Use case class 2 -- User Story

Use case class 2:

A user story on data and analysis preservation:

Present Lise and Albert:

Lise is a phenomenologist, who has developed an effective theory for the description of exotic baryons, namely pentaquarks.

She would like to fit her model to the LHCb data on the Jpsi K p final state. The pentaquarks appear on top of a strong irreducible background of hyperon decays. In fact she would like to exploit interference effects between the pentaquark modes and the hyperons to extract phase information, which she could compare to her model. There are two problems: the published data by LHCb only contains projections of the kinematic distribution but not the full interference pattern. And in order to be able to achieve the desired precision additional information on the hyperon spectrum is needed. Such information has recently been published [ Eur. Phys. J. A 55, 180 (2019)]. Albert is an experimentalist who would like to combine the information on the hyperons with the LHCb data and Lise's pentaquark model. To achieve this the hyperon parameterisation would have to be painstakingly reimplemented and included in the fit to the fully differential decay rate as observed by LHCb. Such an approach, however would not allow for the LHCb data to have a say on the hyperons itself. In order to achieve this a combined fit to the LHCb data as well as the data sets analysed in the publication mentioned above would be needed.

Future Lise and Albert:

Lise publishes her breakthrough precision calculation accompanied by a digital Dynamic Research Product DRP on the PUNCH-SDP. Albert sees this and looks for RP's and DRP’s on the platform containing information on hyperons and pentaquarks. He finds DRPs from Crystal Barrel, from the group who did the combined hyperon fit and from LHCb. Albert invites Lise for a collaboration. They include Lise’s and the experimental DRP’s in a new DRP and write a new fitting code to ensure consistent treatment of all events over all experiments. In the ideal (and slightly unrealistic) case, where the experimental systematic uncertainties can still be accessed from the experimental DRP’s, the analysis can be directly run. Since the data, simulation and the analysis code from the legacy experiments is stored in a data format and programming language supported by the platform, no additional work to retroactively achieve a sufficient level of data preservation is necessary. Lise and Albert publish a successful paper and store their workflow as a DRP on the PUNCH-SDP.