Download - Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,
![Page 1: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/1.jpg)
Nuclear modification factor for identified hadrons at forward rapidity in Au+Au
reactions at 200GeVRadoslaw Karabowicz
for the BRAHMS Collaboration
Marian Smoluchowski Institute of Physics, Jagiellonian University, Kraków, Poland
![Page 2: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/2.jpg)
2 2
Data analyzed:Au+Au, p+p at sqrt(s_NN)=200GeV
BRAHMS experiment
Tracking Detectors
Magnets
![Page 3: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/3.jpg)
3
RICH Pid
3
RICH Pid – 3 sigma cut. In the overlapping regions Pid based on statistical weighting of Gaussian distibution in r.
p [GeV/c]
r [c
m]
m2 [GeV2/c4]
![Page 4: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/4.jpg)
4 4
Au+Au 200 AGeV pions
y-pT map coverage
Different colors –different angle and
field settings - trigger normalization- acceptance- tracking efficiency- Pid efficiency
![Page 5: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/5.jpg)
5 7
pT spectra
![Page 6: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/6.jpg)
6 6
RCP in Au+Au @ 200 AGeV
RCP [(d2NAu+Au/dpTdy)/<Ncoll>]0-
10%[(d2NAu+Au/dpTdy)/<Ncoll>]40-
50%
![Page 7: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/7.jpg)
7 6
RAA in Au+Au @ 200 AGeV
Increase of ratios with decreasing
centrality
Pions and kaons ratios flat
Protons show Cronin peak at pt=2
RAA d2NAu+Au/dpTdy
<Ncoll> d2Nppinel/dpTdy
7
![Page 8: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/8.jpg)
8 8
RAA comparison with RCP
RCP and RAA are consistent for pions
and kaons
For protons RCP shows suppression, while RAA shows enhancement
![Page 9: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/9.jpg)
9 9
RAA for pions at forward
rapidities agrees
with RAA at midrapidit
y
RAA at y=0 and y=3.1
![Page 10: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/10.jpg)
10 10
RCP for pions at forward
rapidities copies the behaviour of RCP at
midrapidity
RCP at y=0 and y=3.1
![Page 11: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/11.jpg)
11 11
For protons however data
at forward rapidity show
significant suppression
in RCP
RCP at y=0 and y=3.0
![Page 12: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/12.jpg)
12 12
RdAu compared with RAA
![Page 13: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/13.jpg)
13
• identified particle yields has been measured by BRAHMS at forward rapidity for Au+Au and p+p collisions
• RAA shows significant suppression for pions and kaons, but for protons it shows enhancement
• RCP and RAA are consistent for pions and kaons, but deviate for protons
• no difference in pion RAA between midrapidity (PHENIX 0) and forward rapidity (BRAHMS ++-/2) consistent with surface jet-emission
• baryons’ RCP shows suppression at forward rapidities in contrast with midrapidity
• pions RAA shows stronger suppression as compared to RdAu
13
SUMMARY
![Page 14: Radoslaw Karabowicz for the BRAHMS Collaboration Marian Smoluchowski Institute of Physics,](https://reader036.vdocument.in/reader036/viewer/2022070400/568134b8550346895d9bd699/html5/thumbnails/14.jpg)
14 14
The BRAHMS CollaborationI.Arsene11, I.G. Bearden6, D. Beavis1, S.Bekele10, C. Besliu9, B. Budick5, H.
Bøggild6 ,
C. Chasman1, C. H. Christensen6, P. Christiansen6, R.Clarke9, R.Debbe1,
J. J. Gaardhøje6, K. Hagel7, H. Ito1, A. Jipa9, J. I. Jordre9, F. Jundt2, E.B.Johnson10,
J.I.Jordre8, C.Jørgensen6, R. Karabowicz3, E. J. Kim10, T.M.Larsen6, J. H. Lee1,
Y. K.Lee4, S.Lindal11, G. Løvhøjden2, Z. Majka3, M. Murray10, J. Natowitz7, B.S.Nielsen6,
D.Ouerdane6, R.Planeta3, F. Rami2, C.Ristea6, O.Ristea9,
D. Röhrich8, B. H. Samset11, S. J. Sanders10, R.A.Sheetz1, P. Staszel3, T.S. Tveter11,
F.Videbæk1, R. Wada7, H.Yang8, Z. Yin8, and I. S. Zgura9
1Brookhaven National Laboratory, USA, 2IReS and Université Louis Pasteur, Strasbourg, France3Jagiellonian University, Cracow, Poland,
4Johns Hopkins University, Baltimore, USA, 5New York University, USA6Niels Bohr Institute, University of Copenhagen, Denmark
7Texas A&M University, College Station. USA, 8University of Bergen, Norway 9University of Bucharest, Romania, 10University of Kansas, Lawrence,USA
11 University of Oslo Norway
48 physicists from 11 institutions