Pub Date : 2025-01-21DOI: 10.1103/physrevd.111.016018
N. K. Dulaev, D. A. Telnov, V. M. Shabaev, Y. S. Kozhedub, X. Ma, I. A. Maltsev, R. V. Popov, I. I. Tupitsyn
Energy-angle differential and total probabilities of positron creation in slow supercritical collisions of two identical heavy nuclei are calculated beyond the monopole approximation. The time-dependent Dirac equation (TDDE) for positrons is solved using the generalized pseudospectral method in modified prolate spheroidal coordinates, which are well suited for description of close collisions in two-center quantum systems. In the frame of reference where the quasimolecular axis is fixed, the rotational coupling term is added to the Hamiltonian. Unlike our previous calculations, we do not discard this term and retain it when solving the TDDE. Both three-dimensional angle-resolved and angle-integrated energy distributions of outgoing positrons are obtained. Three-dimensional angle-resolved distributions exhibit a high degree of isotropy. For the collision energies in the interval 6 to 8MeV/u, the influence of the rotational coupling on the distributions and total positron creation probabilities is quite small. Published by the American Physical Society2025
{"title":"Three-dimensional calculations of positron creation in supercritical collisions of heavy nuclei","authors":"N. K. Dulaev, D. A. Telnov, V. M. Shabaev, Y. S. Kozhedub, X. Ma, I. A. Maltsev, R. V. Popov, I. I. Tupitsyn","doi":"10.1103/physrevd.111.016018","DOIUrl":"https://doi.org/10.1103/physrevd.111.016018","url":null,"abstract":"Energy-angle differential and total probabilities of positron creation in slow supercritical collisions of two identical heavy nuclei are calculated beyond the monopole approximation. The time-dependent Dirac equation (TDDE) for positrons is solved using the generalized pseudospectral method in modified prolate spheroidal coordinates, which are well suited for description of close collisions in two-center quantum systems. In the frame of reference where the quasimolecular axis is fixed, the rotational coupling term is added to the Hamiltonian. Unlike our previous calculations, we do not discard this term and retain it when solving the TDDE. Both three-dimensional angle-resolved and angle-integrated energy distributions of outgoing positrons are obtained. Three-dimensional angle-resolved distributions exhibit a high degree of isotropy. For the collision energies in the interval 6 to 8</a:mn></a:mtext></a:mtext>MeV</a:mi>/</a:mo>u</a:mi></a:mrow></a:math>, the influence of the rotational coupling on the distributions and total positron creation probabilities is quite small. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"105 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-21DOI: 10.1103/physrevd.111.015015
N. B. Clayburn, A. Glassford, A. Leiker, T. Uelmen, J. F. Lin, L. R. Hunter
Terrestrial experiments that use electrons in Earth as a spin-polarized source have been demonstrated to provide strong bounds on exotic long-range spin-spin and spin-velocity interactions. These bounds constrain the coupling strength of many proposed ultralight bosonic dark-matter candidates. Recently, it was pointed out that a monopole-dipole coupling between the Sun and the spin-polarized electrons of Earth would result in a modification of the precession of the perihelion of Earth. Using an estimate for the net spin polarization of Earth and experimental bounds on Earth’s perihelion precession, interesting constraints were placed on the magnitude of this monopole-dipole coupling. Here we investigate the spin associated with Earth’s electrons. We find that there are about 6×1041 spin-polarized electrons in the mantle and crust of Earth oriented antiparallel to their local magnetic field. However, when integrated over any spherically symmetric Earth model, we find that the vector sum of these spins is zero. In order to establish a lower bound on the magnitude of the net spin along Earth’s rotation axis we have investigated three of the largest breakdowns of Earth’s spherical symmetry: the large low shear-velocity provinces of the mantle, the crustal composition, and the oblate spheroid of Earth. From these investigations we conclude that there are at least 5×1038 spin-polarized electrons aligned antiparallel to Earth’s rotation axis. This analysis suggests that the bounds on the monopole-dipole coupling that were extracted from Earth’s perihelion precession need to be relaxed by a factor of about 2000. Published by the American Physical Society2025
