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Identification

Personal identification

Full name
Jan Hajer

Citation names

  • Hajer, Jan

Author identifiers

Ciência ID
621C-340E-5D7A
ORCID iD
0000-0001-8083-9102

Email addresses

  • jan@hajer.com (Professional)
  • jan.hajer@tecnico.ulisboa.pt (Professional)

Addresses

  • Avenida Rovisco Pais 1, 1049-001, Lisboa, Lisboa, Portugal (Professional)

Websites

Knowledge fields

  • Exact Sciences - Physical Sciences - Particles and Fields Physics

Languages

Language Speaking Reading Writing Listening Peer-review
German (Mother tongue)
English Proficiency (C2) Proficiency (C2) Proficiency (C2) Proficiency (C2) Proficiency (C2)
Education
Degree Classification
2010/01/16 - 2013/06/10
Concluded
 Theoretical Physics (Postgraduate Certificate)
Universität Hamburg, Germany
"Long-lived neutralinos as probes of gravitino Dark Matter" (THESIS/DISSERTATION)
2003/10/01 - 2010/01/10
Concluded
 Physics (Diplôme d´études supérieures)
Universität Hamburg, Germany
"Gravitino and scalar tau-lepton decays in supersymmetric models with broken R-parity" (THESIS/DISSERTATION)
Affiliation

Science

Category
Host institution 		Employer
2021/11/01 - Current Researcher (Research) Universidade de Lisboa Instituto Superior Técnico, Portugal
2021/01/01 - 2021/10/31 Postdoc (Research) Universität Basel Departement Physik, Switzerland
2018/10/01 - 2021/01/14 Postdoc (Research) Université catholique de Louvain, Belgium
2017/10/01 - 2018/09/30 Postdoc (Research) Université catholique de Louvain, Belgium
Université catholique de Louvain, Belgium
(...)
2013/10/01 - 2017/09/30 Postdoc (Research) Hong Kong University of Science and Technology, Hong Kong SAR China
Hong Kong University of Science and Technology, Hong Kong SAR China
2013/06/11 - 2013/09/30 Postdoc (Research) Deutsches Elektronen-Synchrotron, Germany
Deutsches Elektronen-Synchrotron, Germany
2010/01/16 - 2013/06/10 Research Trainee (Research) Deutsches Elektronen-Synchrotron, Germany
Deutsches Elektronen-Synchrotron, Germany
2009/01/16 - 2010/01/15 Research Trainee (Research) Deutsches Elektronen-Synchrotron, Germany
Deutsches Elektronen-Synchrotron, Germany

Teaching in Higher Education

Category
Host institution 		Employer
2024 - Current Invited Assistant Professor (University Teacher) Universidade de Lisboa Instituto Superior Técnico, Portugal
Projects

Grant

Designation Funders
2021/06/01 - Current Effective field theories for portal interactions of messengers to hidden sectors beyond the standard model of particle physics
2020.03969.CEECIND
Principal investigator
Fundação para a Ciência e a Tecnologia
2019/01/15 - 2021/01/14 Searches for portals to Hidden Sectors at NA62
Principal investigator
Université catholique de Louvain, Belgium
Concluded

Contract

Designation Funders
2022/12/01 - 2024/11/30 Neutrino Phenomenology: from Oscillations to Gravitational Waves
CERN/FIS-PAR/0019/2021
Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento, Portugal

Universidade de Lisboa Centro de Física Teórica de Partículas, Portugal
Fundação para a Ciência e a Tecnologia
Ongoing
2022/05/16 - 2024/05/15 Fisica de Particulas na Era do LHC e para Alem
CERN/FIS-PAR/0002/2021
Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento, Portugal
 Fundação para a Ciência e a Tecnologia
Ongoing
Outputs

