Few-Body SystemsPub Date : 2024-11-17DOI: 10.1007/s00601-024-01966-6
Faizuddin Ahmed, Abdelmalek Bouzenada
{"title":"Rainbow Gravity Effects on Relativistic Quantum Oscillator Field in a Topological Defect Cosmological Space-Time","authors":"Faizuddin Ahmed, Abdelmalek Bouzenada","doi":"10.1007/s00601-024-01966-6","DOIUrl":"10.1007/s00601-024-01966-6","url":null,"abstract":"<div><p>In this paper, we investigate the quantum dynamics of scalar and oscillator fields in a topological defect space-time background under the influence of rainbow gravity’s. The rainbow gravity’s are introduced into the considered cosmological space-time geometry by replacing the temporal part <span>(dt rightarrow frac{dt}{mathcal {F}(chi )})</span> and the spatial part <span>(dx^i rightarrow frac{dx^i}{mathcal {H} (chi )})</span>, where <span>(mathcal {F}, mathcal {H})</span> are the rainbow functions and <span>(0 le chi =|E|/E_p <1)</span> is the dimensionless parameter. We derived the radial equation of the Klein–Gordon equation and its oscillator equation under rainbow gravity’s in topological space-time. To obtain eigenvalue of the quantum systems under investigations, we set the rainbow functions <span>(mathcal {F}(chi )=1)</span> and <span>(mathcal {H}(chi )=sqrt{1-beta ,chi ^p})</span>, where <span>(p=1,2)</span>. We solve the radial equations through special functions using these rainbow functions and analyze the results. In fact, it is shown that the presence of cosmological constant, the topological defect parameter <span>(alpha )</span>, and the rainbow parameter <span>(beta )</span> modified the energy spectrum of scalar and oscillator fields in comparison to the results obtained in flat space.\u0000</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Few-Body SystemsPub Date : 2024-11-15DOI: 10.1007/s00601-024-01972-8
K. Bakke
{"title":"On a Repulsive Short-Range Potential Influence on the Harmonic Oscillator","authors":"K. Bakke","doi":"10.1007/s00601-024-01972-8","DOIUrl":"10.1007/s00601-024-01972-8","url":null,"abstract":"<div><p>We study the influence of a symmetrically spherical potential on the harmonic oscillator. The symmetrically spherical potential consists of a repulsive short-range potential inspired by the power-exponential potential. By dealing with <i>s</i>-wave in the region where the repulsive short-range potential is significant, we show how the energy levels of the three-dimensional harmonic oscillator are modified by the short-range potential influence. Furthermore, we show that a non-null revival time with regard to the <i>s</i>-state exists.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Few-Body SystemsPub Date : 2023-07-20DOI: 10.1007/s00601-023-01848-3
E. Omugbe, J. N. Aniezi, E. P. Inyang, I. J. Njoku, C. A. Onate, E. S. Eyube, S. O. Ogundeji, A. Jahanshir, M. C. Onyeaju, C. Mbamara, R. M. Obodo, I. B. Okon
{"title":"Non-relativistic Mass Spectra Splitting of Heavy Mesons Under the Cornell Potential Perturbed by Spin–Spin, Spin–Orbit and Tensor Components","authors":"E. Omugbe, J. N. Aniezi, E. P. Inyang, I. J. Njoku, C. A. Onate, E. S. Eyube, S. O. Ogundeji, A. Jahanshir, M. C. Onyeaju, C. Mbamara, R. M. Obodo, I. B. Okon","doi":"10.1007/s00601-023-01848-3","DOIUrl":"10.1007/s00601-023-01848-3","url":null,"abstract":"<div><p>In this paper, we have obtained the analytical and numerical mass spectra of the charmonium and bottomonium mesons using the non-relativistic Schrödinger equation under a spin–spin, spin–orbit and tensor coupled Cornell potential energy. We adopted the Wentzel–Kramers–Brilluoin approximation method to obtain the energy bound equation in closed form. We obtained the potential free parameters by fitting the mass spectra equation to the experimental data of the Particle Data Group. The hyperfine mass splitting of the mesons are obtained for different singlet (<span>(s=0))</span> and triplet (<span>(s=1))</span> quantum states (<span>(n^{2s+1}l_{j}))</span>. Also, the hyperfine multiplet splitting for <span>(l>0)</span> and total angular momentum quantum number <span>(j=l, j=lpm 1)</span> were obtained. The results revealed that the charmonium masses <span>(psi (n^{3}S_{1}))</span> and <span>(eta _{c}(n^{1}S_{0}))</span> (<span>(n=2, 3,4,5,6))</span> and bottomonium masses (<span>(eta _{b}(n^{1}S_{0})))</span> and <span>(Upsilon (n^{3}S_{1}))</span> (<span>(n=2, 3, 4, 6))</span> for the <i>s</i>-wave quantum states are in good agreement with the results obtained by other methods in the existing literature and available experimental data. For <span>(l>0)</span>, the charmonia masses <span>(chi _{c_{j}}(n^{3}P_{j}))</span> <span>(psi _{1}left( {1^{3}D}_{1} right) )</span> and <span>(psi _{2}left( {2^{3}D}_{1} right) )</span> agreed with the works obtained using other potential models and observed data. In comparison to experimental data, the total absolute deviation error of 3.21% and 1.06% was obtained for the respective charmonium and bottomonium masses. The proposed potential model provides a satisfying account for the mass spectra of the heavy mesons and may be extended to study other spectroscopic parameters.\u0000</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"64 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4793659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Few-Body SystemsPub Date : 2023-07-16DOI: 10.1007/s00601-023-01851-8
