Abstract
Open and hidden charm production in nucleus-nucleus collisions is considered as a key probe of Quark Gluon Plasma (QGP) formation. In the search of specific QGP effects, proton-nucleus collisions are used as the reference as they account for the corresponding Cold Nuclear Matter (CNM) effects. The LHCb experiment, thanks to its System for Measuring Overlap with Gas (SMOG) can be operated in a fixed target mode with the LHC beams, at an intermediate center-of-mass energy between nominal SPS and RHIC energies. In 2015, for the first time, reactions of incident LHC proton beams on noble gas targets have been recorded by the LHCb experiment at a center-of-mass energy of 110 GeV and within the center-of-mass rapidity range −2.77<y⁎<−0.2. The first high resolution measurements on open and hidden charm production obtained under these conditions are presented.
Highlights
LHCb designed for b, c physics; general purpose detector in the forward direction
SMOG: System for Measuring Overlap with Gas Injecting noble gas (He, Ne, Ar, ...) in the Vertex Detector Primary role: beam-gas imaging for luminosity measurement
Fixed-target mode Parasitic to the collider mode Gas spreads in the beam pipe up to ±20m around LHCb Use non-colliding bunches
Summary
New high resolution measurements of open and hidden charm √production in proton-nucleus collisions at s = 110 GeV with LHCb. Emilie Maurice on behalf of the LHCb collaboration XXVI international conference on ultrarelativistic heavy-ion collisions, Quark Matter, 7th February 2017. √ Open and hidden charm production in pAr at s = 110 GeV, with LHCb, E. LHCb designed for b, c physics; general purpose detector in the forward direction. Unique oppportunity to perform fixed-target mode program at LHC: Forward measurement of open and hidden charm production (J/ψ, D0...) Measurement down to low pT Large rapidity coverage (∼ 3 rapidity units) at large Bjorken-x
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