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Measurement of dijet production at low Q**2 at HERA.

The H1 collaboration Aktas, A. ; Andreev, V. ; Anthonis, T. ; et al.
Eur.Phys.J.C 37 (2004) 141-159, 2004.
Inspire Record 642523 DOI 10.17182/hepdata.46280

Triple differential dijet cross sections in e^\pm p interactions are presented in the region of photon virtualities 2<Q^2<80GeV^2, inelasticities 0.1<y<0.85, jet transverse energies E_T1>7GeV, E_T2>5GeV, and pseudorapidities -2.5 < eta_1^*, eta_2^* <0. The measurements are made in the gamma^* p centre-of-mass frame, using an integrated luminosity of 57pb^-1. The data are compared with NLO QCD calculations and LO Monte Carlo programs with and without a resolved virtual photon contribution. NLO QCD calculations fail to describe the region of low Q^2 and low jet transverse energies, in contrast to a LO Monte Carlo generator which includes direct and resolved photon interactions with both transversely and longitudinally polarised photons. Initial and final state parton showers are tested as a mechanism for including higher order QCD effects in low E_T jet production.

16 data tables
Table 1

Triple differential dijet cross sections as a function of Q**2, ET and X(C=GAMMA).

Table 2

Triple differential dijet cross sections as a function of Q**2, ET and X(C=GAMMA).

Table 3

Triple differential dijet cross sections as a function of Q**2, ET and X(C=GAMMA).

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Investigation of power corrections to event shape variables measured in deep-inelastic scattering.

The H1 collaboration Adloff, C. ; Andreev, V. ; Andrieu, B. ; et al.
Eur.Phys.J.C 14 (2000) 255-269, 2000.
Inspire Record 512347 DOI 10.17182/hepdata.43865

Deep-inelastic ep scattering data, taken with the H1 detector at HERA, are used to study the event shape variables thrust, jet broadening, jet mass, C parameter and two kinds of differential two-jet rate. The data cover a large range of the four-momentum transfer Q, which is considered to be the relevant energy scale, between 7 GeV and 100 GeV. The Q dependences of the mean values are compared with second order calculations of perturbative QCD applying power law corrections proportional to 1/Q^p to account for hadronization effects. The concept of power corrections is investigated by fitting simultaneously a non-perturbative parameter alpha_p and the strong coupling constant alpha_s.

63 data tables
Table 1

Corrected mean values of the (1-THRUST) distribution (w.r.t.current hemisphere axis) as a function of Q.

Table 2

Corrected mean values of the Jet Broadenning (B) distribution (w.r.t.current hemisphere axis) as a function of Q.

Table 3

Corrected mean values of the (1-THRUST) distribution (w.r.t.max long. momentum axis) as a function of Q.

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