Au+Au 200GeV

Last BUR under the assumption of 22 cryo-weeks for Au+Au 200 and pp510. 

run period of Au+Au collisions at at √sNN = 200 GeV, integrating 10 nb-1 of luminosity with rare triggers for Upsilon states, gamma-jet correlations, B->J/ψ and J/ψ production, and 2 billion minbias events for Λc and differential studies of charm flow and correlations. A total integrated luminosity of over 20nb-1 with the combination of run14 and run16 provides the necessary statistics for a measurement of each of the three Upsilon states. We also request to collect 2 billion minimum-bias Au+Au collision events at √sNN = 200 GeV in Run16. A new set of the inner HFT (PXL layers) with Aluminum cables will be installed for run16 with significantly reduced multiple-scattering. We have also proposed to improve the effectiveness of online vertex selection of collisions within the HFT fiducial coverage. The effective figure of merit in terms of statistics for the signal increases by about a factor of 6 for low pT D0 in comparison to the dataset taken in run14 due to reduced cabling material and improved online vertex selection. This significant improvement will allow us to perform differential studies on the charmed hadron yields, flow and correlations in several centralities. More importantly, the high statistics and the improved pointing resolution for low momentum tracks will make the Λc measurement feasible (cτ of Λc ~ 60 μm).

The file discussion issues on the HI running for run-16 is attached in this page.
FV

B->J/Psi projection

Comparison of B->e, B -> D and B->J/psi decay kinematics:

slide 5 in https://drupal.star.bnl.gov/STAR/system/files/1105BMeson_PythiaStuday_BNL_Guannan.pdf by Xin Doing and Guannan Xie

Projectios for B->J/psi R_AA

Projections for B->J/psi R_AA for BUR16/17 by  Bingchu Huang
Projections for B->J/psi R_AA for BUR16/17 with separated uncertainties from Au+Au and p+p baseline by Bingchu Huang

 

 

Projectios for B->J/psi R_CP:

R__CP (0-10%/ 40-60%)

R__CP (0-10%/ 60-80%)

BUR15 Executive Summary

The STAR Collaboration makes the following two-year beam-use proposal, in order to achieve its spin and relativistic heavy ion physics goals on a timescale consistent with intense international interest and competition in these areas, as well as to utilize RHIC beams effectively, taking full advantage of recent improvements in machine and detector capability.

Table 1 1: Scenario I-A: 22 cryoweeks for Run 17 with Isobar sources (Zr, Ru)

STAR’s top priority is to capitalize on the successful installation and operation of the Heavy Flavor Tracker (HFT) and Muon Telescope Detector (MTD) in runs 14 and 15. We request 13 weeks of Au+Au collsions at √s = 200 GeV to collect rare triggers for Upsilon states, gamma-jet correlations, B-->J/Psi and J/Psi production, as well as 2 billion minbias events for Lambda_c and differential studies of charm flow and correlations. The combination of the run 14 and run 16 will allow for measurements of each of the three Upsilon states. The heavy flavor and quarkonium program must be completed to fulfill STAR’s scientific program with the newly HFT and MTD upgrades before BES-II.

STAR’s second priority is to make the first significant measurement of the Sivers sign change and non-perturbative evolution effects in transverse momentum distributions via reconstruction of W+-, Z, direct photon and Drell-Yan single spin asymmetries in transversely polarized √s = 500 GeV p+p collisions. The sign change measurement is a fundamental test of QCD and is being pursued by other experiments, making a timely measurement imperative.

STAR’s third priority is to clarify the interpretation of the observed signatures of the chiral magnetic, wave and vortical effect by making measurements that disentangle signal from background v2 effects. We request a 3 week run each for Ruthinuium (Ru+Ru) and Zirconium (Zr+Zr) collisions. This choice of nuclei is ideal as it allows for a variation in magnetic field at a maximum of 10%, while keeping nearly all other parameters the same. This decisive measurement of the ratio of charge separation in the isobar while reducing the flow background to minimum will greatly advance our understanding of the chiral magnetic effect and has fundamental impact beyond the field of high-temperature QCD.  

Table 1 2: Scenario I-B: 22 cryoweeks for Run 17 for the case where the Ru-96 source cannot be procured. 

Our next priority is to take data at lower beam energies. There are two programs in our requests in this category:
a) Au+Au collisions at 62 GeV for measurements of inclusive jets and charm spectrum at low energy.
With newly developed analysis techniques, an inclusive jet measurement is possible with minimum-bias data in Au+Au collisions. We have recently extended the measurement to Au+Au at 62GeV with limited statistics from run 10. We request 4 (5) weeks of Au+Au collisions at this energy for an inclusive jet RCP measurement. This will also provide a measurement of D0 spectrum from HFT.
b) d+Au and p+p collisions at low energies for study of onset of high-pt hadron nuclear modification due to jet quenching.
STAR has produced a systematic measurement of RCP of inclusive hadrons as a function of momentum from all the beam energies taken at RHIC. The data has shown a systematic increase of RCP from less than unity to significantly above unity when the beam energy varies from top energy of 200 GeV to 7.7 GeV. A combination of d+Au collisions and p+p collisions at energies where RCP is around unity will help us address the onset of final-state hadron suppression.

Table 1 3: Scenario II: 15 cryoweeks for Run 17 (assume Isobar sources not possible in run16)

In this beam use request the STAR Collaboration presents five compelling scientific programs for the upcoming RHIC runs 16 and 17. We discuss the highlights from the scientific publications, on-going analyses and detector performance from recent runs. We have also outlined the planned upgrades in the next few years in preparation for the Beam Energy Scan II.

