The European Physical Journal A最新文献

{"title":"Possible structure of (T_{cbar{s}0}(2900)^{++})","authors":"Bing-Dong Wan,&nbsp;Ya-Ru Wang","doi":"10.1140/epja/s10050-024-01388-2","DOIUrl":"10.1140/epja/s10050-024-01388-2","url":null,"abstract":"<div><p>Recently, a hadronic state, named <span>(T_{cbar{s}0}(2900)^{++})</span>, about 2.92 GeV with <span>(J^{P}=0^{+})</span> was observed in LHCb experiment. It is the first observation of a doubly charged open-charm tetraquark with minimal quark constant <span>([cbar{s}ubar{d}])</span>, and hence has a peculiar importance. In this paper, we examine the diquark-antidiquark interpretation for the structure of <span>(T_{cbar{s}0}(2900)^{++})</span> in the configurations of <span>([3_c]_{bar{s}bar{d}}otimes [bar{3}_c]_{cu})</span> in the framework of QCD sum rules up to dimension 8 condensate in the operator product expansion. Numerical results indicated that the observed <span>(T_{cbar{s}0}(2900)^{++})</span> could be embedded into the <span>([3_c]_{bar{s}bar{d}}otimes [bar{3}_c]_{cu})</span> configuration. Furthermore, another doubly charged open-charm tetraquark in diquark-antidiquark configuration with mass about 3.13 GeV is also predicted, which are hopefully measurable in BESIII, BEllEII, and LHCb experiments.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 9","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"(U_A(1)) symmetry-breaking quark interactions from vacuum polarization","authors":"Fabio L. Braghin","doi":"10.1140/epja/s10050-024-01390-8","DOIUrl":"10.1140/epja/s10050-024-01390-8","url":null,"abstract":"<div><p>By considering the one-loop background field method for a quark–antiquark interaction, mediated by one (non-perturbative) gluon exchange, sixth-order quark effective interactions are derived and investigated in the limit of zero momentum transfer for large quark and/or gluon effective masses. They extend fourth-order quark interactions worked out in previous works of the author. These interactions break <span>(U_A(1))</span> symmetry and may be either momentum-independent or momentum-dependent. Some of these interactions vanish in the limit of massless quarks, and several others—involving vector and/or axial quark currents—survive. In the local limit of the resulting interactions, some phenomenological implications are presented, which correspond to corrections to the Nambu–Jona–Lasinio model. By means of the auxiliary field method, the local interactions give rise to three meson interactions whose values are compared to phenomenological values found in the literature. Contributions for meson-mixing parameters are calculated and compared to available results.