bfys-physics April 2018

bfys-physics@nikhef.nl

4 participants
3 discussions

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[Bfys-physics] Zuoz summer school
by Patrick Koppenburg 16 Apr '18

16 Apr '18

Dear all, FYI: The Paul Scherrer Institute SPSI is organising a summer school on Flavour Anomalies in Zuoz (pronounced [tsuə̯ts]) in the Swiss Alps. https://www.psi.ch/particle-zuoz-school/ltp-zuoz-summer-school Cheers, Patrick -- ======================================================================== Patrick Koppenburg Nikhef, Amsterdam https://www.nikhef.nl/~pkoppenb/#contact

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Re: [Bfys-physics] [Bfys-group] AALLSAMEBPV problem
by Carlos Vázquez Sierra 10 Apr '18

10 Apr '18

Hi Niels, indeed the explanation is exactly as Laurent says. The effect of the bug in the n-body topological trigger lines is basically dropping prompt events with more than one PV (IPCHI2<16), which becomes worse as a function of n. If we wouldn't have the OR in the topo lines, the effect would be indeed catastrophic, but also probably detected already during 2015. For 2018 data-taking, the functor will be removed from the trigger lines. We'd probably do the same for the Stripping if the users agree. Cheers On 10/04/18 17:21, Laurent Dufour wrote: > Hi Niels, > > Indeed. 10% of the events are not saved. > > The effect would be much worse if the IP-OR was not there. For a calibration line for example, I do not have this OR in there. My difference is approximately 250% (I’m sensitive to combinatorics), for example. > > Cheers, > Laurent > >> On 10 Apr 2018, at 17:10, Niels Tuning <h71(a)nikhef.nl> wrote: >> >> >> >> Hi Carlos, >> >> Thanks for the info!! What a nightmare... >> >> I don't understand one thing from Olli's slides: he says that about 10% of the 3-body topo events are affected? What does he mean? >> That 10% of the events are not selected in the trigger? >> >> But you told me that the OR with a displacement requirement probably saves many events? >> (AALLSAMEBPV(-1, -1, -1) | (AMINCHILD(MIPCHI2DV(PRIMARY)) > 16) >> >> How can I reconcile these two statements? >> >> Cheers & thanks! Niels >> >> >> >> On Tue, 10 Apr 2018, Carlos Vázquez Sierra wrote: >> >>> Hi all, >>> >>> as you probably know there is a bug in one of the LoKi functors (only affecting Run-2 data & MC), namely AALLSAMEBPV. >>> Olli has presented today the topic at the Tuesday meeting: >>> >>> https://indico.cern.ch/event/715191/contributions/2960112/attachments/16301… >>> >>> In case you have worked in a Run-2 analysis, please check if you have used this functor explicitly in your selection. If yes, your results might be affected. >>> >>> Cheers >>> >>> -- >>> Carlos Vázquez Sierra >>> LHCb Collaboration >>> NIKHEF - National Institute for Subatomic Physics >>> https://phonebook.cern.ch/phonebook/#id=PE704221 + carlos.vazquez(a)cern.ch >>> >>> _______________________________________________ >>> Bfys-group mailing list >>> Bfys-group(a)nikhef.nl >>> https://mailman.nikhef.nl/mailman/listinfo/bfys-group >>> >> _______________________________________________ >> Bfys-group mailing list >> Bfys-group(a)nikhef.nl >> https://mailman.nikhef.nl/mailman/listinfo/bfys-group -- Carlos Vázquez Sierra LHCb Collaboration NIKHEF - National Institute for Subatomic Physics https://phonebook.cern.ch/phonebook/#id=PE704221 + carlos.vazquez(a)cern.ch

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bfys-physics April 2018