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Dear all, </div>

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<span style="font-size: 11pt;"><br>

</span><span style="font-size: 14.67px;">Tomorrow at 1:00PM EST, </span><span style="font-size: 11pt;">we will have a hybrid seminar given by Roberto Bruschini of Ohio State University,

<b>in person in CC L102</b> and on the following Zoom link: </span></div>

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<span style="background-color: rgb(255, 255, 255);"><a href="https://jlab-org.zoomgov.com/j/1607426246?pwd=b5ptBbcdCwMTKrUuyuu3ea0L8nRF6S.1" id="OWA1edf01c1-6c62-bf26-d3dc-98e568fffe3f" class="x_x_OWAAutoLink" title="https://jlab-org.zoomgov.com/j/1607426246?pwd=b5ptBbcdCwMTKrUuyuu3ea0L8nRF6S.1" data-auth="NotApplicable" data-linkindex="0" data-olk-copy-source="MessageBody" style="margin: 0px; background-color: rgb(255, 255, 255); text-align: left;">https://jlab-org.zoomgov.com/j/1607426246?pwd=b5ptBbcdCwMTKrUuyuu3ea0L8nRF6S.1</a></span></div>

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Please see below for the title and abstract. </div>

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<span style="background-color: white;">And if you want to meet with the speaker, please sign up for one or more slots at this link:</span></div>

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<span style="background-color: white;"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.google.com_spreadsheets_d_15PN6Z2TrmMnbDbd1LYN35wzFDoWpefpUQMDct-5FQkNz4_edit-3Fgid-3D0-23gid-3D0&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=FUKEpzQ_iKGpXpQ0Xqc8whL6HtjvOvoLnYEkFKeQ7R4&m=L4G4b-YP3OE_hzPhpNYbqtFN1qBIJoooC7nYbOVKBpDSuC5EIi3zbFbunw3DLYOQ&s=o317zW1ClwyINbzMb6F03Qhv9WAsu4H2WciUkAh1IKw&e=" id="OWAc9821ae6-fbde-9064-d1d9-60af615b5416" class="x_x_OWAAutoLink" title="https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.google.com_spreadsheets_d_15PN6Z2TrmMnbDbd1LYN35wzFDoWpefpUQMDct-5FQkNz4_edit-3Fgid-3D0-23gid-3D0&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=FUKEpzQ_iKGpXpQ0Xqc8whL6HtjvOvoLnYEkFKeQ7R4&m=L4G4b-YP3OE_hzPhpNYbqtFN1qBIJoooC7nYbOVKBpDSuC5EIi3zbFbunw3DLYOQ&s=o317zW1ClwyINbzMb6F03Qhv9WAsu4H2WciUkAh1IKw&e=" data-auth="NotApplicable" data-olk-copy-source="MessageBody" data-linkindex="1" style="margin: 0px; text-align: left;">https://docs.google.com/spreadsheets/d/15PN6Z2TrmMnbDbd1LYN35wzFDoWpefpUQMDct_QkNz4/edit?gid=0#gid=0</a></span></div>

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<div style="margin: 0px 12px 0px 0px;"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.google.com_spreadsheets_d_15PN6Z2TrmMnbDbd1LYN35wzFDoWpefpUQMDct-5FQkNz4_edit-3Fgid-3D0-23gid-3D0&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=FUKEpzQ_iKGpXpQ0Xqc8whL6HtjvOvoLnYEkFKeQ7R4&m=L4G4b-YP3OE_hzPhpNYbqtFN1qBIJoooC7nYbOVKBpDSuC5EIi3zbFbunw3DLYOQ&s=o317zW1ClwyINbzMb6F03Qhv9WAsu4H2WciUkAh1IKw&e=" id="LPImageAnchor507515" title="https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.google.com_spreadsheets_d_15PN6Z2TrmMnbDbd1LYN35wzFDoWpefpUQMDct-5FQkNz4_edit-3Fgid-3D0-23gid-3D0&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=FUKEpzQ_iKGpXpQ0Xqc8whL6HtjvOvoLnYEkFKeQ7R4&m=L4G4b-YP3OE_hzPhpNYbqtFN1qBIJoooC7nYbOVKBpDSuC5EIi3zbFbunw3DLYOQ&s=o317zW1ClwyINbzMb6F03Qhv9WAsu4H2WciUkAh1IKw&e=" data-linkindex="2" data-auth="NotApplicable" style="margin: 0px;"><img id="LPThumbnailImageId507515" width="240" height="126" style="width: 240px; height: 126px; margin: 0px; display: block;" src="https://lh7-us.googleusercontent.com/docs/AHkbwyKE71O03tAo8vW1q9zJ9nGuw5MTpLyyZIhWXSKCy7yLebug0aPbwUOJMe61QvxU5KAQf_2BfWBGSpr53E0Ocv7uMUwwvj0IT4ypzBpGchlMLub3Rg6O=w1200-h630-p"></a></div>