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 9","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Graph algorithms with neutral atom quantum processors","authors":"Constantin Dalyac,&nbsp;Lucas Leclerc,&nbsp;Louis Vignoli,&nbsp;Mehdi Djellabi,&nbsp;Wesley da Silva Coelho,&nbsp;Bruno Ximenez,&nbsp;Alexandre Dareau,&nbsp;Davide Dreon,&nbsp;Vincent E. Elfving,&nbsp;Adrien Signoles,&nbsp;Louis-Paul Henry,&nbsp;Loïc Henriet","doi":"10.1140/epja/s10050-024-01385-5","DOIUrl":"10.1140/epja/s10050-024-01385-5","url":null,"abstract":"<div><p>Neutral atom technology has steadily demonstrated significant theoretical and experimental advancements, positioning itself as a front-runner platform for running quantum algorithms. One unique advantage of this technology lies in the ability to reconfigure the geometry of the qubit register, from shot to shot. This unique feature makes possible the native embedding of graph-structured problems at the hardware level, with profound consequences for the resolution of complex optimization and machine learning tasks. By driving qubits, one can generate processed quantum states which retain graph complex properties. These states can then be leveraged to offer direct solutions to problems or as resources in hybrid quantum-classical schemes. In this paper, we review the advancements in quantum algorithms for graph problems running on neutral atom Quantum Processing Units (QPUs), and discuss recently introduced embedding and problem-solving techniques. In addition, we clarify ongoing advancements in hardware, with an emphasis on enhancing the scalability, controllability and computation repetition rate of neutral atom QPUs.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 9","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Single-neutron adding on (^{34})S","authors":"A. N. Kuchera,&nbsp;C. R. Hoffman,&nbsp;G. Ryan,&nbsp;I. B. D’Amato,&nbsp;O. M. Guarinello,&nbsp;P. S. Kielb,&nbsp;R. Aggarwal,&nbsp;S. Ajayi,&nbsp;A. L. Conley,&nbsp;I. Conroy,&nbsp;P. D. Cottle,&nbsp;J. C. Esparza,&nbsp;S. Genty,&nbsp;K. Hanselman,&nbsp;M. Heinze,&nbsp;D. Houlihan,&nbsp;B. Kelly,&nbsp;M. I. Khawaja,&nbsp;E. Lopez-Saavedra,&nbsp;G. W. McCann,&nbsp;A. B. Morelock,&nbsp;L. A. Riley,&nbsp;A. Sandrik,&nbsp;V. Sitaraman,&nbsp;M. Spieker,&nbsp;E. Temanson,&nbsp;C. Wibisono,&nbsp;I. Wiedenhöver","doi":"10.1140/epja/s10050-024-01399-z","DOIUrl":"10.1140/epja/s10050-024-01399-z","url":null,"abstract":"<div><p>Single-neutron adding data was collected in order to determine the distribution of the single-neutron strength of the <span>(0f_{7/2})</span>, <span>(1p_{3/2})</span>, <span>(1p_{1/2})</span> and <span>(0f_{5/2})</span> orbitals outside of <span>(Z=16, N=18)</span>, <span>(^{34})</span>S. The <span>(^{34})</span>S(<i>d</i>,<i>p</i>)<span>(^{35})</span>S reaction has been measured at 8 MeV/u to investigate cross sections to excited states in <span>(^{35})</span>S. Outgoing proton yields and momenta were analyzed by the Super-Enge Split-Pole Spectrograph in conjunction with the CeBrA demonstrator located at the John D. Fox Laboratory at Florida State University. Angular distributions were compared with Distorted Wave Born Approximation calculations in order to extract single-neutron spectroscopic overlaps. Spectroscopic overlaps