A. Pyszniak

activity

20112020

most citedEvidence for a New Resonance from Polarized Neutron-Proton Scattering

179 citations · 979 across the 23 of their papers we have counts for

collaborators

24 papers

hep-ex2020★ 7 cited

Differential Cross Sections for Neutron-Proton Scattering in the Region of the $d^{*} (2380)$ Dibaryon Resonance

P. Adlarson, W. Augustyniak, W. Bardan +102

Differential cross sections have been extracted from exclusive and kinematically complete high-statistics measurements of quasifree polarized $n p$ scattering performed in the…

nucl-ex2018★ 1 cited

Backward single-pion production in the $pd \to^{3} He π^{0}$ reaction with WASA-at-COSY

P. Adlarson, W. Augustyniak, W. Bardan +89

New data on the production of single neutral pions in the $p d \to^{3} He π^{0}$ reaction are presented. For fifteen proton beam momenta between $p_p=1.60\;\textrm{GeV…

hep-ex2018★ 9 cited

Search for $C$ violation in the decay $η \to π^{0} + e^{+} + e^{-}$ with WASA-at-COSY

P. Adlarson, W. Augustyniak, W. Bardan +90

We report on the investigation of the rare decay $η \to π^{0} + e^{+} + e^{-}$ which is of interest to study both $C$ violation in the electromagnetic interaction and to…

nucl-ex2018★ 11 cited

Total and differential cross sections of $η$ -production in proton-deuteron fusion for excess energies between $Q_{η} = 13 MeV$ and $Q_{η} = 81 MeV$

P. Adlarson, W. Augustyniak, W. Bardan +90

New data on both total and differential cross sections of the production of $η$ mesons in proton-deuteron fusion to $^{3} He η$ in the excess energy region $13.6\;\text{MeV}…

nucl-ex2017★ 2 cited

Spin dependence of η meson production in proton-proton collisions close to threshold

P. Adlarson, W. Augustyniak, W. Bardan +88

Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high degree of the polarized proton beam of COSY, the reaction pp{\to} ppη has been…

nucl-ex2017★ 3 cited

Importance of d-wave contributions in the charge symmetry breaking reaction $dd \to^{4} He π^{0}$

P. Adlarson, W. Augustyniak, W. Bardan +89

This letter reports a first quantitative analysis of the contribution of higher partial waves in the charge symmetry breaking reaction $dd \to^{4} He π^{0}$ using the WASA-at-C…

nucl-ex2016★ 37 cited

Search for eta-mesic 4He in the dd->3He n pi0 and dd->3He p pi- reactions with the WASA-at-COSY facility

P. Adlarson, W. Augustyniak, W. Bardan +90

The search for 4He-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd->3He n pi0 and dd->3He p pi- processes. T…

nucl-ex2016★ 20 cited

Measurement of the $ω \to π^{+} π^{-} π^{0}$ Dalitz plot distribution

COSY Collaboration, P. Adlarson, W. Augustyniak +93

Using the production reactions $pd\to {}^3\mbox{He}\,ω$ and $pp \to pp ω$ , the Dalitz plot distribution for the $ω \to π^{+} π^{-} π^{0}$ decay is studied with the WASA detector at COSY, ba…

nucl-ex2016★ 32 cited

Feasibility study for the measurement of $π N$ TDAs at PANDA in $p ˉ p \to J / ψ π^{0}$

PANDA Collaboration, B. Singh, W. Erni +508

The exclusive charmonium production process in $p ˉ p$ annihilation with an associated $π^{0}$ meson $p ˉ p \to J / ψ π^{0}$ is studied in the framework of QCD collinear factorizatio…

nucl-ex2016★ 17 cited

Search for an Isospin I =3 Dibaryon

P. Adlarson, W. Augustyniak, W. Bardan +91

Various theoretical calculations based on QCD or hadronic interactions predict that in addition to the recently observed dibaryon resonance $d^{*} (2380)$ with $I (J^{P}) = 0 (3^{+})$ there…

nucl-ex2015★ 18 cited

Measurements of Branching Ratios for $η$ Decays into Charged Particles

P. Adlarson, W. Augustyniak, W. Bardan +96

The WASA-at-COSY experiment has collected $3 \times 1 0^{7}$ events with $η$ -mesons produced via the reaction $p d \to^{3} He η$ at $T = 1.0 GeV$ . Usi…

nucl-ex2014★ 76 cited

Measurement of the $n p \to n p π^{0} π^{0}$ Reaction in Search for the Recently Observed $d^{*} (2380)$ Resonance