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<span style="font-weight: 300;"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.google.com_spreadsheets_d_15PN6Z2TrmMnbDbd1LYN35wzFDoWpefpUQMDct-5FQkNz4_edit-3Fgid-3D0-23gid-3D0&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=FUKEpzQ_iKGpXpQ0Xqc8whL6HtjvOvoLnYEkFKeQ7R4&m=L4G4b-YP3OE_hzPhpNYbqtFN1qBIJoooC7nYbOVKBpDSuC5EIi3zbFbunw3DLYOQ&s=o317zW1ClwyINbzMb6F03Qhv9WAsu4H2WciUkAh1IKw&e=" id="LPUrlAnchor507515" title="https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.google.com_spreadsheets_d_15PN6Z2TrmMnbDbd1LYN35wzFDoWpefpUQMDct-5FQkNz4_edit-3Fgid-3D0-23gid-3D0&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=FUKEpzQ_iKGpXpQ0Xqc8whL6HtjvOvoLnYEkFKeQ7R4&m=L4G4b-YP3OE_hzPhpNYbqtFN1qBIJoooC7nYbOVKBpDSuC5EIi3zbFbunw3DLYOQ&s=o317zW1ClwyINbzMb6F03Qhv9WAsu4H2WciUkAh1IKw&e=" data-linkindex="3" data-auth="NotApplicable" style="text-decoration: none; margin: 0px;">Roberto

 Bruschini (Ohio State U.) schedule Feb 17th, 2025</a></span></div>

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urldefense.proofpoint.com</div>

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<b><u>Theory Seminar</u></b>:<b> </b>February 17<sup>th</sup>, 1pm EST (hybrid) </div>

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<b><u>Speaker</u></b>: Roberto Bruschini (Ohio State University) </div>

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<span style="color: black;"><b><u>Title</u></b>:<b> </b></span><span style="color: rgb(0, 0, 0); background-color: white;">Explaining Exotic Heavy Hadrons from QCD</span><span style="color: black;"> </span></div>

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<span style="color: black;"><b><u>Abstract</u></b>: </span><span style="color: rgb(0, 0, 0); background-color: white; line-height: 1.284;">Exotic hadrons are enigmatic particles that cannot be explained as mesons made of a quark-antiquark pair or baryons made

 of three quarks. Most of those that have been observed are hidden-heavy hadrons containing a heavy quark-antiquark pair. They are typically found near the threshold for the production of two heavy hadrons. The nature of the exotic hadrons has remained unexplained

 for the last 20 years, an embarrassment for the theoretical high energy physics community. In this seminar, I illustrate a relatively simple solution to the exotic hadron puzzle that is firmly based on QCD using the Born-Oppenheimer approximation. In this

 approximation, exotic hidden-heavy hadrons are bound states and resonances in potentials that are repulsive at short range, cross a hadron-pair threshold, and approach the threshold from below. This explains the proximity of the exotic hadrons to hadron-pair

 thresholds and identifies the fine tunings of QCD that are responsible for the remarkable properties of some exotic hadrons. I will also discuss implications for the gluino-hadron spectrum in models with a long-lived gluino.</span><span style="color: black;"> </span></div>

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See you all tomorrow!</div>

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Best regards, </div>

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Joe, Zheng-Yang, and Gloria</div>

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