The European physical journal. A, Hadrons and nuclei最新文献

{"title":"<ArticleTitle xmlns:ns0=\"http://www.w3.org/1998/Math/MathML\">The baryon-baryon interaction in the large- <ns0:math><ns0:msub><ns0:mi>N</ns0:mi> <ns0:mi>c</ns0:mi></ns0:msub> </ns0:math> limit.","authors":"Thomas Vonk, Ulf-G Meißner","doi":"10.1140/epja/s10050-025-01602-9","DOIUrl":"10.1140/epja/s10050-025-01602-9","url":null,"abstract":"<p><p>We analyze the large- <math><msub><mi>N</mi> <mi>c</mi></msub> </math> structure of the baryon-baryon potential derived in the framework of SU(3) chiral perturbation theory up to next-to-leading order including contact interactions as well as one-meson and two-meson exchange diagrams. Moreover, we assess the impact of SU(3) symmetry breaking from a large- <math><msub><mi>N</mi> <mi>c</mi></msub> </math> perspective and show that the leading order results can successfully be applied to the hyperon-nucleon potential. Our results include a reduction of the number of relevant low-energy constants of the leading order contact interaction from fifteen to three, and we show that consistency is preserved if the <i>F</i>/<i>D</i> ratio is given by 2/3 and the <i>C</i>/<i>D</i> ratio for the baryon decuplet-to-octet coupling is given by 2.</p>","PeriodicalId":75005,"journal":{"name":"The European physical journal. A, Hadrons and nuclei","volume":"61 6","pages":"135"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12170797/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144328044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"<ArticleTitle xmlns:ns0=\"http://www.w3.org/1998/Math/MathML\"><ns0:math><ns0:mi>η</ns0:mi></ns0:math> , <ns0:math><ns0:msup><ns0:mi>η</ns0:mi> <ns0:mo>'</ns0:mo></ns0:msup> </ns0:math> mesons from lattice QCD in fully physical conditions.","authors":"Konstantin Ottnad, Simone Bacchio, Jacob Finkenrath, Bartosz Kostrzewa, Marcus Petschlies, Ferenc Pittler, Carsten Urbach, Urs Wenger","doi":"10.1140/epja/s10050-025-01635-0","DOIUrl":"https://doi.org/10.1140/epja/s10050-025-01635-0","url":null,"abstract":"&lt;p&gt;&lt;p&gt;We determine masses and mixing parameters of the &lt;math&gt;&lt;mi&gt;η&lt;/mi&gt;&lt;/math&gt; and &lt;math&gt;&lt;msup&gt;&lt;mi&gt;η&lt;/mi&gt; &lt;mo&gt;'&lt;/mo&gt;&lt;/msup&gt; &lt;/math&gt; meson in lattice QCD. The calculations are carried out on a set of 13 ETMC gauge ensembles with &lt;math&gt; &lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;N&lt;/mi&gt; &lt;mi&gt;f&lt;/mi&gt;&lt;/msub&gt; &lt;mo&gt;=&lt;/mo&gt; &lt;mn&gt;2&lt;/mn&gt; &lt;mo&gt;+&lt;/mo&gt; &lt;mn&gt;1&lt;/mn&gt; &lt;mo&gt;+&lt;/mo&gt; &lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt; &lt;/math&gt; (maximally) twisted-mass Clover-improved quarks. These ensemble cover four values of the lattice spacing &lt;math&gt;&lt;mrow&gt;&lt;mi&gt;a&lt;/mi&gt; &lt;mo&gt;=&lt;/mo&gt; &lt;mn&gt;0.057&lt;/mn&gt; &lt;mspace&gt;&lt;/mspace&gt; &lt;mtext&gt;fm&lt;/mtext&gt; &lt;mo&gt;,&lt;/mo&gt; &lt;mo&gt;…&lt;/mo&gt; &lt;mo&gt;,&lt;/mo&gt; &lt;mn&gt;0.092&lt;/mn&gt; &lt;mspace&gt;&lt;/mspace&gt; &lt;mtext&gt;fm&lt;/mtext&gt;&lt;/mrow&gt; &lt;/math&gt; and pion masses from 140 to &lt;math&gt;&lt;mrow&gt;&lt;mn&gt;360&lt;/mn&gt; &lt;mspace&gt;&lt;/mspace&gt; &lt;mtext&gt;MeV&lt;/mtext&gt;&lt;/mrow&gt; &lt;/math&gt; , including three ensembles at physical quark masses and six ensembles with &lt;math&gt; &lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;M&lt;/mi&gt; &lt;mi&gt;π&lt;/mi&gt;&lt;/msub&gt; &lt;mo&gt;&lt;&lt;/mo&gt; &lt;mn&gt;200&lt;/mn&gt; &lt;mspace&gt;&lt;/mspace&gt; &lt;mtext&gt;MeV&lt;/mtext&gt;&lt;/mrow&gt; &lt;/math&gt; . The strange-quark