Baryon spectroscopy in (π,2π) reactions with 106Hz pion beams at J-PARC

Hiroyuki Sako, Shoichi Hasegawa, Kenji Hosomi, Yudai Ichikawa, Ken Ichi Imai, Kenneth Hicks, Jung Keun Ahn, Shin Hyung Kim, Jong Won Lee, Sang Hoon Hwang

Research output: Contribution to journalArticle

Abstract

Although baryon resonances (N∗ and Δ∗) have been studied for a long time, our knowledge on their mass spectra and properties are still limited due to their overlapping spectra with large widths. Recently a Dynamical-Couple Channel model shows there are significant contributions of (π, 2π) reactions to high mass baryon resonances. However, there are only 240 thousand events of (π, 2π) reaction data which was mainly measured in 1970's. Thus, we proposed an experiment E45 to study baryon resonances in (π, 2π) reaction utilizing 106 Hz π± beams at J-PARC. We aim at clarifying most of baryon mass levels with (π, 2π) data with the increased statistics by two orders of magnitude. We also search for exotic baryons such as hybrid baryons predicted by lattice QCD calculations. We measure reactions of π- p→ π+π-n, π0π-p and π+p→π0π+p, π+π+n, as well as π-p → K0∧ and π+p→ K+Σ+ in a large acceptance Time Projection Chamber (HypTPC) inside a Helmholtz dipole magnet. We trigger these reactions by requiring two charged particles in the hodoscope counters surrounding HypTPC. HypTPC is placed inside a superconducting Helmholtz type dipole magnet with the magnetic field of 1.5 T We will measure these reactions in small momentum steps over a large beam momentum range and perform partial wave analysis to extract properties of each resonance. In this work, we will show the experimental design, expected results in simulations, and the status of the detectors.

Original languageEnglish
Article number266
JournalProceedings of Science
Volume2016-September
Publication statusPublished - 2016 Jan 1

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pion beams
baryons
baryon resonance
spectroscopy
magnets
dipoles
hodoscopes
momentum
acceptability
mass spectra
charged particles
counters
quantum chromodynamics
actuators
chambers
projection
statistics
detectors
magnetic fields

ASJC Scopus subject areas

  • General

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Sako, H., Hasegawa, S., Hosomi, K., Ichikawa, Y., Imai, K. I., Hicks, K., ... Hwang, S. H. (2016). Baryon spectroscopy in (π,2π) reactions with 106Hz pion beams at J-PARC. Proceedings of Science, 2016-September, [266].

Baryon spectroscopy in (π,2π) reactions with 106Hz pion beams at J-PARC. / Sako, Hiroyuki; Hasegawa, Shoichi; Hosomi, Kenji; Ichikawa, Yudai; Imai, Ken Ichi; Hicks, Kenneth; Ahn, Jung Keun; Kim, Shin Hyung; Lee, Jong Won; Hwang, Sang Hoon.

In: Proceedings of Science, Vol. 2016-September, 266, 01.01.2016.

Research output: Contribution to journalArticle

Sako, H, Hasegawa, S, Hosomi, K, Ichikawa, Y, Imai, KI, Hicks, K, Ahn, JK, Kim, SH, Lee, JW & Hwang, SH 2016, 'Baryon spectroscopy in (π,2π) reactions with 106Hz pion beams at J-PARC', Proceedings of Science, vol. 2016-September, 266.
Sako H, Hasegawa S, Hosomi K, Ichikawa Y, Imai KI, Hicks K et al. Baryon spectroscopy in (π,2π) reactions with 106Hz pion beams at J-PARC. Proceedings of Science. 2016 Jan 1;2016-September. 266.
Sako, Hiroyuki ; Hasegawa, Shoichi ; Hosomi, Kenji ; Ichikawa, Yudai ; Imai, Ken Ichi ; Hicks, Kenneth ; Ahn, Jung Keun ; Kim, Shin Hyung ; Lee, Jong Won ; Hwang, Sang Hoon. / Baryon spectroscopy in (π,2π) reactions with 106Hz pion beams at J-PARC. In: Proceedings of Science. 2016 ; Vol. 2016-September.
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