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Pionium
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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Mesonic_molecule/GMaF76bl">Mesonic molecule</a></li> <li><a href="/facts/Onium/85uteEFR">Onium</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Adeva, B.; et al. (2011). "Determination of ππ scattering lengths from measurement of π+π−π+π− atom lifetime". Physics Letters B. 704 (1–2): 24–29. arXiv:1109.0569. Bibcode:2011PhLB..704...24A. doi:10.1016/j.physletb.2011.08.074. S2CID 18091499. <a href="/wiki/Physics_Letters_B" target="_blank">/wiki/Physics_Letters_B</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Batley, J. R.; et al. (2006). "Observation of a cusp-like structure in the π0π0 invariant mass distribution from K± → π±π0π0 decay and determination of the ππ scattering lengths". Physics Letters B. 633 (2–3): 173–182. arXiv:hep-ex/0511056. Bibcode:2006PhLB..633..173N. doi:10.1016/j.physletb.2005.11.087. S2CID 14747304. <a href="/wiki/Physics_Letters_B" target="_blank">/wiki/Physics_Letters_B</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Batley, J. R.; et al. (2009). "Determination of the S-wave ππ scattering lengths from a study of K±→π±π0π0 decays". European Physical Journal C. 64 (4): 589–608. arXiv:0912.2165. Bibcode:2009EPJC...64..589B. doi:10.1140/epjc/s10052-009-1171-3. S2CID 14006827. <a href="/wiki/European_Physical_Journal_C" target="_blank">/wiki/European_Physical_Journal_C</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Santamarina, C.; Schumann, M.; Afanasyev, L. G.; Heim, T. (2003). "A Monte Carlo calculation of the pionium break-up probability with different sets of pionium target cross sections". Journal of Physics B. 36 (21): 4273–4287. arXiv:physics/0306161. Bibcode:2003JPhB...36.4273S. CiteSeerX 10.1.1.286.4685. doi:10.1088/0953-4075/36/21/007. S2CID 250810773. <a href="/wiki/Journal_of_Physics_B" target="_blank">/wiki/Journal_of_Physics_B</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> </ol>