scholarly journals Recent progress in the partial wave analysis of the diffractively produced π−π+π− final state at Compass

2019 ◽  
Vol 199 ◽  
pp. 02003 ◽  
Author(s):  
Fabian Krinner
Keyword(s):  
Partial Wave ◽  
Pion Production ◽  
Recent Progress ◽  
Large Data ◽  
Partial Wave Analysis ◽  
Wave Analysis ◽  
Final State ◽  
Data Set ◽  
Large Data Set

The Compass spectrometer at CERN has collected a large data set for diffractive three-pion production of 46 × 106 exclusive events. Based on previous conventional Partial-Wave Analyses (PWA), we performed a “freed-isobar PWA” on the same data, removing model assumptions on the dynamic isobar amplitudes for dominating waves. In this analysis, we encountered continuous mathematical ambiguities, which we were able to identify and resolve. This analysis gives an unprecedented insight in the interplay of 2π and 3π dynamics in the process. As an example we show results for a spin-exotic wave $J_{{X^ - }}^{PC} = {1^{ - + }}$ wave.

scholarly journals Partial wave analysis of HADES data for two-pion production in pion-nucleon reactions

2019 ◽  
Vol 199 ◽  
pp. 02001
Author(s):  
I. Ciepał ◽  
W. Przygoda ◽  
A. V. Sarantsev
Keyword(s):  
Partial Wave ◽  
Pion Production ◽  
Meson Production ◽  
Resonance Region ◽  
Partial Wave Analysis ◽  
Wave Analysis ◽  
Final State ◽  
Hades Collaboration ◽  
Pion Nucleon

Pion beams are perfect tools to probe resonance excitations at a fixed energy, thus properties of baryonic resonances and their coupling channels can be studied. The HADES Collaboration performed a systematic scan around the second resonance region at four different pion beam momenta 0.656, 0.69, 0.748 and 0.8 GeV/c in π− p reaction. The role of the N(1520) resonance in conjunction with the intermediate ρ-meson production has been studied in the framework of a partial wave analysis. Preliminary results on exclusive channels with one pion (π− p) and two pions (nπ+π− and pπ−π0) in the final state are presented.

scholarly journals Partial wave analysis of HADES data for two-pion production in pion-nucleon reactions

2019 ◽  
Vol 199 ◽  
pp. 01024
Author(s):  
I. Ciepał ◽  
W. Przygoda ◽  
A. V. Sarantsev
Keyword(s):  
Partial Wave ◽  
Pion Production ◽  
Meson Production ◽  
Resonance Region ◽  
Partial Wave Analysis ◽  
Wave Analysis ◽  
Final State ◽  
Hades Collaboration ◽  
Pion Nucleon

Pion beams are perfect tools to probe resonance excitations at a fixed energy, thus properties of baryonic resonances and their coupling channels can be studied. The HADES Collaboration performed a systematic scan around the second resonance region at four different pion beam momenta 0.656, 0.69, 0.748 and 0.8 GeV/c in π− p reaction. The role of the N(1520) resonance in conjunction with the intermediate ρ-meson production has been studied in the framework of a partial wave analysis. Preliminary results on exclusive channels with one pion (π− p) and two pions (nπ+π− and pπ−π0) in the final state are presented.

scholarly journals Role of Spin in NN → NNπ

2016 ◽  
Vol 40 ◽  
pp. 1660061
Author(s):  
Vadim Baru
Keyword(s):  
Partial Wave ◽  
Pion Production ◽  
Low Energy ◽  
Partial Wave Analysis ◽  
P Wave ◽  
Wave Analysis ◽  
Theoretical Predictions

The recent measurements of the reactions [Formula: see text] and [Formula: see text] by the ANKE collaboration at COSY are analyzed with the focus on the p-wave pion production amplitudes. These amplitudes are known to provide an important connection between [Formula: see text] and other low-energy few-nucleon reactions. The results of the recent partial wave analysis of the ANKE data are discussed and compared with the theoretical predictions.

