Measurement of the antiproton/proton ratio at TeV energies with the ARGO-YBJ detector

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Abstract

Cosmic ray antiprotons provide an important probe for the study of cosmic-ray propagation in the interstellar space and to investigate the existence of Galactic dark matter. Cosmic rays are hampered by the Moon, therefore a deficit of cosmic rays in its direction is expected (the so-called Moon shadow). The Earth–Moon system acts as a magnetic spectrometer. Infact, due to the geomagnetic field the center of the Moon shifts westward by an amount depending on the primary cosmic ray energy. Paths of primary antiprotons are therefore deflected in an opposite sense in their way to the Earth. This effect allows, in principle, the search of antiparticles in the opposite direction of the observed Moon shadow. The ARGO-YBJ experiment, in stable data taking since November 2007 with an energy threshold of a few 100s of GeV, is observing the Moon shadow with high statistical significance. Using about 1 year data, an upper limit of the proton/antiproton flux ratio in the few-TeV energy region is set to a few percent with a confidence level of 90%.

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  • B. Bartoli , P. Bernardini , X.J. Bi , C. Bleve , I. Bolognino , P. Branchini , A. Budano , A.K. Calabrese Melcarne , P. Camarri , Z. Cao , A. Cappa , R. Cardarelli , S. Catalanotti , C. Cattaneo , P. Celio , S.Z. Chen , T.L. Chen , Y. Chen , P. Creti , S.W. Cui , B.Z. Dai , G. D’Ali´ Staiti , Danzengluobu , M. Dattoli , I. De Mitri , B. D’Ettorre Piazzoli , T. Di Girolamo , X.H. Ding , G. Di Sciascio , C.F. Feng , Zhaoyang Feng , Zhenyong Feng , F. Galeazzi , P. Galeotti , E. Giroletti , Q.B. Gou , Y.Q. Guo , H.H. He , Haibing Huo , Hongbo Hue , Q. Huang , M. Iacovacci , R. Iuppa , I. James , H.Y. Jia , Labaciren , H.J. Li , J.Y. Li , X.X.Li , G. Liguori , C. Liu , C.Q. Liu , J. Liu , M.Y. Liu , H. Lu , X.H. Ma , G. Mancarella , S.M. Mari , G. Marsella , D. Martello , S. Mastroianni , P. Montini , C.C. Ning , A. Pagliaro , M. Panareo , B. Panico , L. Perrone , P. Pistilli , X.B. Qu , E. Rossi , F. Ruggieri , P. Salvini , R. Santonico , P.R. Shen , X.D. Sheng , F. Shi , C. Stanescu , A. Surdo , Y.H. Tan , P. Vallania , S. Vernetto , C. Vigorito , B. Wang , H. Wang , C.Y. Wu , H.R. Wu , B. Xu , L. Xue , Y.X. Yan , Q.Y. Yang , X.C. Yang , Z.G. Yao , A.F. Yuan , M. Zha , H.M. Zhang , JilongZhang , JianliZhang , L. Zhang , P. Zhang , X.Y. Zhang , Y. Zhang , Zhaxiciren , Zhaxisangzhu , X.X. Zhou , F.R. Zhu , Q.Q. Zhu , G. Zizzi

Titolo volume/Rivista

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT

Anno di pubblicazione

2011

ISSN

0168-9002

ISBN

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