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<div class="pre" style="margin: 0; padding: 0; font-family: monospace">********************************************<br /> Secretaría Dpto. de Física<br /> <a href="mailto:secre2@fisica.unlp.edu.ar">secre2@fisica.unlp.edu.ar</a><br /> Cecilia Cafiero / Alejandro Chiquino<br /> 115 e/48 y 49 - Detrás del Colegio Nacional<br /> Facultad de Ciencias Exactas - UNLP<br /> ********************************************</div>
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<th align="right" valign="baseline" nowrap="nowrap">Asunto:</th>
<td>IFT seminar: "The new exotics Zcs(3085), Zcs(4003), Y(4230) decays and Flavour SU(3)", by Luciano Maiani</td>
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<th align="right" valign="baseline" nowrap="nowrap">Fecha:</th>
<td>2021-04-23 13:31</td>
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<th align="right" valign="baseline" nowrap="nowrap">Remitente:</th>
<td>Ernesto Arganda <ernesto.arganda@fisica.unlp.edu.ar></td>
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<th align="right" valign="baseline" nowrap="nowrap">Destinatario:</th>
<td>Secretaria de Física <secre2@fisica.unlp.edu.ar></td>
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<div dir="auto"><br />Para reenviar a [Todos], ¡gracias!</div>
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<div dir="auto">Monday, April 26th, 16:00h</div>
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<div dir="auto">The new exotics Zcs(3085), Zcs(4003), Y(4230) decays and Flavour SU(3)</div>
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<div dir="auto">Speaker: </div>
<div dir="auto" style="text-align: justify;"><span style="font-size: 12pt;">Luciano Maiani</span></div>
<div dir="auto" style="text-align: justify;"><span style="font-size: 12pt;">Institution: </span></div>
<div dir="auto" style="text-align: justify;"><span style="font-size: 12pt;">Università di Roma La Sapienza. Roma. Italy</span></div>
<div dir="auto" style="text-align: justify;"><span style="font-size: 12pt;">Location&Place: </span></div>
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<div dir="auto" style="text-align: justify;"><span style="font-size: 12pt;">IFT Seminar Room/Red Room</span></div>
<div dir="auto" style="text-align: justify;"><span style="font-size: 12pt;">Abstract: </span></div>
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<div dir="auto" style="text-align: justify;"><span style="font-size: 12pt;">New data from BES III and LHCb indicate the existence of two hidden charm, open strangeness resonances, Zcs(3985) and Zcs(4003). The near degeneracy of Zcs(3985) and Zcs(4003) reproduces, in the strange sector, the situation observed with X(3872) and Zc(3900). We show that, in the tetraquark picture, the Zcs resonances, together with X(3872), X(4140) and Zc(3900), neatly fit into two nonets of flavour SU(3), with JP = 1+ and opposite charge-conjugation. The mass of the missing element of the nonets is predicted. </span></div>
<div dir="auto" style="text-align: justify;"><span style="font-size: 12pt;">In the same framework, we have made a study of the decays of Y(4230) observed by BES III in e+e- annihilation. Results are compared with the well studied decays D∗ → D π decays, obtaining consistent results for the quark-pion coupling. We extend the discussion to the decay B -> K phi J/Psi where the signal of Zcs(4003) has been observed by LHCb.</span></div>
<div dir="auto" style="text-align: justify;"><span style="font-size: 12pt;"> These results represent a significative score in favour of the tetraquark model. We discuss briefly further steps necessary to clarify the nature of the exotic states under study.</span></div>
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<div dir="auto" style="text-align: justify;"><span style="font-size: 12pt;">https://www.ift.uam-csic.es/es/events/new-exotics-zcs3085-zcs4003-y4230-decays-and-flavour-su3</span></div>
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<div>Ernesto Arganda</div>
<div>High Energy Physics Group</div>
<div>Instituto de Física La Plata (IFLP-CONICET/UNLP)</div>
<div>Boulevard 113 y Calle 63 - 1900 La Plata</div>
<div>Buenos Aires - Argentina</div>
<div>Phone: (+54) 221 4215677</div>
<div>Fax: (+54) 221 4236335</div>
<div>E-mail: ernesto.arganda@fisica.unlp.edu.ar</div>
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