Resonance Production and $\pi \pi$ S-wave in ${\pi }^{-}+p\to {\pi }^{-}{\pi }^{-}{\pi }^{+}+p_{recoil}$ at 190 GeV/c

Abstract

The COMPASS collaboration has collected the currently largest data set on diffractively produced ${\pi }^{-}{\pi }^{-}{\pi }^{+}$ final states using a negative pion beam of 190 GeV/c momentum impinging on a stationary proton target. This data set allows for a systematic partial-wave analysis in 100 bins of three-pion mass, $0.5<m_{3\pi }<2.5$ GeV/c${}^2$ , and in 11 bins of the reduced four-momentum transfer squared, $0.1<t<1.0$ (GeV/c)${}^2$ . This two-dimensional analysis offers sensitivity to genuine one-step resonance production, i.e. the production of a state followed by its decay, as well as to more complex dynamical effects in nonresonant $3\pi$ production. In this paper, we present detailed studies on selected $3\pi$ partial waves with $J^{PC}=0^{-+}$, $1^{++}$, $2^{-+}$, $2^{++}$, and $4^{++}$. In these waves, we observe the well-known ground-state mesons as well as a new narrow axial-vector meson $a_1(1420)$ decaying into $f_0(980)\pi$. In addition, we present the results of a novel method to extract the amplitude of the ${\pi }^{-}{\pi }^{+}$ subsystem with $I^G{J}^{PC}=0^{+}{0}^{++}$ in various partial waves from the ${\pi }^{-}{\pi }^{-}{\pi }^{+}$ data. Evidence is found for correlation of the $f_0(980)$ and $f_0(1500)$ appearing as intermediate ${\pi }^{-}{\pi }^{+}$ isobars in the decay of the known $\pi (1800)$ and ${\pi }_2(1880)$.

arXiv comment96 pages

References in corpus (24)

• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• QCD and strongly coupled gauge theories: challenges and perspectives
• The COMPASS Experiment at CERN
• Resonances in $J/\psi \to \varphi {\pi }^{+}{\pi }^{-}$ and $\varphi K^{+}{K}^{-}$
• Higher Quarkonia
• The Status of Glueballs
• The Production and Decay of Hybrid Mesons by Flux-Tube Breaking
• Hybrid Mesons
• The Experimental Status of Glueballs
• Hybrid Meson Decay Phenomenology
• Observation of a J^PC = 1-+ exotic resonance in diffractive dissociation of 190 GeV/c pi- into pi- pi- pi+
• Model Independent Measurement of \swave $K^{-}{\pi }^{+}$ systems using $\Dp\to Kππ$ Decays from Fermilab E791
• The COMPASS Setup for Physics with Hadron Beams
• Odd and Even Partial Waves of $\eta {\pi }^{-}$ and ${\eta }^{\prime }{\pi }^{-}$ in ${\pi }^{-}p\to {\eta }^{(\prime )}{\pi }^{-}p$ at $191\text{GeV}/c$
• Observation of a new narrow axial-vector meson $a_1(1420)$
• The Status of Exotic-quantum-number Mesons
• Dalitz Plot Analysis of D_s+ -> pi+ pi- pi+
• A search for J^{PC}=1^{-+} exotic mesons in the pi- pi- pi+ and pi- pi0 pi0 systems
• A partial wave analysis of the ${\pi }^{-}{\pi }^{-}{\pi }^{+}$ and ${\pi }^{-}{\pi }^0{\pi }^0$ systems and the search for a $J^{PC}=1^{-+}$ meson
• Covariant Helicity-Coupling Amplitudes: A New Formulation
• Measurement of radiative widths of $a_2(1320)$ and ${\pi }_2(1670)$
• On the Partial-Wave Analysis of Mesonic Resonances Decaying to Multiparticle Final States Produced by Polarized Photons
• Diffractive Dissociation into π- π- π+ Final States at COMPASS
• Study of reaction pi- A --> pi+pi-pi- A at VES setup

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• 50 Years of Quantum Chromodynamics
• On the transition form factors of the axial-vector resonance $f_1(1285)$ and its decay into $e^{+}{e}^{-}$
• Light isovector resonances in ${\pi }^{-}p\to {\pi }^{-}{\pi }^{-}{\pi }^{+}p$ at 190 GeV/$c$
• Radiative resonance couplings in $\gamma \pi \to \pi \pi$
• Light-Meson Spectroscopy with COMPASS
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• Effective-field theory analysis of the ${\tau }^{-}\to {\pi }^{-}{\pi }^0{\nu }_{\tau }$ decays
• Axial-vector transition form factors and $e^{+}{e}^{-}\to f_1{\pi }^{+}{\pi }^{-}$
• Pole position of the $a_1(1260)$ resonance in a three-body unitary framework
• Pole position of the $a_1(1260)$ from $\tau$-decay
• Triangle Singularity as the Origin of the $a_1(1420)$
• Dalitz plots and lineshape of $a_1(1260)$ from a relativistic three-body unitary approach
• Effective-field theory analysis of the ${\tau }^{-}\to {\eta }^{(\prime )}{\pi }^{-}{\nu }_{\tau }$ decays
• Resonances in QCD
• What can we learn about light-meson interactions at electron-positron colliders?
• The exotic meson ${\pi }_1(1600)$ with $J^{PC}=1^{-+}$ and its decay into $\rho (770)\pi$
• Width effects of broad new resonances in loop observables and application to $(g-2{)}_{\mu }$
• Exclusive tensor meson photoproduction
• Resolving ambiguities in model-independent partial-wave analysis of three-body decay
• Khuri-Treiman equations for $3\pi$ decays of particles with spin
• New analysis of $\eta \pi$ tensor resonances measured at the COMPASS experiment
• Strange Hadron Spectroscopy with Secondary KL Beam in Hall D
• Bound states in the B-matrix formalism for the three-body scattering
• The f0(1370) controversy from dispersive meson-meson scattering data analyses
• The semileptonic decays ${\eta }^{(\prime )}\to {\pi }^0{\ell }^{+}{\ell }^{-}$ and ${\eta }^{\prime }\to \eta {\ell }^{+}{\ell }^{-}$ in the standard model
• Amplitude analysis of resonant production in three pions
• Role of $\rho -\omega$ interference in semileptonic $B\to {\pi }^{+}{\pi }^{-}\ell {\bar{\nu }}_{\ell }$ decays
• $\tau \to {\nu }_{\tau }{\rho }^0{\pi }^{-}$ decay in the Nambu - Jona-Lasinio model
• Flow Annealed Importance Sampling Bootstrap meets Differentiable Particle Physics
• Meson Spectroscopy at COMPASS
• Freed-Isobar Analysis of Light Mesons at COMPASS
• Emergence of the $\pi (1300)$ Resonance from Lattice QCD
• Dispersive determination of resonances from $\pi \pi$ scattering data
• Recent Results on Spectroscopy from COMPASS
• New developments in model-independent Partial-Wave Analysis
• Extraction of the ${\pi }^{+}{\pi }^{-}$ Subsystem in Diffractively Produced ${\pi }^{-}{\pi }^{+}{\pi }^{-}$ at COMPASS
• The $2\pi$ Subsystem in Diffractively Produced ${\pi }^{-}{\pi }^{+}{\pi }^{-}$ at COMPASS
• Hadronic Currents and Form Factors in three-body Semileptonic $\tau$ Decays
• Light-Quark Resonances at COMPASS