and strengths were determined for states in <span>(^{35})</span>S up through 6 MeV in excitation energy. Each orbital was observed to have fragmented strength where a single level carried the majority. The single-neutron centroids of the <span>(0f_{7/2})</span>, <span>(1p_{3/2})</span>, <span>(1p_{1/2})</span> and <span>(0f_{5/2})</span> orbitals were determined to be <span>(2360^{+90}_{-40})</span> keV, <span>(3280^{+80}_{-50})</span> keV, <span>(4780^{+60}_{-40})</span> keV, and <span>(gtrsim 7500)</span> keV, respectively. A previous discrepancy in the literature with respect to the distribution of the neutron <span>(1p_{1/2})</span> strength was resolved. The integration of the normalized spectroscopic strengths, up to 5.1 MeV in excitation energy, revealed fully-vacant occupancies for the <span>(0f_{7/2})</span>, <span>(1p_{3/2})</span>, and <span>(1p_{1/2})</span> orbitals, as expected. The spacing in the single-neutron energies highlighted a reduction in the traditional <span>(N=28)</span> shell-gap, relative to both the 1<i>p</i> spin-orbit energy difference (<span>(N=32)</span>) and the lower limit on the <span>(N=34)</span> shell spacing.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 9","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Structure and astrophysical role of the neutron-rich (55 le Z le 92) isotopes: status and perspectives","authors":"Gábor Gyula Kiss,&nbsp;Zsolt Podolyák","doi":"10.1140/epja/s10050-024-01389-1","DOIUrl":"10.1140/epja/s10050-024-01389-1","url":null,"abstract":"<div><p>Heavy neutron-rich nuclei are of great interest. Phenomena like shell evolution (<span>(Nsim 126)</span>, <span>(Zsim 82)</span>), prolate–triaxial–oblate–spherical shape evolution (<span>(Z=)</span> 70–80), possible deformed shell closures or structure change in the rare-earth region are under intense scrutiny. This latter is closely linked to the rare-earth <i>r</i>-process peak, while the <span>(N sim 126)</span> nuclei are connected to the third <i>r</i>-process peak at <span>(A sim 195)</span>. Recent technical developments (e.g. increasing beam intensities at fragmentation facilities, new detection systems) provided huge amount of new experimental data, published in the last decade, allowing to probe structure and astrophysical models. Experimental methods and recent results are reviewed and future opportunities discussed.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 9","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01389-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"THSR wave function and non-localized clustering","authors":"Hisashi Horiuchi,&nbsp;David Blaschke","doi":"10.1140/epja/s10050-024-01319-1","DOIUrl":"10.1140/epja/s10050-024-01319-1","url":null,"abstract":"<div><p>The main ideas to construct the THSR wave function are given, and the relation to other approaches such as the Brink-type cluster wave function approach is shown. The effect of the Pauli-forbidden states on the inter-cluster potential is described by the orthogonality condition model. The duality of the cluster structure and shell-model structure for nuclei in the ground state and in excited states is discussed. Future work on <span>(n alpha )</span> condensate states in more complex nuclei and the formation of cluster structures in excited nuclei is outlined.