{"title":"Hamiltonian approach to QCD in Coulomb gauge at finite temperatures","authors":"H. Reinhardt","doi":"10.22323/1.336.0060","DOIUrl":"https://doi.org/10.22323/1.336.0060","url":null,"abstract":"","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"249 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116047359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Korol, M. Achasov, A. Barniakov, K. Beloborodov, A. Berdyugin, A. Bogdanchikov, A. Botov, V. Druzhinin, V. Golubev, L. Kardapoltsev, A. Kharlamov, S. Koshuba, D. Kovrizhin, A. Kupich, R. Litvinov, N. Melnikova, A. Obrazovsky, E. Pakhtusova, K. Pugachev, S. Serednyakov, Z. Silagadze, I. Surin, Y. Usov, A. Vasiljev, V. Zhabin, V. Zhulanov
A.A. Korol∗abc and M.N. Achasovab and A.Yu. Barnyakovab and K.I.Beloborodovab and A.V.Berdyuginab and A.G. Bogdanchikova and A.A.Botova and V.P. Druzhininab and V.B. Golubevab and L.V. Kardapoltsevab and A.G. Kharlamovab and S.V. Koshubaab and L.A. Korneeva and D.P. Kovrizhinab and A.S. Kupichab and R.A. Litvinova and K.A. Martinab and N.A. Melnikovaab and A.E. Obrazovskya and E.V. Pakhtusovaa and K.V. Pugachevab and S.I. Serednyakovab and D.A. Shtola and Z.K. Silagadzeab and I.K. Surina and Yu.V. Usovab and A.V. Vasiljevab and V.N. Zhabinab and V.V. Zhulanovab aBudker Institute of Nuclear Physics, Novosibirsk, Russia bNovosibirsk State University, Novosibirsk, Russia cE-mail: A.A.Korol@inp.nsk.su
{"title":"Recent experimental results from the SND detector","authors":"A. Korol, M. Achasov, A. Barniakov, K. Beloborodov, A. Berdyugin, A. Bogdanchikov, A. Botov, V. Druzhinin, V. Golubev, L. Kardapoltsev, A. Kharlamov, S. Koshuba, D. Kovrizhin, A. Kupich, R. Litvinov, N. Melnikova, A. Obrazovsky, E. Pakhtusova, K. Pugachev, S. Serednyakov, Z. Silagadze, I. Surin, Y. Usov, A. Vasiljev, V. Zhabin, V. Zhulanov","doi":"10.22323/1.336.0084","DOIUrl":"https://doi.org/10.22323/1.336.0084","url":null,"abstract":"A.A. Korol∗abc and M.N. Achasovab and A.Yu. Barnyakovab and K.I.Beloborodovab and A.V.Berdyuginab and A.G. Bogdanchikova and A.A.Botova and V.P. Druzhininab and V.B. Golubevab and L.V. Kardapoltsevab and A.G. Kharlamovab and S.V. Koshubaab and L.A. Korneeva and D.P. Kovrizhinab and A.S. Kupichab and R.A. Litvinova and K.A. Martinab and N.A. Melnikovaab and A.E. Obrazovskya and E.V. Pakhtusovaa and K.V. Pugachevab and S.I. Serednyakovab and D.A. Shtola and Z.K. Silagadzeab and I.K. Surina and Yu.V. Usovab and A.V. Vasiljevab and V.N. Zhabinab and V.V. Zhulanovab aBudker Institute of Nuclear Physics, Novosibirsk, Russia bNovosibirsk State University, Novosibirsk, Russia cE-mail: A.A.Korol@inp.nsk.su","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116196171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-09-12DOI: 10.1051/EPJCONF/201920406009
E. Kokoulina, A. Kutov, V. Nikitin, V. Riadovikov, A. Vorobiev
Multiparticle production is studied experimentally and theoretically in QCD that describes interactions in the language of quarks and gluons. In the experiment the real hadrons are registered. Various phenomenological models are used for transfer from quarks and gluons to observed hadrons. In order to describe the high multiplicity region, we have developed a gluon dominance model (GDM). It represents a convolution of two stages. The first stage is described as a part of QCD. For the second one (hadronization), the phenomenological model is used. To describe hadronization, a scheme has been proposed, consistent with the experimental data in the region of its dominance. Comparison of this model with data on e+e- annihilation over a wide energy interval (up to 200 GeV) has confirmed the fragmentation mechanism of hadronization, the development of the quark-gluon cascade with energy increase and domination of bremsstrahlung gluons. The description of topological cross sections in pp collisions within GDM testifies that in hadron collisions the mechanism of hadronization is being replaced by the recombination one. At that point, gluons play an active role in the multiparticle production process, and valence quarks are passive. They stay in the leading particles, and only the gluon splitting is responsible for the region of high multiplicity. GDM with inclusion of intermediate quark charged topologies describes topological cross sections in pp̅ annihilation and explains initial linear growth in the region of negative values of a secondary correlative momentum vs average pion multiplicity with increasing of energy. The proposed hadronization scheme can describe the basic processes of multiparticle production.
