Prompt K0S production in pp collisions at √s = 0.9 TeV

The preprint is available here.

Phys. Lett. B 693 (2010) 69-80


More detailed information:ANA note 2010-002


The production of K_short mesons in pp collisions at a centre-of-mass energy of 0.9 TeV is studied with the LHCb detector at the Large Hadron Collider. The luminosity of the analysed sample is determined using a novel technique, involving measurements of the beam currents, sizes and positions, and is found to be 6.8 +/- 1.0 microbarn^-1. The differential prompt K_short production cross-section is measured as a function of the K_short transverse momentum and rapidity in the region 0 < pT < 1.6 GeV/c and 2.5 < y < 4.0. The data are found to be in reasonable agreement with previous measurements and generator expectations.


Note that equation numbers and references in the captions refer to those given in the paper.

Caption Figure
Distributions in the horizontal (top) and vertical (bottom) planes of the reconstructed vertices in b1 (blue filled circles and solid fit line) and b2 (red open circles and dashed fit line) crossings in one fill. Fig1.png
Measured profiles of beam-1, beam-2 and luminous region (from left to right) in the horizontal direction x, in bb crossings of one pair of colliding bunches in one fill. The solid curve is a fit to the observed distributions, the dotted curve represents the vertex resolution, and the dashed curve shows the underlying distributions after deconvolution of the vertex resolution. Fig2.png
Mass distributions of all selected KS0 candidates, in the downstream-track (left) and long-track (right) selections. The points are the beam–gas subtracted data and the curves are the result of the fits described in the text. Fig3.png
Left: Downstream track multiplicity for events containing a signal KS0, in data (black filled circles) and MC (red open squares), normalized to unit area. Right: Trigger efficiency for events containing a signal KS0 decay in the downstream-track selection, as a function of the KS0 pT, estimated both in data (black filled circles) and MC (red open squares), using Eq. (9). Fig4.png
Double-differential prompt KS0 production cross-section in pp collisions at sqrt(s)=0.9 TeV as a function of transverse momentum pT and rapidity y. The points represent LHCb data, with total uncertainties shown as vertical error bars and statistical uncertainties as tick marks on the bars. The histograms are predictions from different settings of the PYTHIA generator (see text). The lower plots show the MC/data ratios, with the shaded band representing the uncertainty for one of these ratios, dominated by the uncertainty on the measurements (the relative uncertainties for the other ratios are similar). Fig5.png
Absolute measurements of the prompt View the MathML source production cross-section as a function of transverse momentum pT, performed by the UA1 [5], UA5 [2], CDF [4] and LHCb experiments, at different high-energy hadron colliders and in different rapidity (y) or pseudo-rapidity (η) ranges. Fig6.png

-- TaraShears - 18-Sep-2012

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