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 9","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01319-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Strong interaction physics at the luminosity frontier with 22 GeV electrons at Jefferson Lab","authors":"A. Accardi,&nbsp;P. Achenbach,&nbsp;D. Adhikari,&nbsp;A. Afanasev,&nbsp;C. S. Akondi,&nbsp;N. Akopov,&nbsp;M. Albaladejo,&nbsp;H. Albataineh,&nbsp;M. Albrecht,&nbsp;B. Almeida-Zamora,&nbsp;M. Amaryan,&nbsp;D. Androić,&nbsp;W. Armstrong,&nbsp;D. S. Armstrong,&nbsp;M. Arratia,&nbsp;J. Arrington,&nbsp;A. Asaturyan,&nbsp;A. Austregesilo,&nbsp;H. Avakian,&nbsp;T. Averett,&nbsp;C. Ayerbe Gayoso,&nbsp;A. Bacchetta,&nbsp;A. B. Balantekin,&nbsp;N. Baltzell,&nbsp;L. Barion,&nbsp;P. C. Barry,&nbsp;A. Bashir,&nbsp;M. Battaglieri,&nbsp;V. Bellini,&nbsp;I. Belov,&nbsp;O. Benhar,&nbsp;B. Benkel,&nbsp;F. Benmokhtar,&nbsp;W. Bentz,&nbsp;V. Bertone,&nbsp;H. Bhatt,&nbsp;A. Bianconi,&nbsp;L. Bibrzycki,&nbsp;R. Bijker,&nbsp;D. Binosi,&nbsp;D. Biswas,&nbsp;M. Boër,&nbsp;W. Boeglin,&nbsp;S. A. Bogacz,&nbsp;M. Boglione,&nbsp;M. Bondí,&nbsp;E. E. Boos,&nbsp;P. Bosted,&nbsp;G. Bozzi,&nbsp;E. J. Brash,&nbsp;R. A. Briceño,&nbsp;P. D. Brindza,&nbsp;W. J. Briscoe,&nbsp;S. J. Brodsky,&nbsp;W. K. Brooks,&nbsp;V. D. Burkert,&nbsp;A. Camsonne,&nbsp;T. Cao,&nbsp;L. S. Cardman,&nbsp;D. S. Carman,&nbsp;M. Carpinelli,&nbsp;G. D. Cates,&nbsp;J. Caylor,&nbsp;A. Celentano,&nbsp;F. G. Celiberto,&nbsp;M. Cerutti,&nbsp;L. Chang,&nbsp;P. Chatagnon,&nbsp;C. Chen,&nbsp;J.-P. Chen,&nbsp;T. Chetry,&nbsp;A. Christopher,&nbsp;E. Christy,&nbsp;E. Chudakov,&nbsp;E. Cisbani,&nbsp;I. C. Cloët,&nbsp;J. J. Cobos-Martinez,&nbsp;E. O. Cohen,&nbsp;P. Colangelo,&nbsp;P. L. Cole,&nbsp;M. Constantinou,&nbsp;M. Contalbrigo,&nbsp;G. Costantini,&nbsp;W. Cosyn,&nbsp;C. Cotton,&nbsp;A. Courtoy,&nbsp;S. Covrig Dusa,&nbsp;V. Crede,&nbsp;Z.-F. Cui,&nbsp;A. D’Angelo,&nbsp;M. Döring,&nbsp;M. M. Dalton,&nbsp;I. Danilkin,&nbsp;M. Davydov,&nbsp;D. Day,&nbsp;F. De Fazio,&nbsp;M. De Napoli,&nbsp;R. De Vita,&nbsp;D. J. Dean,&nbsp;M. Defurne,&nbsp;W. de Paula,&nbsp;G. F. de Téramond,&nbsp;A. Deur,&nbsp;B. Devkota,&nbsp;S. Dhital,&nbsp;P. Di Nezza,&nbsp;M. Diefenthaler,&nbsp;S. Diehl,&nbsp;C. Dilks,&nbsp;M. Ding,&nbsp;C. Djalali,&nbsp;S. Dobbs,&nbsp;R. Dupré,&nbsp;D. Dutta,&nbsp;R. G. Edwards,&nbsp;H. Egiyan,&nbsp;L. Ehinger,&nbsp;G. Eichmann,&nbsp;M. Elaasar,&nbsp;L. Elouadrhiri,&nbsp;A. El Alaoui,&nbsp;L. El Fassi,&nbsp;A. Emmert,&nbsp;M. Engelhardt,&nbsp;R. Ent,&nbsp;D. J. Ernst,&nbsp;P. Eugenio,&nbsp;G. Evans,&nbsp;C. Fanelli,&nbsp;S. Fegan,&nbsp;C. Fernández-Ramírez,&nbsp;L. A. Fernandez,&nbsp;I. P. Fernando,&nbsp;A. Filippi,&nbsp;C. S. Fischer,&nbsp;C. Fogler,&nbsp;N. Fomin,&nbsp;L. Frankfurt,&nbsp;T. Frederico,&nbsp;A. Freese,&nbsp;Y. Fu,&nbsp;L. Gamberg,&nbsp;L. Gan,&nbsp;F. Gao,&nbsp;H. Garcia-Tecocoatzi,&nbsp;D. Gaskell,&nbsp;A. Gasparian,&nbsp;K. Gates,&nbsp;G. Gavalian,&nbsp;P. K. Ghoshal,&nbsp;A. Giachino,&nbsp;F. Giacosa,&nbsp;F. Giannuzzi,&nbsp;G.