Abdullah Guvendi, Semra Gurtas Dogan
{"title":"Fermion-Antifermion Pair Exposed to Magnetic Flux in an Optical Wormhole","authors":"Abdullah Guvendi, Semra Gurtas Dogan","doi":"10.1007/s00601-023-01851-8","DOIUrl":"10.1007/s00601-023-01851-8","url":null,"abstract":"<div><p>We introduce an exactly soluble model for a fermion-antifermion pair exposed to magnetic flux in the hyperbolic wormhole. This model is based on an analytical solution of the corresponding two-body Dirac equation. We show a non-perturbative wave equation for such a pair in exactly soluble form. This makes it possible to acquire a complete energy spectrum. Results clearly show the effects of the magnetic flux as well as the wormhole background on the dynamics of the considered pair and such a composite system may behave as a single fermion or a single boson by depending on the magnetic flux. This implies that one can control the dynamics of such a pair in an optical background with constant negative Gaussian curvature.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"64 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4650998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Few-Body SystemsPub Date : 2023-07-14DOI: 10.1007/s00601-023-01849-2
Sanjeeda Bharati Das, (for the Belle II Collaboration)
{"title":"Measurement of Charm Baryon Lifetimes at Belle II","authors":"Sanjeeda Bharati Das, (for the Belle II Collaboration)","doi":"10.1007/s00601-023-01849-2","DOIUrl":"10.1007/s00601-023-01849-2","url":null,"abstract":"<div><p>Outstanding vertexing performance and low-background environment are key enablers of a systematic Belle II program targeted at measurements of charm baryon lifetimes. Recent results from measurements of the <span>(varLambda _{c}^{+})</span> and <span>(varOmega _{c}^{0})</span> baryon lifetimes are presented. The former result is the most precise to date.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"64 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4576753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Few-Body SystemsPub Date : 2023-07-11DOI: 10.1007/s00601-023-01845-6
Yin-Zhen Xu, Jorge Segovia
{"title":"An Assessment of Pseudoscalar and Vector Meson Electromagnetic Form Factors","authors":"Yin-Zhen Xu, Jorge Segovia","doi":"10.1007/s00601-023-01845-6","DOIUrl":"10.1007/s00601-023-01845-6","url":null,"abstract":"<div><p>Within the framework of the Dyson-Schwinger/Bethe-Salpeter equations of quantum chromodynamics, we investigate the electromagnetic form factors of pseudoscalar and vector mesons with different hidden-flavor, from light to heavy quark sectors, and compare the results with those of the single-pole vector meson dominance (VMD) model. It is found that the charge radius of vector meson is larger than that of its pseudoscalar counterpart. As the current-quark mass increases, the electric form factor of the vector meson tends to approach that of its pseudoscalar counterpart, and gradually deviates from the prediction of the VMD model.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"64 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4464566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
{"title":"Experimental Study of In-medium Spectral Change of Vector Mesons at J-PARC","authors":"Kazuya Aoki, Daichi Arimizu, Sakiko Ashikaga, Wen-Chen Chang, Tatsuya Chujo, Kengo Ebata, Hideto En’yo, Shinichi Esumi, Hideki Hamagaki, Ryotaro Honda, Masaya Ichikawa, Shunsuke Kajikawa, Koki Kanno, Yuta Kimura, Akio Kiyomichi, Takehito K. Kondo, Shono Kyan, Che-Sheng Lin, Chih-Hsun Lin, Yuhei Morino, Hikari Murakami, Tomoki N. Murakami, Ryotaro Muto, Shunnosuke Nagafusa, Wataru Nakai, Satomi Nakasuga, Megumi Naruki, Toshihiro Nonaka, Hiroyuki Noumi, Shuta Ochiai, Kyoichiro Ozawa, Takao Sakaguchi, Hiroyuki Sako, Fuminori Sakuma, Susumu Sato, Shinya Sawada, Michiko Sekimoto, Kenta Shigaki, Kotaro Shirotori, Hitoshi Sugimura, Tomonori N. Takahashi, Yudai Takaura, Ryohei Tatsumi, Kosuke Tsukui, Po-Hung Wang, Kanta Yahiro, Kanako H. Yamaguchi, Satoshi Yokkaichi","doi":"10.1007/s00601-023-01828-7","DOIUrl":"10.1007/s00601-023-01828-7","url":null,"abstract":"<div><p>Chiral symmetry and its spontaneous breaking is an essential property of the QCD vacuum and is closely related to the generation of hadron mass. J-PARC E16 experiment measures dielectron spectra in p+A collisions at 30 GeV to study the in-medium spectral change of vector mesons that signals the partial restoration of the broken symmetry. The experiment uses the primary proton beam available at the high-momentum beam line of the J-PARC hadron experimental facility. We performed three proton-beam runs intended for beamline and detector commissioning. We are preparing for the next commissioning run in 2023 and the first physics run. We present the experimental setup, some of the expected results, preparation status, and some findings in the commissioning runs.