Measurement of the $K_L$ nuclear interaction length in the NaI(Tl)   calorimeter

M.N. Achasov; K.I. Beloborodov; A.V. Berdyugin; A.G. Bogdanchikov,; A.V. Vasiljev; V.B. Golubev; T.V. Dimova; V.P. Druzhinin; A.A. Korol; S.V.; Koshuba; E.V. Pakhtusova; S.I. Serednyakov; Z.K. Silagadze; Yu.V. Usov

arXiv:1509.01918·hep-ex·September 30, 2015

Measurement of the $K_L$ nuclear interaction length in the NaI(Tl) calorimeter

M.N. Achasov, K.I. Beloborodov, A.V. Berdyugin, A.G. Bogdanchikov,, A.V. Vasiljev, V.B. Golubev, T.V. Dimova, V.P. Druzhinin, A.A. Korol, S.V., Koshuba, E.V. Pakhtusova, S.I. Serednyakov, Z.K. Silagadze, Yu.V. Usov

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TL;DR

This paper measures the nuclear interaction length of the $K_L$ meson in NaI(Tl) calorimeter within a specific momentum range, providing data to improve simulation accuracy in particle physics experiments.

Contribution

The study provides the first direct measurement of the $K_L$ nuclear interaction length in NaI(Tl), comparing it with existing simulation values.

Findings

01

Measured $K_L$ interaction length: 30-50 cm in 0.11-0.48 GeV/$c$ range.

02

Results differ from values used in GEANT4 and UNIMOD simulations.

03

Data helps refine particle interaction models in calorimeters.

Abstract

In the study of the reaction $e^{+} e^{-} \to K_{S} K_{L}$ at the VEPP-2M $e^{+} e^{-}$ collider with the SND detector the nuclear interaction length of $K_{L}$ meson in NaI(Tl) has been measured. Its value is found to be 30--50 cm in the $K_{L}$ momentum range 0.11--0.48 GeV/ $c$ . The results are compared with the values used in the simulation programs GEANT4 and UNIMOD.

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