-P. Gilfoyle,&nbsp;F.-X. Girod,&nbsp;D. I. Glazier,&nbsp;C. Gleason,&nbsp;S. Godfrey,&nbsp;J. L. Goity,&nbsp;A. A. Golubenko,&nbsp;S. Gonzàlez-Solís,&nbsp;R. W. Gothe,&nbsp;Y. Gotra,&nbsp;K. Griffioen,&nbsp;O. Grocholski,&nbsp;B. Grube,&nbsp;P. Guèye,&nbsp;F.-K. Guo,&nbsp;Y. Guo,&nbsp;L. Guo,&nbsp;T. J. Hague,&nbsp;N. Hammoud,&nbsp;J.-O. Hansen,&nbsp;M. Hattawy,&nbsp;F. Hauenstein,&nbsp;T. Hayward,&nbsp;D. Heddle,&nbsp;N. Heinrich,&nbsp;O. Hen,&nbsp;D. W. Higinbotham,&nbsp;I. M. Higuera-Angulo,&nbsp;A. N. Hiller Blin,&nbsp;A. Hobart,&nbsp;T. Hobbs,&nbsp;D. E. Holmberg,&nbsp;T. Horn,&nbsp;P. Hoyer,&nbsp;G. M. Huber,&nbsp;P. Hurck,&nbsp;P. T. P. Hutauruk,&nbsp;Y. Ilieva,&nbsp;I. Illari,&nbsp;D. G. Ireland,&nbsp;E. L. Isupov,&nbsp;A. Italiano,&nbsp;I. Jaegle,&nbsp;N. S. Jarvis,&nbsp;D. J. Jenkins,&nbsp;S. Jeschonnek,&nbsp;C.-R. Ji,&nbsp;H. S. Jo,&nbsp;M. Jones,&nbsp;R. T. Jones,&nbsp;D. C. Jones,&nbsp;K. Joo,&nbsp;M. Junaid,&nbsp;T. Kageya,&nbsp;N. Kalantarians,&nbsp;A. Karki,&nbsp;G. Karyan,&nbsp;A. T. Katramatou,&nbsp;S. J. D. Kay,&nbsp;R. Kazimi,&nbsp;C. D. Keith,&nbsp;C. Keppel,&nbsp;A. Kerbizi,&nbsp;V. Khachatryan,&nbsp;A. Khanal,&nbsp;M. Khandaker,&nbsp;A. Kim,&nbsp;E. R. Kinney,&nbsp;M. Kohl,&nbsp;A. Kotzinian,&nbsp;B. T. Kriesten,&nbsp;V. Kubarovsky,&nbsp;B. Kubis,&nbsp;S. E. Kuhn,&nbsp;V. Kumar,&nbsp;T. Kutz,&nbsp;M. Leali,&nbsp;R. F. Lebed,&nbsp;P. Lenisa,&nbsp;L. Leskovec,&nbsp;S. Li,&nbsp;X. Li,&nbsp;J. Liao,&nbsp;H.-W. Lin,&nbsp;L. Liu,&nbsp;S. Liuti,&nbsp;N. Liyanage,&nbsp;Y. Lu,&nbsp;I. J. D. MacGregor,&nbsp;D. J. Mack,&nbsp;L. Maiani,&nbsp;K. A. Mamo,&nbsp;G. Mandaglio,&nbsp;C. Mariani,&nbsp;P. Markowitz,&nbsp;H. Marukyan,&nbsp;V. Mascagna,&nbsp;V. Mathieu,&nbsp;J. Maxwell,&nbsp;M. Mazouz,&nbsp;M. McCaughan,&nbsp;R. D. McKeown,&nbsp;B. McKinnon,&nbsp;D. Meekins,&nbsp;W. Melnitchouk,&nbsp;A. Metz,&nbsp;C. A. Meyer,&nbsp;Z.-E. Meziani,&nbsp;C. Mezrag,&nbsp;R. Michaels,&nbsp;G. A. Miller,&nbsp;T. Mineeva,&nbsp;A. S. Miramontes,&nbsp;M. Mirazita,&nbsp;K. Mizutani,&nbsp;A. Mkrtchyan,&nbsp;H. Mkrtchyan,&nbsp;B. Moffit,&nbsp;P. Mohanmurthy,&nbsp;V. I. Mokeev,&nbsp;P. Monaghan,&nbsp;G. Montaña,&nbsp;R. Montgomery,&nbsp;A. Moretti,&nbsp;J. M. Morgado Chàvez,&nbsp;U. Mosel,&nbsp;A. Movsisyan,&nbsp;P. Musico,&nbsp;S. A. Nadeeshani,&nbsp;P. M. Nadolsky,&nbsp;S. X. Nakamura,&nbsp;J. Nazeer,&nbsp;A. V. Nefediev,&nbsp;K. Neupane,&nbsp;D. Nguyen,&nbsp;S. Niccolai,&nbsp;I. Niculescu,&nbsp;G. Niculescu,&nbsp;E. R. Nocera,&nbsp;M. Nycz,&nbsp;F. I. Olness,&nbsp;P. G. Ortega,&nbsp;M. Osipenko,&nbsp;E. Pace,&nbsp;B. Pandey,&nbsp;P. Pandey,&nbsp;Z. Papandreou,&nbsp;J. Papavassiliou,&nbsp;L. L. Pappalardo,&nbsp;G. Paredes-Torres,&nbsp;R. Paremuzyan,&nbsp;S. Park,&nbsp;B. Parsamyan,&nbsp;K. D. Paschke,&nbsp;B. Pasquini,&nbsp;E. Passemar,&nbsp;E. Pasyuk,&nbsp;T. Patel,&nbsp;C. Paudel,&nbsp;S. J. Paul,&nbsp;J.