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Characteristics of Four Upward-pointing Cosmic-ray-like Events Observed with ANITA

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arxiv 1603.05218 v5 pith:XWBXDQK3 submitted 2016-03-16 astro-ph.HE

P.W.Gorham , J.Nam , A.Romero-Wolf , S.Hoover , P.Allison , O.Banerjee , J.J.Beatty , K.Belov
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D.Z.Besson W.R.Binns V.Bugaev P.Cao C.Chen P.Chen J.M.Clem A.Connolly B.Dailey C.Deaconu L.Cremonesi P.F.Dowkonnt M.A.Duvernois R.C.Field B.D.Fox D.Goldstein J.Gordon C.Hast C.L.Hebert B.Hill K.Hughes R.Hupe M.H.Israel A.Javaid J.Kowalski J.Lam J.G.Learned K.M.Liewer T.C.Liu J.T.Link E.Lusczek S.Matsuno B.C.Mercurio C.Miki P.Miocinovic M.Mottram K.Mulrey C.J.Naudet J.Ng R.J.Nichol K.Palladino B.F.Rauch K.Reil J.Roberts M.Rosen B.Rotter J.Russell L.Ruckman D.Saltzberg D.Seckel H.Schoorlemmer S.Stafford J.Stockham M.Stockham B.Strutt K.Tatem G.S.Varner A.G.Vieregg D.Walz S.A.Wissel F.Wu
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classification astro-ph.HE
keywords characteristicseventsfourreportanitaanita-icr-likeduring
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abstract

We report on four radio-detected cosmic-ray (CR) or CR-like events observed with the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload. Two of the four were previously identified as stratospheric CR air showers during the ANITA-I flight. A third stratospheric CR was detected during the ANITA-II flight. Here we report on characteristics these three unusual CR events, which develop nearly horizontally, 20-30~km above the surface of the Earth. In addition, we report on a fourth steeply upward-pointing ANITA-I CR-like radio event which has characteristics consistent with a primary that emerged from the surface of the ice. This suggests a possible $\tau$-lepton decay as the origin of this event, but such an interpretation would require significant suppression of the Standard Model ${\tau}$-neutrino cross section.

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