Электронный каталог

Статья

Gninenko, S.N.
Test of the Vector Portal with Dark Fermions in the Charge-Exchange Reactions in the NA64 Experiment at CERN SPS / S.N.Gninenko, A.S.Zhevlakov, [a.o.] // Physical Review D [Electronic resource]. – 2024. – Vol. 109, No. 7. – P. 075021. – URL: https://doi.org/10.1103/PhysRevD.109.075021. – Bibliogr.: 99.

We consider an experiment to search for dark sector particles in invisible (or semi-invisible) decays of neutral mesons 𝑀*0=𝜋*0, 𝜂, 𝜂′, 𝜔, 𝑓&sub(2)(1270), which produced the charge-exchange reactions 𝜋*-+(𝐴,𝑍)→𝑀*0+(𝐴,𝑍−1);𝑀*0→ invisible of high-energy pions (or kaons) on a nuclei target in the NA64 experiment at the CERN SPS. This reaction chain would lead to a striking signature of the signal event—the complete disappearance of the beam energy in the setup [Phys. Rev. D 91, 015004 (2015)]. Using data obtained from the measurements at IHEP (Protvino) and Fermilab (Batavia) we show that the integral cross sections 𝜎 for the production of the 𝑀*0&sub(s) slightly deviate from the phenomenological formula 𝜎∼𝑍&sup(2/3), where 𝑍 is the nuclei charge. In particular, we present the formulas for the differential and integral cross sections that explicitly depend on the Mandelstam and 𝑍 variables. Derived formulas are used to predict the 𝑀*0 yield as a function of beam energy for several target nuclei, and to estimate the projection sensitivity for the proposed search in the dark vector portal model. Sensitivity to different decay modes of 𝑀*0⁢&sub(s) is explored.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 346.4в1 - Взаимодействие пи-мезонов с ядрами
Бюллетени = 26/024