-C. Peng,&nbsp;L. Pentchev,&nbsp;R. Perrino,&nbsp;R. J. Perry,&nbsp;K. Peters,&nbsp;G. G. Petratos,&nbsp;W. Phelps,&nbsp;E. Piasetzky,&nbsp;A. Pilloni,&nbsp;B. Pire,&nbsp;D. Pitonyak,&nbsp;M. L. Pitt,&nbsp;A. D. Polosa,&nbsp;M. Pospelov,&nbsp;A. C. Postuma,&nbsp;J. Poudel,&nbsp;L. Preet,&nbsp;S. Prelovsek,&nbsp;J. W. Price,&nbsp;A. Prokudin,&nbsp;A. J. R. Puckett,&nbsp;J. R. Pybus,&nbsp;S.-X. Qin,&nbsp;J.-W. Qiu,&nbsp;M. Radici,&nbsp;H. Rashidi,&nbsp;A. D. Rathnayake,&nbsp;B. A. Raue,&nbsp;T. Reed,&nbsp;P. E. Reimer,&nbsp;J. Reinhold,&nbsp;J.-M. Richard,&nbsp;M. Rinaldi,&nbsp;F. Ringer,&nbsp;M. Ripani,&nbsp;J. Ritman,&nbsp;J. Rittenhouse West,&nbsp;A. Rivero-Acosta,&nbsp;C. D. Roberts,&nbsp;A. Rodas,&nbsp;S. Rodini,&nbsp;J. Rodríguez-Quintero,&nbsp;T. C. Rogers,&nbsp;J. Rojo,&nbsp;P. Rossi,&nbsp;G. C. Rossi,&nbsp;G. Salmè,&nbsp;S. N. Santiesteban,&nbsp;E. Santopinto,&nbsp;M. Sargsian,&nbsp;N. Sato,&nbsp;S. Schadmand,&nbsp;A. Schmidt,&nbsp;S. M. Schmidt,&nbsp;G. Schnell,&nbsp;R. A. Schumacher,&nbsp;P. Schweitzer,&nbsp;I. Scimemi,&nbsp;K. C. Scott,&nbsp;D. A. Seay,&nbsp;J. Segovia,&nbsp;K. Semenov-Tian-Shansky,&nbsp;A. Seryi,&nbsp;A. S. Sharda,&nbsp;M. R. Shepherd,&nbsp;E. V. Shirokov,&nbsp;S. Shrestha,&nbsp;U. Shrestha,&nbsp;V. I. Shvedunov,&nbsp;A. Signori,&nbsp;K. J. Slifer,&nbsp;W. A. Smith,&nbsp;A. Somov,&nbsp;P. Souder,&nbsp;N. Sparveris,&nbsp;F. Spizzo,&nbsp;M. Spreafico,&nbsp;S. Stepanyan,&nbsp;J. R. Stevens,&nbsp;I. I. Strakovsky,&nbsp;S. Strauch,&nbsp;M. Strikman,&nbsp;S. Su,&nbsp;B. C. L. Sumner,&nbsp;E. Sun,&nbsp;M. Suresh,&nbsp;C. Sutera,&nbsp;E. S. Swanson,&nbsp;A. P. Szczepaniak,&nbsp;P. Sznajder,&nbsp;H. Szumila-Vance,&nbsp;L. Szymanowski,&nbsp;A.-S. Tadepalli,&nbsp;V. Tadevosyan,&nbsp;B. Tamang,&nbsp;V. V. Tarasov,&nbsp;A. Thiel,&nbsp;X.-B. Tong,&nbsp;R. Tyson,&nbsp;M. Ungaro,&nbsp;G. M. Urciuoli,&nbsp;A. Usman,&nbsp;A. Valcarce,&nbsp;S. Vallarino,&nbsp;C. A. Vaquera-Araujo,&nbsp;L. Venturelli,&nbsp;F. Vera,&nbsp;A. Vladimirov,&nbsp;A. Vossen,&nbsp;J. Wagner,&nbsp;X. Wei,&nbsp;L. B. Weinstein,&nbsp;C. Weiss,&nbsp;R. Williams,&nbsp;D. Winney,&nbsp;B. Wojtsekhowski,&nbsp;M. H. Wood,&nbsp;T. Xiao,&nbsp;S.-S. Xu,&nbsp;Z. Ye,&nbsp;C. Yero,&nbsp;C.-P. Yuan,&nbsp;M. Yurov,&nbsp;N. Zachariou,&nbsp;Z. Zhang,&nbsp;Y. Zhao,&nbsp;Z. W. Zhao,&nbsp;X. Zheng,&nbsp;X. Zhou,&nbsp;V. Ziegler,&nbsp;B. Zihlmann","doi":"10.1140/epja/s10050-024-01282-x","DOIUrl":"10.1140/epja/s10050-024-01282-x","url":null,"abstract":"","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 9","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Investigating fusion attributes in (^{30}hbox {Si+}^{140}hbox {Ce}) reaction around the barrier","authors":"Malvika Sagwal,&nbsp;Moumita Maiti,&nbsp;Rishabh Kumar,&nbsp;Pavneet Kaur,&nbsp;Ankur