DISTO data on Kpp
M. Maggiora, P. Kienle, K. Suzuki, T. Yamazaki, DISTO Collaboration:, M. Alexeev, A. Amoroso, F. Balestra, Y. Bedfer, R. Bertini, L. C. Bland, A., Brenschede, F. Brochard, M. P. Bussa, S. Choi, M. L. Colantoni, R. Dressler,, M. Dzemidzic, J. Cl. Faivre, L. Ferrero, J. Foryciarz
TL;DR
This paper re-analyzes DISTO Collaboration data on pp collisions at 2.85 GeV to search for a deeply bound K- pp state, revealing a broad peak suggestive of such a state in the missing-mass spectra.
Contribution
It presents a new analysis of existing experimental data, identifying potential evidence for a deeply bound K- pp state in proton-proton collisions.
Findings
Identification of a broad peak at 2265 MeV/c^2 in missing-mass spectra
Evidence supporting the existence of a deeply bound K- pp state
Analysis of high transverse-momentum events enhances signal detection
Abstract
The data from the DISTO Collaboration on the exclusive pp -> p K+ Lambda production acquired at T_p = 2.85 GeV have been re-analysed in order to search for a deeply bound K- pp (= X) state, to be formed in the binary process pp -> K+ X. The preliminary spectra of the DeltaM_{K+} missing-mass and of the M_{p Lambda} invariant-mass show, for large transverse-momenta of protons and kaons, a distinct broad peak with a mass M_X = 2265 +- 2 MeV/c^2 and a width Gamma_X = 118 +- 8 MeV/c^2.
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