Theory Division

  • Theory Division

    The IFAE Theory division research focuses on Standard Model, Flavor Physics, Beyond the Standard Model, and Astroparticle and Cosmology issues. The divison is led by R. Escribano and its work comprises three main lines of research:

    Standard Model Physics and Flavor Physics (in and beyond the Standard Model)

    Working on non-perturbative aspects of QCD, quarkonium physics, and heavy-flavor physics: rare B meson decays and CP violation.

    Recent highlights include the work on the theoretical framework underpinning the so called B-flavour anomalies, a new hyperasymptotic approximation to the operator product expansion, and the precise determination of the strong coupling constant below the charm threshold.

    This research line is led by J. Matias.


    Beyond the Standard Model physics

    Working on the most intriguing questions in particle physics: the origin of the flatness and largeness of the universe, the origin of baryons and dark matter, the smallness of the Higgs mass (the hierarchy problem), or the smallness of the theta-term (the strong CP problem).

    The group has presented several novel theoretical scenarios addressing these questions that have motivated many experimental searches. They are also known for their work on more theoretical aspects, like the use of the AdS/CFT correspondence to obtain properties of strongly-coupled system.

    This research line is led by A. Pomarol.


    Astroparticle Physics and Cosmology,

    Working on dark energy, dark matter models, early-universe cosmology and on, arguably, the most enigmatic of the fundamental forces — gravity.

    Group members have made important contributions to scenarios where gravity is modified at large distances and to Lorentz-violating scenarios of quantum gravity. The group has an extended research record on axion physics, from both the phenomenology and theoretical sides. More recently, the group is contributing to primordial black hole physics, ultra-light dark matter scenarios and gravitational-wave physics from the fundamental physics perspective.

    This research line is led by O. Pujolàs.