{"title":"Spherically symmetric Earth models yield no net electron spin","authors":"N. B. Clayburn, A. Glassford, A. Leiker, T. Uelmen, J. F. Lin, L. R. Hunter","doi":"10.1103/physrevd.111.015015","DOIUrl":"https://doi.org/10.1103/physrevd.111.015015","url":null,"abstract":"Terrestrial experiments that use electrons in Earth as a spin-polarized source have been demonstrated to provide strong bounds on exotic long-range spin-spin and spin-velocity interactions. These bounds constrain the coupling strength of many proposed ultralight bosonic dark-matter candidates. Recently, it was pointed out that a monopole-dipole coupling between the Sun and the spin-polarized electrons of Earth would result in a modification of the precession of the perihelion of Earth. Using an estimate for the net spin polarization of Earth and experimental bounds on Earth’s perihelion precession, interesting constraints were placed on the magnitude of this monopole-dipole coupling. Here we investigate the spin associated with Earth’s electrons. We find that there are about 6</a:mn>×</a:mo>10</a:mn>41</a:mn></a:msup></a:math> spin-polarized electrons in the mantle and crust of Earth oriented antiparallel to their local magnetic field. However, when integrated over any spherically symmetric Earth model, we find that the vector sum of these spins is zero. In order to establish a lower bound on the magnitude of the net spin along Earth’s rotation axis we have investigated three of the largest breakdowns of Earth’s spherical symmetry: the large low shear-velocity provinces of the mantle, the crustal composition, and the oblate spheroid of Earth. From these investigations we conclude that there are at least <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:mn>5</c:mn><c:mo>×</c:mo><c:msup><c:mn>10</c:mn><c:mn>38</c:mn></c:msup></c:math> spin-polarized electrons aligned antiparallel to Earth’s rotation axis. This analysis suggests that the bounds on the monopole-dipole coupling that were extracted from Earth’s perihelion precession need to be relaxed by a factor of about 2000. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"32 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-21DOI: 10.1103/physrevd.111.016019
Eugene Levin
In this paper we found the multiplicity distribution of the produced dipoles in the final state for dipole-dipole scattering in the zero dimension toy models. This distribution shows the great differences from the distributions of partons in the wave function of the projectile. However, in spite of this difference the entropy of the produced dipoles turns out to be the same as the entropy of the dipoles in the wave function. This fact is not surprising since in the parton approach only dipoles in the hadron wave function which can be produced at t=+∞ and measured by the detectors. We can also confirm the result of Kharzeev and Levin that this entropy is equal to SE=ln(xG(x)), where we denote by xG the mean multiplicity of the dipoles in the deep inelastic scattering. The evolution equations for σn are derived. Published by the American Physical Society2025
{"title":"Particle production in a toy model: Multiplicity distribution and entropy","authors":"Eugene Levin","doi":"10.1103/physrevd.111.016019","DOIUrl":"https://doi.org/10.1103/physrevd.111.016019","url":null,"abstract":"In this paper we found the multiplicity distribution of the produced dipoles in the final state for dipole-dipole scattering in the zero dimension toy models. This distribution shows the great differences from the distributions of partons in the wave function of the projectile. However, in spite of this difference the entropy of the produced dipoles turns out to be the same as the entropy of the dipoles in the wave function. This fact is not surprising since in the parton approach only dipoles in the hadron wave function which can be produced at t</a:mi>=</a:mo>+</a:mo>∞</a:mi></a:math> and measured by the detectors. We can also confirm the result of Kharzeev and Levin that this entropy is equal to <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:msub><c:mi>S</c:mi><c:mi>E</c:mi></c:msub><c:mo>=</c:mo><c:mi>ln</c:mi><c:mrow><c:mo stretchy=\"false\">(</c:mo><c:mi>x</c:mi><c:mi>G</c:mi><c:mo stretchy=\"false\">(</c:mo><c:mi>x</c:mi><c:mo stretchy=\"false\">)</c:mo><c:mo stretchy=\"false\">)</c:mo></c:mrow></c:math>, where we denote by <i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><i:mi>x</i:mi><i:mi>G</i:mi></i:math> the mean multiplicity of the dipoles in the deep inelastic scattering. The evolution equations for <k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><k:msub><k:mi>σ</k:mi><k:mi>n</k:mi></k:msub></k:math> are derived. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"164 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-21DOI: 10.1103/physrevd.111.016020
