Indication of a Deeply Bound and Compact K pp State Formed in the pp ! p Kþ Reaction at 2.85 GeV
نویسندگان
چکیده
T. Yamazaki, M. Maggiora, P. Kienle, K. Suzuki, A. Amoroso, M. Alexeev, F. Balestra, Y. Bedfer, R. Bertini, L. C. Bland, A. Brenschede, F. Brochard, M. P. Bussa, Seonho Choi, M. L. Colantoni, R. Dressler, M. Dzemidzic, J.-Cl. Faivre, L. Ferrero, J. Foryciarz, I. Fröhlich, V. Frolov, R. Garfagnini, A. Grasso, S. Heinz, W.W. Jacobs, W. Kühn, A. Maggiora, D. Panzieri, H.-W. Pfaff, G. Pontecorvo, A. Popov, J. Ritman, P. Salabura, S. Sosio, V. Tchalyshev, and S. E. Vigdor Department of Physics, University of Tokyo, Tokyo, 116-0033 Japan RIKEN Nishina Center, Wako, Saitama, 351-0198 Japan Dipartimento di Fisica Generale ‘‘A. Avogadro’’ and INFN, Torino, Italy Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Vienna, Austria Excellence Cluster Universe, Technische Universität München, Garching, Germany Laboratoire National Saturne, CEA Saclay, France Indiana University Cyclotron Facility, Bloomington, Indiana, USA II. Physikalisches Institut, Universität Gießen, Germany Forschungszentrum Rossendorf, Germany M. Smoluchowski Institute of Physics, Jagellonian University, Kraków, Poland H. Niewodniczanski Institute of Nuclear Physics, Kraków, Poland Università del Piemonte Orientale and INFN, Torino, Italy (Received 27 December 2009; published 1 April 2010) We have analyzed data of the DISTO experiment on the exclusive pp ! p Kþ reaction at 2.85 GeV to search for a strongly bound compact K ppð XÞ state to be formed in the pp ! Kþ þ X reaction. The observed spectra of the Kþ missing mass and the p invariant-mass with high transverse momenta of p and Kþ revealed a broad distinct peak of 26confidence with a mass MX 1⁄4 2267 3ðstatÞ 5ðsystÞ MeV=c and a width X 1⁄4 118 8ðstatÞ 10ðsystÞ MeV. The enormously large cross section indicates formation of a compact K pp with a large binding energy of BK 1⁄4 103 MeV, which can be a possible gateway toward cold and dense kaonic nuclear matter.
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] 1 8 Fe b 20 10 Indication of a deeply bound compact K − pp state formed in the pp → p Λ K + reaction at 2 . 85 GeV
T. Yamazaki, M. Maggiora, P. Kienle, K. Suzuki, A. Amoroso, M. Alexeev, F. Balestra, Y. Bedfer, R. Bertini, L. C. Bland, A. Brenschede, F. Brochard, M. P. Bussa, Seonho Choi, M. L. Colantoni, R. Dressler, M. Dzemidzic, J.-Cl. Faivre, L. Ferrero, J. Foryciarz, I. Fröhlich, V. Frolov, R. Garfagnini, A. Grasso, S. Heinz, W. W. Jacobs, W. Kühn, A. Maggiora, D. Panzieri, H.-W. Pfaff, G. Pontecorvo, ...
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