QCD vacuum can be treated as a series of energetically equivalent, but topologically distinct sectors. The rate of transitions between various topological sectors is determined by the sphaleron rate ΓCS. This quantity is given by the limits of zero frequency and zero momentum of the correlator of topological charge density. Sphaleron rate is very similar to such transport coefficients as viscosity or conductivity. Sphaleron rate also describes time relaxation of the chiral charge. In this report we discuss the measurement of sphaleron rate in lattice gluodynamics in the deconfinement phase. We use Gradient Flow to measure the topological charge density correlator, and we also take continuum limit. We provide an estimation of the sphaleron rate in lattice gluodynamics and compare it with results obtained by other methods.
{"title":"Sphaleron rate in lattice gluodynamics","authors":"A. Kotov","doi":"10.22323/1.336.0147","DOIUrl":"https://doi.org/10.22323/1.336.0147","url":null,"abstract":"QCD vacuum can be treated as a series of energetically equivalent, but topologically distinct sectors. The rate of transitions between various topological sectors is determined by the sphaleron rate ΓCS. This quantity is given by the limits of zero frequency and zero momentum of the correlator of topological charge density. Sphaleron rate is very similar to such transport coefficients as viscosity or conductivity. Sphaleron rate also describes time relaxation of the chiral charge. In this report we discuss the measurement of sphaleron rate in lattice gluodynamics in the deconfinement phase. We use Gradient Flow to measure the topological charge density correlator, and we also take continuum limit. We provide an estimation of the sphaleron rate in lattice gluodynamics and compare it with results obtained by other methods.","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":"131127039","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}
GPUs represent one of the most sophisticated and versatile parallel computing architectures that have recently entered in the HEP field. GooFit is an open source tool interfacing ROOT/RooFit to the CUDA platform that allows to manipulate probability density functions and perform fitting tasks. The computing capabilities of GPUs with respect to traditional CPU cores have been explored with a high-statistics pseudo-experiment method implemented in GooFit with the purpose of estimating the local statistical significance of an already known signal. The striking performance obtained by using GooFit on GPUs has been discussed in the previous edition (XII) of this conference. This method has been extended to situations when, dealing with an unexpected new signal, a global significance must be estimated. The LEE is taken into account by means of a scanning/clustering technique in order to consider, within the same background only fluctuation and anywhere in the relevant mass spectrum, any fluctuating peaking behaviour with respect to the background model. The presented results clearly indicate that the systematic uncertainty associated to the method is negligible and that the p-value estimation is not affected by the clustering configuration. A comparison with the evaluation of the global significance provided by the method of trial factors is also provided.
{"title":"Estimation of global statistical significance of a new signal within the GooFit framework on GPUs","authors":"A. Florio","doi":"10.22323/1.336.0229","DOIUrl":"https://doi.org/10.22323/1.336.0229","url":null,"abstract":"GPUs represent one of the most sophisticated and versatile parallel computing architectures that have recently entered in the HEP field. GooFit is an open source tool interfacing ROOT/RooFit to the CUDA platform that allows to manipulate probability density functions and perform fitting tasks. The computing capabilities of GPUs with respect to traditional CPU cores have been explored with a high-statistics pseudo-experiment method implemented in GooFit with the purpose of estimating the local statistical significance of an already known signal. The striking performance obtained by using GooFit on GPUs has been discussed in the previous edition (XII) of this conference. This method has been extended to situations when, dealing with an unexpected new signal, a global significance must be estimated. The LEE is taken into account by means of a scanning/clustering technique in order to consider, within the same background only fluctuation and anywhere in the relevant mass spectrum, any fluctuating peaking behaviour with respect to the background model. The presented results clearly indicate that the systematic uncertainty associated to the method is negligible and that the p-value estimation is not affected by the clustering configuration. A comparison with the evaluation of the global significance provided by the method of trial factors is also provided.","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"148 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":"123427277","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":"Confinement, Instanton-dyons and Monopoles","authors":"E. Shuryak","doi":"10.22323/1.336.0062","DOIUrl":"https://doi.org/10.22323/1.336.0062","url":null,"abstract":"","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"98 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":"124982874","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":"Wess-Zumino-Witten term in QCD-like theories","authors":"H. Kolešová","doi":"10.22323/1.336.0209","DOIUrl":"https://doi.org/10.22323/1.336.0209","url":null,"abstract":"","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125807334","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}
Recent measurements from the ATLAS, CMS and LHCb collaborations are testing QCD withunprecedented precision and in a new energy regime. This talk covers recent measurements bythe LHC experiments on the production of jets, isolated photons, electroweak bosons and topquarks.