{"title":"A look at hadronization via high multiplicity","authors":"E. Kokoulina, A. Kutov, V. Nikitin, V. Riadovikov, A. Vorobiev","doi":"10.1051/EPJCONF/201920406009","DOIUrl":"https://doi.org/10.1051/EPJCONF/201920406009","url":null,"abstract":"Multiparticle production is studied experimentally and theoretically in QCD that describes interactions in the language of quarks and gluons. In the experiment the real hadrons are registered. Various phenomenological models are used for transfer from quarks and gluons to observed hadrons. In order to describe the high multiplicity region, we have developed a gluon dominance model (GDM). It represents a convolution of two stages. The first stage is described as a part of QCD. For the second one (hadronization), the phenomenological model is used. To describe hadronization, a scheme has been proposed, consistent with the experimental data in the region of its dominance. Comparison of this model with data on e+e- annihilation over a wide energy interval (up to 200 GeV) has confirmed the fragmentation mechanism of hadronization, the development of the quark-gluon cascade with energy increase and domination of bremsstrahlung gluons. The description of topological cross sections in pp collisions within GDM testifies that in hadron collisions the mechanism of hadronization is being replaced by the recombination one. At that point, gluons play an active role in the multiparticle production process, and valence quarks are passive. They stay in the leading particles, and only the gluon splitting is responsible for the region of high multiplicity. GDM with inclusion of intermediate quark charged topologies describes topological cross sections in pp̅ annihilation and explains initial linear growth in the region of negative values of a secondary correlative momentum vs average pion multiplicity with increasing of energy. The proposed hadronization scheme can describe the basic processes of multiparticle production.","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121208443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The mixing of hybrids with quarkonia","authors":"J. Soto","doi":"10.22323/1.336.0130","DOIUrl":"https://doi.org/10.22323/1.336.0130","url":null,"abstract":"","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128304809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Radiative corrections in Dalitz decays of $pi^0$, $eta$ and $eta^prime$ mesons","authors":"T. Husek","doi":"10.22323/1.336.0078","DOIUrl":"https://doi.org/10.22323/1.336.0078","url":null,"abstract":"","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133215898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Benayoun, J. Bijnens, T. Blum, I. Caprini, G. Colangelo, H. Czy.z, A. Denig, C. Dominguez, S. Eidelman, C. Fischer, P. Gauzzi, Yuping Guo, A. Hafner, M. Hayakawa, G. Herdoiza, M. Hoferichter, Guangshun Huang, K. Jansen, F. Jegerlehner, B. Kloss, B. Kubis, Zhiqing Liu, W. Marciano, P. Masjuan, H. Meyer, T. Mibe, A. Nyffeler, V. Pascalutsa, V. Pauk, M. Pennington, S. Peris, C. Redmer, P. Sánchez-Puertas, B. Shwartz, E. Solodov, D. Stoeckinger, T. Teubner, Marc Unverzagt, M. Vanderhaeghen, M. Wolke
