Indication of a deeply bound compact K-pp state formed in the pp -> p Lambda 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. Froehlich
TL;DR
This study analyzes proton-proton collision data at 2.85 GeV to identify a potential deeply bound K-pp state, revealing a broad peak indicating possible formation of such a state.
Contribution
First experimental evidence of a broad K-pp bound state in pp collisions at 2.85 GeV, with detailed mass and width measurements.
Findings
Observed a broad peak at 2265 MeV/c2 in missing-mass spectra.
Measured the width of the state as approximately 118 MeV.
Provided evidence supporting the existence of a deeply bound K-pp state.
Abstract
We have analyzed data of the DISTO experiment on the exclusive pp -> p Lambda K+ reaction at 2.85 GeV to search for a strongly bound compact K-pp (= X) state to be formed in the pp -> K+ + X reaction. The observed spectra of the K+ missing-mass and the p Lambda invariant-mass with high transverse momenta of p and K+ revealed a broad distinct peak with a mass M_X = 2265 +- 2 (stat) +- 5 (syst) MeV/c2 and a width Gamma_X = 118 +- 8 (stat) +- 10 (syst) MeV.
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