Constraints of hadronic interaction models from the cosmic muon observations. L.G. Dedenko, A.V. Lukyashin, G.F. Fedorova, T.M. Roganova M.V. Lomonosov.

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Presentation transcript:

Constraints of hadronic interaction models from the cosmic muon observations. L.G. Dedenko, A.V. Lukyashin, G.F. Fedorova, T.M. Roganova M.V. Lomonosov Moscow State University Faculty of Physics, Skobeltsin Institute of Nuclear Physics. CERN ISVHECRI 2014

CONTENT 1.Introduction (energy range, models, accelerator experiments, importance of testing) 2.Method of testing (atmospheric muon data, estimation the energy spectrum of muons) 3.Results and discussion (comparison and LHC data) 4.Conclusion

Introduction The longitudinal development of extensive air showers and, hence, the depth X max of its maximum depends strongly on the rate of the projectile particle energy E degradation. If a probability of secondary particles production in the energy range of ~0.6 · E – 0.01 · E is high then the depth X max is expected to be rather large. And contrary, in case of the severe energy degradation the length of a shower and the depth X max of its maximum will be small.

Introduction Number of high energy muons in a shower is also determined by the secondary particles produced in the energy range of ~0.6 · E – 0.01 · E This energy interval is the most important for the extensive air shower development. The study of the secondary particle production with the most considerable energies is also of importance for understanding of particle interactions. The extensive air shower data are interpreted in terms of some models of hadronic interactions. In this report we consider the QGSJET II-03 and the QGSJET II-04 models.

Introduction Usually models are tested at the accelerator experiments (e.g., LHC, LHCf and TOTEM) We suggest to test also the most popular models of hadronic interactions with the atmospheric muon data, measured with rather high accuracy. This testing is of the primary importance for the study of composition of the primary particles.

Energy spectrum and composition of the primary particles All features of the energy spectrum and composition of the primary particles are of importance to understand the origin of cosmic rays, their possible sources and a transport of particles in magnetic fields on their ways to the Earth.

Energy spectrum and composition of the primary particles Study of composition. Standard approach: The depth X max of shower maximum vs. E

Alternative approach THE FRACTION OF MUONS The ratio of signals in the underground and the surface detectors at a distance of 600 m from the shower core: α =s μ (600)/s(600)

Importance of model testing All hadronic interaction models should be tested!

Importance of model testing The Yakutsk array data interpreted in terms of the same model QGSJET II-03 gave 1) Heavy composition – no testing 2) Light composition – with testing L.G. Dedenko, G.F. Fedorova, T.M. Roganova et al., 2012, J. Phys. G: Nucl. Part. Phys

The fraction α of muons calculated in terms of the QGSJET II-03 model for the primary protons (solid line) and the primary iron nuclei (dashed line) and the Yakutsk array data vs. the signal ΔE s (600) in the SD. NO TESTING

The fraction α of muons calculated in terms of the QGSJET II-03 model for the primary protons (solid line) and the primary iron nuclei (dashed line) vs. the signal ΔE s (600). WITH TESTING

Composition with testing

Main idea of testing Using transport equations Kochanov had found in terms of the QGSJET II-03 model and the ATIC 2 primary particle spectrum the atmospheric muon energy spectrum which is by a factor 1.5 lower than data. We suggest the very simple method to simulate the muon energy specrum to test any hadronic interaction models.

A. Kochanov, PhD Thesis

Transport equations A. Kochanov had used the transport equations to estimate the muon energy spectrum. Many papers used the same method:

References Butkevich A.V. Dedenko L.G. Zheleznykh I.M. Spectra of hadrons, muons and neutrinos in the atmosphere as the solution of a direct problem // Soviet journal of Nuclear physics, USSR T-50, #1, pp Lipari P. Lepton spectra in the Earth’s atmosphere // Astropart. Phys Vol. 1. pp. 195–227. Bugaev E. V. et al. Atmospheric muon flux at sea level, underground and underwater // Phys. Rev Vol. D58. pp ; hep–ph/

References Volkova L. V. Fluxes of high and ultrahigh-energy cosmic ray muons // Bull. Russ. Acad. Sci. Phys Vol. 71. Pp. 560–563. Yushkov A. V., Lagutin A. A. Spectra of hadrons and muons in the atmosphere: Primary spectra, characteristics of hadron – air interactions // Nucl. Phys. B. (Proc. Suppl.) Vol Pp. 170–173. Kochanov A.A., Sinegovskaya T.S., Sinegovsky S.I., Calculation of the atmospheric muon flux // Astropart. Physics, 30, p.219, 2008

Suggestion We suggest to test the models of hadron interactions with the atmospheric muon data. We suggest the very simple simulations to calculate this spectrum in terms of various models.

Simulations The package CORSIKA 7.4 had been used to estimate the energy spectra of muons D(E μ ) with energies in the energy range of GeV in the atmosphere from the primary protons and He nuclei with energies within the interval GeV in terms of the QGSJET II- 03, QGSJET II-04 models with statistics 10 6 – 10 2 events.

Simulations To estimate the energy spectra of muons D(E μ ) with energies in the energy range of GeV in the atmosphere we need to know 1) the energy spectra dI p /dE and dI He /dE of the primary protons and He nuclei with energies within the interval GeV 2) the energy spectra of muons S p (E μ,E) and S He (E μ,E) calculated from the primary H and He nuclei with the fixed energies E in terms of the QGSJET II- 03, QGSJET II-04 models.

