List for the 2014 Hot QCD White Paper Writing Group

["Ralf F. Rapp" <rapp AT comp.tamu.edu>]

Dear Bill, dear Fellow authors,
I agree with the strategy of waiting for ~2 weeks and then posting a "final" 
update.
I will attend to Nora's comments and discuss suitable updates with Tony and 
whoever
else would like to give input on those (just let me know).
As for how to implement them in the document, I am happy to either do it 
together with
Tony, or send updated text passages (+ new references) to you (Bill), as you 
prefer.
Cheers,
Ralf 

----- Original Message -----
From: "W.A. Zajc" <zajc AT nevis.columbia.edu>
To: "Writing Group List for the 2014 Hot QCD White Paper" 
<hot-qcd-whitepaper-l AT lists.bnl.gov>
Sent: Wednesday, February 11, 2015 7:10:25 AM
Subject: [Hot-qcd-whitepaper-l] Fwd: 1502.02730

Hello all (again): 

In a message to Krishna a day or too ago I made a successful theoretical 
prediction - that when the White Paper was posted we would receive “please 
reference me too” messages. Below is the first of what I hope is not many. 

All of the remarks below are concentrated on the Quarkonia section. Tony and 
Ralf - can you address these? If you prefer for me to upload any edits (that 
you would suggest) and new references to github, that is OK - I’ve had a lot 
of practice recently. 

I am sending this to the list rather than just to Tony and Ralf because there 
is a general issue of how we handle such requests. Your thoughts on this 
would be appreciated. For starters, I don’t intend this to be a ‘living 
document’. At some point in the near-future we will stop updating it. We 
would obviously want to fix mistakes and misstatements. 

Best regards, 

Bill 


————————————— 
W.A. Zajc 
I.I. Rabi Professor of Physics 
Columbia University 
New York, NY 10027 
————————————— 






Begin forwarded message: 

Date: February 11, 2015 at 7:06:10 AM EST 
From: Nora Brambilla < nora.brambilla AT ph.tum.de > 
To: zajc AT nevis.columbia.edu 
Cc: nora.brambilla AT ph.tum.de 
Subject: 1502.02730 

Dear Authours of 1502.02730, 
I was seeing and reading with pleasure your big opus! Let me congratulate 
with you for this Hot QCD White Paper that I hope will have a large and 
positive impact for our research. Precisely because I hope that this document 
will have a positive impact 
on the development of our field I am writing you to insert some changes that 
will improve the text. 
In particular I have some relevant comments about the text that you have 
written on quarkonium dissociation that calls for some revision along the 
lines given below: 

1) at very bottom of pag. 31 you say that the study of quarkonia in matter is 
carried on with lattice (first principle) and with models. 
This is not true, such study is carried on with lattice and with effective 
field theories of QCD and then on a phenomenological level with models. 
Plaese improve that paragraph. 


2) top of pag. 32 you speak about the free energy and then abouts its use in 
a Schrodinger eq. 
It has been recently shown ( Phys.Rev. D82 (2010) 074019, : arXiv:1007.5172) 
(using QCD at small coupling, i.e. effective field of QCD at small coupling) 
that the free energy is not the quark-antiquark potential at finite T. There 
is no reason for which this result should change at large coupling. So there 
is 
no reason to use the free energy as a potential in a schrodinger eqiation. 
This is the latest status and should be reported. 


3)in the third paragraph of 32 starting with "Lattice computations also" 
you say: 
"In the bottomonium sector one can additionally utilize nonrelativistic 
heavy quark effective theory [183]" 
183 is a lattice calculation of the spectrum. They do do not use heavy quark 
effective theory but they use nonrelativistic QCD. In particular they compare 
their lattice result to our calculations of the thermal bottomonium spectrum 
made with potential nonrelativistic QCD in 
JHEP 1009 (2010) 038 : arXiv:1007.4156 
(at small coupling in he continuum) and they find agreement with us. 
The sentence should be modified and our reference added. 


3) when in the last part of pag. 32 you listed the approached used to obtain 
the quark antiquark in medium potential you cannot leave out the effective 
field theory approach that was the FIRST one obtaining the imaginary part in 
the potential. You quoted only [191] but these are lattice calculations of 
Wilson loop that tried to find on the lattice an imaginary part of the 
potential using the Wilson loop after the 
work done in: 
--first in one particular case using the Wilson loop in 
JHEP 0703 (2007) 054 hep-ph/0611300 
--and then in general in all the dynamical situations in an effective 
field description Phys.Rev. D78 (2008) 014017 arXiv:0804.0993 



Again I would like to thank you for working at such formidable document that 
will serve well our field, I hope to have contributed my little part to it 
with this email ;-) 

with my warmest regards and greetings 
nora Brambilla 

------------------------------------------------------------------------ 
Nora Brambilla Tel.: +49-89-289-123-53 
Physik-Department T30f 
http://einrichtungen.physik.tu-muenchen.de/T30f/ 
Technische Universitaet Muenchen Secretary: Susanne Tillich 
James-Franck-Str. 1 Tel.: +49-89-289-123-58 
85747 Garching Fax: +49-89-289-123-25 


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