Tuple values of BPVLTIME do not always correspond to online values
In the 2023 data, we ran with a requirement of BPVLTIME > 0.2ps
( https://gitlab.cern.ch/lhcb/Moore/-/blob/master/Hlt/Hlt2Conf/python/Hlt2Conf/lines/charm/d_to_hhh.py#L136 ). However, offline, we see a small portion (2%) of entries with a nan
value for the BPVLTIME.
This also happens when there is only 1 PV present in the event, which excludes the IP <-> IPCHI2 association as the culprit. The resolution of the reconstruction does look degraded, but it's clear this is also happening to signal.
The tuples are produced as part of the analysis production: https://lhcb-analysis-productions.web.cern.ch/productions/?wg=charm&analysis=charmprodasym and part of the Ds -> K K pi selection