Logo VBSCan COST Network

Action Deliverables

# Description Progress Informations
1 Definition of the vector boson scattering signal for the phenomenological studies and data analyses within the first two years of the action delivered arXiv:1812.09740, arXiv:1901.04060
2 Calculation of the Standard Model VBS process with NLO precision in QCD and EWK calculations. delivered The full calculation has been performed for two exemplary cases, making the tools for the calculation available to the scientific community: Phys. Rev. Lett. 118, 261801 arXiv:1803.07943 arXiv:1904.00882
3 Development of effective field theory parameterisations with NLO precision in QCD and EWK calculations. ongoing Several groups provide the possibility to include EFT in VBS processes supplemented by NLO QCD corrections. The inclusion of EW corrections in the EFT framework is at sight, but it involves significant challenges to be tackled. A timeline of one or few years seems realistic. A
4 Determination of a standard reference for effective field theory parameterisation, to be used in all VBS studies and analyses within the first two years of the Action. delivered 1709.06492 1801.04203
5 Definition of the most significant observables at hadron colliders, to isolate with maximal significance the VBS topology, and to maximise sensitivity to physics beyond the Standard Model. delivered ATLAS and CMS collaborations have published recently results for which they used significant observables, and more publications with the full Run2 dataset are expected by next year, with more discriminative variables used. The Action will summarise these results in a single collection of relevant variables, comparing their effect in phenomenological studies and in the data analysis of the two experimental Collaborations. Sets of variables to maximise sensitivity to VBS topology were found (though analyses apply also ML techniques that do not rely on a single observable). We analysed EFT operators in terms of experimental sensitivity to the cross-section modifications. In general modifications of cross-section induced by these EFT operators were found to be small, thus progress was made in selecting the most promising ones rather than kinematic variations of the processes they affect.
6 Definition of reference guidelines for the coherent combination of analysis results in different VBS studies (different experiments, different final states) within the first two years of the Action delivered After a topical workshop held on March 5,6 2019 (link), the first guidelines have been agreed among interested parties and documented in a twiki page (restricted to the VBSCan community: link), a working group defined through a mailing list (vbscan-combination@cern.ch), Git repositories for the combination activities have been setup (restricted to the VBSCan community: ancofit, d6fit). The access to the resources is granted upon request to all interested players, and will be made public after results publication.
7 Definition of guidelines, from phenomenological studies, to be used as reference in the development of data analysis procedures delivered Recent published VBS analyses( arXiv:1812.09740, arXiv:1901.04060) follow guidelines, in the results presentation, developed with the Action, which have become a standard in the VBS results presentation.
8 Study of particle reconstruction and identification algorithms dedicated to the VBS final state objects and topology. delivered Several solutions for the current LHC and HL-LHC upgrades of ATLAS and CMS have been proposed and implemented.
9 Implementation of the data analysis with the datasets collected by experiments at hadron colliders. delivered VBS was experimentally confirmed in all major final states by the experimental collaborations in most of the cases with the full luminosity collected by the LHC Run 2. The first study of the polarised VBS in the same-sign WW final state has been published and a first strong evidence on the standard-model component in the semi-leptonic final state has been made recently public.
10 Statistical combination of the results obtained by the data analyses and their interpretation in the frame of models of new physics. delivered The first combination of VBS results has been published as arXiv:2101.03180. The activity is continuing, also involving the experimental Collaborations. The active participation in the LHC EFT WG, and CMS EFT Forum foundations of the VBSCan participants, as well as in the experimental studies, sets solid foundations for the work that will be developed in the months after the end of the Action.
11 Design and deployment of the Action Website, including the databases for the outreach material and the internal documentation delivered VBSCan website
12 Organisation of the scientific kick-off event of the Action, the yearly workshops, the Mid-Term Scientific Meeting and the Final Conference delivered All planned meeting of the Action took place as planned, despite the Covid emergency.
13 Preparation, organisation and advertising of the training schools foreseen by the Action. delivered The training plan of the Action follows the evolution of the works, starting from an introductory training, and evolving with more advanced subjects. The first school targeted a wide audience and successfully trained both Action members and not, with a large fraction of female young scientists and an outstanding panel of trainers. The website of the school, containing all the training material, can be found at this link. The school took place in Maratea, Italy. The following training event addressed specifically VBSCan members, with training on the knowledge and tools developed and used within the action. The website of the event, containing all the training material, can be found at this link. The training event took place in Ljubljana, Slovenia. The next training event has been an advanced school, organised in collaboration with the ParticleFace COST Action, on subjects related to effective field theory foundations and fits, data simulation and reconstruction, precision theory calculations and to machine learning. that enabled VBSCan participants to improve knowledge and tools for physics processes theory calculation and analysis performances. The last training event was dedicated to cutting-edge topics connected to the future of VBS: its polarised component, non-linear EFT and anomaly detection with machine learning tools, together with seminars of technological interest (quantum computing, artificial intelligence in pdf fits and the Julia programming language) and application for competitive funding openings.
14 Design, development, deployment and maintenance of the careers platform, to promote Early Stage Researchers careers. delivered Job offers in the academic sector, pertaining to the matters of VBSCan, are regularly announced in the general VBSCan mailing list. Given the quick evolution of the job market, this resulted to be the most effective way to share the information with the Action participants. Useful tools for job finding have been posted to the Action web page and general job databases for HEP researchers have been linked. The creation of a static database of job offers turned out to be not functional (this is the reason why we indicate 80% instead of 100% as level of achievement), since it would simply reproduce existing resources, which have anyhow been linked to the VBSCan web page. Relevant job openings have been systematically forwarded to the general VBSCan mailing list. A career survey has been conducted instead, aiming for younger researchers to get insight into how jobs and careers develop over the course of a researcher’s life.
15 Outreach activities promotion: preparation and collection of reference outreach material, organisation of outreach events, and consequent actions to ensure regular time frequency. A yearly review of the management committee will follow the accomplishment of the deliverable delivered Outside of the pandemics outreach events have been systematically organised during Action gatherings, to allow for the local population and students to interact with the Action participants and, in the case of the Ljubljana meeting, with local success enterprises. The reports from the outreach events are published in our webpage.
16 Action Handbook: collection of the publications and materials produced by the working groups into a single coherent report delivered For the most relevant workshops, VBSCan collected the status of the activities in a report submitted and published on open journals. The final collection of all the Action papers is reported in the VBSCan web page in a form of a summary Wiki page.
17 Inclusiveness monitor: setting inclusiveness targets and constant verification of their achievement, deploying measures to ensure their success. A yearly review of the management committee will follow the accomplishment of the deliverable. delivered The progress of the inclusiveness measures are regularly monitored during the Action meetings.
18 Review of the status of the art in theory, experiments and statistics pertaining the VBS analysis, or of interest for future developments. delivered 1801.04203 arXiv:1803.07943