Production of ? and ?′ mesons in ?⁢? and ?⁢Pb collisions

• The production of ? and ?′ mesons is studied in proton-proton and proton-lead collisions collected with the LHCb detector. Proton-proton collisions are studied at center-of-mass energies of 5.02 and 13TeV and proton-lead collisions are studied at a center-of-mass energy per nucleon of 8.16TeV. The studies are performed in center-of-mass (c.m.) rapidity regions 2.5<?c.m.<3.5 (forward rapidity) and −4.0<?c.m.<−3.0 (backward rapidity) defined relative to the proton beam direction. The ? and ?′ production cross sections are measured differentially as a function of transverse momentum for 1.5<?T<10GeV and 3<?T<10GeV, respectively. The differential cross sections are used to calculate nuclear modification factors. The nuclear modification factors for ? and ?′ mesons agree at both forward and backward rapidity, showing no significant evidence of mass dependence. The differential cross sections of ? mesons are also used to calculate ?/?0 cross-section ratios, which show evidence of a deviation from the world average. These studies offer new constraints on mass-dependent nuclear effects in heavy-ion collisions, as well as ? and ?′ meson fragmentation.

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NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

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