contribution is treated in a mixed-action approach using Osterwalder-Seiler fermions to avoid complications due to flavor mixing in the heavy quark sector and to enable the use of the one-end trick in the computation of strange quark-disconnected diagrams. With the strange-quark mass tuned to its physical value and several ensembles having close-to-physical light-quark mass, uncertainties related to the chiral extrapolations are reduced significantly compared to earlier studies. Physical results are computed with fully controlled systematics from a combined chiral, continuum and infinite-volume extrapolation, and a full error budget is obtained from model averages over of various fit ansätze and data cuts. Our results for the masses are given by &lt;math&gt; &lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;M&lt;/mi&gt; &lt;mi&gt;η&lt;/mi&gt;&lt;/msub&gt; &lt;mo&gt;=&lt;/mo&gt; &lt;mn&gt;551&lt;/mn&gt; &lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt; &lt;mn&gt;16&lt;/mn&gt; &lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt; &lt;mspace&gt;&lt;/mspace&gt; &lt;mtext&gt;MeV&lt;/mtext&gt;&lt;/mrow&gt; &lt;/math&gt; and &lt;math&gt; &lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;M&lt;/mi&gt; &lt;msup&gt;&lt;mi&gt;η&lt;/mi&gt; &lt;mo&gt;'&lt;/mo&gt;&lt;/msup&gt; &lt;/msub&gt; &lt;mo&gt;=&lt;/mo&gt; &lt;mn&gt;972&lt;/mn&gt; &lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt; &lt;mn&gt;20&lt;/mn&gt; &lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt; &lt;mspace&gt;&lt;/mspace&gt; &lt;mtext&gt;MeV&lt;/mtext&gt;&lt;/mrow&gt; &lt;/math&gt; , respectively, where statistical and systematic errors have been added in quadrature. For the mixing angle and decay-constant parameters the Feldmann-Kroll-Stech scheme is employed to compute them from pseudoscalar matrix elements in the quark-flavor basis. For the mixing angle we obtain &lt;math&gt; &lt;mrow&gt;&lt;msup&gt;&lt;mi&gt;ϕ&lt;/mi&gt; &lt;mtext&gt;phys&lt;/mtext&gt;&lt;/msup&gt; &lt;mo&gt;=&lt;/mo&gt; &lt;mn&gt;39.3&lt;/mn&gt; &lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt; &lt;mn&gt;2.0&lt;/mn&gt; &lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt; &lt;mo&gt;∘&lt;/mo&gt;&lt;/msup&gt; &lt;/mrow&gt; &lt;/math&gt; and our results for the decay-constant parameters are given by &lt;math&gt; &lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;f&lt;/mi&gt; &lt;mi&gt;l&lt;/mi&gt; &lt;mtext&gt;phys&lt;/mtext&gt;&lt;/msubsup&gt; &lt;mo&gt;=&lt;/mo&gt; &lt;mn&gt;138.6&lt;/mn&gt; &lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt; &lt;mn&gt;4.4&lt;/mn&gt; &lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt; &lt;mspace&gt;&lt;/mspace&gt; &lt;mtext&gt;MeV&lt;/mtext&gt;&lt;/mrow&gt; &lt;/math&gt; and &lt;math&gt; &lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;f&lt;/mi&gt; &lt;mi&gt;s&lt;/mi&gt; &lt;mtext&gt;phys&lt;/mtext&gt;&lt;/msubsup&gt; &lt;mo&gt;=&lt;/mo&gt; &lt;mn&gt;170.7&lt;/mn&gt; &lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt; &lt;mn&gt;3.3&lt;/mn&gt; &lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt; &lt;mspace&gt;&lt;/mspace&gt; &lt;mtext&gt;Me","PeriodicalId":75005,"journal":{"name":"The European physical journal. A, Hadrons and nuclei","volume":"61 7","pages":"169"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12283833/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy calibration of the 2.5 MV Pelletron at the Dalton Cumbrian Facility.","authors":"K Linkowski, R S Sidhu, J Skowronski, M Aliotta, P Black, T Davinson, M Wiescher, A Caciolli, J Jones, K Manukyan, D Robertson, A Smith","doi":"10.1140/epja/s10050-025-01622-5","DOIUrl":"https://doi.org/10.1140/epja/s10050-025-01622-5","url":null,"abstract":"<p><p>We