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Resonance production and decays in nucleon-nucleon collisions with HADES

2018
book
monography
Publisher
Uniwersytet Jagielloński w Krakowie
80
Author
Przygoda Witold
Publication place
Kraków : Jagiellonian University
Pages
[4], VI, 202
ISBN
978-83-60391-99-0
Keywords in Polish

rezonanse barionowe

mezony

rozpady barionów

rozpady mezonów

rozpad Dalitza

modele rezonansowe

analiza fal parcjalnych

algorytmy identyfikacji sygnału

Keywords in English

baryon resonances

mesons

baryon decays

meson decays

Dalitz decay

resonance model

partial wave analysis

algorithms of signal identification

Remarks

Bibliogr. s. 181-202

Language
English
Abstract in English

The High Acceptance Di-Electron Spectrometer (HADES), installed at GSI, allows to study both hadron and rare dilepton production in a fixed target experiments in the beam energy range of a few GeV per nucleon, reaching up to 4.5 GeV for a proton beam and 1.5 GeV/nucleon for a heavy-ion beam. The present interpretation of dilepton spectra measured in heavy-ion reactions at various energies is based on hadronic models. They predict in-medium modifications of the −meson spectral function due to its coupling to resonance-hole states. In the energy range of the HADES experiments, the −meson can be produced in primary NN or secondary N collisions. The measurement of a dielectron emission in elementary reactions opens the possibility to constrain the interpretation of medium effects and better understand the relation between the couplings of the baryonic resonances to the −meson. The Dalitz decay of baryonic resonances gives access to the electromagnetic structure of baryonic transitions in a timelike region at small positive values of the squared fourmomentum transferred, where couplings to light vector mesons are expected. In this monograph the systematic studies of resonance excitation and decays, measured in NN collisions with the increasing energy, are presented. First, the pp collisions at 1.25 GeV allowed to measure exclusive channels with one-pion in the final state. They were put to extended studies based on various observables in one-pion exchange models and with solutions obtained within the framework of a partial wave analysis (PWA) of the Bonn-Gatchina group. The obtained (1232) production cross section was further used for the first experimental extraction of the Dalitz decay and compared to the models of the electromagnetic transition form factors. The branching ratio of this decay, achieved in the exclusive channel, has been included in the 2018 Review of Particle Physics. In quasi-free np collisions at 1.25 GeV, two-pion production was studied to conclude on double−, N(1440), and (1600) excitation with the aim of studying the production of the −meson in the isospin I = 1 channel. In addition, this analysis provided an independent verification of the existence of the (2370) resonance observed by the WASA Collaboration. Furthermore, a strong excess of the dielectron yield, in comparison to the pp reaction at 1.25 GeV, was observed in the inclusive channel. This reaction is well suited for studies of the np bremsstrahlung with strong isospin effects effects predicted by one-boson-exchange models. The excess was confirmed also in the exclusive channel and the data were compared with the models explaining the enhancement at large invariant masses due to the off-shell −meson production. The exclusive hadronic channels with one-pion and rho−meson were identified in pp collisions at 2.2 GeV. The and eta exclusive production cross sections were extracted and compared to the predictions of a resonance model. Further, the analysis of the exclusive channel allowed for the reconstruction of and Dalitz decays. The angular distributions of in the rest frame were determined to be in agreement with the QED prediction for pseudoscalar mesons. In the pp collisions measured at energy T = 3.5 GeV, a peak corresponding to direct decays, with 2% mass resolution, was reconstructed. The inclusive production cross sections for and mesons were determined from dielectron experimental data for the first time at this energy. In addition, the upper bound for the direct decay was defined. The exclusive one pion production and and dielectron channels were used to extract the and resonance production cross sections. The emission from baryonic decays was identified with the dielectron invariant mass distribution strongly modified by the intermediate rho−meson. This observation has been interpreted within the Vector Dominance Model of the resonance electromagnetic transition form factor. Comparison with various transport models (PYTHIA, GiBUU/SMASH, HSD, UrQMD) unraveled the ambiguities of the model descriptions and the important role of the intermediate rho production. To tackle this problem a systematic investigation focused on the role of N(1520) production and decay in pion-induced reactions was started. Data at four different pion beam momenta (656, 690, 748 and 800 MeV/c) were collected in collisions. In the outlook, exclusive channels with one pion , two pions and dileptons in the final state were discussed, with a special interest for the rhoN channel, since it has a direct impact on the in-medium distortions of the −meson spectral function. Pion beam experiments will be continued in GSI in the next years, then the HADES experimental program will be pursued using the proton and ion beams at FAIR. This monograph has been extended by Appendices covering details on dielectron production channels as well as the models of the electromagnetic transition form factors for baryon resonance Dalitz decays. The HADES spectrometer and the analysis strategy were described, too. The author hopes that this book will serve not only as a report on the scientific achievements but also as a source of information on resonance production and decays in nucleon-nucleon collisions at energies of a few GeV.

