Dijet rates with symmetric E t cuts.

We consider dijet production in the region where symmetric cuts on the transverse energy, Et, are applied to the jets. In this region next-to?leading order calculations are unreliable and an all-order resummation of soft gluon effects is needed, which we carry out. Although, for illustrative purposes, we choose dijets produced in deep inelastic scattering, our general ideas apply additionally to dijets produced in photoproduction or ?? processes and should be relevant also to the study of prompt di-photon Et spectra in association with a recoiling jet, in hadron-hadron processes.

[1]  Z. Trocsanyi,et al.  QCD radiative corrections to prompt diphoton production in association with a jet at hadron colliders , 2003, hep-ph/0303012.

[2]  D. Florian,et al.  The qT spectrum of the Higgs boson at the LHC in QCD perturbation theory , 2003, hep-ph/0302104.

[3]  R. Appleby,et al.  Non-global logarithms in inter-jet energy flow with kt clustering requirement , 2002, hep-ph/0211426.

[4]  A. Banfi,et al.  Away-from-jet energy flow , 2002, hep-ph/0206076.

[5]  A. Banfi,et al.  Azimuthal correlation in DIS , 2002, hep-ph/0207072.

[6]  S. Chekanov.  Dijet production in neutral current deep inelastic scattering at HERA , 2002 .

[7]  G. Salam,et al.  Accounting for coherence in interjet Et flow , 2002, hep-ph/0203009.

[8]  Alan D. Martin,et al.  MRST2001: partons and $\alpha_S$ from precise deep inelastic scattering and Tevatron jet data , 2001, hep-ph/0110215.

[9]  The Zeus Collaboration,et al.  Dijet production in neutral current deep inelastic scattering at HERA , 2001, hep-ex/0109029.

[10]  G. Zanderighi,et al.  Out-of-plane QCD radiation in DIS with high p_t jets , 2001, hep-ph/0111157.

[11]  G. Salam,et al.  Resummation of the jet broadening in DIS , 2001, hep-ph/0110213.

[12]  E. Koffeman,et al.  Measurement of dijet production in neutral current deep inelastic scattering at high Q**2 and determination of alpha(s) , 2001 .

[13]  Z. Trocsanyi,et al.  Multijet cross sections in deep inelastic scattering at next-to-leading order. , 2001, Physical review letters.

[14]  G. Salam,et al.  Resummation of non-global QCD observables , 2001, hep-ph/0104277.

[15]  Zeus Collaboration.  Measurement of dijet production in neutral current deep inelastic scattering at high Q**2 and determination of alpha_s , 2001, hep-ex/0102042.

[16]  E. al.,et al.  Dijet production in charged and neutral current $e^+p$ interactions at high $Q^2$ , 2000, hep-ex/0010016.

[17]  R. G. Roberts,et al.  MRST 2001 : partons and α S from precise deep inelastic scattering and Tevatron jet data , 2001 .

[18]  G. Salam,et al.  Resummation of the jet broadening in DIS 1 , 2001 .

[19]  B. Pötter.  JetViP 2.1: the hbook version , 2000 .

[20]  A. Guffanti,et al.  Non-perturbative effects in the W and Z transverse momentum distribution , 2000, hep-ph/0007190.

[21]  G. Zanderighi,et al.  QCD analysis of near-to-planar 3-jet events , 2000, hep-ph/0004027.

[22]  G. Salam,et al.  Resummation of thrust distributions in DIS , 1999, hep-ph/9912488.

[23]  M. Grazzini,et al.  Infrared factorization of tree-level QCD amplitudes at the next-to-next-to-leading order and beyond ☆ , 1999, hep-ph/9908523.

[24]  B. Potter.  JetViP 2.1: the hbook version , 1999, hep-ph/9911221.

[25]  B. Flaugher,et al.  INCLUSIVE JET AND DIJET PRODUCTION AT THE TEVATRON , 1999, hep-ex/9903058.

[26]  N. Kidonakis,et al.  Threshold resummation for dijet cross-sections , 1998, hep-ph/9801268.

[27]  D. Graudenz.  DISASTER++ (Version 1.0) , 1997, hep-ph/9710244.

[28]  G. Ridolfi,et al.  Jet photoproduction at HERA , 1997, hep-ph/9707345.

[29]  H1 Collaboration , 1997 .

[30]  G. Kramer,et al.  Inclusive two-jet production at HERA: direct and resolved cross sections in next-to-leading order QCD , 1996, hep-ph/9611450.

[31]  M. Seymour,et al.  A general algorithm for calculating jet cross sections in NLO QCD , 1996, hep-ph/9605323.

[32]  G. Kramer,et al.  Large transverse momentum jet production and DIS distributions of the proton , 1996, hep-ph/9605210.

[33]  G. Kramer,et al.  Dijet cross sections in photon-proton collisions , 1996 .

[34]  M. Beneke,et al.  Power corrections and renormalons in Drell-Yan production , 1995, hep-ph/9506452.

[35]  M. Seymour,et al.  Longitudinally-invariant k ⊥ -clustering algorithms for hadron-hadron collisions , 1993 .

[36]  Ellis,et al.  Successive combination jet algorithm for hadron collisions. , 1993, Physical review. D, Particles and fields.

[37]  G. Marchesini,et al.  Measuring colour flows in hard processes: beyond leading order , 1992 .

[38]  B. Webber,et al.  QCD coherent branching and semi-inclusive processes at large χ , 1991 .

[39]  B. Webber,et al.  Transverse Momentum Moments of Hadron Distributions in {QCD} Jets , 1981 .

[40]  G. Parisi,et al.  Small Transverse Momentum Distributions in Hard Processes , 1979 .