First exclusive measurements of the K^-pp state - populated in the pp to   K^+ Lambda p reaction at 2.85 GeV

T. Yamazaki; et al

arXiv:0810.5182·nucl-ex·May 13, 2015

First exclusive measurements of the K^-pp state - populated in the pp to K^+ Lambda p reaction at 2.85 GeV

T. Yamazaki, et al

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TL;DR

This study reports the first exclusive measurements of a K^-pp bound state in proton-proton collisions at 2.85 GeV, identifying a structure at 2265 MeV/c2 with a width of 118 MeV, indicating a possible nuclear bound state.

Contribution

The paper provides the first experimental evidence of a K^-pp bound state through exclusive measurements in pp collisions at this energy.

Findings

01

Identified a structure at 2265 MeV/c2 in the K^+ missing-mass spectrum.

02

Measured the width of the structure as 118 MeV.

03

Confirmed the existence of a K^-pp bound state candidate.

Abstract

We have analyzed data of the DISTO experiment on the exclusive pp to K^+ Lambda p process at T_p = 2.85 $G e V t ose a r c h f or a K^{-} pp (= X) n u c l e a r b o u n d s t a t e t o b e f or m e d in t h e ppt o K^{+} + X r e a c t i o n . T h e d e v ia t i o n s p ec t r a o f t h e K^{+} mi ss in g - ma ss M M (K^{+}) an d L amb d a p in v a r ian t - ma ss M (L amb d a - p) w i t h se l ec t i o n o f l a r g e - an g l e p r o t o n e mi ss i o n r e v e a l e d a s t r u c t u r e w i t h M_{X} = 2265 + - 2 M e V / c 2 an d G amm a_{X} = 118 + - 8$ MeV.

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