{"title":"Investigating the (mathbf {text {p--}uppi ^{pm }}) and (mathbf {text {p--p--}uppi ^{pm }}) dynamics with femtoscopy in pp collisions at (mathbf {sqrt{textit{s}}=13}) TeV","authors":"ALICE Collaboration","doi":"10.1140/epja/s10050-025-01615-4","DOIUrl":"10.1140/epja/s10050-025-01615-4","url":null,"abstract":"<div><p>The interaction between pions and nucleons plays a crucial role in hadron physics. It represents a fundamental building block of the low-energy QCD dynamics and is subject to several resonance excitations. This work studies the <span>(text {p--}uppi ^{pm })</span> dynamics using femtoscopic correlations in high-multiplicity pp collisions at <span>(sqrt{s} = 13)</span> TeV measured by ALICE at the LHC. As the final-state interaction between protons and pions is well constrained by scattering experiments and the study of pionic hydrogen, the results give access to information on the particle-emitting source in pp collisions using the femtoscopy methods. The scaling of the source size of primordial protons and pions against their pair transverse mass is extracted. The results are compared with the source sizes studied with p–p, <span>(text {p--K}^+)</span>, and <span>(uppi ^pm )</span>–<span>(uppi ^pm )</span> pairs by ALICE in the same collision system and are found to be in agreement for the different particle pairs. This reinforces recent findings by ALICE of a common emission source for all hadron-pairs in pp collisions at LHC energies. Furthermore, the <span>(text {p--p--}uppi ^{pm })</span> systems are studied using three-particle femtoscopy in pp collisions at <span>(sqrt{s} = 13)</span> TeV. The presence of three-body effects is analyzed utilizing the cumulant expansion method. In this formalism, the known two-body interactions are subtracted in order to isolate the three-body effects. For both, <span>(text {p--p--}uppi ^{+})</span> and <span>(text {p--p--}uppi ^{-})</span>, a non-zero cumulant is found, indicating effects beyond pairwise interactions. These results give information on the coupling of the pion to multiple nucleons.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01615-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144869138","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}
S. Chen, S. Paschalis, M. Petri, M. A. Bentley, M. Labiche, S. Heil, F. Holloway
{"title":"Development of the self-calibration technique for (gamma )-ray energy tracking arrays","authors":"S. Chen, S. Paschalis, M. Petri, M. A. Bentley, M. Labiche, S. Heil, F. Holloway","doi":"10.1140/epja/s10050-025-01651-0","DOIUrl":"10.1140/epja/s10050-025-01651-0","url":null,"abstract":"<div><p>Determining the three-dimensional <span>(gamma )</span>-ray interaction position in <span>(gamma )</span>-ray tracking arrays is achieved by comparing in real time the measured electronic signals against a pre-generated library of calculated signals (signal basis) that maps the detector response throughout the crystal volume. Obtaining a high-fidelity signal basis remains a significant technological challenge that often limits the ultimate performance of the arrays. To address this, a self-calibration method was proposed to generate the signal basis experimentally, in an iterative way and in situ; its potential has been demonstrated in a proof-of-concept study using a simplistic geometry. In this article, we extend and refine this innovative technique for <span>(gamma )</span>-ray tracking arrays using realistic simulations of the actual crystal geometries and including pulse-shape analysis that mimics the reconstruction that takes place experimentally. Key factors determining the performance of the method, such as the conditions for position convergence, statistical requirements, the impact of convoluting electronic noise to the signals, and the time alignment are investigated systematically within this framework. The results show that the method is robust and holds promise for generating high-fidelity signal basis experimentally. The analysis framework established in this work sets the stage for applying the self-calibration technique to real experimental data.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880866","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}
