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<div class="">Dear Colleague,</div>
</span>
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<div class=""><span itemprop="description" class="">
<h1 itemprop="name" class=""><span class=""
style="font-weight: normal; font-size: 12px;">We
are happy to announce the 2nd workshop on the
“Proton Mass; At the Heart of Most Visible
Matter”. </span><span class=""
style="font-weight: normal; font-size: 12px;">If
you are interested in the workshop scientific
program and believe you can contribute to one of
the scientific questions please contact the
organizers. Due to the limited space at the ECT*
attendance is by invitation only. </span></h1>
<div class=""><b class="" style="font-size: 14px;">Circular:</b></div>
<div class=""><span class="" style="font-size:
large;"><br class="">
</span></div>
<div class=""><span class="" style="font-size:
large;">2nd Workshop on The Proton Mass; At the
Heart of Most Visible Matter</span></div>
</span></div>
<div class=""><b class="" style="font-size: 14px;"><br
class="">
</b></div>
<div class=""><b class="" style="font-size: 14px;">Venue:
ECT*, Trento, Italy</b></div>
<div class=""><b class=""><br class="">
</b></div>
<div class=""><b class="" style="font-size: 14px;">Date:
April 3-7, 2017</b></div>
<div class=""><br class="">
</div>
<div class=""><b class="" style="font-size: 14px;">Motivation:</b></div>
<div class=""><span itemprop="description" class=""><br
class="">
</span></div>
<div class=""><span itemprop="description" class="">The
subject of understanding the proton mass in terms of
its constituents, as naive as it may sound, is of
paramount importance to the field of
Hadronic/Nuclear physics. The emergence of hadron
masses from quarks and gluons is one of the most
fascinating subjects in coherence physics and a
cornerstone of QCD. In a tour de force, calculations
of the baryon mass spectrum in lattice QCD has been
successfully carried out, however developing the
intuition of how the mass of each hadron emerges
finds many pathways as noticed in the workshop held
at Temple University in March of 2016 (<a
moz-do-not-send="true"
href="https://phys.cst.temple.edu/%7Emeziani/proton-mass-workshop-2016/"
class="">https://phys.cst.temple.edu/~meziani/proton-mass-workshop-2016/</a>).
How the mass of the proton emerges from its
constituents is a natural and familiar question
shared by many colleagues from other areas of
physics where the mass of key systems is commonly
described in terms of the mass of their
constituents. While the mass of a hadron in QCD is
an emergent phenomenon it is nevertheless important
to cast our answer in terms of the energy/mass of
the constituents in order to facilitate
communication with the public in a familiar way.
This is now crucial as the nuclear physics community
in the U.S. and elsewhere embarks in the
justification of building ever larger experimental
facilities in the quest of understanding QCD and the
structure of hadronic/nuclear matter from basic
principles. In the U.S. such a facility is the
electron ion collider (EIC) project which has been
endorsed by the US nuclear physics community as the
next construction project after the completion of
FRIB. The science justification of this project will
soon undergo an evaluation by a committee from the
US National Academy of Science to cement its <em
class="">raison d'être</em>. The quality and
importance of the problems addressed by nuclear
physics, especially those involving a true
understanding of the inner workings of QCD need to
identify connections and pathways to others areas of
physics. The ``mass of the proton" is one theme
amenable to emphasize what remains to be understood
in QCD as a worthwhile goal that can be appreciated
by the wider physics community not just the
practitioners of hadronic/nuclear physics.</span></div>
<div class=""><span itemprop="description" class=""><br
class="">
</span></div>
<div class=""><span class="" style="color: rgb(51, 0,
0); background-color: rgb(255, 255, 255); font-size:
14px;"><b class="">Scientific Program:</b></span></div>
<div class=""><span class="" style="color: rgb(51, 0,
0); background-color: rgb(255, 255, 255);"><br
class="">
</span></div>
<div class=""><span class="" style="color: rgb(51, 0,
0); background-color: rgb(255, 255, 255);">The
workshop</span><span class="" style="color: rgb(51,
0, 0); background-color: rgb(255, 255, 255);"> </span><span
class="" style="background-color: rgb(255, 255,
255);">will support a three-pronged theoretical
approach to the subject of the origin of hadron
masses with an added value on defining possible