The largest uncertainties in the Standard Model calculation of the anomalous magnetic moment of the muon (g−2)μ come from hadronic effects, namely hadronic vacuum polarization (HVP) and hadronic light-by-light (HLbL) contributions. Especially the latter is emerging as a potential roadblock for a more accurate determination of (g−2)μ. The main focus here is on a novel dispersive description of the HLbL tensor, which is based on unitarity, analyticity, crossing symmetry, and gauge invariance. This opens up the possibility of a data-driven determination of the HLbL contribution to (g−2)μ with the aim of reducing model dependence and achieving a reliable error estimate. Our dispersive approach defines unambiguously the pion-pole and the pion-box contribution to the HLbL tensor. Using Mandelstam double-spectral representation, we have proven that the pion-box contribution coincides exactly with the one-loop scalar-QED amplitude, multiplied by the appropriate pion vector form factors. Using dispersive fits to high-statistics data for the pion vector form factor, we obtain aπ-boxμ=−15.9(2)×10−11. A first model-independent calculation of effects of ππ intermediate states that go beyond the scalar-QED pion loop is also presented. We combine our dispersive description of the HLbL tensor with a partial-wave expansion and demonstrate that the known scalar-QED result is recovered after partial-wave resummation. After constructing suitable input for the γ∗γ∗→ππ helicity partial waves based on a pion-pole left-hand cut (LHC), we find that for the dominant charged-pion contribution this representation is consistent with the two-loop chiral prediction and the COMPASS measurement for the pion polarizability. This allows us to reliably estimate S-wave rescattering effects to the full pion box and leads to aπ-boxμ+aππ,π-pole LHCμ,J=0=−24(1)×10−11.
{"title":"Hadronic contributions to the muon anomalous magnetic moment","authors":"M. Benayoun, J. Bijnens, T. Blum, I. Caprini, G. Colangelo, H. Czy.z, A. Denig, C. Dominguez, S. Eidelman, C. Fischer, P. Gauzzi, Yuping Guo, A. Hafner, M. Hayakawa, G. Herdoiza, M. Hoferichter, Guangshun Huang, K. Jansen, F. Jegerlehner, B. Kloss, B. Kubis, Zhiqing Liu, W. Marciano, P. Masjuan, H. Meyer, T. Mibe, A. Nyffeler, V. Pascalutsa, V. Pauk, M. Pennington, S. Peris, C. Redmer, P. Sánchez-Puertas, B. Shwartz, E. Solodov, D. Stoeckinger, T. Teubner, Marc Unverzagt, M. Vanderhaeghen, M. Wolke","doi":"10.22323/1.336.0186","DOIUrl":"https://doi.org/10.22323/1.336.0186","url":null,"abstract":"The largest uncertainties in the Standard Model calculation of the anomalous magnetic moment of the muon (g−2)μ come from hadronic effects, namely hadronic vacuum polarization (HVP) and hadronic light-by-light (HLbL) contributions. Especially the latter is emerging as a potential roadblock for a more accurate determination of (g−2)μ. The main focus here is on a novel dispersive description of the HLbL tensor, which is based on unitarity, analyticity, crossing symmetry, and gauge invariance. This opens up the possibility of a data-driven determination of the HLbL contribution to (g−2)μ with the aim of reducing model dependence and achieving a reliable error estimate. Our dispersive approach defines unambiguously the pion-pole and the pion-box contribution to the HLbL tensor. Using Mandelstam double-spectral representation, we have proven that the pion-box contribution coincides exactly with the one-loop scalar-QED amplitude, multiplied by the appropriate pion vector form factors. Using dispersive fits to high-statistics data for the pion vector form factor, we obtain aπ-boxμ=−15.9(2)×10−11. A first model-independent calculation of effects of ππ intermediate states that go beyond the scalar-QED pion loop is also presented. We combine our dispersive description of the HLbL tensor with a partial-wave expansion and demonstrate that the known scalar-QED result is recovered after partial-wave