Ranjith Mudimadugula, Federico Schianchi, Anna Neuweiler, Thibeau Wouters, Henrique Gieg, Tim Dietrich
{"title":"Employing deep-learning techniques for the conservative-to-primitive recovery in binary neutron star simulations","authors":"Ranjith Mudimadugula, Federico Schianchi, Anna Neuweiler, Thibeau Wouters, Henrique Gieg, Tim Dietrich","doi":"10.1140/epja/s10050-025-01661-y","DOIUrl":"10.1140/epja/s10050-025-01661-y","url":null,"abstract":"<div><p>The detection of GW170817, together with its electromagnetic counterparts, has proven that binary neutron star mergers are of central importance to the field of nuclear astrophysics, e.g., through a better understanding of the formation of elements and novel constraints on the supranuclear dense equation of state governing the matter inside neutron stars. Essential for understanding the binary coalescence are numerical-relativity simulations, which typically come with high computational costs requiring high-performance computing facilities. In this work, we build on recent studies to investigate whether novel techniques, such as neural networks, can be employed in the conversion of conservative variables to primitive hydrodynamical variables, such as pressure and density. In this regard, we perform – to the best of our knowledge – the first binary neutron star merger simulations in which such methods are employed. We show that this method results in stable simulations, reaching accuracies similar to traditional methods with an overall comparable computational cost. These simulations serve as a proof of principle that, in the future, deep learning techniques could be used within numerical-relativity simulations. However, further improvements are necessary to offer a computational advantage compared to traditional methods.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01661-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144869139","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":"Theoretical models for exotic nuclei (2nd edition)","authors":"Hiroyuki Sagawa, Kouichi Hagino","doi":"10.1140/epja/s10050-025-01641-2","DOIUrl":"10.1140/epja/s10050-025-01641-2","url":null,"abstract":"<div><p>This article is a new edition of the review paper which we published in 2015 (Sagawa and Hagino in Eur Phys J A 51:102, 2015). We particularly summarize many developments in physics of exotic nuclei after we published the previous review article. This includes recent theoretical developments in the density functional theory, the three-body model, ab-initio approaches, and machine learnings, as well as new experimental findings such as tetra neutrons, knock-out reactions of halo nuclei, 4-neutron decays of <span>(^{28})</span>O, the Coulomb breakup of <span>(^{19})</span>B, and <span>(beta )</span>-decays of nuclei relevant to r-process nucleosynthesis. We also cover halo and related topics in other disciplines, such as Efimov physics in cold atoms and halos in hypernuclei.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144929325","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}
A. Compagnucci, A. Formicola, M. Campostrini, J. Cruz, M. Aliotta, C. Ananna, L. Barbieri, F. Barile, D. Bemmerer, A. Best, A. Boeltzig, C. Broggini, C. G. Bruno, A. Caciolli, F. Casaburo, F. Cavanna, G. F. Ciani, P. Colombetti, P. Corvisiero, L. Csedreki, T. Davinson, R. Depalo, A. Di Leva, Z. Elekes, F. Ferraro, Zs. Fülöp, A. Guglielmetti, C. Gustavino, Gy. Gyürky, G. Imbriani, M. Junker, M. Lugaro, P. Marigo, J. Marsh, E. Masha, R. Menegazzo, V. Paticchio, D. Piatti, P. Prati, D. Rapagnani, V. Rigato, D. Robb, L. Schiavulli, R. S. Sidhu, J. Skowronski, O. Straniero, T. Szücs, S. Turkat, S. Zavatarelli