  • Group Members

    Theory Division

    Staff Researcher

    • Rafel Escribano

      Rafel Escribano

    • Eduard Masso

      Eduard Masso

    • Joaquim Matias

      Joaquim Matias

    • Antoni Méndez

      Antoni Méndez

    • Ramon Pascual

      Ramon Pascual

    • Santi Peris

      Santi Peris

    • Antonio Pineda

      Antonio Pineda

    • Àlex Pomarol

      Àlex Pomarol

    • Oriol Pujolàs

      Oriol Pujolàs

    • Mariano Quirós

      Mariano Quirós

    Postdoc Researcher

    • Luigi Delle Rose

      Luigi Delle Rose

    • Pere Masjuan

      Pere Masjuan

    • Evangelos Sfakianakis

      Evangelos Sfakianakis

    • Pablo Sánchez

      Pablo Sánchez

    • Ville Vaskonen

      Ville Vaskonen

    • Benedict Von Harling

      Benedict Von Harling

    • George  Zahariade

      George Zahariade

    • Ricardo Zambujal

      Ricardo Zambujal

    PhD Student

    • Cristian Alarcon

      Cristian Alarcon

    • Marcel Algueró

      Marcel Algueró

    • Yann Cado

      Yann Cado

    • Clara Fernández

      Clara Fernández

    • Angel Gil

      Angel Gil

    • Jan Ollé

      Jan Ollé

    • Lindber Salas

      Lindber Salas

    • Fabio Van Dissel

      Fabio Van Dissel

  • Selected Publications

    Theory Division

    • Blum T et al.,
      Light quark vacuum polarization at the physical point and contribution to the muon g-2,
      Physical Review d 101 (2020) [DOI]
    • Lobregat X et al.,
      Hyperasymptotic approximation to the top, bottom, and charm pole mass,
      Physical Review d 101 (2020) [DOI]
    • Khoze VV et al.,
      The axion mass from 5D small instantons,
      Journal Of High Energy Physics 2020 (2020) [DOI]
    • Cancer Castillo, Victor et al.,
      Scale invariant solids,
      Physical Review d 101 (2020) [DOI]
    • Urquijo P et al.,
      Erratum: The Belle II Physics Book (Progress of Theoretical and Experimental Physics (2019) 2019 (123C01) DOI: 10.1093/ptep/ptz106),
      Progress Of Theoretical And Experimental Physics 2020 (2020) [DOI]
    • Pujolàs O et al.,
      Oscillons and dark matter,
      Journal Of Cosmology And Astroparticle Physics 2020 (2020) [DOI]
    • Quirós M et al.,
      Dark CP violation and gauged lepton or baryon number for electroweak baryogenesis,
      Physical Review d 101 (2020) [DOI]
    • Sanchez-Puertas P et al.,
      Axial-vector exchange contribution to the hadronic light-by-light piece of the muon anomalous magnetic moment,
      Physical Review d 101 (2020) [DOI]
    • Pomarol A et al.,
      Peccei-Quinn phase transition at LIGO,
      Journal Of High Energy Physics 2020 (2020) [DOI]
    • Lai, Wai Kin et al.,
      QCD spin effects in the heavy hybrid potentials and spectra,
      Physical Review d 101 (2020) [DOI]
    • Royo E et al.,
      π0-η-η′ mixing from V → Pγ and P → Vγ decays,
      Physics Letters b 807 (2020) [DOI]
    • Capdevila B et al.,
      Addendum to: Emerging patterns of New Physics with and without Lepton Flavour Universal contributions,
      European Physical Journal c 80 (2020) [DOI]
    • Descotes-Genon S et al.,
      Symmetries in B → D ∗ ℓν angular observables,
      Journal Of High Energy Physics 2020 (2020) [DOI]
    • Lobregat X et al.,
      Hyperasymptotic approximation to the operator product expansion,
      Nuclear And Particle Physics Proceedings 309-311 (2020) [DOI]
    • Masjuan P et al.,
      Higher-order QCD corrections to hadronic τ decays from Padé approximants,
      Nuclear And Particle Physics Proceedings 309-311 (2020) [DOI]
    • Rey, Julian et al.,
      Detuning primordial black hole dark matter with early matter domination and axion monodromy,
      Journal Of Cosmology And Astroparticle Physics 2020 (2020) [DOI]
    • Lobregat X et al.,
      Determination of α(Mz) from an hyperasymptotic approximation to the energy of a static quark-antiquark pair,
      Journal Of High Energy Physics 2020 (2020) [DOI]
    • Gonzalez-Solis, Sergi et al.,
      Theoretical analysis of the doubly radiative decays eta(()'()) -> pi(0)gamma gamma and eta ' -> eta gamma gamma,
      Physical Review d 102 (2020) [DOI]
    • Fernandez C et al.,
      Renormalization of higher-dimensional operators from on-shell amplitudes,
      Nuclear Physics b 959 (2020) [DOI]
    • Castillo VC et al.,
      Black rubber and the non-linear elastic response of scale invariant solids,
      Journal Of High Energy Physics 2020 (2020) [DOI]
    • Baggioli, Matteo et al.,
      Elasticity bounds from effective field theory (vol 100, 065015, 2019),
      Physical Review d 102 (2020) [DOI]
    • Nardini, Germano et al.,
      Gravitational imprints from heavy Kaluza-Klein resonances,
      Physical Review d 102 (2020) [DOI]
    • Tarrus Castella, Jaume et al.,
      Effective field theory for double heavy baryons at strong coupling,
      Physical Review d 102 (2020) [DOI]
    • Tarrus Castella, Jaume et al.,
      Nonrelativistic effective field theory for heavy exotic hadrons,
      Physical Review d 102 (2020) [DOI]
    • Lai WK et al.,
      Erratum: Spin structure of heavy-quark hybrids (Physical Review D (2019) 99 (014017) DOI: 10.1103/PhysRevD.99.014017),
      Physical Review d 101 (2020) [DOI]
    • Asmussen N et al.,
      The anomalous magnetic moment of the muon in the Standard Model,
      Physics Reports 887 (2020) [DOI]
    • Barnett RM et al.,
      Review of particle physics,
      Progress Of Theoretical And Experimental Physics 2020 (2020) [DOI]
    • Blum T et al.,
      Application of effective field theory to finite-volume effects in aμHVP,
      Physical Review d 102 (2020) [DOI]
    • Lobregat X et al.,
      Hyperasymptotic approximation to the plaquette and determination of the gluon condensate,
      Journal Of High Energy Physics 2020 (2020) [DOI]
    • Royo E et al.,
      A theoretical analysis of the semileptonic decays η(′)→ πl+l- and η′→ ηl+l-,
      European Physical Journal c 80 (2020) [DOI]
  • Group News

    New IFAE Members

    New Member in the Theory group

    June 2, 2021

    Cristian Alarcon has just joined the Theory Group.


    16th International Workshop on Meson Physics

    May 26, 2021

    Two members of the Theory group contributed talks to MESON 2021 17-20 May 2021


    New Theory group publication

    May 19, 2021

    “On broad Kaluza-Klein gluons” by R. Escribano, M. Mendizabal, M. Quirós and E. Royo has been published in J. High Energ. Phys. 2021, 121 (2021)

    In the Media

    Latest and Fermilab and LHCb results in the media

    April 21, 2021

    Two new articles about the latest Fermilab g-2 Experiment and LHCb results quoting IFAE researchers published in El Mundo and El Pais

    In the Media

    Latest Fermilab results at diari ARA

    April 9, 2021

    Pere Masjuan is quoted in an article in the diari Ara about the lastest Fermilab’s Muon g-2 experiment results.

    New experimental results

    LHCb results strengthen hints of a violation of lepton flavour universality

    April 7, 2021

    LHCb has overcome the 3 sigma barrier in the tension between the measurement of the observable RK and the prediction of the SM, reaching 3.1 sigmas. This observable tests the universality (or not) of leptonic flavor. The SM predicts a value of 1 very accurately for this observable.