{"title":"Recent QCD results from LHC","authors":"K. Mueller, Cms Atlas, LHCb collaborations","doi":"10.22323/1.336.0020","DOIUrl":"https://doi.org/10.22323/1.336.0020","url":null,"abstract":"Recent measurements from the ATLAS, CMS and LHCb collaborations are testing QCD withunprecedented precision and in a new energy regime. This talk covers recent measurements bythe LHC experiments on the production of jets, isolated photons, electroweak bosons and topquarks.","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"294 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":"132257050","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":"Dense matter in strong magnetic fields without nucleons","authors":"T. Brauner","doi":"10.22323/1.336.0201","DOIUrl":"https://doi.org/10.22323/1.336.0201","url":null,"abstract":"","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"46 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":"130253771","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}
Applying the static Yang-Mills Maxwell equations to a simple system of SU(2) charges with spherical symmetry and confining boundary conditions provides for a demonstration of the likelihood that the confinement mechanism in non-Abelian gauge theories necessarily involves a topologically-charged domain wall consisting of a surface volume with CP-odd field strength density. The surface volume of a color-singlet system of SU(2) charges therefor describes the magnetic dual of a topological insulator. This essential topological structure is inextricably connected to the hadronic dynamics of the pion tornado. In analogy to the kink solution in the 1+1 dimensional Abelian Higgs model the classical solutions for the field equations in spherically symmetric SU(2) with this domain wall of topological charge can lead to a mass gap in the quantum system.
{"title":"Field-Strength Descriptions for a Confined System of SU(2) Charges","authors":"D. Sivers","doi":"10.22323/1.336.0063","DOIUrl":"https://doi.org/10.22323/1.336.0063","url":null,"abstract":"Applying the static Yang-Mills Maxwell equations to a simple system of SU(2) charges with spherical symmetry and confining boundary conditions provides for a demonstration of the likelihood that the confinement mechanism in non-Abelian gauge theories necessarily involves a topologically-charged domain wall consisting of a surface volume with CP-odd field strength density. The surface volume of a color-singlet system of SU(2) charges therefor describes the magnetic dual of a topological insulator. This essential topological structure is inextricably connected to the hadronic dynamics of the pion tornado. In analogy to the kink solution in the 1+1 dimensional Abelian Higgs model the classical solutions for the field equations in spherically symmetric SU(2) with this domain wall of topological charge can lead to a mass gap in the quantum system.","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":"129617321","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 a model for the QCD structure of hadrons as seen in the dipole picture. The model is based on hot spots – regions of large gluonic density – populating the impact parameter space. In our model, the number of hot spots grows with energy and their positions fluctuate event-by-event. Using this model, we calculate coherent and incoherent photoproduction of vector mesons (VM) off a proton and nuclear targets. We compare our predictions with current data from HERA, RHIC and the LHC at different energies. We also present new signatures of saturation effects that could be observed with current and future data.
{"title":"Energy-dependent hotspots model via vector meson photoproduction","authors":"M. Krelina, J. Čepila, J. Nuno, J. D. T. Takaki","doi":"10.22323/1.336.0258","DOIUrl":"https://doi.org/10.22323/1.336.0258","url":null,"abstract":"We present a model for the QCD structure of hadrons as seen in the dipole picture. The model is based on hot spots – regions of large gluonic density – populating the impact parameter space. In our model, the number of hot spots grows with energy and their positions fluctuate event-by-event. Using this model, we calculate coherent and incoherent photoproduction of vector mesons (VM) off a proton and nuclear targets. We compare our predictions with current data from HERA, RHIC and the LHC at different energies. We also present new signatures of saturation effects that could be observed with current and future data.","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"28 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":"129640693","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}
The PANDA experiment represents the central part of the hadron physics programme at the new Facility for Antiproton and Ion Research (FAIR) under construction at GSI/Darmstadt (Germany). The multi-purpose PANDA detector in combination with an intense and high-quality antiproton beam allows for coverage of a broad range of different aspects of QCD, and it is best suited for charmonium spectroscopy. We present a comprehensive PANDA Monte Carlo simulation study for precision resonance energy scan measurements, using the example of the charmoniumlike X(3872) state discussed to be exotic. Apart from the proof of principle for natural decay width and line-shape measurements of very narrow resonances, the achievable sensitivities are quantified for the concrete example of the X(3872). The discussed measurement is uniquely possible with a p̄p annihilation experiment such as PANDA at FAIR.
{"title":"Precision spectroscopy of charmonium-like (exotic) XYZ states at PANDA/FAIR","authors":"F. Nerling, K. Peters, R. Kliemt, K. Götzen","doi":"10.22323/1.336.0120","DOIUrl":"https://doi.org/10.22323/1.336.0120","url":null,"abstract":"The PANDA experiment represents the central part of the hadron physics programme at the new Facility for Antiproton and Ion Research (FAIR) under construction at GSI/Darmstadt (Germany). The multi-purpose PANDA detector in combination with an intense and high-quality antiproton beam allows for coverage of a broad range of different aspects of QCD, and it is best suited for charmonium spectroscopy. We present a comprehensive PANDA Monte Carlo simulation study for precision resonance energy scan measurements, using the example of the charmoniumlike X(3872) state discussed to be exotic. Apart from the proof of principle for natural decay width and line-shape measurements of very narrow resonances, the achievable sensitivities are quantified for the concrete example of the X(3872). The discussed measurement is uniquely possible with a p̄p annihilation experiment such as PANDA at FAIR.","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"5 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":"134234720","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":"Large-${N_{mathrm{c}}^{}}$ QCD and tetraquarks","authors":"H. Sazdjian","doi":"10.22323/1.336.0028","DOIUrl":"https://doi.org/10.22323/1.336.0028","url":null,"abstract":"","PeriodicalId":441384,"journal":{"name":"Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)","volume":"171 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":"133906398","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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