{"title":"Towards a comprehensive study of the (^{14})N(p,(gamma ))(^{15})O astrophysical key reaction: Description of the experimental technique including novel target preparation","authors":"A. Compagnucci, A. Formicola, M. Campostrini, J. Cruz, M. Aliotta, C. Ananna, L. Barbieri, F. Barile, D. Bemmerer, A. Best, A. Boeltzig, C. Broggini, C. G. Bruno, A. Caciolli, F. Casaburo, F. Cavanna, G. F. Ciani, P. Colombetti, P. Corvisiero, L. Csedreki, T. Davinson, R. Depalo, A. Di Leva, Z. Elekes, F. Ferraro, Zs. Fülöp, A. Guglielmetti, C. Gustavino, Gy. Gyürky, G. Imbriani, M. Junker, M. Lugaro, P. Marigo, J. Marsh, E. Masha, R. Menegazzo, V. Paticchio, D. Piatti, P. Prati, D. Rapagnani, V. Rigato, D. Robb, L. Schiavulli, R. S. Sidhu, J. Skowronski, O. Straniero, T. Szücs, S. Turkat, S. Zavatarelli","doi":"10.1140/epja/s10050-025-01658-7","DOIUrl":"10.1140/epja/s10050-025-01658-7","url":null,"abstract":"<div><p>While the <span>(^{14})</span>N(p,<span>(gamma )</span>)<span>(^{15})</span>O reaction plays a key role in the hydrogen-burning processes in various stellar conditions, its reaction rate is not known with sufficient precision. Therefore, the first scientific project at the recently launched Bellotti Ion Beam Facility of the Laboratori Nazionali del Gran Sasso was the measurement of the <span>(^{14})</span>N(p,<span>(gamma )</span>)<span>(^{15})</span>O reaction cross section in the proton energy range between 250 and 1500 keV. In this paper, the experimental techniques are summarized with special emphasis on the description of solid state nitrogen target production and characterization. The first results of the reaction yield measured at 55<span>(^circ )</span> detection angle are also presented.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01658-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144853646","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":"Precision measurement of the half-lifes of the excited nuclear states in Fe-57","authors":"Benedikt Bergmann, Lukas Javora, Petr Smolyanskiy","doi":"10.1140/epja/s10050-025-01659-6","DOIUrl":"10.1140/epja/s10050-025-01659-6","url":null,"abstract":"<div><p>The half-lifes of the nuclear isomeric states in <sup>57</sup>Fe at 14.4 keV and 136.5 keV above the ground state are measured with unprecedented precision using hybrid pixel detectors based on Timepix3 technology. These detectors enable dead-time-free single-photon detection and provide simultaneous measurements of photon energy and arrival time, allowing for nanosecond-scale determination of time differences between characteristic X-rays and <span>(gamma )</span>-rays emitted during the electron-capture decay of <sup>57</sup>Co. Employing the delayed coincidence technique, the half-life of the 14.4-keV state is determined as <span>(t^{14.4 text { keV}}_{1/2} = 97.82(5))</span> ns, achieving a fourfold improvement in precision over previous measurements. The half-life of the 136.5-keV state is measured as <span>(t^{136 text { keV}}_{1/2}= 8.730(17))</span> ns, reducing the uncertainty by a factor of two. These results are discussed in the context of previous works.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01659-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843339","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}
S. Kumar, R. Tripathi, S. Patra, A. Mhatre, A. Kumar, K. Ramachandran, T. N. Nag, S. Santra
{"title":"Fission product mass distribution studies in 35Cl + 176Yb and 35Cl + 165Ho reactions","authors":"S. Kumar, R. Tripathi, S. Patra, A. Mhatre, A. Kumar, K. Ramachandran, T. N. Nag, S. Santra","doi":"10.1140/epja/s10050-025-01655-w","DOIUrl":"10.1140/epja/s10050-025-01655-w","url":null,"abstract":"<div><p>Many studies on the fission fragment mass distribution in the sub-lead and pre-actinide region have proposed the presence of asymmetric components in this mass region, primarily due to proton shells corresponding to Z ≈ 36, 38. Present studies have been carried out to investigate the mass distributions in the <sup>35</sup>Cl + <sup>176</sup>Yb → <sup>211</sup>Fr