Implementation of binned observables in the Likelihood

[DegCo]

Hi all,

I have probably a simple question, but I have not found the answer in the previous issues. Hopefully it will be useful for other "rookies" like me.

When I try to implement in the likelihood binned observables just by their name, e.g. '(B0->K*mumu)', I get the error 'no measurements found'. Of course, I understand that one should also implement the binning, i.e. q2min and q2max, but I have not found a way of doing so. How do I pass in q2min and q2max information into the likelihood?

Thank you very much for your time and great work!

Example of code (that raises the error):
FL = FastLikelihood(name='test', observables= [ '<FL>(B0->K*mumu)'], include_measurements=['LHCb B->K*mumu 2020 P 4-6'])

[peterstangl]

Observables that require additional arguments can be specified in three equivalent ways:

• using a tuple like e.g. ('<FL>(B0->K*mumu)', 4, 6)
• using a list like e.g. ['<FL>(B0->K*mumu)', 4, 6]
• using a dictionary like e.g. {'name: '<FL>(B0->K*mumu)', 'q2min': 4, 'q2max': 6}

[Killngai]

Dear authors,
I also encountered the same problem as above. When I implement in the likelihood binned observables like

my_fastlikelihood = FastLikelihood( name = 'my_first_test', fit_parameters = ['C9_bsmumu'], observables = [ ('BR(Bs->mumu)'), ('BR(B0->mumu)'), ('<dBR/dq2>(B+->Kmumu)', 1.1, 6.0), ], ),

it worked successfully. But When I implement another binned obs again like
my_fastlikelihood = FastLikelihood( name = 'my_first_test', fit_parameters = ['C9_bsmumu'], observables = [ ('BR(Bs->mumu)'), ('BR(B0->mumu)'), ('<dBR/dq2>(B+->Kmumu)', 1.1, 6.0), ('<dBR/dq2>(B+->Kmumu)', 0.045, 6.0), ], )
or even ('<dBR/dq2>(B+->Kee)', 1.1, 6.0),, it throw out an error 'no measurements found'. So is there something I don't quite understand here? Thank you for telling me.

[DavidMStraub]

Well, just what is says. It doesn't find a measurement.

See here for known measurements: https://github.com/flav-io/flavio/blob/master/flavio/data/measurements.yml

[Killngai]

Thanks! It helps me a lot. So if I want to add some new observable to observables argument, I must add its measurement info as well. Would you mind giving me some examples so I can learn how to add new measurements further? Even ones that didn’t exist (measurements.yml) originally.

[Killngai]

So sorry, it's me that missed this part of the information in [add news measurements] (https://flav-io.github.io/docs/fits.html).

[DegCo]

Thank you very much! I'll make good use of it.