Difference: FJPPLHighEnergyPhysics (11 vs. 12)
Revision 122017-09-04 - Main.PhilipBambade
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| < < | An intriguing possibility in particle theory models is that the Higgs boson may be at least partially a composite state of an underlying strong dynamics, which may also allow for the existence of other states, among which Dark Matter and new scalar, fermion and vector particles. The Yukawa structure of the Standard Model of particle physics may also be dynamically generated, so that some strong dynamics at high-energy scale may be visible as deviations in the flavour measurements or as the appearance of new particles in the physical spectrum [1,2]. This possibility can be studied in detail at the Large Hadron Collider at CERN and by other collider or high precision lower energy experiments. Apart from focussing on the more theoretical construction of the corresponding models, we also investigate in detail the bounds and discovery potential of new fundamental particles present in these models, such as new heavy vector-like quarks and other new vector [3] and scalar particles [4]. French members : P. Serpico, G. Belanger, F. Boudjema, K. Shimada Japanese members : K. Kohri, S. Iso References : [1] G.Cacciapaglia, A.Deandrea, L.Panizzi, N.Gaur, D.Harada and Y.Okada, “Heavy Vector-like Top Partners at the LHC and flavour constraints”, JHEP 1203 (2012) 070 [arXiv:1108.6329] [2] G.Cacciapaglia, A.Deandrea, N.Gaur, D.Harada, Y.Okada and L.Panizzi, “Interplay of vector-like top partner multiplets in a realistic mixing set-up,” arXiv:1502.00370 [hep-ph] [3] M.Hashimoto, “Composite Z′,” Phys. Rev. D 90 (2014) , 096004, [arXiv:1409.4954] [4] G.Cacciapaglia, A.Deandrea and M.Hashimoto, "A scalar hint from the diboson excess?,'' arXiv:1507.03098 [hep-ph] | |||||||
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| < < | New particles and interactions beyond the Standard Model (SM) of particle physics are required to explain neutrino masses and mixing angles. The search for traces of this new physics (NP) is pursued on many fronts. One possibility is to look directly for the new particles implicated in neutrino mass generation, for instance at the LHC. A complementary approach seeks indirectly new interactions among rare processes, such as charged lepton flavour violation (CLFV). CLFV transitions can be induced by the observed massive neutrinos in the SM, at unobservable rates suppressed by 10-48. A detectable rate would point to the existence of new heavy particles, as may arise in models that generate neutrino masses, or that address other puzzles of the SM such as the hierarchy problem. Observations of CLFV are therefore crucial to identifying the NP of the lepton sector, providing information complementary to direct searches. The experimental sensitivity to a wide variety of CLFV processes is systematically improving. Current bounds on branching ratios of the muon to electron flavour changing processes are currently of order of 10−13. Future experimental sensitivities should improve by several orders of magnitude, in particular, the COMET and Mu2e experiments which aim to reach a sensitivity to μ-e conversion on nuclei of ∼ 10−16. Given such rapid experimental progress in the future, our main area of research is to study in details physics opportunities for the CLFV processes, and explore new opportunities, by the joint collaboration of theorists and experimentalists between Japan and France. We have already made the first research achievement, on the study of spin-depended muon to electron conversion, which has been published in a scientific journal of Physics Letters in 2017 [1]. This physics case has never previously considered. We will explore further unique physics cases in our research collaboration. To make this goal, we are planning to organize informal meetings and workshops between French and Japanese. | |||||||
| > > | New particles and interactions beyond the Standard Model (SM) of particle physics are required to explain neutrino masses and mixing angles. The search for traces of this new physics (NP) is pursued on many fronts. One possibility is to look directly for the new particles implicated in neutrino mass generation, for instance at the LHC. A complementary approach seeks indirectly new interactions among rare processes, such as charged lepton flavour violation (CLFV). CLFV transitions can be induced by the observed massive neutrinos in the SM, at unobservable rates suppressed by 10 e-48. A detectable rate would point to the existence of new heavy particles, as may arise in models that generate neutrino masses, or that address other puzzles of the SM such as the hierarchy problem. Observations of CLFV are therefore crucial to identifying the NP of the lepton sector, providing information complementary to direct searches. The experimental sensitivity to a wide variety of CLFV processes is systematically improving. Current bounds on branching ratios of the muon to electron flavour changing processes are currently of order of 10 e-13. Future experimental sensitivities should improve by several orders of magnitude, in particular, the COMET and Mu2e experiments which aim to reach a sensitivity to μ-e conversion on nuclei of ∼ 10 e-16. Given such rapid experimental progress in the future, our main area of research is to study in details physics opportunities for the CLFV processes, and explore new opportunities, by the joint collaboration of theorists and experimentalists between Japan and France. We have already made the first research achievement, on the study of spin-depended muon to electron conversion, which has been published in a scientific journal of Physics Letters in 2017 [1]. This physics case has never previously been considered. We will explore further unique physics cases in our research collaboration. To achieve this goal, we are planning to organize informal meetings and workshops between French and Japanese. | |||||||
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French members : S. Davidson, | ||||||||
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