Singh,&nbsp;Himanshu Sharma,&nbsp;Yasir Arafat,&nbsp;Chandra Kumar,&nbsp; Gonika,&nbsp;J. Gehlot,&nbsp;S. Nath,&nbsp;N. Madhavan","doi":"10.1140/epja/s10050-024-01394-4","DOIUrl":"10.1140/epja/s10050-024-01394-4","url":null,"abstract":"<div><p>In heavy-ion collision experiments, the fusion cross section in the sub-barrier energy region is found to be enhanced by several orders of magnitude in comparison to the prediction of the one-dimensional barrier penetration model (1D-BPM) that involves the quantum mechanical tunneling effect during fusion. So far, the coupling-aided tunneling due to participating nuclei’s intrinsic degrees of freedom continues to be identified as an accountable factor. We intend to probe the role of structural properties and low-lying inelastic excitations of the colliding nuclei in driving the fusion phenomenon for energies in the near and sub-barrier regions. In the study, the fusion excitation function has been measured for <span>(^{30}hbox {Si+}^{140}hbox {Ce})</span> reaction for energies <span>(approx )</span> 11% below to 13% above the Coulomb barrier. The measured fusion cross section is found to be noticeably enhanced in the sub-barrier region compared to the corresponding 1D-BPM prediction. The coupled-channel (CC) formalism in the <span>ccfull</span> framework has been employed to interpret the aforementioned intricate processes involved in fusion. The present results have been compared with those of a few nearby mass systems to understand different aspects of channel coupling in heavy-ion fusion.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 9","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Large (N_c) QCD phase diagram at (mu _B=0)","authors":"T. D. Cohen,&nbsp;L. Ya Glozman","doi":"10.1140/epja/s10050-024-01400-9","DOIUrl":"10.1140/epja/s10050-024-01400-9","url":null,"abstract":"<div><p>Lattice studies suggest that at zero baryon chemical potential and increasing temperature there are three characteristic regimes in QCD that are connected by smooth analytical crossovers: a hadron gas regime at <span>(T &lt; T_{ch}sim 155)</span> MeV, an intermediate regime, called stringy fluid, at <span>(T_{ch}&lt; T &lt; sim 3 T_{ch})</span>, and a quark-gluon plasma regime at higher temperatures. These regimes have been interpreted to reflect different approximate symmetries and effective degrees of freedom. In the hadron gas the effective degrees of freedom are hadrons and the approximate chiral symmetry of QCD is spontaneously broken. The intermediate regime has been interpreted as lacking spontaneous chiral symmetry breaking along with the emergence of new approximate symmetry, chiral spin symmetry, that is not a symmetry of the Dirac Lagrangian, but is a symmetry of the confining part of the QCD Lagrangian. While the high temperature regime is the usual quark-gluon plasma which is often considered to reflect “deconfinement” in some way. This paper explores the behavior of these regimes of QCD as the number