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arxiv: 2306.15801 · v2 · pith:YKNXOP3Vnew · submitted 2023-06-27 · ✦ hep-ex · physics.ins-det

Production of antihydrogen atoms by 6 keV antiprotons through a positronium cloud

P. Adrich , P. Blumer , G. Caratsch , M. Chung , P. Clad\'e , P. Comini , P. Crivelli , O. Dalkarov
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P. Debu A. Douillet D. Drapier P. Froelich N. Garroum S. Guellati-Khelifa J. Guyomard P-A. Hervieux L. Hilico P. Indelicato S. Jonsell J-P. Karr B. Kim S. Kim E-S. Kim Y.J. Ko T. Kosinski N. Kuroda B.M. Latacz B. Lee H. Lee J. Lee E. Lim L. Liszkay D. Lunney G. Manfredi B. Mansouli\'e M. Matusiak V. Nesvizhevsky F. Nez S. Niang B. Ohayon K. Park N. Paul P. P\'erez C. Regenfus S. Reynaud C. Roumegou J-Y. Rouss\'e Y. Sacquin G. Sadowski J. Sarkisyan M. Sato F. Schmidt-Kaler M. Staszczak K. Szymczyk T.A. Tanaka B. Tuchming B. Vallage A. Voronin D.P. van der Werf D. Won S. Wronka Y. Yamazaki K-H. Yoo P. Yzombard
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classification ✦ hep-ex physics.ins-det
keywords antihydrogenbeampositroniumproductionantiprotonscloudacceleratorantiproton
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We report on the first production of an antihydrogen beam by charge exchange of 6.1 keV antiprotons with a cloud of positronium in the GBAR experiment at CERN. The antiproton beam was delivered by the AD/ELENA facility. The positronium target was produced from a positron beam itself obtained from an electron linear accelerator. We observe an excess over background indicating antihydrogen production with a significance of 3-4 standard deviations.

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