Affiliation
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
dc.abstract.enThe High Acceptance Di-Electron Spectrometer (HADES), installed at GSI, allows to study both hadron and rare dilepton production in a fixed target experiments in the beam energy range of a few GeV per nucleon, reaching up to 4.5 GeV for a proton beam and 1.5 GeV/nucleon for a heavy-ion beam. The present interpretation of dilepton spectra measured in heavy-ion reactions at various energies is based on hadronic models. They predict in-medium modifications of the $\rho$−meson spectral function due to its coupling to resonance-hole states. In the energy range of the HADES experiments, the $\rho$−meson can be produced in primary NN or secondary $\pi$ N collisions. The measurement of a dielectron emission in elementary reactions opens the possibility to constrain the interpretation of medium effects and better understand the relation between the couplings of the baryonic resonances to the $\rho$−meson. The Dalitz decay of baryonic resonances $(R \rightarrow Ne^{+}e^{-})$ gives access to the electromagnetic structure of baryonic transitions in a timelike region at small positive values of the squared fourmomentum transferred, where couplings to light vector $\rho /\omega$ mesons are expected. In this monograph the systematic studies of resonance excitation and decays, measured in NN collisions with the increasing energy, are presented. First, the pp collisions at 1.25 GeV allowed to measure exclusive channels with one-pion in the final state. They were put to extended studies based on various observables in one-pion exchange models and with solutions obtained within the framework of a partial wave analysis (PWA) of the Bonn-Gatchina group. The obtained $\Delta$ (1232) production cross section was further used for the first experimental extraction of the $\Delta$ Dalitz decay and compared to the models of the electromagnetic transition form factors. The branching ratio of this decay, achieved in the exclusive $pp \rightarrow ppe^{+}e^{-}$ channel, has been included in the 2018 Review of Particle Physics. In quasi-free np collisions at 1.25 GeV, two-pion production was studied to conclude on double−$\Delta$, N(1440), and $\Delta$ (1600) excitation with the aim of studying the production of the $\rho$−meson in the isospin I = 1 channel. In addition, this analysis provided an independent verification of the existence of the $d^{\ast }$(2370) resonance observed by the WASA Collaboration. Furthermore, a strong excess of the dielectron yield, in comparison to the pp reaction at 1.25 GeV, was observed in the $e^{+}e^{-}$ inclusive channel. This reaction is well suited for studies of the np bremsstrahlung with strong isospin effects effects predicted by one-boson-exchange models. The excess was confirmed also in the $e^{+}e^{-}$ exclusive channel and the data were compared with the models explaining the enhancement at large invariant masses due to the off-shell $\rho$−meson production. The exclusive hadronic channels with one-pion and rho−meson were identified in pp collisions at 2.2 GeV. The $\pi ^{0}$ and eta exclusive production cross sections were extracted and compared to the predictions of a resonance model. Further, the analysis of the $ppe^{+}e^{-}$ exclusive channel allowed for the reconstruction of $\pi ^{0}$ and $\eta$ Dalitz decays. The angular distributions of $e^{+} or e^{−}$ in the $\gamma^{\ast }$ rest frame were determined to be in agreement with the QED prediction for pseudoscalar mesons. In the pp collisions measured at energy T = 3.5 GeV, a peak corresponding to direct $\omega$ decays, with 2% mass resolution, was reconstructed. The inclusive production cross sections for $\omega$ and $\rho$ mesons were determined from dielectron experimental data for the first time at this energy. In addition, the upper bound for the direct $\eta \rightarrow e^{+}e^{-}$ decay was defined. The exclusive one pion production $(pp \rightarrow pp\pi ^{0}$ and $pp \rightarrow np\pi ^{+})$ and dielectron $(pp \rightarrow ppe^{+}e^{-})$ channels were used to extract the $N^{\ast }$ and $\Delta$ resonance production cross sections. The $e^{+}e^{-}$ emission from baryonic decays was identified with the dielectron invariant mass distribution strongly modified by the intermediate rho−meson. This observation has been interpreted within the Vector Dominance Model of the resonance electromagnetic transition form factor. Comparison with various transport models (PYTHIA, GiBUU/SMASH, HSD, UrQMD) unraveled the ambiguities of the model descriptions and the important role of the intermediate rho production. To tackle this problem a systematic investigation focused on the role of N(1520) production and decay in pion-induced reactions was started. Data at four different pion beam momenta (656, 690, 748 and 800 MeV/c) were collected in $\pi ^{−}p$ collisions. In the outlook, exclusive channels with one pion $(\pi ^{−} p)$, two pions $(n\pi ^{+} \pi ^{−})$ and dileptons $(ne^{+} e^{−})$ in the final state were discussed, with a special interest for the rhoN channel, since it has a direct impact on the in-medium distortions of the $\rho$−meson spectral function. Pion beam experiments will be continued in GSI in the next years, then the HADES experimental program will be pursued using the proton and ion beams at FAIR. This monograph has been extended by Appendices covering details on dielectron production channels as well as the models of the electromagnetic transition form factors for baryon resonance Dalitz decays. The HADES spectrometer and the analysis strategy were described, too. The author hopes that this book will serve not only as a report on the scientific achievements but also as a source of information on resonance production and decays in nucleon-nucleon collisions at energies of a few GeV.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiegopl
dc.contributor.authorPrzygoda, Witold - 100454 pl
dc.date.accessioned2018-05-11T13:18:07Z
dc.date.available2018-05-11T13:18:07Z
dc.date.issued2018pl
dc.date.openaccess0
dc.description.accesstimeprzed opublikowaniem
dc.description.additionalBibliogr. s. 181-202pl
dc.description.physical[4], VI, 202pl
dc.description.publication14pl
dc.description.versionostateczna wersja wydawcy
dc.identifier.isbn978-83-60391-99-0pl
dc.identifier.urihttps://ruj.uj.edu.pl/xmlui/handle/item/54251
dc.languageengpl
dc.participationPrzygoda, Witold: 100%;pl
dc.pubinfoKraków : Jagiellonian Universitypl
dc.publisher.ministerialUniwersytet Jagielloński w Krakowiepl
dc.rightsUdzielam licencji. Uznanie autorstwa 3.0 Polska*
dc.rights.licenceCC-BY
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/pl/legalcode*
dc.share.typeotwarte repozytorium
dc.subject.enbaryon resonancespl
dc.subject.enmesonspl
dc.subject.enbaryon decayspl
dc.subject.enmeson decayspl
dc.subject.enDalitz decaypl
dc.subject.enresonance modelpl
dc.subject.enpartial wave analysispl
dc.subject.enalgorithms of signal identificationpl
dc.subject.plrezonanse barionowepl
dc.subject.plmezonypl
dc.subject.plrozpady barionówpl
dc.subject.plrozpady mezonówpl
dc.subject.plrozpad Dalitzapl
dc.subject.plmodele rezonansowepl
dc.subject.planaliza fal parcjalnychpl
dc.subject.plalgorytmy identyfikacji sygnałupl
dc.subtypeMonographypl
dc.titleResonance production and decays in nucleon-nucleon collisions with HADESpl
dc.typeBookpl
dspace.entity.typePublication
dc.abstract.enpl