Yi-An Chen, Kai-Feng Chen
Machine learning, particularly deep neural networks, has been widely used in high-energy physics, demonstrating remarkable results in various applications. Furthermore, the extension of machine learning to quantum computers has given rise to the emerging field of quantum machine learning. In this paper, we propose the quantum complete graph neural network (QCGNN), which is a variational quantum algorithm-based model designed for learning on complete graphs. The QCGNN with deep parametrized operators offers a polynomial speedup over its classical and quantum counterparts, leveraging the property of quantum parallelism. We investigate the application of the QCGNN with the challenging task of jet discrimination, where the jets are represented as complete graphs. Additionally, we conduct a comparative analysis with classical models to establish a performance benchmark. Published by the American Physical Society2025
{"title":"Jet discrimination with a quantum complete graph neural network","authors":"Yi-An Chen, Kai-Feng Chen","doi":"10.1103/physrevd.111.016020","DOIUrl":"https://doi.org/10.1103/physrevd.111.016020","url":null,"abstract":"Machine learning, particularly deep neural networks, has been widely used in high-energy physics, demonstrating remarkable results in various applications. Furthermore, the extension of machine learning to quantum computers has given rise to the emerging field of quantum machine learning. In this paper, we propose the quantum complete graph neural network (QCGNN), which is a variational quantum algorithm-based model designed for learning on complete graphs. The QCGNN with deep parametrized operators offers a polynomial speedup over its classical and quantum counterparts, leveraging the property of quantum parallelism. We investigate the application of the QCGNN with the challenging task of jet discrimination, where the jets are represented as complete graphs. Additionally, we conduct a comparative analysis with classical models to establish a performance benchmark. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"137 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-17DOI: 10.1103/physrevd.111.015012
Vasileios Basiouris, Miguel Crispim Romão, Stephen F. King, George K. Leontaris
We discuss modular family symmetry in effective theories based on generic properties of bottom-up local F-theory inspired grand unified theories (GUTs) broken by fluxes, which we refer to as fluxed GUTs. We argue that the Yukawa couplings will depend on the complex structure moduli of the matter curves in such a way that they can be modular forms associated with these symmetries. To illustrate the approach, we analyze in detail a concrete local fluxed SU(5) GUT with modular S4 family symmetry. Published by the American Physical Society2025
{"title":"Modular family symmetry in fluxed GUTs","authors":"Vasileios Basiouris, Miguel Crispim Romão, Stephen F. King, George K. Leontaris","doi":"10.1103/physrevd.111.015012","DOIUrl":"https://doi.org/10.1103/physrevd.111.015012","url":null,"abstract":"We discuss modular family symmetry in effective theories based on generic properties of bottom-up local F-theory inspired grand unified theories (GUTs) broken by fluxes, which we refer to as fluxed GUTs. We argue that the Yukawa couplings will depend on the complex structure moduli of the matter curves in such a way that they can be modular forms associated with these symmetries. To illustrate the approach, we analyze in detail a concrete local fluxed S</a:mi>U</a:mi>(</a:mo>5</a:mn>)</a:mo></a:mrow></a:math> GUT with modular <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:msub><e:mi>S</e:mi><e:mn>4</e:mn></e:msub></e:math> family symmetry. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"37 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-17DOI: 10.1103/physrevd.111.013004
K. S. Kuzmin, N. M. Levashko, M. I. Krivoruchenko