of colors in the theory, <span>(N_c)</span>, gets large. In the large <span>(N_c)</span> limit the theory is center-symmetric and notions of confinement and deconfinement are unambiguous. The energy density is <span>(mathcal{O}(N_c^0))</span> in the meson gas, <span>({{mathcal {O}}}(N_c^1))</span> in the intermediate regime and <span>({{mathcal {O}}}(N_c^2))</span> in the quark-gluon plasma regime. In the large <span>(N_c)</span> limit these regimes may become distinct phases separated by first order phase transitions. The intermediate phase has the peculiar feature that glueballs should exist and have properties that are unchanged from what is seen in the vacuum (up to <span>(1/N_c )</span> corrections), while the ordinary dilute gas of mesons with broken chiral symmetry disappears and approximate chiral spin symmetry should emerge.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 9","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01400-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"On interpretation of fluctuations of conserved charges at high T","authors":"T. D. Cohen,&nbsp;L. Ya. Glozman","doi":"10.1140/epja/s10050-024-01387-3","DOIUrl":"10.1140/epja/s10050-024-01387-3","url":null,"abstract":"<div><p>Fluctuations of conserved charges calculated on the lattice which can be measured experimentally, are well reproduced by a hadron resonanse gas model at temperatures below <span>(T_{ch} sim 155)</span> MeV and radically deviate from the hadron resonance gas predictions above the chiral restoration crossover. This behaviour is typically interpreted as an indication of deconfinement in the quark-gluon plasma regime. We present an argument that this interpretation may be too simple. The argument is based on the scaling of quantities with the number of colors: demonstration of deconfinement and QGP requires observable that is sensitive to <span>(sim N_c^2)</span> gluons while the conserved charges are sensitive only to quarks and above <span>(T_{ch})</span> scale as <span>(N_c^1)</span>. The latter scaling is consistent with the existence of an intermediate regime characterized by restored chiral symmetry and by approximate chiral spin symmetry which is a symmetry of confining interaction. In this regime the energy density, pressure and entropy density scale as <span>(N_c^1)</span>. In the large <span>(N_c)</span> limit this regime might become a distinct phase separated from the hadron gas and from QGP by phase transitions. A natural observable that associates with deconfinement and is directly sensitive to deconfined <span>(N_c^2-1)</span> gluons is the Polyakov loop; in the <span>(N_c=3)</span> world it remains very close to 0 at temperatures well above chiral crossover, reaches the value <span>(sim 0.5)</span> around <span>(sim 3T_{ch})</span> and the value close to 1 at temperatures <span>(sim 1)</span> GeV.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01387-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}