The High Acceptance Di-Electron Spectrometer (HADES), installed at GSI, allows to study both hadron and rare dilepton production in a fixed target experiments in the beam energy range of a few GeV per nucleon, reaching up to 4.5 GeV for a proton beam and 1.5 GeV/nucleon for a heavy-ion beam. The present interpretation of dilepton spectra measured in heavy-ion reactions at various energies is based on hadronic models. They predict in-medium modifications of the $\rho$−meson spectral function due to its coupling to resonance-hole states. In the energy range of the HADES experiments, the $\rho$−meson can be produced in primary NN or secondary $\pi$ N collisions. The measurement of a dielectron emission in elementary reactions opens the possibility to constrain the interpretation of medium effects and better understand the relation between the couplings of the baryonic resonances to the $\rho$−meson. The Dalitz decay of baryonic resonances $(R \rightarrow Ne^{+}e^{-})$ gives access to the electromagnetic structure of baryonic transitions in a timelike region at small positive values of the squared fourmomentum transferred, where couplings to light vector $\rho /\omega$ mesons are expected. In this monograph the systematic studies of resonance excitation and decays, measured in NN collisions with the increasing energy, are presented. First, the pp collisions at 1.25 GeV allowed to measure exclusive channels with one-pion in the final state. They were put to extended studies based on various observables in one-pion exchange models and with solutions obtained within the framework of a partial wave analysis (PWA) of the Bonn-Gatchina group. The obtained $\Delta$ (1232) production cross section was further used for the first experimental extraction of the $\Delta$ Dalitz decay and compared to the models of the electromagnetic transition form factors. The branching ratio of this decay, achieved in the exclusive $pp \rightarrow ppe^{+}e^{-}$ channel, has been included in the 2018 Review of Particle Physics. In quasi-free np collisions at 1.25 GeV, two-pion production was studied to conclude on double−$\Delta$, N(1440), and $\Delta$ (1600) excitation with the aim of studying the production of the $\rho$−meson in the isospin I = 1 channel. In addition, this analysis provided an independent verification of the existence of the $d^{\ast }$(2370) resonance observed by the WASA Collaboration. Furthermore, a strong excess of the dielectron yield, in comparison to the pp reaction at 1.25 GeV, was observed in the $e^{+}e^{-}$ inclusive channel. This reaction is well suited for studies of the np bremsstrahlung with strong isospin effects effects predicted by one-boson-exchange models. The excess was confirmed also in the $e^{+}e^{-}$ exclusive channel and the data were compared with the models explaining the enhancement at large invariant masses due to the off-shell $\rho$−meson production. The exclusive hadronic channels with one-pion and rho−meson were identified in pp collisions at 2.2 GeV. The $\pi ^{0}$ and eta exclusive production cross sections were extracted and compared to the predictions of a resonance model. Further, the analysis of the $ppe^{+}e^{-}$ exclusive channel allowed for the reconstruction of $\pi ^{0}$ and $\eta$ Dalitz decays. The angular distributions of $e^{+} or e^{−}$ in the $\gamma^{\ast }$ rest frame were determined to be in agreement with the QED prediction for pseudoscalar mesons. In the pp collisions measured at energy T = 3.5 GeV, a peak corresponding to direct $\omega$ decays, with 2% mass resolution, was reconstructed. The inclusive production cross sections for $\omega$ and $\rho$ mesons were determined from dielectron experimental data for the first time at this energy. In addition, the upper