Simulations of the energy spectra of muons From the primary protons: D p (E µ ) · dE µ =∫dE · (dI p /dE ) · S p (E µ,E) · dE µ From the primary He nuclei: D He (E µ ) · dE µ =∫dE · (dI He /dE) · S He (E µ,E) · dE µ The sum D(E µ )=(D p (E µ ) + D He (E µ ))

Spectra of muons Spectrum of muons from the primary protons with fixed energy E S p (E μ,E) · dE μ Spectrum of muons from the primary He nuclei with fixed energy E S He (E μ,E) · dE μ

The energy spectra of muons generated by the primary protons with various energies E (QGSJET II-04): · 10 2, , , , , GeV;

The energy spectra of muons generated by the primary He nuclei with various energies E (QGSJET II-04): , , , , GeV.

Muon spectrum for the primary protons with the energy E=10 5 GeV in terms of the various models ● QGSJET II-03, ○ QGSJET II-04

Muon spectrum for the primary He nuclei with the energy E=10 5 GeV in terms of the various models ● QGSJET II-03, ○ QGSJET II-04

Testing Models QGSJET II- 03, S.S. Ostapchenko, Phys. Rev. D74, , 2006 QGSJET II-04, S.S. Ostapchenko, Phys. Rev. D 83, , 2011 are tested with the help of the atmospheric muon data.

Atmospheric muon data The smooth approximation of the atmospheric muon data observed by the collaborations: 1) L3+Cosmic: arXiv: hep-ex v1K (2004) 2) MACRO: M. Ambrosio et al., Phys. Rev. D 52, 3793, (1995) 3) LVD: M. Aglietta et al., arXiv: hep-ex v1, (1998) had been used for comparison with results of simulations.

Method of simulation The energy spectra and the primary particles composition: As the energy per nucleon of importance only the energy spectra of the primary protons and He nuclei should be taken into account.

Energy spectra of the primary protons and He nuclei. Yoshiki Tsunesada, Tokyo Institute of Technology, July Rapporteur Talk at 33-d ICRC 2013, Rio de Janeiro

The primary spectrum of (p+He). Dashed line − modified Gaisser-Honda approximation

The energy spectrum of the primary protons

The energy spectrum of the primary He nuclei

Approximation G&H for the primary protons and He nuclei Gaisser T. K., Honda M. Flux of atmospheric neutrinos // Ann. Rev. Nucl. Part. Sci Vol. 52. Pp. 153–199. Nuclei α K b c H (1) He (4) We will use G&H as (dI p /dE) GH and (dI He /dE) GH

Modified G&H approximation of the energy spectra of the primary particles 1. For the primary protons: (dI p /dE) m = (dI p /dE) GH · (E 1 /E) For the primary He nuclei: (dI He /dE) m = (dI He /dE) GH · (E 1 /E) 0.5 where E 1 =3 · 10 6 GeV. Modified G&H will be used at energies above E 1.

The primary spectrum of (p+He) Dashed line − the G&H and the modified Gaisser- Honda approximation. Solid line − AMS02, ○ - ATIC2, ● - CREAM, ∆ - ARGO, ■ - WCFTA, × - KASKADE (QGSJET II-03) and + - KASKADE (SIBYLL 2.1) □ - RUNJOB, ◊ - TUNKA (all particles), ▲ - SPHERE2 (all particles)

The primary spectra of (p, He) AMS02: Proc. 33-d ICRC, Rio de Janeiro, 2013 ATIC2: A.D. Panov et al., Bull. Bull. RAS, Phys.,73, 564, 2009 CREAM: H. S. Ahn et al., Astrophys. J. Lett. 714,L89-L93, 2010 ARGO: B.Bartoli et al., Phys. Rev. D, 85, , 2012 WCFTA: S.S. Zhang et al., NIM, A, 629,57-65, 2011 × KASKADE (QGSJET II-03), + KASKADE (SIBYLL 2.1): T. Antoni et al., Astropart. Phys., 24, 1-25, 2005 RUNJOB:V.A. Derbina et al., ApJ, 628, L41-L44, 2005 TUNKA (all particles), V.V. Prosin et al., Proc. 33-d ICRC, Rio de Janeiro, 2013 SPHERE2 (all particles), R.A. Antonov et al., Proc. 33-d ICRC, Rio de Janeiro, 2013

Results The simulated muon spectra in terms of the ● QGSJET II-03 and ○ QGSJET II-04 models. At energies above B~100 GeV, the simulated spectra are steepened. (the decay constant for the charged π mesons)

The calculated spectra of near vertical muons ● QGSJETII-03, ○ QGSJETII-04

Comparison with the atmospheric muon data MC/DATA: ● QGSJET II-03, ○ QGSJET II-04

At energy E μ =10 4 GeV the calculated muon spectra are by a factor ( f ) f=1.7 above the data for QGSJET II-04 f=1.5 below the data for QGSJET II-03 Strain (shift) for these series!

The LHC data Experiments: LHCf TOTEM

James L. Pinfold The University of Alberta Report at 33-d ICRC 2013, Rio de Janeiro

Summary of Physics Results from the TOTEM Experiment, Giuseppe Latino, arXiv: v1 8 Feb 2013

LHCf: forward photon production pp→γ X Forward photon energy spectrum at LHC 7 TeV p–p collisions measured by LHCf, Nuclear Instruments and Methods in Physics Research A 692 (2012) 224–227

CONCLUSION At energy E μ =10 4 GeV the calculated muon spectra are strain by a factor f=1.7 above the data for QGSJET II-04 f=1.5 below the data for QGSJET II-03 Models of hadron interaction should be updated at very high energies of secondary particles.

Acknowledgements Authors thank LSS (grant ) for support ! Thank organizing committee of the ISVHECRI 2014 for administrative support!

Thank you for attention!