P. Adlarson, W. Augustyniak, W. Bardan +99

Exclusive measurements of the quasi-free $n p \to n p π^{0} π^{0}$ reaction have been performed by means of $d p$ collisions at $T_{d}$ = 2.27 GeV using the WASA detector setup at COSY. Total…

nucl-ex2014★ 77 cited

Neutron-Proton Scattering in the Context of the $d^{*}$ (2380) Resonance

P. Adlarson, W. Augustyniak, W. Bardan +105

New data on quasifree polarized neutron-proton scattering, in the region of the recently observed $d^{*}$ resonance structure, have been obtained by exclusive and kinematically compl…

nucl-ex2014★ 9 cited

Charge Symmetry Breaking in dd->4Heπ0 with WASA-at-COSY

COSY Collaboration, P. Adlarson, W. Augustyniak +102

Charge symmetry breaking (CSB) observables are a suitable experimental tool to examine effects induced by quark masses on the nuclear level. Previous high precision data from TRIUM…

hep-ex2014★ 29 cited

Measurement of the $η \to π^{+} π^{-} π^{0}$ Dalitz plot distribution

P. Adlarson, W. Augustyniak, W. Bardan +107

Dalitz plot distribution of the $η \to π^{+} π^{-} π^{0}$ decay is determined using a data sample of $1.2 \cdot 1 0^{7}$ $η$ mesons from $p d \to^{3} He η$ reaction at 1 GeV collected by the…

nucl-ex2014★ 179 cited

Evidence for a New Resonance from Polarized Neutron-Proton Scattering

P. Adlarson, W. Augustyniak, W. Bardan +104

Exclusive and kinematically complete high-statistics measurements of quasifree polarized $n p$ scattering have been performed in the energy region of the narrow resonance stru…

nucl-ex2014★ 14 cited

Cross section ratio and angular distributions of the reaction p + d -> 3He + eta at 48.8 MeV and 59.8 MeV excess energy

P. Adlarson, W. Augustyniak, W. Bardan +104

We present new data for angular distributions and on the cross section ratio of the p + d -> 3He + eta reaction at excess energies of Q = 48.8 MeV and Q = 59.8 MeV. The data have b…

nucl-ex2013★ 78 cited

Measurement of the $p n \to pp π^{0} π^{-}$ Reaction in Search for the Recently Observed Resonance Structure in $d π^{0} π^{0}$ and $d π^{+} π^{-}$ systems

P. Adlarson, W. Augustyniak, W. Bardan +110

Exclusive measurements of the quasi-free $p n \to pp π^{0} π^{-}$ reaction have been performed by means of $p d$ collisions at $T_{p}$ = 1.2 GeV using the WASA detector setup at COSY. Total…

nucl-ex2013★ 6 cited

Investigation of the dd -> 3He n π0 reaction with the FZ Jülich WASA-at-COSY facility

COSY Collaboration, P. Adlarson, W. Augustyniak +112

An exclusive measurement of the dd -> 3He n π0 reaction was carried at a beam momentum of p = 1.2 GeV/c using the WASA-at-COSY facility. For the first time data on the total cross…

hep-ex2013★ 125 cited

Search for a dark photon in the $π^{0} \to e^{+} e^{-} γ$ decay

COSY Collaboration, P. Adlarson, W. Augustyniak +113

The presently world largest data sample of pi0 --> gamma e+e- decays containing nearly 5E5 events was collected using the WASA detector at COSY. A search for a dark photon U produc…

nucl-ex2013★ 59 cited

Search for the eta-mesic 4He with WASA-at-COSY detector

P. Adlarson, W. Augustyniak, W. Bardan +111

An exclusive measurement of the excitation function for the dd->3Heppi- reaction was performed at the Cooler Synchrotron COSY-Juelich with the WASA-at-COSY detection system. The da…

nucl-ex2012★ 128 cited

Isospin Decomposition of the Basic Double-Pionic Fusion in the Region of the ABC Effect