Publications

Conference paper
  1. Antel, C.; Battaglieri, M.; Beacham, J.; Boehm, C.; Buchmüller, O.; Calore, F.; Carenza, P.; et al. "Feebly Interacting Particles: FIPs 2022 workshop report". 2023.
    10.1140/epjc/s10052-023-12168-5
  2. Hajer, Jan. "Searches for right-handed neutrinos at accelerators". 2019.
    10.22323/1.364.0580
  3. Hajer, J.. "A Heavy Metal Path to New Physics". 2019.
    10.22323/1.352.0090
  4. Hajer, Jan. "NA62 sensitivity to heavy neutral leptons in the low scale seesaw model". 2019.
    10.22323/1.352.0091
  5. Hajer, Jan. "Heavy Neutrinos with NA62". 2018.
    10.5281/ZENODO.2642343
  6. Drewes, Marco; Hajer, Jan; Klaric, Juraj; Lanfranchi, Gaia. "Perspectives to find heavy neutrinos with NA62". 2018.
Journal article
  1. Abdallah, Waleed; de Freitas, Tiago CarlosAdorno; Afanaciev, Konstantin; Ahmad, Shakeel; Ahmed, Ijaz; Ai, Xiaocong; Aleem, Abid; et al. "CEPC Technical Design Report: Accelerator". Radiat.Detect.Technol.Methods 8 1 (2024): 1-1105. http://inspirehep.net/record/2740505.
    10.1007/s41605-024-00463-y
  2. Stefan Antusch; Jan Hajer; Bruno M. S. Oliveira. "Discovering heavy neutrino-antineutrino oscillations at the Z-pole". Journal of High Energy Physics (2024): https://doi.org/10.1007/JHEP11(2024)102.
    10.1007/JHEP11(2024)102
  3. Antusch, Stefan; Jan Hajer; Johannes Rosskopp. "Decoherence effects on lepton number violation from heavy neutrino-antineutrino oscillations". JHEP 11 (2023): 235-235. http://inspirehep.net/record/2676341.
    10.1007/JHEP11(2023)235
  4. Antusch, Stefan; Jan Hajer; Oliveira, Bruno M.S.. "Heavy neutrino-antineutrino oscillations at the FCC-ee". JHEP 10 (2023): 129-129. http://inspirehep.net/record/2687846.
    10.1007/JHEP10(2023)129
  5. Antusch, Stefan; Jan Hajer; Rosskopp, Johannes. "Beyond lepton number violation at the HL-LHC: resolving heavy neutrino-antineutrino oscillations". JHEP 09 (2023): 170-170. http://inspirehep.net/record/2606505.
    10.1007/JHEP09(2023)170
  6. David d'Enterria; Drewes, Marco; Andrea Giammanco; Jan Hajer; Bratkovskaya, Elena; Roderik Bruce; Nazar Burmasov; et al. "Opportunities for new physics searches with heavy ions at colliders". J.Phys.G 50 5 (2023): 050501-050501. http://inspirehep.net/record/2050432.
    10.1088/1361-6471/acc197
  7. Antusch, Stefan; Jan Hajer; Rosskopp, Johannes. "Simulating lepton number violation induced by heavy neutrino-antineutrino oscillations at colliders". JHEP 03 (2023): 110-110. http://inspirehep.net/record/2167345.
    10.1007/JHEP03(2023)110
  8. El Faham, Hesham; Giammanco, Andrea; Jan Hajer. "Exploiting exotic LHC datasets for long-lived new particle searches". JHEP 12 (2022): 123-123. http://inspirehep.net/record/2176719.
    10.1007/JHEP12(2022)123
  9. Borsato, M.; Cid Vidal, X.; Tsai, Y.; Vázquez Sierra, C.; Zurita, J.; Alonso-Álvarez, G.; Boyarsky, A.; et al. "Unleashing the full power of LHCb to probe Stealth New Physics". Rept.Prog.Phys. (2022): http://inspirehep.net/record/1865621.
    10.1088/1361-6633/ac4649
  10. Ai, Wen-Yuan; Drewes, Marco; Drazen Glavan; Hajer, Jan. "Oscillating scalar dissipating in a medium". JHEP 11 (2021): 160-160. http://inspirehep.net/record/1897443.
    10.1007/JHEP11(2021)160
  11. Chiara Arina; Jan Hajer; Philipp Klose. "Portal Effective Theories. A framework for the model independent description of light hidden sector interactions". Journal of High Energy Physics 2021 9 (2021): https://doi.org/10.1007/JHEP09(2021)063.
    10.1007/JHEP09(2021)063
  12. Chrzaszcz, Marcin; Drewes, Marco; Hajer, Jan. "HECATE: A long-lived particle detector concept for the FCC-ee or CEPC". Eur.Phys.J.C 81 6 (2021): 546-546. http://inspirehep.net/record/1827822.
    10.1140/epjc/s10052-021-09253-y