An extended vector meson dominance model is developed to describe electromagnetic nucleon form factors. The model includes families of the ρ- and ω-mesons with the associated radial excitations. The free parameters of the model are determined using a global statistical analysis of experimental data on the electromagnetic nucleon form factors in space- and timelike regions of transferred momenta. The vector meson masses and widths are equal to their empirical values, while the residues of form factors at the poles corresponding to the ground states of the ρ- and ω-mesons are consistent with the findings of both the Frazer-Fulco unitarity relations and the Bonn potential for coupling constants of the ρ- and ω-mesons with nucleons. Theoretical constraints imposed on the model include the quark counting rules, the Okubo-Zweig-Iizuka rule, the scaling law of Sachs form factors at moderate momentum transfers, and the suppression of Sachs form factors near the nucleon–antinucleon threshold. A reasonable description of the nucleon form factors in the experimentally accessible range of transferred momenta, as well as the electric and magnetic nucleon radii and Zemach radii, is obtained. Published by the American Physical Society2025
{"title":"Electromagnetic nucleon form factors in the extended vector meson dominance model","authors":"K. S. Kuzmin, N. M. Levashko, M. I. Krivoruchenko","doi":"10.1103/physrevd.111.013004","DOIUrl":"https://doi.org/10.1103/physrevd.111.013004","url":null,"abstract":"An extended vector meson dominance model is developed to describe electromagnetic nucleon form factors. The model includes families of the ρ</a:mi></a:math>- and <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:mi>ω</c:mi></c:math>-mesons with the associated radial excitations. The free parameters of the model are determined using a global statistical analysis of experimental data on the electromagnetic nucleon form factors in space- and timelike regions of transferred momenta. The vector meson masses and widths are equal to their empirical values, while the residues of form factors at the poles corresponding to the ground states of the <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:mi>ρ</e:mi></e:math>- and <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><g:mi>ω</g:mi></g:math>-mesons are consistent with the findings of both the Frazer-Fulco unitarity relations and the Bonn potential for coupling constants of the <i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><i:mi>ρ</i:mi></i:math>- and <k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><k:mi>ω</k:mi></k:math>-mesons with nucleons. Theoretical constraints imposed on the model include the quark counting rules, the Okubo-Zweig-Iizuka rule, the scaling law of Sachs form factors at moderate momentum transfers, and the suppression of Sachs form factors near the nucleon–antinucleon threshold. A reasonable description of the nucleon form factors in the experimentally accessible range of transferred momenta, as well as the electric and magnetic nucleon radii and Zemach radii, is obtained. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"30 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142989291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-17DOI: 10.1103/physrevd.111.014018
Qi Meng, Guang-Juan Wang, Makoto Oka
A comprehensive study of the S</a:mi></a:math>-wave heavy tetraquark states with identical quarks and antiquarks, specifically <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>Q</c:mi><c:mi>Q</c:mi><c:msup><c:mover accent="true"><c:mi>Q</c:mi><c:mo stretchy="false">¯</c:mo></c:mover><c:mo>′</c:mo></c:msup><c:msup><c:mover accent="true"><c:mi>Q</c:mi><c:mo stretchy="false">¯</c:mo></c:mover><c:mo>′</c:mo></c:msup></c:math> (<i:math xmlns:i="http://www.w3.org/1998/Math/MathML" display="inline"><i:mi>Q</i:mi><i:mo>,</i:mo><i:msup><i:mi>Q</i:mi><i:mo>′</i:mo></i:msup><i:mo>=</i:mo><i:mi>c</i:mi></i:math>, <k:math xmlns:k="http://www.w3.org/1998/Math/MathML" display="inline"><k:mrow><k:mi>b</k:mi></k:mrow></k:math>), <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" display="inline"><m:mi>Q</m:mi><m:mi>Q</m:mi><m:mover accent="true"><m:mi>s</m:mi><m:mo stretchy="false">¯</m:mo></m:mover><m:mover accent="true"><m:mi>s</m:mi><m:mo stretchy="false">¯</m:mo></m:mover><m:mo>/</m:mo><m:mover accent="true"><m:mi>Q</m:mi><m:mo stretchy="false">¯</m:mo></m:mover><m:mover accent="true"><m:mi>Q</m:mi><m:mo stretchy="false">¯</m:mo></m:mover><m:mi>s</m:mi><m:mi>s</m:mi></m:math>, and <w:math xmlns:w="http://www.w3.org/1998/Math/MathML" display="inline"><w:mi>Q</w:mi><w:mi>Q</w:mi><w:mover accent="true"><w:mi>q</w:mi><w:mo stretchy="false">¯</w:mo></w:mover><w:mover accent="true"><w:mi>q</w:mi><w:mo stretchy="false">¯</w:mo></w:mover><w:mo>/</w:mo><w:mover accent="true"><w:mi>Q</w:mi><w:mo stretchy="false">¯</w:mo></w:mover><w:mover accent="true"><w:mi>Q</w:mi><w:mo stretchy="false">¯</w:mo></w:mover><w:mi>q</w:mi><w:mi>q</w:mi></w:math> (<gb:math xmlns:gb="http://www.w3.org/1998/Math/MathML" display="inline"><gb:mrow><gb:mi>q</gb:mi><gb:mo>=</gb:mo><gb:mi>u</gb:mi></gb:mrow></gb:math>, <ib:math