P. Adlarson, W. Augustyniak, W. Bardan +111

Exclusive and kinematically complete high-statistics measurements of the basic double pionic fusion reactions pn -> dpi0pi0, pn -> d pi+pi- and pp -> dpi+pi0 have been carried out…

nucl-ex2012

Search for eta-mesic 4He with the WASA-at-COSY detector

Wojciech Krzemien

We performed a search for the 4He-eta bound state via exclusive measurement of the excitation function for the dd->3Heppi- reaction, where the outgoing p-pi- pair originates from t…

nucl-ex2011★ 42 cited

Exclusive Measurement of the eta --> pi+ pi- gamma Decay

P. Adlarson, C. Adolph, W. Augustyniak +119

An exclusive measurement of the decay eta --> pi+ pi- gamma has been performed at the WASA facility at COSY. The eta mesons were produced in the fusion reaction pd --> 3He X at a p…

Differential Cross Sections for Neutron-Proton Scattering in the Region of the d∗(2380) Dibaryon Resonance

Backward single-pion production in the pd→3Heπ0 reaction with WASA-at-COSY

Search for C violation in the decay η→π0+e++e− with WASA-at-COSY

Total and differential cross sections of η-production in proton-deuteron fusion for excess energies between Qη​=13MeV and Qη​=81MeV

Spin dependence of η meson production in proton-proton collisions close to threshold

Importance of d-wave contributions in the charge symmetry breaking reaction dd→4Heπ0

Search for eta-mesic 4He in the dd->3He n pi0 and dd->3He p pi- reactions with the WASA-at-COSY facility

Measurement of the ω→π+π−π0 Dalitz plot distribution

Feasibility study for the measurement of πN TDAs at PANDA in pˉ​p→J/ψπ0

Search for an Isospin I =3 Dibaryon

Measurements of Branching Ratios for η Decays into Charged Particles

Measurement of the np→npπ0π0 Reaction in Search for the Recently Observed d∗(2380) Resonance

Neutron-Proton Scattering in the Context of the d∗(2380) Resonance

Charge Symmetry Breaking in dd->4Heπ0 with WASA-at-COSY

Measurement of the η→π+π−π0 Dalitz plot distribution

Evidence for a New Resonance from Polarized Neutron-Proton Scattering

Cross section ratio and angular distributions of the reaction p + d -> 3He + eta at 48.8 MeV and 59.8 MeV excess energy

Measurement of the pn→ppπ0π− Reaction in Search for the Recently Observed Resonance Structure in dπ0π0 and dπ+π− systems

Investigation of the dd -> 3He n π0 reaction with the FZ Jülich WASA-at-COSY facility

Search for a dark photon in the π0→e+e−γ decay

Search for the eta-mesic 4He with WASA-at-COSY detector

Isospin Decomposition of the Basic Double-Pionic Fusion in the Region of the ABC Effect

Search for eta-mesic 4He with the WASA-at-COSY detector

Exclusive Measurement of the eta --> pi+ pi- gamma Decay

Differential Cross Sections for Neutron-Proton Scattering in the Region of the $d^{*} (2380)$ Dibaryon Resonance

Backward single-pion production in the $pd \to^{3} He π^{0}$ reaction with WASA-at-COSY

Search for $C$ violation in the decay $η \to π^{0} + e^{+} + e^{-}$ with WASA-at-COSY

Total and differential cross sections of $η$ -production in proton-deuteron fusion for excess energies between $Q_{η} = 13 MeV$ and $Q_{η} = 81 MeV$

Importance of d-wave contributions in the charge symmetry breaking reaction $dd \to^{4} He π^{0}$

Measurement of the $ω \to π^{+} π^{-} π^{0}$ Dalitz plot distribution

Feasibility study for the measurement of $π N$ TDAs at PANDA in $p ˉ p \to J / ψ π^{0}$

Measurements of Branching Ratios for $η$ Decays into Charged Particles

Measurement of the $n p \to n p π^{0} π^{0}$ Reaction in Search for the Recently Observed $d^{*} (2380)$ Resonance

Neutron-Proton Scattering in the Context of the $d^{*}$ (2380) Resonance

Measurement of the $η \to π^{+} π^{-} π^{0}$ Dalitz plot distribution

Measurement of the $p n \to pp π^{0} π^{-}$ Reaction in Search for the Recently Observed Resonance Structure in $d π^{0} π^{0}$ and $d π^{+} π^{-}$ systems

Search for a dark photon in the $π^{0} \to e^{+} e^{-} γ$ decay