Study of charm production in the forward cone at energy ELab ∼ 75 TeV with a two-storey X-ray emulsion chamber exposed at, mountain altitudes

A.S. Borisov; A.P. Chubenko; V.G. Denisova; V.I. Galkin; Z.M. Guseva; E.A. Kanevskaya; M.G. Kogan; V.N. Kulikov; A.E. Morozov; R.A. Mukhamedshin; V.S. Puchkov; S.I. Nazarov; S.E. Pyatovsky; G.P. Shoziyoev; M.D. Smirnova; A.V. Vargasov

doi:10.1051/epjconf/20159910004

All issues

Volume 99 (2015)

EPJ Web of Conferences, 99 (2015) 10004

Abstract

Open Access

Issue		EPJ Web of Conferences Volume 99, 2015 ISVHECRI 2014 – 18th International Symposium on Very High Energy Cosmic Ray Interactions


Article Number		10004
Number of page(s)		8
Section		Highlight Talks 4
DOI		https://doi.org/10.1051/epjconf/20159910004
Published online		04 August 2015

EPJ Web of Conferences 99, 10004 (2015)
https://doi.org/10.1051/epjconf/20159910004

Study of charm production in the forward cone at energy E_Lab ∼ 75 TeV with a two-storey X-ray emulsion chamber exposed at, mountain altitudes

A.S. Borisov¹^a, A.P. Chubenko¹, V.G. Denisova¹, V.I. Galkin², Z.M. Guseva¹, E.A. Kanevskaya¹, M.G. Kogan¹, V.N. Kulikov⁴, A.E. Morozov¹, R.A. Mukhamedshin³, V.S. Puchkov¹, S.I. Nazarov², S.E. Pyatovsky¹, G.P. Shoziyoev¹, M.D. Smirnova¹ and A.V. Vargasov¹

¹ P.N.Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia
² Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
³ Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia
⁴ TSNIIMash, Moscow region, Korolyev, Russia

^a e-mail: borisov@sci.lebedev.ru

Published online: 4 August 2015

Abstract

The origin of the cosmic ray hadron excess observed in a deep uniform lead X-ray emulsion chamber (XREC) at depths larger than 70 radiation lengths is analyzed. We present preliminary experimental data on the absorption of cosmic ray hadrons in the two-storey XREC with a large air gap exposed at the Tien Shan mountains. The design of the chamber was especially invented to prove the hypothesis on a substantial increase of the charm particle production cross section with energy at E_Lab ∼ 75 TeV as the main source of the darkness spot excess observed on X-ray films. Experimental data obtained with both a 2-storey XREC and a deep uniform XREC are compared with simulation results calculated with the FANSY 1.0 model. The comparison reveals a qualitative agreement between experimental and simulated data under the assumption of high values of charm particle production cross section at E_Lab ∼ 75 TeV in the forward kinematic region at x_Lab > 0.1.

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