measurements that would make whole the investigation
of the origin of the proton mass. This theoretical
approach combined with experimental measurements
should in principle allow for a deeper understanding
of this complex subject. Direct lattice QCD
calculations of hadron masses, mass decompositions</span><font
class="" style="background-color: rgb(255, 255,
255);">,</font><span class=""
style="background-color: rgb(255, 255, 255);"> where
the role of the constituents are explored</span><font
class="" style="background-color: rgb(255, 255,
255);">, </font><span class=""
style="background-color: rgb(255, 255, 255);">as
well as phenomenological and approximated analytical
approaches would form the three legs supporting the
theory base of this workshop. Experiments aimed at
some specific pieces of this puzzle, for example the
individual terms in a decomposition of the mass in
terms of the constituents, could form a platform for
experimental measurements that will be pursued if at
all possible.</span></div>
<div class=""><span itemprop="description" class="">
<div class="" style="background-color: rgb(255, 255,
255);"><br class="">
</div>
<div class="" style="background-color: rgb(255, 255,
255);">1-How can lattice QCD help us explore the
role of "individual" constituents in making up the
hadron masses? For example we want to explore the
role of quark masses, in particular strange and
heavy quark masses contribute to the proton mass.<br
class="">
<br class="">
</div>
<div class="" style="background-color: rgb(255, 255,
255);">2- What can the decomposition in terms of
constituents teach us? Can we take advantage of
the non-uniqueness of the decomposition to cast it
in terms of intuitive physical and independently
measurable quantities?<br class="">
<br class="">
</div>
<div class="" style="background-color: rgb(255, 255,
255);">3- In the approximated analytical,
phenomenological or model approaches, how well can
we control the approximations? Examples are the
proton wave function, or the piN sigma term, how
to quantify or improve the approximations made and
how do different approaches compare with each
other? </div>
<div class="" style="background-color: rgb(255, 255,
255);"><br class="">
</div>
<div class="" style="background-color: rgb(255, 255,
255);">4- Identify new measurements that could be
pursued at existing or future facilities and<font
class="" color="#330000"> which </font>would
measure relevant observables closely linked to a
given decomposition and could effectively test our
assumptions. For example, measurements of the
J/\psi electro- and photo-production at threshold
at Jefferson Lab and the measurement of upsilon
electro- and photo-production at threshold at a
future Electron Ion Collider<br class="">
</div>
</span></div>
<div class=""><br class="">
</div>
<div class=""><b class="" style="font-size: 14px;">Websites:</b></div>
<div class=""><br class="">
</div>
<div class="">ECT* workshop webpage: <a
moz-do-not-send="true"
href="http://www.ectstar.eu/node/2218" class="">http://www.ectstar.eu/node/2218</a></div>
<div class=""><br class="">
</div>
<div class="">Scientific website: <a
moz-do-not-send="true"
href="https://www.jlab.org/indico/event/194/"
class="">https://www.jlab.org/indico/event/194/</a></div>
<div class=""><br class="">
</div>
<div class=""><b class="" style="font-size: 14px;">Registration:</b></div>
<div class=""><br class="">
</div>
<div class="">The official administrative registration
will be open on the ECT* webpage: <a
moz-do-not-send="true"
href="http://www.ectstar.eu/node/2218" class="">http://www.ectstar.eu/node/2218</a></div>
<div class=""><span class="date-display-start"
property="dc:date" datatype="xsd:dateTime"
content="2017-01-30T00:00:00+01:00"> starting<span
class="" style="font-size: 14px;"> </span>January
30, 2017</span> to <span class="date-display-end"
property="dc:date" datatype="xsd:dateTime"
content="2017-03-19T00:00:00+01:00"> March 19, 2017.</span></div>
<div class=""><br class="">
</div>
<div class=""><b class="" style="font-size: 14px;">Organizers:</b></div>
</div>
<div class=""><span class="" style="font-size: 14px;"><b
class=""><br class="">
</b></span>
<div class=""><span class="" style="font-size: 14px;">Zein-Eddine
Meziani( Temple Univ.)</span></div>
<div class=""><span class="" style="font-size: 14px;">Barbara
Pasquini (Univ. of Pavia)</span></div>
<div class=""><span class="" style="font-size: 14px;">Jianwei
Qiu (Jefferson Lab)</span></div>
<div class=""><span class="" style="font-size: 14px;">Marc
Vanderhaeghen (Univ. of Mainz)<br class="">
</span>
<div class=""><br class="">
</div>
</div>
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