Forward photon energy spectrum at LHC 7TeV p–p collisions measured by LHCf

Menjo, H.; Адриани, О.; Bongi, M.; Castellini, G.; D’Alessandro, R.; Fukatsu, K.; Haguenauer, M.; Itow, Y.; Kasahara, K.; Kawade, K.; Macina, D.; Mase, T.; Masuda, K.; Mitsuka, G.; Muraki, Y.; Nakai, M.; Noda, K.; Papini, P.; Perrot, A. L.; Ricciarini, S.; Sako, T.; Shimizu, Yuki; Suzuki, K.; Suzuki, T.; Taki, K.; Tamura, T.; Torii, Shoji; Tricomi, A.; Turner, W. C.

doi:10.1016/j.nima.2011.12.071

Cited by 9 publications

(9 citation statements)

References 8 publications

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“…According to calculations, the main contribution to the integrals D p (E µ ) · d E µ and D He (E µ ) · d E µ comes from secondary particles with energies in the ranges of (0.01-0.6)E and (0.001-0.1)E, where E is the energy of a projectile particle for primary protons and helium nuclei, respectively. The results of this comparison are also confirmed by the data of LHCf [6] and TOTEM [7].…”

Section: The Results Of Simulationssupporting

confidence: 78%

“…At energies above E 1 = 3 · 10 6 GeV, these spectra were multiplied by a factor (E 1 /E) 0.5 and are refered as modified GH approximation. Figure 1 shows a comparison of the sum of modified GH approximations [13] for primary protons and helium nuclei (dotted line) with the experimental data AMS02 [14] [20], interpreted in terms of the model of QGSJET II-03 shows the oblique crosses (×), and in terms of the model SIBYLL 2.1 -straight crosses (+).…”

Section: Methods Of Calculationmentioning

confidence: 99%

“…Therefore, testing models at the highest energies of secondary particles is very important for understanding the physics of hadron interactions and for the interpretation of the EAS data. At the LHC this testing is carried out in the LHCf [6] and TOTEM [7] experiments. In cosmic rays, we suggest testing of models of hadron interactions with the help of the atmospheric muon spectrum.…”

Section: Introductionmentioning

confidence: 99%

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Constraints of hadronic interaction models from the cosmic muon observations

Dedenko

Lukyashin

Fedorova

et al. 2015

EPJ Web of Conferences

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Abstract.A simple method of the vertical muon energy spectrum simulations has been suggested. These calculations have been carried out in terms of various models of hadronic interactions. The most energetic π ± -mesons and K ± -mesons produced in hadron interactions contribute mainly to this energy spectrum of muons due to the very steep energy spectrum of the primary particles. So, some constraints on the hadronic interaction models may be set from a comparison of calculated results with cosmic data on the vertical muon energy spectrum. This comparison showed that the most energetic secondary particles production is too high in the case of the QGSJET II-04 model and rather low in the case of the QGSJET II-03 model. These conclusion have been supported by the LHC data.

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Section: The Results Of Simulationssupporting

confidence: 78%

Section: Methods Of Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Constraints of hadronic interaction models from the cosmic muon observations

Dedenko

Lukyashin

Fedorova

et al. 2015

EPJ Web of Conferences

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“…Theoretical models predict a rigidity dependent spectrum, and the kneelike feature observed in the all-particle spectrum may correspond to the maximum rigidity to which the dominant population of sources can accelerate cosmic rays, or may be related to the leakage from our Galaxy. This interpretation is further supported by the LHC results which exclude any dramatic change in the features of the hadronic interaction at least up to 10 17 eV [42]. Thus the determination of the shape of the energy spectrum of proton and helium primaries, the most abundant elements and the first ones to reach the maximum acceleration energy, is of special relevance to understand cosmic ray acceleration and propagation in the Galaxy.…”

Section: Discussionmentioning

confidence: 61%

Knee of the cosmic hydrogen and helium spectrum below 1 PeV measured by ARGO-YBJ and a Cherenkov telescope of LHAASO

Bartoli¹,

Bernardini²,

Bi³

et al. 2015

Phys. Rev. D

119

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The measurement of the cosmic ray energy spectrum, in particular for individual species of nuclei, is an important tool to investigate cosmic ray production and propagation mechanisms. The determination of the "knees" in the spectra of different species remains one of the main challenges in cosmic ray physics. In fact, experimental results are still conflicting. In this paper we report a measurement of the mixed proton and helium energy spectrum, obtained with the combined data of the ARGO-YBJ experiment and a wide field of view Cherenkov telescope, a prototype of the future LHAASO experiment. By means of a multiparameter technique, we have selected a high-purity proton plus helium sample. The reconstructed energy resolution is found to be about 25% throughout the investigated energy range from 100 TeV to 3 PeV, with a systematic uncertainty in the absolute energy scale of 9.7%. The found energy spectrum can be fitted with a broken power-law function, with a break at the energy E k ¼ 700 AE 230ðstatÞ AE 70ðsysÞ TeV, where the spectral * zhangss@ihep.ac.cn † caozh@ihep.ac.cn PHYSICAL REVIEW D 92, 092005 (2015) 1550-7998=2015=92(9)=092005 (12) 092005-1 © 2015 American Physical Society index changes from −2.56 AE 0.05 to −3.24 AE 0.36. The statistical significance of the observed spectral break is 4.2 standard deviations.

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“…Different validations of the MC codes against the π 0 and γ -ray experimental data at the LHC energies (see e.g. [13][14][15][16]) show that none of the MC models is able to explain fully all the available experimental data. It is for this reason that we parametrize different models which are representative of different descriptions of hadronic interactions.…”

Section: Discussionmentioning

confidence: 99%