scholarly journals Partial wave analysis at BESIII

2014 ◽  
Vol 31 ◽  
pp. 1460306 ◽  
Author(s):  
Beijiang Liu ◽  
Keyword(s):  
Partial Wave ◽  
High Sensitivity ◽  
Partial Wave Analysis ◽  
Wave Analysis ◽  
Data Set ◽  
Hadron Spectroscopy ◽  
Subsequent Investigation ◽  
Decay Properties ◽  
Quantitative Understanding ◽  
The Moment

The BESIII experiment in Beijing takes data in τ-charm domain since 2009. For the moment the world largest samples of J/ψ, ψ(3686), ψ(3770) and ψ(4040) data have been collected. Hadron spectroscopy is a unique way to access QCD, which is one of the most important physics goals of BESIII. Experimental search of new forms of hadrons and subsequent investigation of their properties would provide validation of and valuable input to the quantitative understanding of QCD. The key to success lies in high levels of precision during the measurement and high statistics in the recorded data set complemented with sophisticated analysis methods. Partial wave analysis (PWA) is a powerful tool to study the hadron spectroscopy, that allows one to extract the resonance's spin-parity, mass, width and decay properties with high sensitivity and accuracy. In this poster, we present the working PWA framework of BESIII – GPUPWA and the recent results of PWA of J/ψ → γηη. GPUPWA is a PWA framework for high statistics partial wave analyses harnessing the GPU parallel computing.

scholarly journals Partial Wave Analysis of HADES Data for Two-Pion Production in Pion-Nucleon Reactions

2020 ◽  
Vol 241 ◽  
pp. 03001
Author(s):  
I. Ciepał
Keyword(s):  
Partial Wave ◽  
Meson Production ◽  
Resonance Region ◽  
Partial Wave Analysis ◽  
Wave Analysis ◽  
Final State ◽  
Decay Channels ◽  
Hades Collaboration ◽  
Pion Nucleon

Pion beams are important tools to study features of baryonic resonances and their decay channels because resonances are produced in s-channel at fixed mass equal to √s. In 2014 the HADES collaboration has performed systematic measurements in the second resonance region scanning around the mass of the N*(1520). Pion beams at four momenta (0.654, 0.686, 0.738 and 0.787 GeV/c) impinging on polyethylene and carbon targets have been used. With the use of the multichannel Partial Wave Analysis (PWA) the role of the N*(1520) resonance in conjunction with the intermediate ρ-meson production has been studied. Preliminary results at 0.654 GeV/c on exclusive production of two pions (ηπ+π- and pπ-π0) in the final state are presented.

scholarly journals Partial wave analysis with OpenAcc

2020 ◽  
Vol 245 ◽  
pp. 06040
Author(s):  
Yanjia Xiao ◽  
Xiaobin Ji ◽  
Beijiang Liu ◽  
Xi’an Xiong
Keyword(s):  
Partial Wave ◽  
Large Data ◽  
Partial Wave Analysis ◽  
Large Data Sets ◽  
Software Framework ◽  
Data Sets ◽  
Computational Power ◽  
Wave Analysis ◽  
Code Migration ◽  
And Performance

Partial wave analysis(PWA) is an important tool in hadron physics. Large data sets from the experiments in high precision frontier require high computational power. To utilize GPU cluster and the resource of super computers with various types of accelerator, we implement a software framework for partial wave analysis using OpenAcc, OpenAccPWA. OpenAccPWA provides convenient approaches for exposing parallelism in the code and excellent support for the large amount of existing CPU-based codes of partial wave amplitudes. It can avoid heavy workload of code migration from CPU to GPU. This proceeding will briefly introduce the software framework and performance of OpenAccPWA.

Partial-Wave Analysis of Single-Pion Production Reactions

2007 ◽  
Author(s):  
R. A. Arndt ◽  
W. J. Briscoe ◽  
I. I. Strakovsky ◽  
R. L. Workman
Keyword(s):  
Partial Wave ◽  
Pion Production ◽  
Partial Wave Analysis ◽  
Wave Analysis
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