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Internal Reduction method for computing Feynman Integrals: https://arxiv.org/abs/1910.06275

A new approach to compute Feynman Integrals is presented. It relies on an integral representation of a given Feynman Integral in terms of simpler ones. Using this approach, we present, for the first time, results for a certain family of non-planar five-point two-loop Master Integrals with one external off-shell particle, relevant for instance for H+2 jets production at the LHC, in both Euclidean and physical kinematical regions.
Comments: 18 pages, 4 figures, 1 table
Я давно знал, что это один человек, но теперь узнал, что сначала он был просто Джонсом:))

The Lennard-Jones potential: when (not) to use it: https://arxiv.org/abs/1910.05746

Головой с размаху плюх!

Продолжение утиных историй от 14 августа, предыдущая часть здесь. На этой фотографии хорошо видно, как они это делают: изгибают тело посередине, так, чтобы плюхнуться сразу и головой, и попой:))


DSC_0163_obr.jpg © qedqed.iMGSRC.RU


Подтверждение того, что она вынырнула:))


DSC_0164.JPG © qedqed.iMGSRC.RU
Как всегда, интересно, на каких вопросах они тестируют студентов.

Conceptualization of Electromagnetic Induction at various Educational Levels: a Case Study: https://arxiv.org/abs/1910.04491

A vast scientific literature in physics education documents a general widespread difficulty in dealing with Electro-Magnetic Induction (EMI) at various levels of instruction. But, at the best of our knowledge, there is a lack of research that compares difficulties about EMI at different educational degrees. We discuss here a case study about Italian high school, graduate students' and teacher's conceptualization of some aspects of EMI as a function of the sample instruction level. We analyse the answers to a multiple choice written questionnaire, adapted from the literature and given to a total of 49 students. Some difficulties, emerged during the exams of university students of a physics education course while discussing their final project concerning a didactical path about EMI for secondary school, are also discussed. We find that some deep misunderstandings are common at all levels of education and probably come from the very poor link, generally presented in teaching EMI, between the Faraday's flux law and the Lorentz force.
Comments: 14 pages, 6 figures

Утка-мама

Предыдущая серия здесь.


DSC_0152_obr.jpg © qedqed.iMGSRC.RU


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Dalitz-plot decomposition for three-body decays: https://arxiv.org/abs/1910.04566

We present a general formalism to write the decay amplitude for multibody reactions with explicit separation of the rotational degrees of freedom, which are well controlled by the spin of the decay particle, and dynamic functions on the subchannel invariant masses, which require modeling. Using the three-particle kinematics we demonstrate the proposed factorization, named the Dalitz-plot decomposition. The Wigner rotations, that are subtle factors needed by the isobar modeling in the helicity framework, are simplified with the proposed decomposition. Consequently, we are able to provide them in an explicit form suitable for the general case of arbitrary spins. The only unknown model-dependent factors are the isobar lineshapes that describe the subchannel dynamics. The advantages of the new decomposition are shown through three examples relevant for the recent discovery of the exotic charmonium candidate $Z_c(4430)$, the pentaquarks $P_c$, and the intriguing $\Lambda_c^+\to pK^-\pi^+$ decay.
Comments: 14 pages, 7 figures

Дым над водой

Сегодня в городе бегут какой-то марафон (особенно впечатлили люди, бегущие с привязанными к спинам белыми флагами с какой-то надписью, для пущего торможения), а духовой оркестр играет им "Дым над водой"...

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