bound for the direct $\eta \rightarrow e^{+}e^{-}$ decay was defined. The exclusive one pion production $(pp \rightarrow pp\pi ^{0}$ and $pp \rightarrow np\pi ^{+})$ and dielectron $(pp \rightarrow ppe^{+}e^{-})$ channels were used to extract the $N^{\ast }$ and $\Delta$ resonance production cross sections. The $e^{+}e^{-}$ emission from baryonic decays was identified with the dielectron invariant mass distribution strongly modified by the intermediate rho−meson. This observation has been interpreted within the Vector Dominance Model of the resonance electromagnetic transition form factor. Comparison with various transport models (PYTHIA, GiBUU/SMASH, HSD, UrQMD) unraveled the ambiguities of the model descriptions and the important role of the intermediate rho production. To tackle this problem a systematic investigation focused on the role of N(1520) production and decay in pion-induced reactions was started. Data at four different pion beam momenta (656, 690, 748 and 800 MeV/c) were collected in $\pi ^{−}p$ collisions. In the outlook, exclusive channels with one pion $(\pi ^{−} p)$, two pions $(n\pi ^{+} \pi ^{−})$ and dileptons $(ne^{+} e^{−})$ in the final state were discussed, with a special interest for the rhoN channel, since it has a direct impact on the in-medium distortions of the $\rho$−meson spectral function. Pion beam experiments will be continued in GSI in the next years, then the HADES experimental program will be pursued using the proton and ion beams at FAIR. This monograph has been extended by Appendices covering details on dielectron production channels as well as the models of the electromagnetic transition form factors for baryon resonance Dalitz decays. The HADES spectrometer and the analysis strategy were described, too. The author hopes that this book will serve not only as a report on the scientific achievements but also as a source of information on resonance production and decays in nucleon-nucleon collisions at energies of a few GeV.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
dc.contributor.authorpl
Przygoda, Witold - 100454
dc.date.accessioned
2018-05-11T13:18:07Z
dc.date.available
2018-05-11T13:18:07Z
dc.date.issuedpl
2018
dc.date.openaccess
0
dc.description.accesstime
przed opublikowaniem
dc.description.additionalpl
Bibliogr. s. 181-202
dc.description.physicalpl
[4], VI, 202
dc.description.publicationpl
14
dc.description.version
ostateczna wersja wydawcy
dc.identifier.isbnpl
978-83-60391-99-0
dc.identifier.uri
https://ruj.uj.edu.pl/xmlui/handle/item/54251
dc.languagepl
eng
dc.participationpl
Przygoda, Witold: 100%;
dc.pubinfopl
Kraków : Jagiellonian University
dc.publisher.ministerialpl
Uniwersytet Jagielloński w Krakowie
dc.rights*
Udzielam licencji. Uznanie autorstwa 3.0 Polska
dc.rights.licence
CC-BY
dc.rights.uri*
http://creativecommons.org/licenses/by/3.0/pl/legalcode
dc.share.type
otwarte repozytorium
dc.subject.enpl
baryon resonances
dc.subject.enpl
mesons
dc.subject.enpl
baryon decays
dc.subject.enpl
meson decays
dc.subject.enpl
Dalitz decay
dc.subject.enpl
resonance model
dc.subject.enpl
partial wave analysis
dc.subject.enpl
algorithms of signal identification
dc.subject.plpl
rezonanse barionowe
dc.subject.plpl
mezony
dc.subject.plpl
rozpady barionów
dc.subject.plpl
rozpady mezonów
dc.subject.plpl
rozpad Dalitza
dc.subject.plpl
modele rezonansowe
dc.subject.plpl
analiza fal parcjalnych
dc.subject.plpl
algorytmy identyfikacji sygnału
dc.subtypepl
Monography
dc.titlepl
Resonance production and decays in nucleon-nucleon collisions with HADES
dc.typepl
Book
dspace.entity.type
Publication
Affiliations
Wydział Fizyki, Astronomii i Informatyki Stosowanej
Przygoda, Witold

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