resummation. After constructing suitable input for the γ∗γ∗→ππ helicity partial waves based on a pion-pole left-hand cut (LHC), we find that for the dominant charged-pion contribution this representation is consistent with the two-loop chiral prediction and the COMPASS measurement for the pion polarizability. This allows us to reliably estimate S-wave rescattering effects to the full pion box and leads to aπ-boxμ+aππ,π-pole LHCμ,J=0=−24(1)×10−11.","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124761866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Burgio, Antonio Figura, H. Schulze, Jin-Biao Wei
The detection of the GW170817 neutron star merger event has incited an intense research activity towards the understanding of the nuclear matter equation of state. In this paper we compare in particular the pressure-density relation obtained from heavy-ion collisions with the analysis of the NS merger event. Moreover, we present recent calculations of neutron star's moment of inertia and tidal deformability using various microscopic equations of state for nuclear and hybrid star configurations, and confirm several universal relations. We also discuss the recent constraints for the NS radii determined by GW170817, and find compatible radii between 12 and 13 kilometers, thus identifying the suitable equations of state.
{"title":"Constraints from the GW170817 merger event on thenuclear matter equation of state","authors":"F. Burgio, Antonio Figura, H. Schulze, Jin-Biao Wei","doi":"10.22323/1.336.0203","DOIUrl":"https://doi.org/10.22323/1.336.0203","url":null,"abstract":"The detection of the GW170817 neutron star merger event has incited an intense research activity towards the understanding of the nuclear matter equation of state. In this paper we compare in particular the pressure-density relation obtained from heavy-ion collisions with the analysis of the NS merger event. Moreover, we present recent calculations of neutron star's moment of inertia and tidal deformability using various microscopic equations of state for nuclear and hybrid star configurations, and confirm several universal relations. We also discuss the recent constraints for the NS radii determined by GW170817, and find compatible radii between 12 and 13 kilometers, thus identifying the suitable equations of state.","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132220565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Shibata, K. Kondo, Shogo Nishino, Takaaki Sasago, S. Kato
We investigate the type of dual superconductivity responsible for quark confinement. For this purpose, we solve the field equations of the $U(1)$ Abelian--Higgs model to obtain the static vortex solution in the whole range without restricting to the long-distance region. Then we use the resulting magnetic field of the vortex to fit the gauge-invariant chromoelectric field connecting a pair of quark and antiquark which was measured by numerical simulations for $SU(2)$ and $SU(3)$ Yang--Mills theories on a lattice. This result improves the accuracy of the fitted value for the Ginzburg--Landau parameter to reconfirm the type I dual superconductivity for quark confinement, which was claimed by preceding works based on an approximate method based on the Clem ansatz. Moreover, we calculate the Maxwell stress tensor for the fitted model to obtain the distribution of the force around the flux tube. This suggests that the attractive force acts on the surface perpendicular to the chromoelectric flux tube, in agreement with the type I dual superconductivity.
