Search for the Cryptoexotic Member of the Baryon Antidecuplet 1/2+ in the Reactions pi- p --> pi- p and pi- p --> K L

TL;DR

This paper proposes a method to search for a narrow cryptoexotic nucleon resonance in pi- p reactions by scanning the invariant mass with high precision, aiming to detect new baryon states in the 1610-1770 MeV range.

Contribution

It introduces a high-precision scanning technique for identifying cryptoexotic baryon resonances in pi- p interactions, with detailed experimental setup and sensitivity analysis.

Findings

High sensitivity to the targeted resonance is demonstrated.

The method allows invariant mass measurement with better than 1 MeV accuracy.

A detailed experimental plan with estimated budget and timeline is provided.

Abstract

The main goal of this proposal is the search for a narrow cryptoexotic nucleon resonance by scanning of the pi- p system invariant mass in the region (1610-1770) MeV with the detection of pi- p and K Lambda decays. The scan is supposed to be done by the variation of the incident pi- momentum and its measurement with the accuracy of up to +-0.1% (better than 1 MeV in terms of the invariant mass in the whole energy range) with a set of proportional chambers located in the first focus of the magnetooptical channel. High sensitivity of the method to the resonance under search is shown. The secondary particles scattered from a liquid hydrogen target are detected by sets of the wire drift chambers equipped with modern electronics. The time scale of the project is about 3 years. The budget estimate including manpower, the apparatus and operation cost, is about 40 million rubles. The beam time required is (4-6) two week runs on "high" (10 GeV/c) flattop of the ITEP proton synchrotron.