Theoretical analysis of Lambda(1405) --> (Sigma pi)^0 mass spectra produced in p+p --> p + Lambda(1405) + K^+ reactions

Abstract

We formulated the Lambda(1405) (abbreviated as Lambda^*) --> (Sigma pi)^0 invariant-mass spectra produced in p+p --> p + Lambda^* + K^+ reactions, in which both the incident channel for a quasi-bound K^-p state and its decay process to (Sigma pi)^0 were taken into account realistically. We calculated M(Sigma pi) spectral shapes for various theoretical models for Lambda^*. They are asymmetric and skewed, and were compared with recent experimental data of HADES, yielding M(Lambda^*) = 1405 -9 +11 MeV/c^2 and Gamma = 62 +- 10 MeV, where the interference effects of the Kbar N-Sigma pi resonance with I= 0 and 1 Sigma pi continuum are considered. The nearly isotropic proton distribution observed in DISTO and HADES is ascribed to a short collision length in the production of Lambda^*, which justifies the high sticking mechanism of Lambda^* and the participating proton into K^-pp.

10 pages, 12 figures

References in corpus (13)

• Effective Kbar N interaction based on chiral SU(3) dynamics
• Variational calculation of the ppK^- system based on chiral SU(3) dynamics
• Indication of a deeply bound compact K-pp state formed in the pp -> p Lambda K+ reaction at 2.85 GeV
• The basic K nuclear cluster K- pp and its enhanced formation in the p + p -> K+ + X reaction
• Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)
• Lineshape of the Lambda(1405) Hyperon Measured Through its Sigma0 pion0 Decay
• Kaonic production of Lambda(1405) off deuteron target in chiral dynamics
• Baryonic resonances close to the Kbar-N threshold: the case of Lambda(1405) in pp collisions
• Baryonic resonances close to the Kbar-N threshold: the case of Sigma(1385)^+ in pp collisions
• Precise calculation of the two-step process for K- d -> pi Sigma N in the Lambda (1405) resonance region
• The role of the $\Lambda (1405)$ in the $pp\to p{K}^{+}\Lambda (1405)$ reaction
• Formation of the $S=-1$ resonance X(2265) in the reaction $pp->X+K^{+}$ at 2.50 and 2.85 GeV
• Kaonic Nuclear Systems KbarN and KbarNN as Decaying States

Cited by in corpus (10)

• Lattice QCD Evidence that the Lambda(1405) Resonance is an Antikaon-Nucleon Molecule
• Review of the $\mathbf{\Lambda }$(1405): A curious case of a strange-ness resonance
• pK+Λfinal state: towards the extraction of the ppK- contribution
• Pole position of $\Lambda (1405)$ measured in $d(K^{-},n)\pi \Sigma$ reactions
• Investigation of the Lambda(1405) line shape observed in pp collisions
• Measurement of the ${\Lambda }_b^0\to \Lambda (1520){\mu }^{+}{\mu }^{-}$ differential branching fraction
• Pole trajectories of the $\Lambda (1405)$ helps establish its dynamical nature
• The Lambda(1405) state in a chiral unitary approach with off-shell corrections to dimensional regularized loop functions
• Deduction of $M(Sigmapi)$ for $Lambda(1405)$ with mixed $T_{Sigmapileftarrow{K}^{-}p}and{T}_{SigmapileftarrowSigmapi}$ from Hemingway's data
• The $\Lambda (1405)$ resonance as a genuine three-quark or molecular state