NuPECC LRP2010 Town Meeting Madrid, May 31st (LHeC)

Transcription

1 NuPECC LRP0 Town Meeting Madrid, May 31st 0 The Large Hadronelectron Collider (LHeC) Néstor Armesto Departamento de Física de Partículas and IGFAE Universidade de Santiago de Compostela nestor.armesto@usc.es for the LHeC Study Group 1

2 Project: ep/ea experiment using p/a from the LHC: Ep=7 TeV, EA=(Z/A)Ep=.75 TeV/nucleon for Pb. New e + /e - accelerator: Ecm 1- TeV/nucleon (Ee=5050 GeV). Requirements: * Luminosity 33 cm - s. ) (GeV Q 6 nuclear DIS - F ),A (x,q 5 Proposed facilities: LHeC Fixed-target data: * Acceptance: 179 degrees (low-x ep/ea). * Tracking to 1 mrad. * EMCAL calibration to 0.l %. * HCAL calibration to 0.5 %. * Luminosity determination to 1 %. * Compatible with LHC operation Q s perturbative -6 NMC E77 E139 E665 EMC (Pb, b=0 fm) non-perturbative e-pb (LHeC) (70 GeV -.5 TeV) - x The Large Hadron-electron Collider.

3 Physics goals: =%,"'!(071)'4-)$%>-$'!"#$%&$'()*'+(),-'.-/'!"#$%&$'.9&6-(0'' :709&790-'' ;'4#)(<%&$'!0-&%$%1)'34'()*' Proton structure to a few -0 m: Q lever arm. Precision QCD/EW physics. High-mass frontier (leptoquarks, excited fermions, contact interactions). Unambiguous access, in ep and ea, to a qualitatively novel regime of matter predicted by QCD. Substructure/parton dynamics inside nuclei with strong implications on QGP search. The Large Hadron-electron Collider. 3

4 The machine: Ring-Ring option e-injector BYPASS The Large Hadron-electron Collider. 4

5 The machine: Linac-Ring option pulsed, racetrack highest energy racetrack CW energy recovery For ions, RR/LR: Luminosity per nucleon 1-3 cm - s, ep for 179 o acceptance (low-x setup). The Large Hadron-electron Collider. 5

6 Detector: low-x/ea setup Detector - Low Q - No Dipole (Draft) [cm] 40 HaC-Barrel Fwd Tracking HaC-Barrel-bwd EmC-Endcap-bwd Bwd Tracking EmC-insert-!-bwd 177 EmC-Barrel EmC-Barrel-bwd and HaC-insert-! -fwd Central Tracking 5 and and and 177 and and 179 HaC-insert-! -bwd EmC-insert/ 40 e EmC-Endcap p Solenoid 89 The Large!"#$%&'()"*+,+'(-&**,. Hadron-electron Collider. /",01,1(311$+,4'(56$7(3&.(5686 6

7 Small-x physics: xp(x) c ) H1PDF 009 Q = GeV xg /0 xs /0 xu v xd v?< E)x <;<GHe9789I67iJe 9eKi;< &()*+,-#( &'(#!0340 " i;< 5>6?e Q 5 BxD!+#./0 "+3 Novel regime of matter beyond the unitarity limit at small x and/or high A: saturation of partonic densities Two-pronged approach: x / A. Prediction: semiclassical QCD at weak coupling (CGC). x?<! QF! DILUTE REGION!"#$% DENSE REGION The Large Hadron-electron Collider. ln A 7 ln 1/x ep ea!"#xe& ()?< Q

8 Nuclear parton densities (I): Large uncertainties in parton densities at low x in nuclei (no existing data). LHeC data will substantially improve it. Impact on the characterization of the hot medium in UrHIC through hard probes (cold nuclear effects). The Large Hadron-electron Collider. 8

