Croatian Science Foundation Research Project
Project: PHYSICS OF THE STANDARD MODEL AND BEYOND (PhySMaB)
Principal Investigator (PI): Blaženka Melić, Prof. Dr.sc. (Dr.rer.nat) - senior scientist,
Rudjer Bošković Institute (RBI)
- Goran Duplančić, Dr.sc. (PhD) - research associate, RBI
- Fabrizio Nesti, Dr. sc. (PhD) - senior research associate, RBI
- Bene Nižić, Dr.sc. (PhD) - research associate, RBI
- Kornelija Passek – Kumerički, Dr.sc. (PhD) - research associate, RBI
- Monalisa Patra, Dr.sc. (PhD) - postdoc, RBI
- Bruno Klajn, Dr.sc. (PhD) - research assistant, RBI
- Goran Popara, Mag.Phys. - PhD student, RBI (employed by the project)
- Foreseen future collaborators (approved appointments):
- one PhD student (period: three years)
- one postdoc student (period: two years)
Starting date: 1.10.2014.
Ending date: 30.9.2018.
Project proposal summary
The proposed project situated in the realm of theoretical particle physics is devoted to selected investigations in the framework of the Standard Model (SM) and beyond. The proposed activities include SM calculations of pertubative and nonperturbative phenomena in Quantum Chromodynamics (QCD), theoretical and phenomenological analysis of top-quark physics and investigation of NP models by comparing with experimental data. The first results from the LHC have already provided triumphant discovery of the Higgs boson particle and considerable advances in flavour physics, all in the agreement with the SM predictions, and significant further progress is anticipated in the coming years. So far there is no compelling evidence for beyond SM physics in the quark sector, but the ongoing investigations at TeV scale could lead to the appearance of NP and a beginning of a new era.
The intellectual merit of the activities proposed here is to provide theoretical support and calculational tools necessary to fully exploit the collider physics potential, closely interacting with the Croatian experimental groups already involved in the experiments at LHC.
The outlined proposal will be based on the research at two fronts: improving our understanding of the SM physics and searching for the theoretically-required evidence of New Physics (NP) beyond the Standard Model (BSM).
In high energy particle physics it is widely believed that the energy frontier experiments at LHC and the planned linear colliders, ILC and/or CLIC, together with ongoing and new experiments in neutrino and flavour physics will unravel fundamental problems in particle and astroparticle physics. A prerequisite for this progress is the complete understanding of the Standard model (SM) predictions. One of the triumphs of SM physics has been the extent to which QCD successfully describes strong interaction processes observed at colliders. More accurate QCD calculations are absolutely essential in understanding the enormous amount of available high-precision data, particularly since new physics effects are obscured by standard QCD processes. Our focus in that area will be to improve the description of hard exclusive processes by including higher-order contributions and by further developing the corresponding methods for automatic QCD calculations. Furthermore, we plan to do precision studies of top-quark production and decay observables which provide a unique view to the mechanism of electroweak symmetry breaking, important for understanding of particle mass generation. In the top-quark decay the information about its spin polarization imprinted by the production process is preserved, and can be calculated and measured in angular distributions of decay products providing other way to search for deviations from the SM expectations. Regarding new physics, the fact that neutrinos have a mass already requires an extension of the SM and calls for an understanding of the origin of neutrino masses. The seesaw mechanism, included in a theory as the one where left-right symmetry (parity) is restored at accessible LHC energies, stands out as a prominent theoretical candidate, and this theory links the origin of neutrino masses to new interactions at high energies and to the restoration of parity. A phenomenological investigation of these predictions is thus compelling and timely.
Using Spin Observables and Polarizations to Probe Top-Higgs FCNC Couplings at Colliders, Kruger Gate, South Africa, 3-9 December, 2016,
Blaženka Melić, Monalisa Patra.
Proceedings of International Workshop Discovery at the LHC, Kruger2016
Next-to-leading order corrections to deeply virtual production of pseudoscalar mesons
Goran Duplančić, Dieter Müller, Kornelija Passek-Kumerički. Dec 6, 2016. 13 pp.