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"64 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-023-01828-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4460736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Few-Body SystemsPub Date : 2023-07-10DOI: 10.1007/s00601-023-01822-z
William K. Brooks, Lamiaa El Fassi, Taya Chetry
{"title":"Exploring the Potential Role of Diquarks in Hadronization Using Semi-inclusive Deep Inelastic Scattering on Nuclear Targets","authors":"William K. Brooks, Lamiaa El Fassi, Taya Chetry","doi":"10.1007/s00601-023-01822-z","DOIUrl":"10.1007/s00601-023-01822-z","url":null,"abstract":"<div><p>Hadronization, which is the process by which an energetic colored quark evolves into a color-singlet hadron in Quantum Chromodynamics, can be studied both in small nuclei and large nuclei, and the comparison of the differences between those two systems provides information about the hadronization mechanisms on femtometer distance scales. It can be argued that this process is well understood for light meson production on nuclei, but data from HERMES and CLAS for baryon production present puzzling patterns that are not well described by models. Herein we suggest that this might be due to the presence of diquarks in the protons and neutrons making up these nuclei.\u0000</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"64 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-023-01822-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4729384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Few-Body SystemsPub Date : 2023-07-06DOI: 10.1007/s00601-023-01844-7
Toshikazu Hashimoto, LEPS2/BGOegg Collaboration
{"title":"Baryon Resonance Studies Via Meson Photoproduction in the LEPS2/BGOegg Experiment","authors":"Toshikazu Hashimoto, LEPS2/BGOegg Collaboration","doi":"10.1007/s00601-023-01844-7","DOIUrl":"10.1007/s00601-023-01844-7","url":null,"abstract":"<div><p>We present differential cross sections and photon beam asymmetries of photoproduction reactions of <span>(eta )</span> mesons in the center-of-mass energy of <span>(1.82< W < 2.32)</span> measured in LEPS2/BGOegg experiment. The differential cross section at <span>(cos {theta ^{eta }_{mathrm {c.m.}}} < -0.6)</span> shows a bump structure at <span>(W sim )</span> 2.2 GeV, suggesting the appearance of the baryon resonances with hidden <span>(sbar{s})</span>. The photon beam asymmetries at <span>(W>)</span> 2.1 GeV were measured for the first time.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"64 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-023-01844-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4257489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Few-Body SystemsPub Date : 2023-07-06DOI: 10.1007/s00601-023-01831-y
Fl. Stancu
{"title":"Hidden Bottom Pentaquark in the SU(5) Version of the Flavor-Spin Model","authors":"Fl. Stancu","doi":"10.1007/s00601-023-01831-y","DOIUrl":"10.1007/s00601-023-01831-y","url":null,"abstract":"<div><p>We generalize to five distinct flavors the flavor-spin hyperfine interaction introduced previously for four flavors and used in the study of <span>(uudc{overline{c}})</span> pentaquark. As a particular case here we study the lowest states of the pentaquark <span>(uudb{overline{b}})</span>, of either positive or negative parity, in a constituent quark model with linear confinement and the presently extended hyperfine interaction. The positive parity states have one unit of angular momentum located in the subsystem of four quarks and are described by translationally invariant states of orbital permutation symmetry <span>([31]_O)</span> which requires the configuration <span>(s^3 p)</span>. The negative parity states are described by the configuration <span>(s^4)</span> of permutation symmetry <span>([4]_O)</span>. We show that the lowest state has the quantum numbers <span>(J^P)</span> = <span>(1/2^+)</span> or <span>(3/2^+)</span> and I = 1/2 and is located below the <span>(Sigma _b B)</span> threshold by <span>(-)</span> 132 MeV. We present a comparison between the spectra of <span>(uudc{overline{c}})</span> and <span>(uudb{overline{b}})</span> pentaquarks.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"64 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-023-01831-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4257810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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