79 research outputs found

    Study of the doubly charmed tetraquark T+cc

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    Quantum chromodynamics, the theory of the strong force, describes interactions of coloured quarks and gluons and the formation of hadronic matter. Conventional hadronic matter consists of baryons and mesons made of three quarks and quark-antiquark pairs, respectively. Particles with an alternative quark content are known as exotic states. Here a study is reported of an exotic narrow state in the D0D0π+ mass spectrum just below the D*+D0 mass threshold produced in proton-proton collisions collected with the LHCb detector at the Large Hadron Collider. The state is consistent with the ground isoscalar T+cc tetraquark with a quark content of ccu⎯⎯⎯d⎯⎯⎯ and spin-parity quantum numbers JP = 1+. Study of the DD mass spectra disfavours interpretation of the resonance as the isovector state. The decay structure via intermediate off-shell D*+ mesons is consistent with the observed D0π+ mass distribution. To analyse the mass of the resonance and its coupling to the D*D system, a dedicated model is developed under the assumption of an isoscalar axial-vector T+cc state decaying to the D*D channel. Using this model, resonance parameters including the pole position, scattering length, effective range and compositeness are determined to reveal important information about the nature of the T+cc state. In addition, an unexpected dependence of the production rate on track multiplicity is observed

    ATTEST - T5.1 and T5.2 - Tool for the characterization of the condition of assets and Tool for the definition of condition indicators based on heterogeneous information sources

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    <p>The Asset Management Tool is a comprehensive solution for asset analysis and management, offering an intuitive interface to configure and generate results from your asset data. It allows you to create customized dashboards to visualize and analyze assets based on various dimensions and variables. This program is free software: you can redistribute it and/or modify it under the terms of the European Union Public Licence v1.2 as published by the European Union.</p&gt

    Viral and bacterial levels resulting from the land application of digested sludge /

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    March 1979.Contract no. 68-02-2233.Includes bibliographical references.Mode of access: Internet

    Studies of reactor containment. task two final report, IITRI Project T6042 /

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    "IITRI-578P21-9 ; UC-80 ; TID-4500 39th Ed."Includes bibliographical references (p. 279-283).U.S. Atomic Energy Commission Contract ;Mode of access: Internet.This bibliographic record is available under the Creative Commons CC0 public domain dedication. The University of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law

    Studies of reactor containment : summary report /

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    Includes bibliographical references (page 56).U.S. Atomic Energy Commission Contract ;Mode of access: Internet
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