Submitted in Physical Letters B
Exploring the Top-Higgs FCNC Couplings at Polarized Linear Colliders with Top Spin Observables
Blaženka Melić, Monalisa Patra. Oct 10, 2016. 32 pp.
Published in JHEP 1701 (2017) 048
Probing Higgs-radion mixing in warped models through complementary searches at the LHC and the ILC
Mariana Frank (Concordia U., Montreal), Katri Huitu (Helsinki U. & Helsinki Inst. of Phys.), Ushoshi Maitra (TIFR, Mumbai, Dept. Theor. Phys.), Monalisa Patra (Boskovic Inst., Zagreb). Jun 24, 2016. 27 pp.
Published in Phys. Rev. D 94, 055016 (2016)
LNV Higgses at LHC
Alessio Maiezza (Valencia U., IFIC), Miha Nemevšek (Stefan Inst., Ljubljana), Fabrizio Nesti (Boskovic Inst., Zagreb). Jun 21, 2016.
Published in AIP Conf.Proc. 1743 (2016) 030008
Direct numerical approach to one-loop amplitudes
Goran Duplancic, Bruno Klajn. Apr 24, 2016. 7 pp.
Published in Phys. Rev. D 95, 016002 (2017)
Perturbativity and mass scales of Left-Right Higgs bosons
Alessio Maiezza (Valencia U., IFIC), Miha Nemevšek (Stefan Inst., Ljubljana), Fabrizio Nesti (Boskovic Inst., Zagreb). Mar 1, 2016. 11 pp.
Published in Phys. Rev. D 94, 035008 (2016)
Form factors of B, Bs -> eta, eta' and D, Ds -> eta, eta' transitions from QCD light-cone sum rules
Goran Duplancic, Blazenka Melic. Aug 21, 2015. 36 pp.
Published in JHEP 1511 (2015) 138
Lepton Number Violation in Higgs Decay at LHC
Alessio Maiezza (Valencia U., IFIC), Miha Nemevšek (Stefan Inst., Ljubljana), Fabrizio Nesti (Boskovic Inst., Zagreb). Mar 23, 2015. 7 pp.
Published in Phys.Rev.Lett. 115 (2015) 081802
DIFFRACTION 2014: International Workshop on Diffraction in High-Energy Physics, Primošten, Croatia, 10-16 September 2014
Capua, Marcella; Fiore, Roberto; Kumerički, Krešimir; Papa, Alessandro; Passek-Kumerički, Kornelija; Tassi, Enrico; Vacca, Gian Paolo (ed.).
Published in AIP Conf. Proc. 1654 (2015).
Present and Future K and B Meson Mixing Constraints on TeV Scale Left-Right Symmetry
Stefano Bertolini (SISSA, Trieste & INFN, Trieste), Alessio Maiezza (Valencia U., IFIC), Fabrizio Nesti (Boskovic Inst., Zagreb & GSSI, Aquila). Mar 27, 2014. 15 pp.
Published in Phys.Rev. D89 (2014) 9, 095028
Conference attendance and talks
- Fabrizio Nesti
- "Neutrinos at LHC - theory and experiment", review talk at "LHC days in Split", September 29-October 4, 2014 in Split, Croatia
- "LNV Higgs Collider", talk at Workshop "Particle Phenomenology From the Early Universe to High Energy Colliders", 7-10 April 2015 in Portoroz, Slovenia
- "From Neutrino Masses to Lepton Number Violation at LHC", talk at SISSA, Trieste, May 2015
- "From Neutrino Masses to Lepton Number Violation at LHC", talk at Rudjer Boskovic Institute, May 2015
- "Lepton Number Violating Higgs decays at Colliders", talk at QUARKS-2016, May 29-June 4, 2016 in St. Petersburg, Russia
- "Fermionic warm dark matter and limits from the smallest dwarf galaxies", talk at "LHC days in Split", September 19-24, 2016 in Split, Croatia
- "Majorana Higgses at Colliders - testing the origin of neutrino masses", talk at the International Workshop Selected topics in flavor and collider physics, Brda2016, October 19 - 21 2016, Brda, Slovenia
- Blaženka Melić
- MIAPP workshop, "Indirect Searches for New Physics in the LHC and Flavour Precision Era", June 1 - 26, 2015 in Munich. Gemany
- Workshop "Particle Phenomenology From the Early Universe to High Energy Colliders", 7-10 April 2015 in Portoroz, Slovenia
- "Exploring the Top-Higgs FCNC Couplings at Colliders", talk at the International Workshop "Hadronic Contributions to New Physics Searches", 25-30 September 2016 in Puerto de la Cruz, Tenerife, Spain
