<div dir="ltr"><br><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Richard J Hill</b> <span dir="ltr"><<a href="mailto:richardhill@uchicago.edu">richardhill@uchicago.edu</a>></span><br>
Date: Tue, Feb 18, 2014 at 9:01 PM<br>Subject: Fwd: [theory-seminar] REMINDER PARTICLE THEORY SEMINAR TOMORROW<br>To: <a href="mailto:johnda@uchicago.edu">johnda@uchicago.edu</a>, Yasuyuki Okumura <<a href="mailto:Yasuyuki.Okumura@cern.ch">Yasuyuki.Okumura@cern.ch</a>>, Bjoern Penning <<a href="mailto:penning@cern.ch">penning@cern.ch</a>><br>
<br><br><div style="word-wrap:break-word">Hi, <div>fyi, the following theory seminar of Tim Cohen might be of interest to HEP experimentalists. </div><div><br></div><div>Best,</div><div>Richard</div><div><br></div><div>
<br>
</div><div><div><br><div>Begin forwarded message:</div><br><blockquote type="cite"><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><span style="font-family:'Helvetica';font-size:medium;color:rgba(0,0,0,1.0)"><b>From: </b></span><span style="font-family:'Helvetica';font-size:medium">Beth An Nakatsuka <<a href="mailto:bnakatsuka@theory.uchicago.edu" target="_blank">bnakatsuka@theory.uchicago.edu</a>><br>
</span></div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><span style="font-family:'Helvetica';font-size:medium;color:rgba(0,0,0,1.0)"><b>Subject: </b></span><span style="font-family:'Helvetica';font-size:medium"><b>[theory-seminar] REMINDER PARTICLE THEORY SEMINAR TOMORROW</b><br>
</span></div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><span style="font-family:'Helvetica';font-size:medium;color:rgba(0,0,0,1.0)"><b>Date: </b></span><span style="font-family:'Helvetica';font-size:medium">February 18, 2014 9:03:40 AM CST<br>
</span></div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><span style="font-family:'Helvetica';font-size:medium;color:rgba(0,0,0,1.0)"><b>To: </b></span><span style="font-family:'Helvetica';font-size:medium">Seminar List <<a href="mailto:theory-seminar@listhost.uchicago.edu" target="_blank">theory-seminar@listhost.uchicago.edu</a>><br>
</span></div><br>
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REMINDER PARTICLE THEORY SEMINAR TOMORROW<br>
<br>
DATE: WEDNESDAY FEBRUARY 19, 2014<br>
<br>
TIME: 1:30P.M. <br>
<br>
PLACE: ACC 211 <br>
<br>
SPEAKER: <span>Tim Cohen</span>,
SLAC<br>
<br>
TITLE:
<span>“</span><span>Jet Substructure by Accident</span><span>”</span>
<br>
<br>
ABSTRACT:
<span style="font-size:12.0pt;font-family:Times">We propose a
new search strategy for high-multiplicity hadronic final states.
When new particles are produced at threshold, the distribution of
their decay products is approximately isotropic. If there are many
partons in the final state, it is likely that several will be
clustered into the same large-radius jet. The resulting jet
exhibits substructure, even though the parent states are not
boosted. This “accidental” substructure is a powerful discriminant
against background because it is more pronounced for
high-multiplicity signals than for QCD multijets. We demonstrate
how to take advantage of accidental substructure to reduce
backgrounds without relying on the presence of missing energy. As
an example, we present the expected limits for several R-parity
violating gluino decay topologies. This approach also is
amenable to a novel method for determining QCD predictions using
templates -- probability distribution functions for jet
substructure properties as a function of kinematic inputs.
Templates can be extracted from a control region and then used to
compute background distributions in the signal region. Using
Monte Carlo, we will demonstrate the procedure with two case
studies and show that the template approach effectively models the
relevant QCD background. This work strongly motivates the
application of these techniques to LHC data.</span><u></u><u></u>
<br>
<br>
<br>
</div>
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