  13. Juliette Alimena; Beacham, James; Borsato, Martino; Cheng, Yangyang; Cid Vidal, Xabier; Cottin, Giovanna; De Roeck, Albert; et al. "Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider". J.Phys.G 47 9 (2020): 090501-090501. http://inspirehep.net/record/1724682.
    10.1088/1361-6471/ab4574
  14. J. Hajer; W. Mantei; M. Kessel; C. Brüne; S. Wenner; A. T. J. van Helvoort; H. Buhmann; L. W. Molenkamp. "Selective area grown ZnTe nanowires as the basis for quasi-one-dimensional CdTe-HgTe multishell heterostructures". Physical Review Materials (2020): https://doi.org/10.1103/PhysRevMaterials.4.066001.
    10.1103/PhysRevMaterials.4.066001
  15. Bruce, Roderik; David d'Enterria; de Roeck, Albert; Marco Drewes; Glennys Farrar; Andrea Giammanco; Gould, Oliver; et al. "New physics searches with heavy-ion collisions at the CERN Large Hadron Collider". J.Phys.G 47 6 (2020): 060501-060501. http://inspirehep.net/record/1709994.
    10.1088/1361-6471/ab7ff7
  16. Hajer, Jan; Li, Ying-Ying; Liu, Tao; Wang, He. "Novelty Detection Meets Collider Physics". Phys.Rev.D 101 7 (2020): 076015-076015. http://inspirehep.net/record/1683929.
    10.1103/PhysRevD.101.076015
  17. Drewes, Marco; Giammanco, Andrea; Hajer, Jan; Lucente, Michele. "New long-lived particle searches in heavy-ion collisions at the LHC". Phys.Rev.D 101 5 (2020): 055002-055002. http://inspirehep.net/record/1736737.
    10.1103/PhysRevD.101.055002
  18. Marco Drewes; Jan Hajer. "Heavy Neutrinos in displaced vertex searches at the LHC and HL-LHC". JHEP 02 (2020): 070-070. http://inspirehep.net/record/1724941.
    10.1007/JHEP02(2020)070
  19. Drewes, Marco; Giammanco, Andrea; Hajer, Jan; Lucente, Michele; Mattelaer, Olivier. "Searching for New Long Lived Particles in Heavy Ion Collisions at the LHC". Phys.Rev.Lett. 124 (2020): 081801-081801. http://inspirehep.net/record/1699543.
    10.1103/PhysRevLett.124.081801
  20. Drewes, Marco; Jan Hajer; Klaric, Juraj; Lanfranchi, Gaia. "NA62 sensitivity to heavy neutral leptons in the low scale seesaw model". JHEP 07 (2018): 105-105. http://inspirehep.net/record/1647953.
    10.1007/JHEP07(2018)105
  21. Chen, Chuan-Ren; Hajer, Jan; Liu, Tao; Low, Ian; Zhang, Hao. "Testing naturalness at 100 TeV". JHEP 09 (2017): 129-129. http://inspirehep.net/record/1600815.
    10.1007/JHEP09(2017)129
  22. Nathaniel Craig; Hajer, Jan; Li, Ying-Ying; Liu, Tao; Zhang, Hao. "Heavy Higgs bosons at low $\tan \beta$: from the LHC to 100 TeV". JHEP 01 (2017): 018-018. http://inspirehep.net/record/1466130.
    10.1007/JHEP01(2017)018
  23. Hajer, Jan; Li, Ying-Ying; Liu, Tao; Shiu, John F. H.. "Heavy Higgs Bosons at 14 TeV and 100 TeV". JHEP 11 (2015): 124-124. http://inspirehep.net/record/1365110.
    10.1007/JHEP11(2015)124
  24. Hajer, Jan; Ismail, Ahmed; Kling, Felix; Li, Ying-Ying; Liu, Tao; Su, Shufang. "Searches for non-SM heavy Higgses at a 100 TeV pp collider". Int.J.Mod.Phys.A 30 23 (2015): 1544005-1544005. http://inspirehep.net/record/1390224.
    10.1142/S0217751X15440054
  25. Bobrovskyi, S.; Hajer, J.; Rydbeck, S.. "Long-lived higgsinos as probes of gravitino dark matter at the LHC". JHEP 02 (2013): 133-133. http://inspirehep.net/record/1203662.
    10.1007/JHEP02(2013)133
  26. Bobrovskyi, S.; Brummer, F.; Buchmuller, W.; Hajer, J.. "Searching for light higgsinos with b-jets and missing leptons". JHEP 01 (2012): 122-122. http://inspirehep.net/record/955215.
    10.1007/JHEP01(2012)122
  27. Bobrovskyi, S.; Buchmuller, W.; Hajer, J.; Schmidt, J.. "Quasi-stable neutralinos at the LHC". JHEP 09 (2011): 119-119. http://inspirehep.net/record/916988.
    10.1007/JHEP09(2011)119
  28. Bobrovskyi, Sergei; Buchmuller, Wilfried; Hajer, Jan; Schmidt, Jonas. "Broken R-Parity in the Sky and at the LHC". JHEP 10 (2010): 061-061. http://inspirehep.net/record/863312.
    10.1007/JHEP10(2010)061

