Soft-gluon resummation for high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>p</mml:mi><mml:mi>T</mml:mi></mml:msub></mml:math>inclusive-hadron production at COMPASS

Pfeuffer, Melanie

doi:10.1103/physrevd.88.014024

Cited by 20 publications

(45 citation statements)

References 36 publications

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“…A LL is the ratio of the spin-dependent cross section and the spin-averaged one. Since the latter has already been addressed in [8], we will in this paper examine threshold resummation for polarized scattering. As a first step, we will consider the direct contributions to the cross section, which are simpler to analyze and also formally dominate over the resolved ones near partonic threshold.…”

Section: Introductionmentioning

confidence: 99%

“…As discussed in [8], in the kinematic regime accessible at COMPASS perturbative corrections beyond NLO are important. This is because typical transverse momenta p T of the produced hadron are such that the variable x T = 2p T / √ S (with √ S the muon-proton center-of-mass energy) is relatively large, x T 0.2.…”

Section: Introductionmentioning

confidence: 99%

“…It was applied to the spin-averaged cross section at COM-PASS at next-to-leading logarithm (NLL) level in Ref. [8], where the resummation of both the direct and the resolved contribution was performed. The resummed result for the cross section was found to be significantly higher than the NLO one, by roughly a factor two.…”

Section: Introductionmentioning

confidence: 99%

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Threshold resummation for polarized high-pThadron production at COMPASS

2015

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We study the cross section for the photoproduction process γN → hX where the incident photon and nucleon are longitudinally polarized and a hadron h is observed at high transverse momentum. Specifically, we address the "direct" part of the cross section, for which the photon interacts in a pointlike way. For this contribution we perform an all-order resummation of logarithmic threshold corrections generated by soft or collinear gluon emission to next-to-leading logarithmic accuracy. We present phenomenological results relevant for the COMPASS experiment and compare to recent COMPASS data.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Threshold resummation for polarized high-pThadron production at COMPASS

2015

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“…For example, the cross section for single-inclusive hadron production H 1 H 2 → hX is of great phenomenological relevance. The structure of the resummed partonic cross section is in fact similar to the case of di-hadron production [32,33,34]. With the techniques established in this work, one may also extend the accuracy of resummation for this process toward NNLL.…”

Section: Discussionmentioning

confidence: 72%

Toward NNLL Resummation for Single- and Di-Hadron Production in Hadronic Collisions

Ringer¹,

Vogelsang²,

Sterman³

et al. 2016

Proceedings of QCD Evolution 2015 — PoS(QCDEV2015)

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We present results relevant for the extension of threshold resummation beyond the next-to-leading logarithmic (NLL) order for QCD hard-scattering processes. As an example, we consider dihadron production H 1 H 2 → h 1 h 2 X, where the produced pair has a large invariant mass. Taking into account the non-trivial color structure of the partonic hard-scattering process, we determine the hard and soft matrices in color space. In our numerical studies we find a significant improvement compared to previous results at NLL accuracy. In particular, the scale dependence of the resummed cross section is greatly reduced. In addition, we comment on the extension of the techniques developed in this work to other observables relevant for hadronic collisions.

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“…The gluon polarisation is probed by several subprocesses contributing to these measurements, like the PGF but also by subprocesses arising from the resolved photon contribution. Although theoretical calculation are available at NLO, it has been shown in [13,14] on unpolarised data that for the low centre of mass energy available in COMPASS kinematics a resummation of soft gluons is mandatory to describe the data. The extension of the calculation for the polarised case is ongoing and do not permit a global QCD fit of the data yet.…”

Section: Measurements In the Photoproduction Regime Via A Ll (P T )mentioning

confidence: 99%

Recent COMPASS results on the nucleon longitudinal spin structure and QCD fits

Andrieux

2014

EPJ Web of Conferences

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Abstract. The latest measurements of the proton longitudinal spin structure function, g p 1 , in the deep inelastic (DIS) regime are presented. They improve the statistical accuracy of the existing data and extend the kinematic domain to a lower value of x and higher values of Q 2 . A global NLO QCD fit of all g 1 world data on the proton, deuteron and neutron has been achieved. The results give a quantification of the quark spin contribution to the nucleon spin, 0.26 < ΔΣ < 0.34 at 3 (GeV/c) 2 in MS scheme. The errors are dominated by the uncertainty on the shape of the functional forms assumed in the fit. A new verification of the fundamental Bjorken sum rule is obtained at a 9% level, using only COMPASS g 1 proton and deuteron measurements. Preliminary results of a reevaluation of the gluon polarization Δg/g are presented. The analysis is based on double spin asymmetry of high-p T hadron production cross-sections in the DIS regime. A positive value of Δg/g = 0.113 ± 0.038 ± 0.035 is obtained at leading order at x ∼ 0.1. In parallel, the double spin asymmetry in the photoproduction regime is also studied. Finally, preliminary results on quark fragmentation functions into pions extracted from a LO fit of pion multiplicities in semi-inclusive DIS are presented.

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Soft-gluon resummation for high-pTinclusive-hadron production at COMPASS

Cited by 20 publications

References 36 publications

Threshold resummation for polarized high-pThadron production at COMPASS

Threshold resummation for polarized high-pThadron production at COMPASS

Toward NNLL Resummation for Single- and Di-Hadron Production in Hadronic Collisions

Recent COMPASS results on the nucleon longitudinal spin structure and QCD fits

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