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class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Conceptual design of the Spin Physics Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&amp;query=Abazov%2C+V+M">V. M. Abazov</a>, <a href="/search/physics?searchtype=author&amp;query=Abramov%2C+V">V. Abramov</a>, <a href="/search/physics?searchtype=author&amp;query=Afanasyev%2C+L+G">L. G. Afanasyev</a>, <a href="/search/physics?searchtype=author&amp;query=Akhunzyanov%2C+R+R">R. R. Akhunzyanov</a>, <a href="/search/physics?searchtype=author&amp;query=Akindinov%2C+A+V">A. V. Akindinov</a>, <a href="/search/physics?searchtype=author&amp;query=Akopov%2C+N">N. Akopov</a>, <a href="/search/physics?searchtype=author&amp;query=Alekseev%2C+I+G">I. G. Alekseev</a>, <a href="/search/physics?searchtype=author&amp;query=Aleshko%2C+A+M">A. M. Aleshko</a>, <a href="/search/physics?searchtype=author&amp;query=Alexakhin%2C+V+Y">V. Yu. Alexakhin</a>, <a href="/search/physics?searchtype=author&amp;query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/physics?searchtype=author&amp;query=Alexeev%2C+M">M. Alexeev</a>, <a href="/search/physics?searchtype=author&amp;query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/physics?searchtype=author&amp;query=Anikin%2C+I+V">I. V. Anikin</a>, <a href="/search/physics?searchtype=author&amp;query=Andreev%2C+V+F">V. F. Andreev</a>, <a href="/search/physics?searchtype=author&amp;query=Anosov%2C+V+A">V. A. Anosov</a>, <a href="/search/physics?searchtype=author&amp;query=Arbuzov%2C+A+B">A. B. Arbuzov</a>, <a href="/search/physics?searchtype=author&amp;query=Azorskiy%2C+N+I">N. I. Azorskiy</a>, <a href="/search/physics?searchtype=author&amp;query=Baldin%2C+A+A">A. A. Baldin</a>, <a href="/search/physics?searchtype=author&amp;query=Balandina%2C+V+V">V. V. Balandina</a>, <a href="/search/physics?searchtype=author&amp;query=Baldina%2C+E+G">E. G. Baldina</a>, <a href="/search/physics?searchtype=author&amp;query=Barabanov%2C+M+Y">M. Yu. Barabanov</a>, <a href="/search/physics?searchtype=author&amp;query=Barsov%2C+S+G">S. G. Barsov</a>, <a href="/search/physics?searchtype=author&amp;query=Baskov%2C+V+A">V. A. Baskov</a>, <a href="/search/physics?searchtype=author&amp;query=Beloborodov%2C+A+N">A. N. Beloborodov</a>, <a href="/search/physics?searchtype=author&amp;query=Belov%2C+I+N">I. N. Belov</a> , et al. (270 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2102.00442v3-abstract-short" style="display: inline;"> The Spin Physics Detector, a universal facility for studying the nucleon spin structure and other spin-related phenomena with polarized proton and deuteron beams, is proposed to be placed in one of the two interaction points of the NICA collider that is under construction at the Joint Institute for Nuclear Research (Dubna, Russia). At the heart of the project there is huge experience with polarize&hellip; <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.00442v3-abstract-full').style.display = 'inline'; document.getElementById('2102.00442v3-abstract-short').style.display = 'none';">&#9661; More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.00442v3-abstract-full" style="display: none;"> The Spin Physics Detector, a universal facility for studying the nucleon spin structure and other spin-related phenomena with polarized proton and deuteron beams, is proposed to be placed in one of the two interaction points of the NICA collider that is under construction at the Joint Institute for Nuclear Research (Dubna, Russia). At the heart of the project there is huge experience with polarized beams at JINR. The main objective of the proposed experiment is the comprehensive study of the unpolarized and polarized gluon content of the nucleon. Spin measurements at the Spin Physics Detector at the NICA collider have bright perspectives to make a unique contribution and challenge our understanding of the spin structure of the nucleon. In this document the Conceptual Design of the Spin Physics Detector is presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.00442v3-abstract-full').style.display = 'none'; document.getElementById('2102.00442v3-abstract-short').style.display = 'inline';">&#9651; Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0306161">arXiv:physics/0306161</a> <span>&nbsp;[<a href="https://arxiv.org/pdf/physics/0306161">pdf</a>, <a href="https://arxiv.org/ps/physics/0306161">ps</a>, <a href="https://arxiv.org/format/physics/0306161">other</a>]&nbsp;</span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0953-4075/36/21/007">10.1088/0953-4075/36/21/007 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Monte Carlo Calculation of the Pionium Break-up Probability with Different Sets of Pionium Target Cross Sections </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&amp;query=Santamarina%2C+C">C. Santamarina</a>, <a href="/search/physics?searchtype=author&amp;query=Schumann%2C+M">M. Schumann</a>, <a href="/search/physics?searchtype=author&amp;query=Afanasyev%2C+L+G">L. G. Afanasyev</a>, <a href="/search/physics?searchtype=author&amp;query=Heim%2C+T">T. Heim</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="physics/0306161v1-abstract-short" style="display: inline;"> Chiral Perturbation Theory predicts the lifetime of pionium, a hydrogen-like $蟺^+ 蟺^-$ atom, to better than 3% precision. The goal of the DIRAC experiment at CERN is to obtain and check this value experimentally by measuring the break-up probability of pionium in a target. In order to accurately measure the lifetime one needs to know the relationship between the break-up probability and lifetime&hellip; <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0306161v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0306161v1-abstract-short').style.display = 'none';">&#9661; More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0306161v1-abstract-full" style="display: none;"> Chiral Perturbation Theory predicts the lifetime of pionium, a hydrogen-like $蟺^+ 蟺^-$ atom, to better than 3% precision. The goal of the DIRAC experiment at CERN is to obtain and check this value experimentally by measuring the break-up probability of pionium in a target. In order to accurately measure the lifetime one needs to know the relationship between the break-up probability and lifetime to a 1% accuracy. We have obtained this dependence by modeling the evolution of pionic atoms in the target using Monte Carlo methods. The model relies on the computation of the pionium--target atom interaction cross sections. Three different sets of pionium--target cross sections with varying degrees of complexity were used: from the simplest first order Born approximation involving only the electrostatic interaction to a more advanced approach taking into account multi-photon exchanges and relativistic effects. We conclude that in order to obtain the pionium lifetime to 1% accuracy from the break-up probability, the pionium--target cross sections must be known with the same accuracy for the low excited bound states of the pionic atom. This result has been achieved, for low $Z$ targets, with the two most precise cross section sets. For large $Z$ targets only the set accounting for multiphoton exchange satisfies the condition. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0306161v1-abstract-full').style.display = 'none'; document.getElementById('physics/0306161v1-abstract-short').style.display = 'inline';">&#9651; Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 June, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2003. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Journal of Physics B: Atomic, Molecular and Optical Physics; (submited; 17 pages, 6 figures, 18 references)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J.Phys.B.At.Mol.Opt.Phys. 36 (2003) 4273-4287 </p> </li> 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