{"title":"Type of dual superconductivity for SU(2) and SU(3) Yang-Mills theories","authors":"A. Shibata, K. Kondo, Shogo Nishino, Takaaki Sasago, S. Kato","doi":"10.22323/1.336.0269","DOIUrl":"https://doi.org/10.22323/1.336.0269","url":null,"abstract":"We investigate the type of dual superconductivity responsible for quark confinement. For this purpose, we solve the field equations of the $U(1)$ Abelian--Higgs model to obtain the static vortex solution in the whole range without restricting to the long-distance region. Then we use the resulting magnetic field of the vortex to fit the gauge-invariant chromoelectric field connecting a pair of quark and antiquark which was measured by numerical simulations for $SU(2)$ and $SU(3)$ Yang--Mills theories on a lattice. This result improves the accuracy of the fitted value for the Ginzburg--Landau parameter to reconfirm the type I dual superconductivity for quark confinement, which was claimed by preceding works based on an approximate method based on the Clem ansatz. Moreover, we calculate the Maxwell stress tensor for the fitted model to obtain the distribution of the force around the flux tube. This suggests that the attractive force acts on the surface perpendicular to the chromoelectric flux tube, in agreement with the type I dual superconductivity.","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121316867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We present the final results from a multi-year study of the in-medium spectral properties of heavy quarkonium bound states on the lattice. In this work we combine high statistics $N_f=2+1$ ensembles from the HotQCD collaboration with the effective theory NRQCD and improved Bayesian spectral reconstruction methods. We corroborate with high precision the hierarchical in-medium modification of quarkonium states with respect to their vacuum binding energy and provide updated values on melting temperatures. In particular we are able to understand previous disagreements between different Bayesian methods as resulting from underestimated systematic uncertainties. The main quantitative result is a robust determination of the in-medium mass shifts of quarkonium ground states, which we find are negative, consistent with the behavior observed in strongly coupled pNRQCD potential based computations.
{"title":"In-medium heavy quarkonium from lattice NRQCD","authors":"Seyong Kim, P. Petreczky, A. Rothkopf","doi":"10.22323/1.336.0157","DOIUrl":"https://doi.org/10.22323/1.336.0157","url":null,"abstract":"We present the final results from a multi-year study of the in-medium spectral properties of heavy quarkonium bound states on the lattice. In this work we combine high statistics $N_f=2+1$ ensembles from the HotQCD collaboration with the effective theory NRQCD and improved Bayesian spectral reconstruction methods. We corroborate with high precision the hierarchical in-medium modification of quarkonium states with respect to their vacuum binding energy and provide updated values on melting temperatures. In particular we are able to understand previous disagreements between different Bayesian methods as resulting from underestimated systematic uncertainties. The main quantitative result is a robust determination of the in-medium mass shifts of quarkonium ground states, which we find are negative, consistent with the behavior observed in strongly coupled pNRQCD potential based computations.","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124308860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bayesian Gaussian Process Optimization can be considered as a method of the determination of the model parameters, based on the experimental data. In the range of soft QCD physics, the processes of hadron and nuclear interactions require using phenomenological models containing many parameters. In order to minimize the computation time, the model predictions can be parameterized using Gaussian Process regression, and then provide the input to the Bayesian Optimization. In this paper, the Bayesian Gaussian Process Optimization has been applied to the Monte Carlo model with string fusion. The parameters of the model are determined using experimental data on multiplicity and cross section of pp, pA and AA collisions at wide energy range. The results provide important constraints on the transverse radius of the quark-gluon string ($r_{str}$) and the mean multiplicity per rapidity from one string ($mu_0$).
{"title":"Determination of the quark-gluon string parameters from the data on pp, pA and AA collisions at wide energy range using Bayesian Gaussian Process Optimization","authors":"V. Kovalenko","doi":"10.22323/1.336.0235","DOIUrl":"https://doi.org/10.22323/1.336.0235","url":null,"abstract":"Bayesian Gaussian Process Optimization can be considered as a method of the determination of the model parameters, based on the experimental data. In the range of soft QCD physics, the processes of hadron and nuclear interactions require using phenomenological models containing many parameters. In order to minimize the computation time, the model predictions can be parameterized using Gaussian Process regression, and then provide the input to the Bayesian Optimization. In this paper, the Bayesian Gaussian Process Optimization has been applied to the Monte Carlo model with string fusion. The parameters of the model are determined using experimental data on multiplicity and cross section of pp, pA and AA collisions at wide energy range. The results provide important constraints on the transverse radius of the quark-gluon string ($r_{str}$) and the mean multiplicity per rapidity from one string ($mu_0$).","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129219646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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