| Literature DB >> 20481879 |
T Yamazaki1, 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, S E Vigdor.
Abstract
We have analyzed data of the DISTO experiment on the exclusive pp --> pLambdaK+ reaction at 2.85 GeV to search for a strongly bound compact K- pp(approximately = X) state to be formed in the pp --> K+ + X reaction. The observed spectra of the K+ missing mass and the pLambda invariant-mass with high transverse momenta of p and K+ revealed a broad distinct peak of 26-sigma confidence with a mass M(X)=2267+/-3(stat)+/-5(syst) MeV/c2 and a width Gamma(X)=118+/-8(stat)+/-10(syst) MeV. The enormously large cross section indicates formation of a compact K- pp with a large binding energy of B(K)=103 MeV, which can be a possible gateway toward cold and dense kaonic nuclear matter.Entities:
Year: 2010 PMID： 20481879 DOI： 10.1103/PhysRevLett.104.132502
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161