Plans ideas for next funding period
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Plans/ideas for next funding period. ALICE upgrades Discussion has started Timeslots for potential upgrades 2013: ½ year shutdown (minor upgrades) 2016/2017: 1 year shutdown (major upgrades, e.g. beam line modifications) Potential projects New pixel layers (close to beam, higher resolution)

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Plans/ideas for next funding period

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Plans ideas for next funding period

Plans/ideas for next funding period

  • ALICE upgrades

    • Discussion has started

    • Timeslots for potential upgrades

      • 2013: ½ year shutdown (minor upgrades)

      • 2016/2017: 1 year shutdown (major upgrades, e.g. beam line modifications)

    • Potential projects

      • New pixel layers (close to beam, higher resolution)

      • Forward calorimeter

  • Compressed Baryonic Matter (CBM) experiment at FAIR/GSI (ESFRI project)

    • First beam: not before 2015


Alice upgrade forward physics at lhc

ALICE upgrade: forward physics at LHC

  • Measurements at small angle/large pseudorapidity

  • Main physics topic

    • p(d)+A

      • low-x region

      • study of ”cold” nuclear matter

      • probing the initial condition


Kinematics

108

106

104

102

100

M2 (GeV2)

10-6 10-4 10-2 100

x

Kinematics

1

RHIC example

  • At 4° (y~3 for pions) and pT=1 GeV/c one can reach values as low of x2 ~ 10-4

  • This is a lower limit, not a typical value: most of the data collected at 4° would have x2~0.01

21 process

y=rapidity of (xL, k) system

2

22 process

Guzev, Strikman, and Vogelsang (hep-ph/0407201)


Initial and final effects dau

r/

ggg

Anti

Shadowing

Shadowing

Initial and final effects – dAu

  • Initial effects

    • Wang, Levai, Kopeliovich, Accardi

  • Especially at forward rapidities:

    • Eskola, Kolhinen, Vogt, Nucl. Phys. A696 (2001) 729-746

    • HIJING

    • D.Kharzeev et al., PLB 561 (2003) 93

  • Others

    • B. Kopeliovich et al., hep-ph/0501260

    • J. Qiu, I, Vitev,hep-ph/0405068

    • R. Hwa et al., nucl-th/0410111

    • D.E. Kahana, S. Kahana, nucl-th/0406074

“Cronin effect”

Initial state elastic multiple scattering

leading to Cronin enhancement (RAA>1)

broaden pT

Nuclear shadowing

depletion of low-x partons

Gluon saturation

depletion of low-x gluons

due to gluon fusion

”Color Glass Condensate (CGC)”

Suppression due to

dominance of projectile valence quarks, energy loss, coherent multiple scattering, energy conservation,

parton recombination, ...


Comparison pqcd vs cgc

Comparison pQCD vs CGC

LO pQCD calculation (nuclear shadowing) vs CGC

Global analysis of nPDFs including BRAHMS data

K.J. Eskola, H. Paukkunena, C.A. Salgadoc,

hep-ph 08020129v1 (2008)

d’Enterria

  • Conclusions (dAu at RHIC)

  • The suppression and in particular the inversion vs. centrality of RdAu at high rapidity may be a signature for the gluon saturation and the small-x evolution.

  • Stronger gluon shadowing -> EPS08

  • Alternate explanations e.g. suppression due to large xF effects work quite well too (suppression effects at SPS!)


Lhc prospects

LHC prospects

  • Predictions

  • pseudorapidity asymmetry for d+Pb -> pi0+X at 8.8 ATeV for |eta| < 0.9 and 2.4 < |eta| < 4.0.

  • Solid line: EPS08 nPDFs, dashed line: HIJING with the

  • inclusion of multiscattering, dot-dashed line: HIJING without multiscattering.

A. Adeluyi et al., arXiv:0808.0682v1


Upgrade idea

Upgrade idea

  • Forward meson spectrometer

    • Goals

      • Study low-x phenomena

      • Jet quenching in less dense matter

      • Pt spectra of identified particles

      • Nuclear modification factor

      • Correlation studies forward-midrapidty

    • Requirements

      • x < 10-5

      • Acceptance

        • y  4...5

        • 0 GeV/c < pt < 30 GeV/c


Upgrade idea1

Upgrade idea

  • Forward meson spectrometer

    • Conceptual design

      • EM-Calorimeter for gamma, pi0, eta, J/Psi at y=5

      • O(10) meters away from IP

      • large dynamic range

      • high occupancy (A+A)

      • two g separation (p0 -> 2g kinematics)

highly segmented (also longitudinally) tracking calorimeter ala CALICE?


Challenge

Challenge

  • Where to put the calorimeter

    • Large distance from IP (50m)

      • ”Standard” calorimeter design

      • Conflict with LHC magnets, new beamline

    • Close to the IP (5-20m)

      • Very high segmentation (ala CALICE)

FoCal


Cbm experiment at fair gsi

CBM experiment at FAIR/GSI

  • Facility for Antiproton and heavy Ions Research

  • Funded, construction will start soon

  • CBM experiment

    • super-dense baryonic matter

    • in-medium properties of hadrons


Plans ideas for next funding period

Debye Screened

Baryons Number

N ~ Nc

Chiral

T

2

Quark Gluon Plasma

Critical Point

Baryon energy density ~ Meson energy density

RHIC

LHC

SPS

Confined

No Baryons

N ~0(1)

Not Chiral

Confined

Baryons

N ~ NcNf

Chiral

FAIR

AGS

Confined Matter

Quarkyonic Matter

Liquid Gas Transition

Color Superconductivity

Conjectured Phase Diagram for Nc = 3


Plans ideas for next funding period

CBM


Plans ideas for next funding period

CBM


Plans ideas for next funding period

CBM

  • Physics interest

    • QCD critical point - fluctuations

    • Chiral symmetry restoration – in-medium modifications of hadrons

  • Possible instrumentation activities

    • Monolithic Active Pixel Sensor readout (3D stacking)

    • Projectile Spectator Detector (forward calorimeter)

    • Online event reconstruction


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