Diffractive DIS with E e =70GeV and E p =7TeV at the LHeC For general physics aim and sketch of machine design, see plenary talk of E. Perez … … what could.

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Presentation transcript:

Diffractive DIS with E e =70GeV and E p =7TeV at the LHeC For general physics aim and sketch of machine design, see plenary talk of E. Perez … … what could the increased energy and luminosity bring for diffraction?… some first thoughts … P.Newman, diffractive sessions, HERA-LHC workshop, Wed 7 June 2006

Context ?!? Motivated by discovery / spectroscopy of eq bound states, but also by the low x frontier … naturally building on high density QCD `discoveries’ and developments at HERA Latest of several proposals to increase cms energy in ep physics … but with unprecedented lumi!

Basic Principle On timescale of LHC upgrades Run ep in parallel with high lumi pp operation by adding e beam with energy 70GeV, current 70mA, bunch spacing 25ns … …luminosity cm -2 s -1 New detector required, possibly replacing LHCb at end of their programme

Inclusive Kinematics

Diffractive Kinematics Diffractive Kinematics Factorisation tests / DGLAP applicability / gluon: DPDFs extracted from HERA data predict LHeC cross section at moderate to large  but higher Q2. New dynamics: LHeC opens new low  region – parton saturation, BFKL etc showing up first in diffraction? eA: Enhanced opportunities to study saturation / shadowing… DGLAP

Factorisation tests done at HERA with gluon initiated jet / charm processes… “success!”… BUT kinematically restricted to high  region where F 2 D is least sensitive to the gluon! Final States in Diffraction JETS CHARM

Final States in Diffraction at the LHeC At LHeC, diffractive masses M x up to hundreds of GeV can be produced with low x IP Low , low x IP region for jets and charm accessible… much better DPDF studies New diffractive channels … beauty, W / Z bosons Unfold quantum numbers / precisely measure exclusively produced new / exotic 1 – states Massive extension in x, W range for vector mesons, DVCS … (x IP <0.05) (RAPGAP simulation)

Detector Considerations Considerably more asymmetric than HERA! Accessing x IP = 0.05 with rapidity gap method would require  max cuts in the region 6-8… …forward instrumentation essential! Roman pots, FNC should clearly be an integral part The work going on in this community (Totem, FP420 …) already tells us a lot about what is (not) achievable and may provide recyclable technology. Dedicated studies needed!

Summary LHC is a totally new world of energy and luminosity LHeC is the natural place to go if there is a will to include ep physics and pursue low x physics / diffraction further. This taster was based on a very quick first study (1/2 day!) Surely there is much more to be done to fully evaluate the physics potential! Tentative plan to hold a workshop in October All are invited to think about the possibilities (easy) or contribute (harder!)