Shedding light on physics beyond the Standard Model at the LHC Run 2 using photons
PhotonPortal is an All-Knowledge Challenge project funded by the French National Research Agency (ANR) for the 2016-2020 period, and a collaboration of the ATLAS Experiment groups of LAPP Annecy-le-Vieux, LPNHE Paris and LAL Orsay.
The discovery of the Higgs boson at the LHC Run 1 represents a milestone of particle physics. On the other hand, no clear sign of new phenomena beyond the Standard Model was found in the proton-proton (pp) collisions collected at 7 and 8 TeV at the LHC. The LHC Run 2 started in 2015, and by the end of 2016 ATLAS already collected 40 fb-1 of pp collisions at 13 TeV. The increased center of mass energy with respect to Run 1 has allowed ATLAS to search for new physics directly by looking for new particles, and will permit, in the years to come, to reveal New Physics through precision studies in the Higgs boson sector.
Final states involving photons will play an crucial role!
Di-photon events will be used to search additional Higgs-boson-like particles, while topologies with non-resonant photon pairs or single photons in presence of missing transverse energy will probe more exotic scenarios. In parallel, the study of the production of the Higgs boson associated with other objects represents an excellent opportunity to discover new physics: by exploiting the di-photon decay channel it will be possible to cleanly isolate the Higgs boson signal in events with additional objects, and to explore the possibility of its resonant or non-resonant production in association with new particles. With the full Run 2 dataset, about 100 fb-1 of pp collisions at 13 TeV, the PhotonPortal project plans to complete a rich and diverse program of searches and precision measurement exploiting photons in the final state as unifying element.
The team behind the PhotonPortal project
We are a group of experimental physicists working on the ATLAS experiment in three French CNRS/INP23 laboratories. We played a fundamental role in the discovery of the Higgs boson and in the measurement of its properties and rare decays. We have a leading position in the ATLAS H→γγ and photon-related physics activities, and maintain a strong involvement in the ATLAS LAr electromagnetic calorimeter.
- Marco Delmastro (Project Coordinator and LAPP Local Responsible)
- Nicolas Berger
- Saskia Falke (PhD Student)
- Thibault Guillemin
- Oleh Kivernyk (Post-doc)
- Remi Lafaye
- Sergii Raspopov (PhD Student)
- Isabelle Wingerter
- Alexis Vallier (Post-doc)
- Giovanni Marchiori (LPNHE Local Responsible)
- Bertrand Laforge
- Sandrine Laplace
- Irena Nikolic
- Ioannis Nomidis (Post-doc, hired by PhotonPortal)
- Josè Ocariz
- Lydia Roos
- Ahmed Tarek (PhD Student)
- Louis Fayard (LAL Local Responsible)
- David Delgove (Post-doc, hired by PhotonPortal)
- Jean-Baptiste De Vivie
- Marc Escalier
- Daniel Fournier
- Antinea Guerguichon (PhD Student)
- Marumi Kado
ATLAS Conference Notes
ATLAS Collaboration, Search for resonances in the 65 to 110 GeV diphoton invariant mass range using 80 fb^-1 of pp collisions collected at sqrt(s)=13 TeV with the ATLAS detector, https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2018-025/.
ATLAS Collaboration, Measurement of Higgs boson properties in the diphoton decay channel using 80 fb-1 of pp collision data at sqrt(s) = 13 TeV with the ATLAS detector, https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2018-028/.
ATLAS Collaboration, Measurements of Higgs boson properties in the diphoton decay channel with 36.1 fb-1 pp collision data at the center-of-mass energy of 13 TeV with the ATLAS detector, https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2017-045/.
ATLAS Collaboration, Measurement of the Higgs boson mass in the H->ZZ*->4 and H->γγ channels with sqrt(s)=13TeV pp collisions using the ATLAS detector, https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2017-046/.
ATLAS Collaboration, Search for new phenomena in events with missing transverse momentum and a Higgs boson decaying into two photons at sqrt(s) = 13 TeV with the ATLAS detector, https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2017-024/.
Publications on refereed journals
ATLAS Collaboration, Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector, arXiv:1806.00425 [hep-ex].
ATLAS Collaboration, Measurement of the Higgs boson mass in the H->ZZ* ->4 l and H ->γγ channels with sqrt(s)=13 TeV pp collisions using the ATLAS detector, arXiv:1806.00242 [hep-ex].
ATLAS Collaboration, Measurements of Higgs boson properties in the diphoton decay channel with 36 fb-1 of pp collision data at sqrt(s) = 13 TeV with the ATLAS detector, arXiv:1802.04146 [hep-ex].
ATLAS Collaboration, Search for dark matter in association with a Higgs boson decaying to two photons at sqrt(s) = 13 TeV with the ATLAS detector, Phys. Rev. D 96 (2017) 112004, arXiv:1706.03948 [hep-ex].
ATLAS Collaboration, Searches for the Zγ decay mode of the Higgs boson and for new high-mass resonances in pp collisions at sqrt(s) = 13 TeV with the ATLAS detector, JHEP 1710 (2017) 112, arXiv:1708.00212 [hep-ex].
ATLAS Collaboration, Search for new phenomena in high-mass diphoton final states using 37 fb-1 of proton--proton collisions collected at sqrt(s)=13 TeV with the ATLAS detector, Phys. Lett. B775 (2017) 105--125, arXiv:1707.04147 [hep-ex].
PhotonPortal is funded to hire 3 Post-doctoral Research Associates over the project period. We also seek promising studends to pursue a PhD thesis on the project themes.
We are currently seeking candidates for:
- One post-doctoral position based at LAPP Annecy, to work on measurement of the Standard Model Higgs boson coupling properties in the diphoton decay channel. The position can begin as soon as October 1st 2018. Applications received by June 30th 2018 will receive full consideration. The call will remain open until filled.