Modified Perturbation Theory for Pair Production and Decay of Fundamental Unstable Particles

Nekrasov, M. L.

doi:10.1142/s0217751x09047673

Cited by 13 publications

(43 citation statements)

References 37 publications

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“…p j ) , (39) where PV denotes the principal value (understood as a distribution, see Ref. 113 ). It would be convenient to define POs through a factorisation of the process into sub-processes, e.g.…”

Section: Lhc Pseudo-observablesmentioning

confidence: 99%

Higgs boson couplings: Measurements and theoretical interpretation

Mariotti

Passarino

2017

Int. J. Mod. Phys. A

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Section: Lhc Pseudo-observablesmentioning

confidence: 99%

Higgs boson couplings: Measurements and theoretical interpretation

Mariotti

Passarino

2017

Int. J. Mod. Phys. A

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“…Furthermore, the MPE should be understood as an "asymptotic expansion", see Refs. [71,72], not as a narrow-width approximation (NWA). The phase space decomposition is obtained by using the two parts in the propagator expansion of Eq.…”

Section: The Strategy: From the Multi-pole Expansion To Pseudo-observmentioning

confidence: 99%

Through precision straits to next standard model heights

David

Passarino

2016

Reviews in Physics

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After the LHC Run 1, the standard model (SM) of particle physics has been completed. Yet, despite its successes, the SM has shortcomings vis-\`{a}-vis cosmological and other observations. At the same time, while the LHC restarts for Run 2 at 13 TeV, there is presently a lack of direct evidence for new physics phenomena at the accelerator energy frontier. From this state of affairs arises the need for a consistent theoretical framework in which deviations from the SM predictions can be calculated and compared to precision measurements. Such a framework should be able to comprehensively make use of all measurements in all sectors of particle physics, including LHC Higgs measurements, past electroweak precision data, electric dipole moment, $g-2$, penguins and flavor physics, neutrino scattering, deep inelastic scattering, low-energy $e^{+}e^{-}$ scattering, mass measurements, and any search for physics beyond the SM. By simultaneously describing all existing measurements, this framework then becomes an intermediate step, pointing us toward the next SM, and hopefully revealing the underlying symmetries. We review the role that the standard model effective field theory (SMEFT) could play in this context, as a consistent, complete, and calculable generalization of the SM in the absence of light new physics. We discuss the relationship of the SMEFT with the existing kappa-framework for Higgs boson couplings characterization and the use of pseudo-observables, that insulate experimental results from refinements due to ever-improving calculations. The LHC context, as well as that of previous and future accelerators and experiments, is also addressed.Comment: 19 pages, 3 figure

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“…The second remark concerns the single-resonant and interference contributions. Actually this issue was discussed earlier [10], and it was shown that such contributions may be taken into consideration precisely by the same technique as discussed above. So in these cases our results about the precision of the MPTdescription must be in force, as well.…”

Section: Discussionmentioning

confidence: 87%

“…For this reason we do not discuss C ν n 1 ,n 2 below.) In the original work [10] the basic integrals were calculated at non-integer ν, and only half-integer ν was needed in the final stage with smooth Φ. At the same time, a transition to integer ν was not obvious because of singular behavior of some factors.…”

Section: Mpt For Angular Distributionmentioning

confidence: 99%

Modified Perturbation Theory for Angular Distribution in W-Pair Production

Nekrasov

2012

Mod. Phys. Lett. A

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We examine the capabilities of the modified perturbation theory (MPT) for description of W -pair production and decay in e + e − annihilation. In a model with Dyson-resummed propagators of unstable particles, we calculate even and odd contributions to the distribution in the cosine of the W − production angle relative to the e − beam. On comparing the results of calculations in the NNLO approximation of MPT with the exact results in the model, a coincidence of outcomes at the ILC energies is detected at the per-mille level.

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Modified Perturbation Theory for Pair Production and Decay of Fundamental Unstable Particles

Cited by 13 publications

References 37 publications

Higgs boson couplings: Measurements and theoretical interpretation

Higgs boson couplings: Measurements and theoretical interpretation

Through precision straits to next standard model heights

Modified Perturbation Theory for Angular Distribution in W-Pair Production

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