9 Nuclear parton densities (II): 1. R Pb F (x,5 GeV ) EPS09 nds HKN07 FGS AKST Data: LHeC x ep/ed collisions at the LHeC would substantially improve our knowledge on the neutron pdf s. LHeC will test the relation between diffraction in ep and nuclear shadowing. The Large Hadron-electron Collider. 9

10 Initial conditions for UrHIC: Azimuthal anisotropy in UrHIC (RHIC) points to low viscosity/strong coupling of the produced medium. Initial conditions crucial for the collective behavior. M.Tannenbaum, Rept.Prog.Phys 65 (006) 005 Hirano et al, Phys.Lett.B636(006)99 ea offers a clean environment to check the ideas about particle production giving the initial condition, and thermalization. The Large Hadron-electron Collider.

11 Final state exploration: LHeC (νmax 5 GeV) will study the dynamics of hadronization (partonic/hadronic eloss) by introducing a length of colored material to modify its pattern (length/nuclear size, chemical composition). Low energy: need of hadronization inside formation time, (pre-) hadronic absorption,... High energy: partonic evolution altered in the nuclear medium, partonic energy loss. The Large Hadron-electron Collider. 11

12 Summary: LHeC: new facility at CERN for ep/ea collisions at Ecm 1- TeV under design. For nuclei, it will explore a new realm in their partonic structure. ) (GeV Q 6 nuclear DIS - F ),A (x,q Proposed facilities: LHeC Fixed-target data: Q s NMC E77 E139 E665 EMC (Pb, b=0 fm) e-pb (LHeC) (70 GeV -.5 TeV) LHeC physics has strong implications on UrHIC (thus complementary to pa@lhc). 1 perturbative non-perturbative x LHeC could be built in years, depending on the LHC schedules and on us. The Large Hadron-electron Collider. 1

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he Large Hadron-electron Collider. Plans for the CDR: XV! YV! ]V! ^V! `V! bv! The LHeC Study Group B8&<J!84!+4!$*!YZXZ! T$*7#$J&!<5LJ$CJ!7*=!8&C5*$C7#!J8)=$&J! 69BXZ!T$'&*?&![H<'$#\!7*=!9FH--!37<7*![G7L\!! 6'7P8!-6/!B&<8&NO&'!YZXZ! 6$%4**&!Y_VXZVU]ZVXZV!T$*7#!K4'DJ54<! 04%&NO&'!YZXZa!T$*7#!'&<4'8!84!.-TH! B)ON$8!-6/!84!-./0!.-TH!0)F.--! Many thanks to Max Klein, Brian Cole, Paul Newman, Anna Stasto, Urs Wiedemann, Peter Kotska, David d Enterria, Kari Eskola, Hannu Paukkunen, Carlos Salgado, Mark Strikman, Konrad Tywoniuk and all other collaborators in the preparation of the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

14 Backup: kinematics Salgado ep: access to the perturbative region below x a few -5. ea: new realm. pa@lhc will cover larger x, Q. x The Large Hadron-electron Collider. A x A 14 ) (GeV ; Q m T ; E ALICE expected reach in 1 yr. pa(ap) collisions 6 Jets T pa Q sat Photons Hadrons! <0.9! s from B s -4<! <-.5 D s! <0.9 (x) Ap Present DIS+DY data 1 ) (GeV Q CMS expected reach in 1 yr. pa(ap) collisions Q sat Jets! <5 Photons! <3 Hadrons! <.5 (x) Present DIS+DY data 1

15 Backup: ea collisions Ions are part of the LHC program: Pb, maybe Ar, Ca, O,... RR/LR: Luminosity per nucleon 1-3 cm - s. Roughly the same luminosity per nucleon than in ep for a 179 degree acceptance (low-x/ea setup). Q 4 (GeV ) 08 Pb(750)+e(50) 3 Q sat,gbw ( 08 Pb) 1 - o o! e =170,179 Existing data (approximate) x - The Large Hadron-electron Collider. 15