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Semi-numerical resummation of event shapes - art. no. 018

JOURNAL OF HIGH ENERGY PHYSICS (2002) ARTN 018

Authors:

A Banfi, GP Salam, G Zanderighi

Small x phenomenology: summary and status

EUROPEAN PHYSICAL JOURNAL C 25:1 (2002) 77-101

Authors:

B Andersson, S Baranov, J Bartels, M Ciafaloni, J Collins, M Davidsson, G Gustafson, H Jung, L Jönsson, M Karlsson, M Kimber, A Kotikov, J Kwiecnski, L Lönnblad, G Miu, G Salam, MH Seymour, T Sjöstrand, N Zotov

The High-energy cosmic ray spectrum from relic particle decay

Nucl.Phys. B621 (2002) 495-520

Authors:

Subir Sarkar, Ramon Toldra

The solution to Olbers' paradox

PHYSICS WORLD 15:10 (2002) 17-17

The topological susceptibility and fπ from lattice QCD

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 523:3-4 (2001) 280-292

Authors:

A Hart, M Teper

Abstract:

We study the topological susceptibility, χ, in QCD with two quark flavours using lattice field configurations that have been produced with an O(a) improved quark action. We find clear evidence for the expected suppression at small quark mass, and examine the variation of χ with this mass. The resulting estimate of the pion decay constant, fπ = 105 ± 6-10+18 MeV, is consistent with the experimental value of ≃ 93 MeV. We compare χ to the large-Nc prediction and find consistency over a large range of quark masses. We discuss the benefits of the non-perturbative action improvement scheme and of the stategy of keeping the lattice spacing (nearly) fixed as the quark mass is varied. We compare our results with other studies and suggest why such a quark mass dependence has not always been seen. © 2001 Elsevier Science B.V. All rights reserved.