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SUMMARY:Vector-like quarks of Nelson-Barr type: an overview
DTSTART:20230615T110000Z
DTEND:20230615T130000Z
DTSTAMP:20260807T081546Z
UID:17be8d5c-11f2-4609-9176-c16d1d6616e3
SEQUENCE:1
CREATED:20230606T141800Z
DESCRIPTION: Abstract:The Nelson-Barr mechanism to solve the strong CP pro
 blem requires vector-like quarks (VLQs) to transmit the spontaneous CP bre
 aking to the SM. Even in the scenario where the spontaneous CP breaking se
 ctor is inaccessible\, these VLQs can be at the TeV scale in reach at pres
 ent colliders. In this talk I will show how these VLQs of Nelson-Barr type
  differ from generic VLQs and find from parameter counting that one less p
 arameter is needed. In particular\, for one VLQ of Nelson-Barr type\, ther
 e is only one CP odd quantity that is responsible for all CP violation in 
 the quark sector. In this case\, I will show that the model is largely fla
 vor safe. A global fit on the relevant flavor observables is also performe
 d\, and a comparison is made to the case of one generic VLQ. We find that 
 the allowed parameter space for the VLQ Yukawa couplings and the mixing to
  the SM are confined to a region much smaller than in the generic case\, m
 aking the NB case falsifiable in principle. I conclude presenting some rec
 ent analyses for the case in which two VLQs (either of down or up-type) ar
 e considered at the same time.
LAST-MODIFIED:20230606T141800Z
LOCATION:Sala de Seminários do DF\,  Pavilhão de Física\, 2º piso
URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/vector-like-quarks-of-nels
 on-barr-type-an-overview/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="j09k2"> </p><p data-block-
 key="7b8ci">Abstract:</p><p data-block-key="2avi9">The Nelson-Barr mechani
 sm to solve the strong CP problem requires vector-like quarks (VLQs) to tr
 ansmit the spontaneous CP breaking to the SM. Even in the scenario where t
 he spontaneous CP breaking sector is inaccessible\, these VLQs can be at t
 he TeV scale in reach at present colliders.<br/><br/> In this talk I will 
 show how these VLQs of Nelson-Barr type differ from generic VLQs and find 
 from parameter counting that one less parameter is needed. In particular\,
  for one VLQ of Nelson-Barr type\, there is only one CP odd quantity that 
 is responsible for all CP violation in the quark sector. In this case\, I 
 will show that the model is largely flavor safe. <br/><br/>A global fit on
  the relevant flavor observables is also performed\, and a comparison is m
 ade to the case of one generic VLQ. We find that the allowed parameter spa
 ce for the VLQ Yukawa couplings and the mixing to the SM are confined to a
  region much smaller than in the generic case\, making the NB case falsifi
 able in principle. I conclude presenting some recent analyses for the case
  in which two VLQs (either of down or up-type) are considered at the same 
 time.</p>
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