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Hello al,<br>
Some interesting response and thoughts on the Science paper for the
holidays.<br>
Volker<br>
<br>
<br>
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<td>Fwd: Fwd: [nu-xsec newsletter] arXiv:1412.0138, momentum
imbalanced Fermi systems, SRC vs. MEC</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Tue, 23 Dec 2014 09:03:35 -0500</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th>
<td>Larry Weinstein <a class="moz-txt-link-rfc2396E" href="mailto:lweinste@odu.edu"><lweinste@odu.edu></a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Reply-To:
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<td><a class="moz-txt-link-abbreviated" href="mailto:weinstein@odu.edu">weinstein@odu.edu</a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">To: </th>
<td>Hugh Montgomery <a class="moz-txt-link-rfc2396E" href="mailto:mont@jlab.org"><mont@jlab.org></a>, Rolf Ent
<a class="moz-txt-link-rfc2396E" href="mailto:ent@jlab.org"><ent@jlab.org></a>, Bob Mckeown <a class="moz-txt-link-rfc2396E" href="mailto:bmck@jlab.org"><bmck@jlab.org></a>,
Volker Burkert <a class="moz-txt-link-rfc2396E" href="mailto:burkert@jlab.org"><burkert@jlab.org></a>, Or Chen
<a class="moz-txt-link-rfc2396E" href="mailto:or.chen@mail.huji.ac.il"><or.chen@mail.huji.ac.il></a></td>
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Dear Mont, Rolf and Bob,<br>
<br>
We thought you might be interested in seeing that our Science
paper is attracting a lot of interest in the neutrino community.<br>
<br>
Sincerely,<br>
Larry and Or<br>
<br>
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<div class="gmail_quote">---------- Forwarded message
----------<br>
From: <b class="gmail_sendername">Teppei Katori</b> <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:t.katori@qmul.ac.uk">t.katori@qmul.ac.uk</a>></span><br>
Date: Mon, Dec 22, 2014 at 2:01 PM<br>
Subject: [nu-xsec newsletter] arXiv:1412.0138, momentum
imbalanced Fermi systems, SRC vs. MEC<br>
To: Neutrino Cross-Section Newsletter <<a
moz-do-not-send="true" href="mailto:nu-xsec@qmul.ac.uk">nu-xsec@qmul.ac.uk</a>><br>
<br>
<br>
Hi all,<br>
<br>
There is a cool paper from JLab folks (Or Hen et al),<br>
<a moz-do-not-send="true"
href="http://arxiv.org/abs/arXiv:1412.0138"
target="_blank">http://arxiv.org/abs/arXiv:1412.0138</a><br>
<br>
Conclusion, due to short range correlation (SRC),<br>
in neutron rich nuclei, averaged momentum of protons is
higher than neutrons.<br>
<br>
The key of this is, SRC correlation is predominantly
neutron-proton (n-p) pair.<br>
Also, they have higher momentum over Fermi sea.<br>
Because of this, neutrons have lower averaged momentum in
neutron rich system.<br>
I like this cartoon explanation using dance party (Fig 1).<br>
Here, girls are neutrons and boys are protons.<br>
Say, the party is dominated by girls, then average boys
dance more than average girls,<br>
because boy-girl interactions make boys to dance more.<br>
(OK, I don't need your counterexample from your party
experiences!).<br>
<br>
I found their signal and backgrounds definition is very
interesting (Fig. S13, from supplement)<br>
<a moz-do-not-send="true"
href="http://www.sciencemag.org/content/346/6209/614/suppl/DC1"
target="_blank">http://www.sciencemag.org/content/346/6209/614/suppl/DC1</a><br>
Apparently, MEC is the background of SRC measurement.<br>
IC (isobar configuration) is the another kind of background
for SRC measurement.<br>
This process is what ArgoNeuT people think as the origin of
their "hammer" events.<br>
<a moz-do-not-send="true"
href="http://www.lists.qmul.ac.uk/sympa/arc/nu-xsec/2014-05/msg00007.html"
target="_blank">http://www.lists.qmul.ac.uk/sympa/arc/nu-xsec/2014-05/msg00007.html</a><br>
So we identify IC as an exclusive channel but we don't
distinguish SRC and MEC?<br>
At low x, MEC is dominant. That is why JLab experiments
choose special kinematics (x > 1.2)<br>
to suppress MEC to measure SRC.<br>
This makes me to think how much measured SRC features at
high x<br>
are applied to nucleons to simulate MEC, which is low x
physics.<br>
But both Martini et al and Carlson et al pointed out
nucleons in MEC are also n-p pairs.<br>
Carlson et al also showed SRC is the source to get
cross-section enhancement.<br>
So SRC seems the source of MEC..., hmm.<br>
<br>
Seems to me electron scattering people studied these many
years.<br>
For example, Ryckebusch et al showed SRC and MEC have very
similar final state nucleon distributions.<br>
<a moz-do-not-send="true"
href="http://arxiv.org/abs/nucl-th/9911054"
target="_blank">http://arxiv.org/abs/nucl-th/9911054</a><br>
(so again, you have to go large x region to isolate SRC).<br>
<br>
Anyway, it looks SRC is the golden age.<br>
It is important for neutrino cross-section,<br>
astrophysics (neutron rich system, this paper),<br>
high energy physics (EMC effect),<br>
<a moz-do-not-send="true"
href="http://arxiv.org/abs/1202.3452" target="_blank">http://arxiv.org/abs/1202.3452</a><br>
even cold atom is related to SRC...<br>
<a moz-do-not-send="true"
href="http://arxiv.org/abs/1407.8175" target="_blank">http://arxiv.org/abs/1407.8175</a><br>
<br>
Best,<br>
Teppei<br>
-----------------------------------------------<br>
Dr. Teppei Katori<br>
Queen Mary University of London<br>
e-mail: <a moz-do-not-send="true"
href="mailto:t.katori@qmul.ac.uk">t.katori@qmul.ac.uk</a><br>
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-- <br>
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<div dir="ltr">
<div>
<div dir="ltr"><span style="color:rgb(102,102,102)">Or
Hen,</span><br style="color:rgb(102,102,102)">
<span style="color:rgb(102,102,102)">Particle physics
department,</span><br style="color:rgb(102,102,102)">
<span style="color:rgb(102,102,102)">Tel-Aviv
university.</span><br style="color:rgb(153,153,153)">
<a moz-do-not-send="true"
href="https://www.jlab.org/%7Eorchen"
target="_blank">https://www.jlab.org/~orchen</a></div>
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