y ion physics in the 2020s MIT Oct 2829 2016 What can recent and future jet results teach us about the nature of QGP XinNian Wang CCNULBNL Properties of QGP different scales 2 to explore the properties and ID: 787989
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Slide1
1
Recent RHIC and LHC results and their implications for heav
y ion physics in the 2020’s
MIT, Oct 28-29, 2016
What can recent and future jet results teach us about the nature of QGP?
Xin-Nian Wang
CCNU/LBNL
Slide2Properties of QGP @ different scales
2
… to explore the properties and
P
hases of quark and gluon matterIn the high temperatures of the e
arly universe and ...
Long range plan for Nuclear Science 2015
Slide3What properties
of QGP jets probe
Space-time profile:EOS: Bulk transport: EM response: Jet transport:…
3
Slide4Factorization
and evolution of qhat
NLO twist-four in DIS and DY4
C
ancellation of
infrared
divergenceFactorization of the collinear
divergence
PRL 112, 102001(2014
)
arXiv:
1605.07175 (PRC)
Structure of the medium at different scales
Slide5Jet
transport coefficient
JET Collaboration: Phys.Rev. C90 (2014) , 014909
RHIC
LHC
Slide6T-dependence of jet transport coefficient ?
JET Collaboration:
Phys.Rev. C90 (2014) no.1, 014909
Slide7T-dependence of jet transport coefficient ?
Scan over the initial T at RHIC and LHC higher energies
Explore energy (scale) dependence
JET Collaboration:
Phys.Rev. C90 (2014)
014909
Slide8Constraints on qhat
from current and future jet measurements Single inclusive jet suppression
Dijet and gamma asymmetry Jet profile and fragmentation functionsJet induced medium excitation Flavor dependence of jet quenching (qhat)8
Slide9Linear Boltzmann Transport (LBT)
Elastic and radiative
processes Include medium recoilUse 3+1D e-by-e hydro9
LBT simulations
g
amma-jet
Single jet
XNW & Zhu,
PRL
111 (2013
),
062301
He,
Luo
, XNW & Zhu, PRC91 (2015) 054908;
Cao
,
Luo
, Qin & XNW, PRC94 (2016) 014909
CMS
preliminary
Slide10Coupled Linear Boltzmann Jet
Transport Hydro
10
Jet quenching + medium excitation
Slide11pT broadening and jet energy loss
11
(from center of central Pb+Pb)
Slide12pT broadening and jet energy loss
12
Doga Gulhan
(HP2016)
Slide1313
p
T
broadening and jet energy losspreliminary
preliminary
Slide14Gamma-jet asymmetry
14
0-30%
0-30%
0-30%
Preliminary
Preliminary
Slide15Jet profile and fragmentation func
.
Jet profile with fixed energy is more sensitive to pt broadening than energy loss Jet fragmentation function with fixed energy is sensitive to soft radiation and jet induced medium excitation Parton hadronization (recombination) in mediumJet-induced medium excitation
15
Fragmentation function
jet transverse profile
Slide16Energy flow in gamma-jet events
16
2.76TeV
PP
2.76TeV
PbPb
0-30%
Preliminary
Slide17Gamma-hadron correlation
17
STAR
Preliminary
Slide18Effects of jet-induced medium excitations
18
Enhancement of soft hadrons at fixed
pt
Preliminary
Slide19Dihadron correlation @LHC
19
Xinye Peng
(HP2016)
near-side
away side
Slide20Gamma-hadron angular correlation
20
Sensitivity to shear viscosity? UE subtraction?
Preliminary
Slide21Flavor of jet quenching
21
Preliminary
Slide22Flavor of jet quenching
22
Preliminary
Slide23Flavor of jet quenching
23
Preliminary
Slide24Quasi-particles seen by heavy quarks
24
Mass effect: dead-cone in gluon radiation(Dokshitzer & Kharzeev (2001)
Smaller
radiative
energy loss(Should be similar to light quarks p
T>> M)
B
D
Detailed study of Interplay between elastic and
radiative
energy loss
Properties of quasi-particles in QGP
(close to
Tc
and at highest T )
Slide25Summary
Jet measurements at RHIC and LHC provides a wealth of constraints on jet transport coefficients Jet-induced medium excitation: constraints on bulk transport properties
Flavor dependence of jet quenching could probe structure of medium: (q, g, c, b)25
Slide2626
Slide27Backups
27
Slide28P
arton propagation in medium
p
....
k
Transverse momentum broadening:
Slide29Linear Boltzmann jet transport
Li, Liu, Ma, XNW
and Zhu, PRL 106
（
2010
）
012301
XNW and Zhu, PRL 111 (2013) 062301
Induced radiation
Slide30Medium mod. of frag function
30
Energy of reconstructed jet dominated by leading particle
Suppression of fragmentation functions relative to initial energy
XNW and Zhu, PRL 111(2013)062301
Seen in CMS & ATLAS single jets
XNW, Huang &
Sarcevic
(1996)
Slide3131
Factorization at twist-4
T-4 LO
T-4
N
LO
Finite contribution from asymmetric-cut diagrams
Transverse momentum square weighted
cross section
Slide3232
Evolution equation for T4 -
NEW
s
oft-soft
hard-hard & soft-hard & hard-soft
When , there is no phase space for the gluon radiation from the initial gluon.
Slide33p
T broadening and jet transport
DIS: HERMES
Cold nuclear matter in DIS:
Consistent with value from jet quenching in DIS:
Deng & XNW, PRC83(2010)024902;
Chang, Deng & XNW, PRC89(2014) 034911