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Large-angle production of charged pions with incident pion beams on nuclear targets

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arxiv 0907.1428 v2 pith:LW5WKZ6Z submitted 2009-07-09 hep-ex

Large-angle production of charged pions with incident pion beams on nuclear targets

The HARP Collaboration: M. Apollonio , A. Artamonov , A. Bagulya , G. Barr , A. Blondel , F. Bobisut , M. Bogomilov , M. Bonesini
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C. Booth S. Borghi S. Bunyatov J. Burguet-Castell M.G. Catanesi A. Cervera-Villanueva P. Chimenti L. Coney E. Di Capua U. Dore J. Dumarchez R. Edgecock M. Ellis F. Ferri U. Gastaldi S. Giani G. Giannini D. Gibin S. Gilardoni P. Gorbunov C. Goessling J.J. Gomez-Cadenas A. Grant J.S. Graulich G. Gregoire V. Grichine A. Grossheim A. Guglielmi L. Howlett A. Ivanchenko V. Ivanchenko A. Kayis-Topaksu M. Kirsanov D. Kolev A. Krasnoperov J. Martin-Albo C. Meurer M. Mezzetto G. B. Mills M.C. Morone P. Novella D. Orestano V. Palladino J. Panman I. Papadopoulos F. Pastore S. Piperov N. Polukhina B. Popov G. Prior E. Radicioni D. Schmitz R. Schroeter G. Skoro M. Sorel E. Tcherniaev P. Temnikov V. Tereschenko A. Tonazzo L. Tortora R. Tsenov I. Tsukerman G. Vidal-Sitjes C. Wiebusch P. Zucchelli
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classification hep-ex
keywords beamsincidenttargetswerebeamdatadouble-differentialmeasurements
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Measurements of the double-differential pi+/- production cross-section in the range of momentum 100 MeV/c <= p <= 800 MeV/c and angle 0.35 rad <= theta <= 2.15 rad using pi+/- beams incident on beryllium, aluminium, carbon, copper, tin, tantalum and lead targets are presented. The data were taken with the large acceptance HARP detector in the T9 beam line of the CERN Proton Synchrotron. The secondary pions were produced by beams in a momentum range from 3 GeV/c to 12.9 GeV/c hitting a solid target with a thickness of 5% of a nuclear interaction length. The tracking and identification of the produced particles was performed using a small-radius cylindrical time projection chamber (TPC) placed inside a solenoidal magnet. Incident particles were identified by an elaborate system of beam detectors. Results are obtained for the double-differential cross-sections d2sigma/dpdtheta at six incident beam momenta. Data at 3 GeV/c, 5 GeV/c, 8 GeV/c, and 12 GeV/c are available for all targets while additional data at 8.9 GeV/c and 12.9 GeV/c were taken in positive particle beams on Be and Al targets, respectively. The measurements are compared with several generators of GEANT4 and the MARS Monte Carlo simulation.

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