report on the energy calibration of the 2.5 MV Pelletron accelerator at the Dalton Cumbrian Facility in England (UK) using five well-known resonances in the ²⁷Al(<i>p</i>, <math> <msup><mrow><mi>γ</mi> <mo>)</mo></mrow> <mn>28</mn></msup> </math> Si reaction in the proton beam energy range of 632-1800 keV. The beam energy spread was also measured and found to be 191(38) eV. Additionally, we checked the stability and reproducibility of the accelerator's beam energy, confirming its suitability for nuclear astrophysics experiments, especially in the high-energy regime of stellar evolution and nucleosynthesis.</p>","PeriodicalId":75005,"journal":{"name":"The European physical journal. A, Hadrons and nuclei","volume":"61 7","pages":"155"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12238158/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144610493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Systematics of stopping and flow in Au+ Au collisions","authors":"A. Andronic, J. Łukasik, W. Reisdorf, W. Trautmann","doi":"10.1007/978-3-540-46496-9_4","DOIUrl":"https://doi.org/10.1007/978-3-540-46496-9_4","url":null,"abstract":"","PeriodicalId":75005,"journal":{"name":"The European physical journal. A, Hadrons and nuclei","volume":"85 1","pages":"31-46"},"PeriodicalIF":0.0,"publicationDate":"2006-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84328280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiative electron capture --A tool to detect He++ in space","authors":"D. Chmielewska, Z. Sujkowski","doi":"10.1140/EPJA/I2006-08-051-4","DOIUrl":"https://doi.org/10.1140/EPJA/I2006-08-051-4","url":null,"abstract":"","PeriodicalId":75005,"journal":{"name":"The European physical journal. A, Hadrons and nuclei","volume":"5 1","pages":"333-335"},"PeriodicalIF":0.0,"publicationDate":"2006-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84542450","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":"AMS --A powerful tool for probing nucleosynthesis via long-lived radionuclides","authors":"A. Wallner, R. Golser, W. Kutschera, A. Priller, P. Steier, C. Vockenhuber","doi":"10.1140/EPJA/I2006-08-052-3","DOIUrl":"https://doi.org/10.1140/EPJA/I2006-08-052-3","url":null,"abstract":"","PeriodicalId":75005,"journal":{"name":"The European physical journal. A, Hadrons and nuclei","volume":"88 1","pages":"337-342"},"PeriodicalIF":0.0,"publicationDate":"2006-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76828025","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":"Testing of the RIKEN-ATOMKI CsI(Tl) array in the study of 22, 23O nuclear structure","authors":"Z. Elekes, Z. Dombrádi, S. Bishop, Z. Fülöp, J. Gibelin, T. Gomi, Y. Hashimoto, N. Imai, N. Iwasa, H. Iwasaki, G. Kalinka, Y. Kondo, A. Korsheninnikov, K. Kurita, M. Kurokawa, N. Matsui, T. Motobayashi, T. Nakamura, T. Nakao, E. Nikolskii, T. Ohnishi, T. Okumura, S. Ota, A. Perera, A. Saito, H. Sakurai, Y. Satou, D. Sohler, T. Sumikama, D. Suzuki, M. Suzuki, H. Takeda, S. Takeuchi, Y. Togano, Y. Yanagisawa","doi":"10.1140/EPJA/I2006-08-049-X","DOIUrl":"https://doi.org/10.1140/EPJA/I2006-08-049-X","url":null,"abstract":"","PeriodicalId":75005,"journal":{"name":"The European physical journal. A, Hadrons and nuclei","volume":"115 1","pages":"321-324"},"PeriodicalIF":0.0,"publicationDate":"2006-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78689870","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":"Nuclear astrophysics at the east drip