS_2011_S9019561         Two lepton supersymmetry search
> ATLAS_2011_S9041966         [UNVALIDATED] 1-lepton and 2-lepton search
> for first or second generation leptoquarks
> ATLAS_2011_S9108483         [UNVALIDATED] Long-lived heavy charged
> particle search
> ATLAS_2011_S9212183         0-lepton squark and gluino search
> ATLAS_2011_S9212353         [UNVALIDATED] Single lepton search for
> supersymmetry
> ATLAS_2011_S9225137         High jet multiplicity squark and gluino search
> ATLAS_2012_CONF_2012_001    [PRELIMINARY] 4 or more lepton plus missing
> transverse energy SUSY search
> ATLAS_2012_CONF_2012_103    [UNVALIDATED] High jet multiplicity squark
> and gluino search
> ATLAS_2012_CONF_2012_104    [UNVALIDATED] Search for supersymmetry at 8
> TeV in final states with jets, missing transverse momentum and one
> lepton with the ATLAS detector.
> ATLAS_2012_CONF_2012_105    [UNVALIDATED] Search for supersymmetry with
> 2 same-sign leptons, jets and missing transverse energy
> ATLAS_2012_CONF_2012_109    [UNVALIDATED] 0-lepton squark and gluino search
> ATLAS_2012_CONF_2012_153    [PRELIMINARY] 4 or more lepton plus missing
> transverse energy SUSY search
> ATLAS_2012_I1095236         [UNVALIDATED] b-jets search for
> supersymmetry with 0- and 1-leptons
> ATLAS_2012_I1112263         3 lepton plus missing transverse energy SUSY
> search
> ATLAS_2012_I1117704         High jet multiplicity squark and gluino search
> ATLAS_2012_I1125961         0-lepton squark and gluino search
> ATLAS_2012_I1126136         [UNVALIDATED] SUSY Top partner search in
> jets with missing transverse momentum
> ATLAS_2012_I1180197         [UNVALIDATED] Search for supersymmetry at 7
> TeV in final states with jets, missing transverse momentum and isolated
> leptons with the ATLAS detector.
> ATLAS_2012_I1186556         [UNVALIDATED] Search for a heavy top-quark
> partner in final states with two leptons.
> ATLAS_2012_I1190891         [UNVALIDATED] 4 or more lepton plus missing
> transverse energy SUSY search
> ATLAS_2012_I1204447         Inclusive multi-lepton search
> ATLAS_2012_I943401          Search for supersymmetry with 2 leptons and
> missing transverse energy
> ATLAS_2012_I946427          [UNVALIDATED] Search for supersymmetry with
> diphotons and mising Transverse Momentum
> ATLAS_2014_I1307756         Search for scalar diphoton resonances in
> ATLAS at sqrt(()s) = 8 TeV
> CMS_2011_S8968497           Measurement of dijet angular distributions
> and search for quark compositeness in pp collisions at sqrt(s) = 7 TeV
>
>
> Cheers,
> Andy
>