Chiral Magnetic Effect theory and data projections

Hi, Zhangbu and all

I've received the magnetic field calculation results for isobar collisions from the theorists, http://www.star.bnl.gov/protected/bulkcorr/rexwg/flow/Parity/CuAu/By_cent.pdf

and I made a projection of our measurements.
http://www.star.bnl.gov/protected/bulkcorr/rexwg/flow/Parity/CuAu/PlotIsobar.gif

If we have 250M minbias events in each case, there will be a sweet zone of 20-50% centrality,
where the difference between Ru+Ru and Zr+Zr is a 3 sigma effect (combining centralities).

Gang Wang
Department of Physics & Astronomy UCLA

BUR writeup:
summary of the experimental study on chiral magnetic effect

Highlights and Accomplishments since last BUR

Low Energy Reference datasets

Au+Au62 ( I think PHENIX is proposing He3+Au for run16 at various energies)
Daniel, Alex and Helen on jets and HF 
Do we need pp reference or all out for Au+Au

p+A 

Helen, Cebra and Alex on R_PA, flow (lower energies)?  
Elke on Spin 

dielectron: 
https://drupal.star.bnl.gov/STAR/blog/yiguo/error-projection-196-dau-die-spectra 

Luminosity projections and Discussions

  new CAD projection:
CAD Projection in 04/17/2015

NPE in Au+Au 62.4 GeV - current results and prospects for run 16

NPE spectra and v2 results from Au+Au 62.4 GeV run 2010

Slides 18 - 21 in Recent Open Heavy Flavor Results from STAR (RHIC & AGS Annual Users' Meeting 2014)

Prospects for NPE meausrements in Au+Au 62.4 GeV in run 16

(based on inputs from Mustafa Mustafa and James Dunlop)

Attached are ratio plots from theory calculations. The total charm cross-section is down by a factor of 4-5. However the pT dependence is not trivial.

The pT of charm quarks is, consequentially, harder at 200 GeV. For R_cp measurement it means a factor of 15-20 drop in cross-section in the interesting pT region (4-10 GeV/c).
For NPE v2 the harder spectra at 200 GeV implies that the NPE cross-section is down by a factor of 10 at low electron pT due to the feed down from higher pT.

Regarding the background, the NPE background is down by only a factor of 2 (with some pT dependence) from 200 to 62GeV.

Taking the projections for top energy of min/max = 2.2 nb^-1/ 3.6 nb^-1  /week (take the middle, say 3 nb^-1) at 200 GeV, then scaling down by E^2, would expect
~1.5 nb^-1 in such a run, delivered.  Take 70% live, ~1 nb^-1.

So a factor of 5 or so possible vs. what was triggered in Run 10, also perhaps somewhat better with a narrower vertex distribution.
Not clear whether that pushes us over the top to make the HT trigger useful. It is unlikely, especially with the worse NPE S:B with the HFT.

Raw inclusive electron spectrum from Run 10 data:

Charm cross section in p+p 200 GeV vs p+p 62.4 GeV

Run16 and AuAu62 GeV estimate

I had one presentation in the last Nov collaboration meeting talking about the Run16 and some quick estimate on the D0 v2 from 5 weeks of AuAu62 GeV

Au+Au62 estimate from HFT

comments and feedbacks

 -----Original Message-----

From: Sorensen, Paul
Sent: Friday, May 15, 2015 1:31 AM
To: Xu, Zhangbu
Subject: Re: [Starpapers-l] STAR Beam Use Request for run 16 and 17 (ready for collaboration feedback)

I believe there is an error in table 5-2. Isn’t CME supposed to be larger > in Ru+Ru and Zr+Zr? It’s listed as smaller < now.

-----Original Message-----
From: Carl Gagliardi [mailto:c-gagliardi@tamu.edu]
Sent: Thursday, May 14, 2015 4:05 PM
To: Xu, Zhangbu
Cc: rfatemi@pa.uky.edu; Aschenauer, Elke; 'Carl Gagliardi'
Subject: RE: [Starpapers-l] STAR Beam Use Request for run 16 and 17 (ready for collaboration feedback)

Hi Zhangbu (cc Renee and Elke):

I've made it through Sections 1-3 of the Version 12 draft BUR.  I systematically tried to ignore minor typos, etc., that the PAC members should be able to read over easily.  With that "constraint", I only have a few comments or suggestions so far:

--  General remark:  The "Highlights" section is written in a very brief style.  That's a good thing!  But it means the knowledge that the PAC members bring to the document will be critical for them to understand everything that's discussed.  (I admit that I had difficulty following some of the heavy ion highlights.)  During your PAC talk, I could imagine that you might get one or two "what's this mean?" questions from members who had their interest tweaked by some figure.  Be prepared.

--  Pg 13, Fig 2-9 caption:  j_T is ~ Delta R * z * pT_jet.  (The "* z" is

missing.)

--  Pg 16, 2nd last line:  "... into a new ERA of lower x ..."  (Admittedly, this is just a typo.  But I simply couldn't read past it!)

--  Pg 33:  The upper paragraph says Fig 3-2 is from p-Au running.  The figure caption says it's from p+p.  I suspect the figure caption is correct.

--  Pg 36:  At present, there is nothing in Sect 3.2 "Dataset for inclusive jet and dijet A_LL".  I'm probably the internal expert here.  Should I prepare a brief paragraph and update our standard Runs 9+15 projection plot for insertion here?

I'll drop you another note after I've made it through the Runs 16&17 requests sections.  I might (or might not) also have some retrospective suggestions for the Executive Summary at that time.

Carl

pp,pA BUR

 request and projections for pp,pA