xmlns:ib="http://www.w3.org/1998/Math/MathML" display="inline"><ib:mrow><ib:mi>d</ib:mi></ib:mrow></ib:math>), are studied in a unified constituent quark model. This model contains the one-gluon exchange and confinement potentials. The latter is modeled as the sum of all two-body linear potentials. We employ the Gaussian expansion method to solve the full four-body Schrödinger equations, and search bound and resonant states using the complex-scaling method. We then identify 3 bound and 62 resonant states. The bound states are all <kb:math xmlns:kb="http://www.w3.org/1998/Math/MathML" display="inline"><kb:mi>Q</kb:mi><kb:mi>Q</kb:mi><kb:mover accent="true"><kb:mi>q</kb:mi><kb:mo stretchy="false">¯</kb:mo></kb:mover><kb:mover accent="true"><kb:mi>q</kb:mi><kb:mo stretchy="false">¯</kb:mo></kb:mover></kb:math> states with the isospin and spin-parity quantum numbers <qb:math xmlns:qb="http://www.w3.org/1998/Math/MathML" display="inline"><qb:mi>I</qb:mi><qb:mo stretchy="false">(</qb:mo><qb:msup><qb:mi>J</qb:mi><qb:mi>P</qb:mi></qb:msup><qb:mo stretchy="false">)</qb:mo><qb:mo>=</qb:mo><qb:mn>0</qb:mn><qb:mo stretchy="false">(</qb:mo><qb:msup><qb:mn>
{"title":"Mass spectra of full-heavy and double-heavy tetraquark states in the conventional quark model","authors":"Qi Meng, Guang-Juan Wang, Makoto Oka","doi":"10.1103/physrevd.111.014018","DOIUrl":"https://doi.org/10.1103/physrevd.111.014018","url":null,"abstract":"A comprehensive study of the S</a:mi></a:math>-wave heavy tetraquark states with identical quarks and antiquarks, specifically <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:mi>Q</c:mi><c:mi>Q</c:mi><c:msup><c:mover accent=\"true\"><c:mi>Q</c:mi><c:mo stretchy=\"false\">¯</c:mo></c:mover><c:mo>′</c:mo></c:msup><c:msup><c:mover accent=\"true\"><c:mi>Q</c:mi><c:mo stretchy=\"false\">¯</c:mo></c:mover><c:mo>′</c:mo></c:msup></c:math> (<i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><i:mi>Q</i:mi><i:mo>,</i:mo><i:msup><i:mi>Q</i:mi><i:mo>′</i:mo></i:msup><i:mo>=</i:mo><i:mi>c</i:mi></i:math>, <k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><k:mrow><k:mi>b</k:mi></k:mrow></k:math>), <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><m:mi>Q</m:mi><m:mi>Q</m:mi><m:mover accent=\"true\"><m:mi>s</m:mi><m:mo stretchy=\"false\">¯</m:mo></m:mover><m:mover accent=\"true\"><m:mi>s</m:mi><m:mo stretchy=\"false\">¯</m:mo></m:mover><m:mo>/</m:mo><m:mover accent=\"true\"><m:mi>Q</m:mi><m:mo stretchy=\"false\">¯</m:mo></m:mover><m:mover accent=\"true\"><m:mi>Q</m:mi><m:mo stretchy=\"false\">¯</m:mo></m:mover><m:mi>s</m:mi><m:mi>s</m:mi></m:math>, and <w:math xmlns:w=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><w:mi>Q</w:mi><w:mi>Q</w:mi><w:mover accent=\"true\"><w:mi>q</w:mi><w:mo stretchy=\"false\">¯</w:mo></w:mover><w:mover accent=\"true\"><w:mi>q</w:mi><w:mo stretchy=\"false\">¯</w:mo></w:mover><w:mo>/</w:mo><w:mover accent=\"true\"><w:mi>Q</w:mi><w:mo stretchy=\"false\">¯</w:mo></w:mover><w:mover accent=\"true\"><w:mi>Q</w:mi><w:mo stretchy=\"false\">¯</w:mo></w:mover><w:mi>q</w:mi><w:mi>q</w:mi></w:math> (<gb:math xmlns:gb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><gb:mrow><gb:mi>q</gb:mi><gb:mo>=</gb:mo><gb:mi>u</gb:mi></gb:mrow></gb:math>, <ib:math xmlns:ib=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><ib:mrow><ib:mi>d</ib:mi></ib:mrow></ib:math>), are studied in a unified constituent quark model. This model contains the one-gluon exchange and confinement potentials. The latter is modeled as the sum of all two-body linear potentials. We employ the Gaussian expansion method to solve the full four-body Schrödinger equations, and search bound and resonant states using the complex-scaling method. We then identify 3 bound and 62 resonant states. The bound states are all <kb:math xmlns:kb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><kb:mi>Q</kb:mi><kb:mi>Q</kb:mi><kb:mover accent=\"true\"><kb:mi>q</kb:mi><kb:mo stretchy=\"false\">¯</kb:mo></kb:mover><kb:mover accent=\"true\"><kb:mi>q</kb:mi><kb:mo stretchy=\"false\">¯</kb:mo></kb:mover></kb:math> states with the isospin and spin-parity quantum numbers <qb:math xmlns:qb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><qb:mi>I</qb:mi><qb:mo stretchy=\"false\">(</qb:mo><qb:msup><qb:mi>J</qb:mi><qb:mi>P</qb:mi></qb:msup><qb:mo stretchy=\"false\">)</qb:mo><qb:mo>=</qb:mo><qb:mn>0</qb:mn><qb:mo stretchy=\"false\">(</qb:mo><qb:msup><qb:mn>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"45 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In a previous publication, we