Other

Software
  1. Hajer, Jan; Antusch, Stefan; Rosskopp, Johannes; Oliveira, Bruno. "pSPSS: Phenomenological symmetry protected seesaw scenario". 2022.
    10.5281/zenodo.7268418
  2. Hajer, Jan. "The hep-paper package". 2019.
    10.5281/ZENODO.3606437
  3. Hajer, Jan. "Boostedcollideranalysis/Boca: Measuring Naturalness". 2016.
    10.5281/ZENODO.168963
Activities

Supervision

Thesis Title
Role 		Degree Subject (Type)
Institution / Organization
2024/10/01 - Current Lepton number violation
Supervisor
 Phd in Physics (PhD)
2022/10/01 - 2023/11/01 Heavy Neutrino-Antineutrino Oscillations at the FCC-ee
Supervisor
 Master (Master)
Universidade de Lisboa Centro de Física Teórica de Partículas, Portugal
2021/10/01 - 2023/06/30 Heavy neutrino-antineutrino oscillations in quantum field theory : and their lepton number violating signatures at colliders
Co-supervisor
Universität Basel, Switzerland
2020/01 - 2022/01 Top quark interactions in the standard model effective field theory
Co-supervisor
Université catholique de Louvain, Belgium
2017/11 - 2020/11 Aspects of Bottom-up Hidden Sector Models
Co-supervisor
Université catholique de Louvain, Belgium
2015/01 - 2017/09 Higgs physics : from "naturalness" to collider
Co-supervisor
Hong Kong University of Science and Technology, Hong Kong SAR China
2015/01 - 2016/06
Co-supervisor
Hong Kong University of Science and Technology, Hong Kong SAR China
2013/10 - 2014/02
Co-supervisor
Hong Kong University of Science and Technology, Hong Kong SAR China
2013/10 - 2014/02
Co-supervisor
Hong Kong University of Science and Technology, Hong Kong SAR China

Conference scientific committee

Conference name Conference host
2021/04 - 2021/04 New Physics Searches in Heavy Ion Collisions ECT* - Trento
2018/12 - 2018/12 Heavy Ions and Hidden Sectors Université catholique de Louvain

Course / Discipline taught

Academic session Degree Subject (Type) Institution / Organization
2021/02 - 2021/02 Theoretical Particle Physics 2 (Master) Universität Basel, Switzerland
2020/02 - 2020/06 Quantum Mechanics I (Bachelor) Université catholique de Louvain, Belgium