Erratum: Measurement of particle production and inclusive differential cross sections inpp¯collisions ats=1.96  TeV[

Abstract

We report a set of measurements of particle production in inelastic pp collisions collected with a minimum-bias trigger at the Tevatron Collider with the CDF II experiment. The inclusive charged particle transverse momentum differential cross section is measured, with improved precision, over a range about ten times wider than in previous measurements. The former modeling of the spectrum appears to be incompatible with the high particle momenta observed. The dependence of the charged particle transverse momentum on the event particle multiplicity is analyzed to study the various components of hadron interactions. This is one of the observable variables most poorly reproduced by the available Monte Carlo generators. A first measurement of the event transverse energy sum differential cross section is also reported. A comparison with a pythia prediction at the hadron level is performed. The inclusive charged particle differential production cross section is fairly well reproduced only in the transverse momentum range available from previous measurements. At higher momentum the agreement is poor. The transverse energy sum is poorly reproduced over the whole spectrum. The dependence of the charged particle transverse momentum on the particle multiplicity needs the introduction of more sophisticated particle production mechanisms, such as multiple parton interactions, in order to be better explained.

Single inclusive particle production at high energy from HERA data to proton-nucleus collisions

“…The small-x gluons responsible for semihard particle production occupy a small area ∼ σ 0 /2 in the core of the nucleon. This core is surrounded by a nonperturbative edge that becomes larger with √ s, but only participates in soft interactions that contribute to the large total inelastic cross section σ inel (we use σ inel = 42 mb at RHIC [39], σ inel = 44.4 mb at Tevatron [40] and σ inel = 70 mb at LHC energies [41]). This description of the transverse profile in terms of only two numbers, an energy-independent σ 0 and an energydependent σ inel is of course very simplistic, but we believe it captures a physical feature that has been neglected in many works on the subject.…”

Confronting current NLO parton fragmentation functions with inclusive charged-particle spectra at hadron colliders

“…In this section, we compare the data from various experiments with the NLO calculations using the seven FF sets listed in Table 1. Our main attention will be on the latest data from CMS [20,21] and ALICE [22] for p-p collisions at the LHC, as well as the CDF measurements [16] in p-p collisions at Tevatron. We do not include the similar ATLAS measurements [69] here as their results have not been given as invariant cross sections, but only in terms of the absolute yields.…”

“…In all cases, the PDF errors are almost negligibly small in comparison to the scale uncertainty. [20,21], ALICE [22] (diamonds), CDF (squares) [16], and UA1 (triangles) [13] at √ s = 900-7000 GeV, over the corresponding NLO calculations using the Kretzer FFs. The curves show the NLO predictions obtained with other FF sets: kkp (pink scarcely dashed), dss (green dashed), bfgw (brown long-dashed), hkns (purple dashed-dotted), akk08 (yellow dotted-dashed), and akk05 (red long-dashed short-dashed) relative to Kretzer FFs.…”

“…From an experimental perspective, the best precision and widest kinematic reach in the p T -differential cross sections are achieved when no particle identification is performed. The pre-LHC measurements for unidentified charged-hadron spectra in p-p and p-p collisions range from fixed-target experiments at √ s 60 GeV [7,8] to collider experiments covering a wide range of center-of-mass energies √ s = 200 − 1960 GeV [9,10,11,12,13,14,15,16]. However, most of these data are restricted to moderate values of p T 10 GeV/c, and the accuracy for p T ≥ 10 GeV/c is rather poor.…”

“…However, most of these data are restricted to moderate values of p T 10 GeV/c, and the accuracy for p T ≥ 10 GeV/c is rather poor. The importance of the new LHC data to overcome such limitations is underscored by the confusion [17,18,19] triggered by the original CDF data [16] which seemed to display deviations from next-to-leading order (NLO) perturbative QCD (pQCD) calculations up to three orders of magnitude at p T 150 GeV/c, but which was later on identified as an experimental issue (see the erratum of Ref. [16]).…”