- "Exploring the top-Higgs FCNC couplings at colliders", talk at the International Workshop Selected topics in flavor and collider physics, Brda2016, October 19 - 21, 2016, Brda, Slovenia
- "Using spin correlations to probe top-Higgs FCNC couplings at colliders", talk at the International Workshop Discovery at the LHC, Kruger2016, December 3 - 9, 2016, Kruger Gate, South Africa
- Kornelija Passek – Kumerički
- "Introduction to Generalized Parton Distributions, DVCS and DVMP", invited lecture at WE-Heraeus Physics School, "Diffractive and electromagnetic processes at high-energies", Bad Honnef, Aug 17-21, 2015
- "Generalized parton distributions (GPDs) through DVCS and DVMP", talk at ACHT2015, "Strong Interactions in Quantum Field Theory", 7th - 9th October 2015, Leibnitz
- Third International Summer School of QCD - Dense systems in QCD at asymptotical energies, Orsay, June 20-July 1, 2016
- Bruno Klajn
- WE-Heraeus Physics School, "Diffractive and electromagnetic processes at high-energies", Bad Honnef, Aug 17-21, 2015
- "Direct numerical approach to one-loop amplitudes", talk at INFN, Padova, May 12, 2016
- "Direct numerical approach to one-loop amplitudes", talk at Third International Summer School of QCD, "Dense systems in QCD at asymptotical energies", Orsay, Jun 20-Jul 1, 2016
- "Direct numerical calculation of one-loop Feynman diagrams", talk at Austrian-Croatian-Hungarian 2016 Meeting, "Non-perturbative aspects of Quantum Field Theory", Čakovec, Croatia, 05 - 07 October 2016
- Goran Popara
- 52 Winter School of Theoretical Physics "Theoretical Aspects of Neutrino Physics", Lądek Zdrój, Poland, Feb 14-21, 2016
- "Left-right symmetry and light window for right-handed neutrinos at LHC", talk at Sixth IDPASC School, Vipava, Slovenia, May 23-Jun 1, 2016
- "LHC Days in Split, Split, Croatia, September 19-24, 2016
- "Light window for right-handed neutrinos in the Left-Right model", talk at the International Workshop Selected topics in flavor and collider physics, Brda2016, October 19 - 21, 2016, Brda, Slovenia
Organization of conferences and workshops
- K.Passek-Kumericki, member of the organizing committee, "Third International Summer School of QCD - Dense systems in QCD at asymptotical energies", Orsay, June 20-July 1, 2016
- F. Nesti, member of the organizing committee, "LHC days in Split", 19-24 September 2016, Split, Croatia
- B. Melic, member of the international advisory committee, "LHC days in Split", 19-24 September 2016, Split, Croatia
- Gravitation and Cosmology, lectures, postgradute study at University of Zagreb, Fabrizio Nesti
- Quantum Field Theory, lectures, postgradute study at University of Zagreb, Bene Nižić
- Elementary Particles, lectures, postgradute study at University of Zagreb, Blaženka Melić
- Effective Field Theory and Heavy Quark Physics, lectures, postgradute study at University of Zagreb, Blaženka Melić
- Elementary Particle Physics, lectures, graduate study at University of Rijeka, Blazenka Melic
- Quantum Physics, graduate study at University of Zagreb, Kornelija Passek – Kumerički
- General Physics, graduate study at University of Zagreb, Bruno Klajn
Particle Physics and Cosmology group at Theoretical Physics Division, Rudjer Boskovic Institute, Zagreb plans to make appointments in theoretical high energy physics for PhD and postdoc students in the context of the project Physics of Standard Model and Beyond (PhSMaB) starting in fall 2016.
Prof. dr. Blazenka Melic, principal investigator
Head of Particle Physics and Cosmology Group
Division of Theoretical Physics
Rudjer Boskovic Institute