and <sup>35</sup>Cl + <sup>165</sup>Ho → <sup>200</sup>Po reactions in the mass region around ~ 200, a transition between the sub-lead and actinide region. Mass distribution studies have been carried out near the entrance channel Coulomb barrier using the recoil catcher technique, followed by off-line γ-ray spectrometry of the fission products. The broad Gaussian nature of the mass distribution in the <sup>35</sup>Cl + <sup>176</sup>Yb reaction indicates a dominant symmetric fission contribution. The mass distributions for the <sup>35</sup>Cl + <sup>176</sup>Yb and <sup>35</sup>Cl + <sup>165</sup>Ho reactions were found to be in gross agreement with GEF (Schmidt et al<i>.</i> in Nucl Data Sheets 131:107, 2016; Schmidt and Jurado in Rep Prog Phys 81:106301, 2018). The GEF model predicts a dominant symmetric fission contribution along with the contribution from the asymmetric fission mode corresponding to <i>Z</i> ≈ 38. The most probable charge, Z<sub>P</sub> was varied within a range of ± 1.5 units with respect to that obtained using the unchanged charge density hypothesis to obtain the best agreement with GEF. However, a few experimental mass yields in the mass regions corresponding to Z ≈ 50–52 and <i>Z</i> ≈ 54–56 were observed to be still higher (more than ~ 50%) compared to the GEF predictions. A similar enhancement observed in the corresponding fission product yields indicates possible contributions from the conventional asymmetric fission modes, in addition to the shell corresponding to Z ≈ 38.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01655-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843338","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":"Revised QCD effects on the Z (rightarrow ,boverline{b}) forward–backward asymmetry in (e^+e^-) collisions","authors":"David d’Enterria, Cynthia Yan","doi":"10.1140/epja/s10050-025-01656-9","DOIUrl":"10.1140/epja/s10050-025-01656-9","url":null,"abstract":"<div><p>The forward–backward (FB) asymmetry of <i>b</i> quarks in <span>(e^+e^-)</span> collisions at the Z pole measured at LEP, <span>(A_{_{textsc {fb}}}^{0,b}= 0.0992pm 0.0016)</span>, remains today one of the electroweak precision observables with the largest disagreement (2.4<span>(sigma )</span>) with respect to the Standard Model prediction, <span>((A_{_{textsc {fb}}}^{0,b})_{_textrm{th}} = 0.1030 pm 0.0002)</span>. Beyond the dominant statistical uncertainties, QCD effects, such as <i>b</i>-quark showering and hadronization, are the leading sources of <span>(A_{_{textsc {fb}}}^{0,b})</span> systematic uncertainty, and have not been revised in the last twenty years. We reassess the QCD uncertainties of the eight original <span>(A_{_{textsc {fb}}}^{0,b})</span> LEP measurements, using modern parton shower <span>pythia</span> 8 and <span>vincia</span> simulations with nine different implementations of soft and collinear radiation as well as of parton fragmentation. Our analysis, combined with NNLO massive <i>b</i>-quark corrections independently computed, indicates total propagated QCD uncertainties of <span>(sim )</span>0.7% and <span>(sim )</span>0.3% for the lepton- and jet-charge analyses, respectively, that are about a factor of two smaller than those of the original LEP results. Accounting for such updated QCD effects leads to a new <span>(A_{_{textsc {fb}}}^{0,b}= 0.0995pm 0.0016)</span> average, with a data-theory tension slightly reduced from 2.4<span>(sigma )</span> to 2.2<span>(sigma )</span>. Confirmation or resolution of this long-term discrepancy requires a new high-luminosity <span>(e^+e^-)</span> collider collecting orders-of-magnitude more data at the Z pole to significantly reduce the dominant <span>(A_{_{textsc {fb}}}^{0,b})</span> statistical uncertainties, and to improve our understanding of <i>b</i>-quark showering and hadronization.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01656-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832058","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}
