[Rivet] Question on searches in rivet

[Andy Buckley]

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

-- 
Dr Andy Buckley, Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow / PH Dept, CERN