line","authors":"S. Kubono, T. Teranishi, M. Notani, H. Yamaguchi, A. Saito, J. He, Y. Wakabayashi, H. Fujikawa, G. Amadio, H. Baba, T. Fukuchi, S. Shimoura, S. Michimasa, S. Nishimura, M. Nishimura, Y. Gono, A. Odahara, S. Kato, J. Moon, J. H. Lee, Y. Kwon, C. S. Lee, K. Hahn, Z. Fülöp, V. Guimar aes, R. Lichtenthaler","doi":"10.1140/EPJA/I2006-08-050-5","DOIUrl":"https://doi.org/10.1140/EPJA/I2006-08-050-5","url":null,"abstract":"","PeriodicalId":75005,"journal":{"name":"The European physical journal. A, Hadrons and nuclei","volume":"144 1","pages":"327-332"},"PeriodicalIF":0.0,"publicationDate":"2006-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89369434","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":"Big bang nucleosynthesis in the new cosmology","authors":"B. Fields","doi":"10.1063/1.2870312","DOIUrl":"https://doi.org/10.1063/1.2870312","url":null,"abstract":"Abstract.Big bang nucleosynthesis (BBN) describes the production of the lightest elements in the first minutes of cosmic time. We review the physics of cosmological element production, and the observations of the primordial element abundances. The comparison between theory and observation has heretofore provided our earliest probe of the universe, and given the best measure of the cosmic baryon content. However, BBN has now taken a new role in cosmology, in light of new precision measurements of the cosmic microwave background (CMB). Recent CMB anisotropy data yield a wealth of cosmological parameters; in particular, the baryon-to-photon ratio η = nB/nγ is measured to high precision. The confrontation between the BBN and CMB “baryometers” poses a new and stringent test of the standard cosmology; the status of this test is discussed. Moreover, it is now possible to recast the role of BBN by using the CMB to fix the baryon density and even some light element abundances. This strategy sharpens BBN into a more powerful probe of early universe physics, and of galactic nucleosynthesis processes. The impact of the CMB results on particle physics beyond the Standard Model, and on non-standard cosmology, are illustrated. Prospects for improvement of these bounds via additional astronomical observations and nuclear experiments are discussed, as is the lingering “lithium problem.”","PeriodicalId":75005,"journal":{"name":"The European physical journal. A, Hadrons and nuclei","volume":"401 1","pages":"3-14"},"PeriodicalIF":0.0,"publicationDate":"2006-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74339012","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":"Parity-violating electron scattering at the MAMI facility in Mainz","authors":"F. Maas","doi":"10.1142/9789812706881_0052","DOIUrl":"https://doi.org/10.1142/9789812706881_0052","url":null,"abstract":"Abstract.A measurement of the weak form factor of the proton allows a separation of the strangeness contribution to the electromagnetic form factors. The weak form factor is accessed experimentally by the measurement of a parity violating (PV) asymmetry in the scattering of polarized electrons on unpolarized protons. We performed such measurements with the setup of the A4-experiment at the MAMI accelerator facility in Mainz. The role of strangeness in low energy nonperturbative QCD is discussed. The A4-experiment is presented as well as the results on the strangeness form factors which have been measured at two Q2-values. The plans for backward angle measurements at the MAMI facility are presented.","PeriodicalId":75005,"journal":{"name":"The European physical journal. A, Hadrons and nuclei","volume":"45 1","pages":"107-115"},"PeriodicalIF":0.0,"publicationDate":"2006-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87540879","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}