{"id":48221,"date":"2020-12-14T17:47:39","date_gmt":"2020-12-14T16:47:39","guid":{"rendered":"https:\/\/aktuelles.uni-frankfurt.de\/?p=48221"},"modified":"2023-02-21T15:57:33","modified_gmt":"2023-02-21T14:57:33","slug":"physics-new-method-for-precision-studies-of-the-strong-interaction","status":"publish","type":"post","link":"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/physics-new-method-for-precision-studies-of-the-strong-interaction\/","title":{"rendered":"Physics: New method for precision studies of the strong interaction"},"content":{"rendered":"
\"\"
In the future, hyperons will be measured at the ALICE detector of the CERN particle accelerator centre. Scientists from Goethe University are part of the ALICE collaboration. Credit: CERN<\/em><\/figcaption><\/figure><\/div>\n\n\n\n

Extremely dense neutron\nstars may contain unstable hyperons in their interior, which, like the stable\nhadrons of the atomic nucleus, protons and neutrons, are held together by the strong\ninteraction. Scientists from the ALICE collaboration at the accelerator centre\nCERN have now developed a method to precisely measure the strong interaction\nbetween unstable hadrons in experiments for the first time. Research teams from\nGoethe University headed by Professor Harald Appelsh\u00e4user and TU Munich headed\nby Professor Laura Fabbietti were involved in the development.<\/strong><\/p>\n\n\n\n

In an article published\ntoday in Nature, the ALICE collaboration describes a novel method that will\nallow precision measurements of the strong interaction between hadrons at the\nLarge Hadron Collider (LHC) accelerator at CERN in Geneva.<\/p>\n\n\n\n

Hadrons – which include\nprotons and neutrons – are particles composed of two or three quarks, which are\nheld together by the strong interaction. However, the interaction is not\nlimited to the interior of the hadron, but extends beyond it. It leads to something\nknown as residual interaction, due to which hadrons also exert forces on each\nother. The best-known example is the force between protons and neutrons, which\nis responsible for the cohesion of atomic nuclei. One of the great challenges\nof modern nuclear physics is to achieve an accurate calculation of the strong\nforce between hadrons, which is based on the underlying strong interaction of\nquarks.<\/p>\n\n\n\n

Within the framework of something\nknown as „lattice QCD“ calculations, the effective strong force\nbetween hadrons can be calculated on the basis of the fundamental theory of the\nstrong interaction between quarks. However, these calculations are only very\naccurate for hadrons containing heavy quarks. This applies, for example, to\nhyperons, i.e. hadrons that contain one or more strange quarks. Although the\nstrong interaction caused by collisions of hadrons can be studied in scattering\nexperiments, it is difficult to perform these experiments with unstable hadrons\nsuch as hyperons. Accordingly, an experimental comparison with the precise\ntheoretical predictions from the lattice QCD for hyperons is difficult.<\/p>\n\n\n\n

In today’s publication\nof the ALICE collaboration a method is presented which allows the study of the\ndynamics of the strong interaction for arbitrary pairs of hadrons. This\nconcerns especially those hadrons which are short-lived, i.e. which decay after\nfractions of seconds and therefore cannot be investigated in scattering\nexperiments. Instead, the hadrons are generated in proton-proton collisions at\nthe LHC. The interaction between them can be measured on the basis of their\nrelative momentum distribution.<\/p>\n\n\n\n

Professor Laura\nFabbietti from the TU Munich, who has contributed significantly to the results\npresented here, emphasises that this breakthrough is due to both the LHC and\nthe ALICE detector. The LHC is able to generate a very large number of hadrons\nwith strange quarks and thus provides an insight into the nature of the strong\ninteraction. The ALICE detector and its high-resolution Time Projection Chamber\n(TPC), in turn, would provide the necessary precision to identify the particles\naccurately and measure their momentum accurately.<\/p>\n\n\n\n

Harald Appelsh\u00e4user,\nprofessor at Goethe University, has been leading the ALICE TPC project for ten\nyears and is co-author of the publication. He works closely with Laura\nFabbietti’s Munich group and emphasises that the method presented would usher\nin „a new era of precision studies of the strong interaction between exotic\nhadrons at the LHC.“<\/p>\n\n\n\n

The method presented is\ncalled femtoscopy because the processes examined take place in a spatial area\nof about 1 femtometre (10-15<\/sup>metres). This corresponds approximately to the size of a\nhadron and the range of the strong interaction. Using this method, the ALICE\ncollaboration has already been able to study interactions between hyperons\ncontaining one or two strange quarks. In the publication, a measurement of the\ninteraction between a proton and the omega (\u03a9) hyperon has now been\ninvestigated for the first time and with high precision. The omega is the\nrarest of all hyperons and consists of three strange quarks.<\/p>\n\n\n\n

Professor Appelsh\u00e4user\nemphasises that the significance of the results goes beyond the verification of\ntheoretical calculations: „Femtoscopic investigations can significantly\nexpand our understanding of very dense stellar objects such as neutron stars,\nwhich can contain hyperons in their interior and whose interaction is still\nlargely unknown.“<\/p>\n\n\n\n

Publication:\u00a0<\/strong>Shreyasi Acharya et al. (ALICE Collaboration):\u00a0Unveiling the strong interaction among hadrons at the LHC.<\/strong>\u00a0Nature, 9 December 2020, \u00a0https:\/\/doi.org\/10.1038\/s41586-020-3001-6<\/a>

Explanatory video <\/strong>by TU Munich on this subject:
R\u00e4tselhafte Neutronensterne \u2013 Pr\u00e4zise Messung der starken Wechselwirkung – YouTube<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Extremely dense neutron stars may contain unstable hyperons in their interior, which, like the stable hadrons of the atomic nucleus, protons and neutrons, are held together by the strong interaction. 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