Austenite memory and variant selection in a novel martensitic welding alloy

The crystallographic orientation relationship between the reverse austenite and corresponding martensite in a new residual-stress-reducing weld metal was predicted, using the general theory of martensitic transformation, and verified experimentally. The theoretical and experimental results of this work also provided an evidence of the likelihood of austenite memory phenomenon

Structure near K−K^-+pp+pp threshold in the in-flight 3^3He(K−,Λp)n(K^-,\Lambda p)n reaction

To search for an S= -1 di-baryonic state which decays to $\Lambda p$, the ${\rm{}^3He}(K^-,\Lambda p)n_{missing}$ reaction was studied at 1.0 GeV/$c$. Unobserved neutrons were kinematically identified from the missing mass $M_X$ of the ${\rm{}^3He}(K^-,\Lambda p)X$ reaction in order to have a large acceptance for the $\Lambda pn$ final state. The observed $\Lambda p n$ events, distributed widely over the kinematically allowed region of the Dalitz plot, establish that the major component comes from a three nucleon absorption process. A concentration of events at a specific neutron kinetic energy was observed in a region of low momentum transfer to the $\Lambda p$. To account for the observed peak structure, the simplest S-wave pole was assumed to exist in the reaction channel, having Breit-Wigner form in energy and with a Gaussian form-factor. A minimum $\chi^2$ method was applied to deduce its mass $M_X\ =$ 2355 $^{+ 6}_{ - 8}$ (stat.) $\pm 12$ (syst.) MeV/c$^2$, and decay-width $\Gamma_X\ =$ 110 $^{+ 19}_{ - 17}$ (stat.) $\pm 27$ (syst.) MeV/c$^2$, respectively. The form factor parameter $Q_X \sim$ 400 MeV/$c$ implies that the range of interaction is about 0.5Comment: 12pages, 8 figure

A search for the K−pp bound state in the 3He(K−in-flight, n) reaction at J-PARC

We have collected the first physics data of an experimental search for the simplest kaonic nuclear bound state, " K − pp", by the 3He( K − n) reaction at J-PARC. We confirmed that our spectrometer system works as designed and observed clear peak structure composed of the quasi-elastic K − " n " → K − n and the charge-exchange K − " p " → ¯ K 0 n reactions in the forward neutron spectrum

Search for the K−ppK^-pp bound state via the in-flight 3He(K−,n)^3He(K^-, n) reaction

In the J-PARC E15 experiment, a K − pp search was performed via the 3 He(K − , n ) reaction at 1.0 GeV/c . A forward-going neutron is detected by a neutron counter with 15 m flight length, and decay particles from K − pp are simultaneously measured by a cylindrical detector system that surrounds a liquid 3 He target system. In March and May, 2013, we carried out the first physics data-taking with 5×109 incident kaons on the 3 He target, and we have obtained a preliminary exclusive analysis result of 3 He(K − , Λp )n reaction

Pole position of Λ(1405)\Lambda(1405) measured in d(K−,n)πΣd(K^-,n)\pi\Sigma reactions

We measured a set of $\pi^\pm\Sigma^\mp$, $\pi^0\Sigma^0$, and $\pi^-\Sigma^0$ invariant mass spectra below and above the $\bar{K}N$ mass threshold in $K^-$-induced reactions on deuteron. We deduced the $S$-wave $\bar{K}N\rightarrow\pi\Sigma$ and $\bar{K}N\rightarrow\bar{K}N$ scattering amplitudes in the isospin 0 channel in the framework of a $\bar{K}N$ and $\pi\Sigma$ coupled channel. We find that a resonance pole corresponding to $\Lambda(1405)$ is located at 1417.7$^{+6.0}_{-7.4}$(fitting errors)$^{+1.1}_{-1.0}$(systematic errors) + $[-26.1^{+6.0}_{-7.9}$(fitting errors)$^{+1.7}_{-2.0}$(systematic errors)]$i$ MeV/$c^2$, closer to the $\bar{K}N$ mass threshold than the value determined by the Particle Data Group.Comment: 8 pages, 5 figure

The Physics of the B Factories

This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C