Hi all,

I did not follow up whether anyone was willing to read this paper. Here are my comments. The deadline is Thursday.

Cheers,

Patrick

//=========================================

Dear Jibo He, Yuehong Xie, Yuanning Gao, Jiesheng Yu, Daniel Vieira

Congratulations for this important measurement. Here are the comments from the Nikhef group.

Physics:
 - We miss the "money plot", i.e. the background-subtracted efficiency corrected plot of the ratio of the Xicc to Lb yield ratio in log scale. That should follow an exponential, which would convince readers that you actually fit a lifetime and that you have acceptance under control. It would also visualise the actual value being fitted. Now the result comes as a number at the end and there is no plot that backs it up.

General:
 - You should explain you do a binned analysis. This is implied in L.96 and of course explained in Refs. [22-26] but should be stated.

Line-by-line:
Abstract: performed -> described/presented
L.4: remove "which is one of the 4 fundamental interactions"
L.6: Xicc++ and Xicc+ baryons with quark content ccu and ccd respectively. (so to say that ccd are quarks).
L.8: 1,050 -> 1050 (template guideline 17). We suggest to move [1-10] here.
L.15: that -> this
L.34: one -> the result. decay-time.
L.59: remove "in a well understood way, "
Eq.1: m([pKpi]_\Lc) is undefined. What is this quantity? Explain below. Why is the simple mass called m' and the complicated form m?
L.79: though -> although
L.80: guideline 17
L.86: Here you need to explain why m biases the decay etime while m' does not. to avoid -> in order to avoid
Fig.2: a log scale would be show the effect you want to show. Caption : () go before what they refer to.
L.96: bin mentioned here.
Fig.3: The scale is arbitrary, but values of 2 are still strange. Caption : () go before what they refer to.
L.119: Note that -> Here
L.130: double Gaussian is undefined. You mean sum of two Gaussian funtions?
Fig.4: what is a "rate average" ?

Ref [21] and [44] are the same.



On 03/05/18 09:39, Patrick Koppenburg wrote:

Dear all,

We have a new paper assigned to us. The lifetime of the doubly charmed and doubly charged baryon, which helps addressing some issues between us and SELEX. Any volunteer to collect comments?

Thanks

Patrick



-------- Forwarded Message --------
Subject: First circulation of publication draft for PAPER-2018-019, Measurement of the lifetime of the doubly charmed baryon $\Xi_{cc}^{++}$
Date: Thu, 3 May 2018 09:36:14 +0200
From: Patrick Koppenburg <patrick.koppenburg@cern.ch>
To: LHCb General mailing list <lhcb-general@cern.ch>
CC: LHCb-PAPER-2018-019-reviewers@cern.ch 


Dear Colleagues,

A draft paper is available for your comments.
Team leaders, verify the author list and check for reading obligations. 
The following institutes are requested to make institutional comments 
via the CDS link given below:

Birmingham, United Kingdom
Ruprecht-Karls-Universitaet Heidelberg, Germany
NIKHEF VU, The Netherlands
LAPP, Annecy-Le-Vieux, France
UFRJ, Rio de Janeiro, Brazil
Cincinnati, United States

Title : Measurement of the lifetime of the doubly charmed baryon 
$\Xi_{cc}^{++}$
Journal : PRL
Contact authors : Jibo He, Yuehong Xie, Yuanning Gao, Jiesheng Yu, 
Daniel Vieira
Reviewers : Angelo Di Canto (chair), Steve Blusk
EB reviewer : Stefania Vecchi
EB readers : Roland Waldi, Roberta Santacesaria
Analysis note : ANA-2017-032
Deadline : 17-May-2018
e-group : lhcb-paper-2018-019-reviewers
CDS link : https://cds.cern.ch/record/2316030
Authors : LHCb
Twiki : https://twiki.cern.ch/twiki/bin/view/LHCbPhysics/XiccLifetime

It is the responsibility of the contact authors to provide replies to 
all comments made. Subsequent modifications to the draft will be made in 
consultation with the reviewers and during the EB reading. Following 
this, there will be a final meeting of the editorial board, with contact 
authors and reviewers present, when final decisions will be made. As the 
last step, the collaboration will be given a final opportunity to 
comment during a 'silent approval' period.

You can find all paper and conference report drafts open for comments 
via the EB web-page, by clicking on Current Drafts:

http://lhcb.web.cern.ch/lhcb/lhcb_page/collaboration/organization/editorial_board/default.html 


Best regards,
Patrick

-- 
========================================================================
 Patrick Koppenburg                                   Nikhef, Amsterdam
 http://www.nikhef.nl/~pkoppenb/#contact




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-- 
========================================================================
 Patrick Koppenburg                                   Nikhef, Amsterdam
 http://www.nikhef.nl/~pkoppenb/#contact