M. Scheck, R. Schwengner, O. Agar, R. Beyer, R. Chapman, K. Gladnishki, R.-D. Herzberg, H. Hoffmann, A. R. Junghans, D. Kocheva, S. E. Müller, D. O’Donnell, G. Rainovski, K. Römer, D. Savran, K. Schmidt, P. G. Thirolf, A. Wagner, O. Wieland, A. Yadav, F. Zhu
{"title":"Photo-response of the (N=Z) nucleus 28Si below 13.0 MeV","authors":"M. Scheck, R. Schwengner, O. Agar, R. Beyer, R. Chapman, K. Gladnishki, R.-D. Herzberg, H. Hoffmann, A. R. Junghans, D. Kocheva, S. E. Müller, D. O’Donnell, G. Rainovski, K. Römer, D. Savran, K. Schmidt, P. G. Thirolf, A. Wagner, O. Wieland, A. Yadav, F. Zhu","doi":"10.1140/epja/s10050-025-01647-w","DOIUrl":"10.1140/epja/s10050-025-01647-w","url":null,"abstract":"<div><p>The electric <i>E</i>1 and magnetic <i>M</i>1 dipole responses of the <span>(N=Z)</span> nucleus <sup>28</sup>Si were investigated in a nuclear resonance fluorescence experiment at the ELBE accelerator of the Helmholtz Zentrum Dresden-Rossendorf. The investigated energy range extends to 13.0 MeV, which corresponds to the kinetic energy of the electrons that were used to produce the unpolarised bremsstrahlung in the entrance channel of the <sup>28</sup>Si(<span>(gamma ,gamma ^{prime })</span>) reaction. The bremsstrahlung photons excited three <span>(J^{pi }=1^-)</span>, seven <span>(J^{pi }=1^+)</span>, and several <span>(J^{pi }=2^+)</span> states. De-excitation <span>(gamma )</span> rays were detected using the four high-purity germanium detectors of the <span>(gamma )</span>ELBE setup. The excellent background conditions allowed to identify nine previously unobserved <span>(gamma )</span>-ray transitions. In the investigated energy region of up to 13.0 MeV a total <span>(sum _i B(M1, 0^+ rightarrow 1^+_i)= 5.0(3)~mu _N^2)</span> strength is firmly observed with a possible addition of <span>(B(M1, 0^+ rightarrow 1^+_i) le 0.14~mu _N^2)</span> from levels for which the data allows to establish only an upper limit. Furthermore, below 13 MeV this <span>(N=Z)</span> nucleus exhibits a marginal isoscalar <i>E</i>1 strength of <span>(sum _i B(E1, 0^+ rightarrow 1^-)= 2.6(3) times 10^{-3})</span> <span>(hbox {e}^2 hbox {fm}^2)</span>, which exhausts only 0.026(2) % of the energy-weighted sum rule.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01647-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832011","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}
M. Albaladejo, A. Feijoo, I. Vidaña, J. Nieves, E. Oset
{"title":"Inverse problem in femtoscopic correlation functions: the (T_{cc}(3875)^+) state","authors":"M. Albaladejo, A. Feijoo, I. Vidaña, J. Nieves, E. Oset","doi":"10.1140/epja/s10050-025-01650-1","DOIUrl":"10.1140/epja/s10050-025-01650-1","url":null,"abstract":"<div><p>We study the inverse problem of analyzing femtoscopic correlation functions with an efficient tool to extract the maximum information possible about the interaction between the involved coupled-channel hadrons, and derive the existence of possible bound states. The method is flexible enough to accommodate non-molecular components and the effect of missing channels relevant for the interaction. We apply the method to realistic correlation functions for the <span>(D^{*+}D^0)</span> and <span>(D^{*0}D^+)</span> pairs derived consistently from the properties of the <span>(T_{cc}(3875)^+)</span>. We can extract the existence of a bound state, its <span>(D^{*+}D^0)</span>-<span>(D^{*0}D^+)</span> molecular nature, the probabilities of each channel, as well as scattering lengths and effective ranges, together with the size of the source function, all of these quantities with relatively good precision. We analyze (pseudo) data generated with source sizes of <span>(1,text {fm})</span> and <span>(5,text {fm})</span>, and observe that the uncertainties are larger for the second case.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01650-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832068","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}