studied the parameter space of the phenomenological minimal Supersymmetric standard model with a light neutralino thermal dark matter (Mχ˜10≤Mh/2) and observed that the recent results from the dark matter and collider experiments put strong constraints on this scenario. In this work, we present in detail the arguments behind the robustness of this result against scanning over the large number of parameters in phenomenological minimal Supersymmetric standard model. The Run 3 of LHC will be crucial in probing the surviving regions of the parameter space. We further investigate the impact of light staus on our parameter space and also provide benchmarks that can be interesting for Run 3 of LHC. We analyze these benchmarks at the LHC using the machine learning framework of . Finally, we also discuss the effect of nonstandard cosmology on the parameter space. Published by the American Physical Society2025
{"title":"Current status of the light neutralino thermal dark matter in the phenomenological MSSM","authors":"Rahool Kumar Barman, Genevieve Bélanger, Biplob Bhattacherjee, Rohini Godbole, Rhitaja Sengupta","doi":"10.1103/physrevd.111.015014","DOIUrl":"https://doi.org/10.1103/physrevd.111.015014","url":null,"abstract":"In a previous publication, we studied the parameter space of the phenomenological minimal Supersymmetric standard model with a light neutralino thermal dark matter (M</a:mi></a:mrow>χ</a:mi></a:mrow>˜</a:mo></a:mrow></a:mover></a:mrow>1</a:mn></a:mrow>0</a:mn></a:mrow></a:msubsup></a:mrow></a:msub>≤</a:mo>M</a:mi></a:mrow>h</a:mi></a:mrow></a:msub>/</a:mo>2</a:mn></a:mrow></a:math>) and observed that the recent results from the dark matter and collider experiments put strong constraints on this scenario. In this work, we present in detail the arguments behind the robustness of this result against scanning over the large number of parameters in phenomenological minimal Supersymmetric standard model. The Run 3 of LHC will be crucial in probing the surviving regions of the parameter space. We further investigate the impact of light staus on our parameter space and also provide benchmarks that can be interesting for Run 3 of LHC. We analyze these benchmarks at the LHC using the machine learning framework of . Finally, we also discuss the effect of nonstandard cosmology on the parameter space. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"55 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-16DOI: 10.1103/physrevd.111.014017
L. S. Moriggi, M. V. T. Machado
In this work, we confront the geometrical scaling properties of inclusive deep inelastic scattering cross section (e+p→e+X) with the scaling entropy obtained from event multiplicity. We show that these two quantities are equivalent in the kinematic range probed by H1 Collaboration data. We propose that scaling entropy associated with partonic interactions is a more efficient way to detect scaling in experimental data. We used a combined analysis of the inclusive cross section and entropy obtained from multiplicities P(N) of final-state hadrons to accurately determine the value of the Pomeron intercept. The approach could provide new constraints for future hadron collider experiments and deepen our understanding of parton saturation. Published by the American Physical Society2025
{"title":"Precise determination of the Pomeron intercept via a scaling entropy analysis","authors":"L. S. Moriggi, M. V. T. Machado","doi":"10.1103/physrevd.111.014017","DOIUrl":"https://doi.org/10.1103/physrevd.111.014017","url":null,"abstract":"In this work, we confront the geometrical scaling properties of inclusive deep inelastic scattering cross section (e</a:mi>+</a:mo>p</a:mi>→</a:mo>e</a:mi>+</a:mo>X</a:mi></a:math>) with the scaling entropy obtained from event multiplicity. We show that these two quantities are equivalent in the kinematic range probed by H1 Collaboration data. We propose that scaling entropy associated with partonic interactions is a more efficient way to detect scaling in experimental data. We used a combined analysis of the inclusive cross section and entropy obtained from multiplicities <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><d:mi>P</d:mi><d:mo stretchy=\"false\">(</d:mo><d:mi>N</d:mi><d:mo stretchy=\"false\">)</d:mo></d:math> of final-state hadrons to accurately determine the value of the Pomeron intercept. The approach could provide new constraints for future hadron collider experiments and deepen our understanding of parton saturation. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"30 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}