Florian Schwennsen

Mueller Navelet jets at LHC — complete next-to-leading BFKL calculation

We calculate cross section and azimuthal decorrellation of Mueller Navelet jets at the LHC in the complete next-lo-leading order BFKL framework, i.e. including next-to-leading corrections to the Green’s function as well as next-to-leading corrections to the Mueller Navelet vertices. The obtained results for standard observables proposed for studies of Mueller Navelet jets show that both sources of corrections are of equal, big importance for final magnitude and final behavior of observables. The astonishing conclusion of our analysis is that the observables obtained within the complete next-lo-leading order BFKL framework of the present paper are quite similar to the same observables obtained within next-to-leading DGLAP type treatment. This fact sheds doubts on general belief that the studies of Mueller Navelet jets at the LHC will lead to clear discrimination between the BFKL and the DGLAP dynamics.

The Azimuthal decorrelation of jets widely separated in rapidity as a test of the BFKL kernel

We study the decorrelation in azimuthal angle of Mueller–Navelet jets at hadron colliders within the BFKL formalism. We introduce NLO terms in the evolution kernel and present a collinearly–improved version of it for all conformal spins. We show how this further resummation has good convergence properties and is closer to the Tevatron data than a simple LO treatment. However, we are still far from a good fit. We offer estimates of these decorrelations for larger rapidity differences which should favor the onset of BFKL effects and encourage experimental studies of this observable at the LHC.

Mueller Navelet jets at LHC - complete NLL BFKL calculation

For the first time, a next-to-leading BFKL study of the cross s ection and azimuthal decorrellation of Mueller Navelet jets is performed, i.e. including next-t o-leading corrections to the Green’s function as well as next-to-leading corrections to the Mueller Navelet vertices. The obtained results for standard observables proposed for studies of Mueller Navelet jets show that both sources of corrections are of equal and big importance for final magni tude and final behavior of observables, in particular for the LHC kinematics investigated here in detail. The astonishing conclusion of our analysis is that the observables obtained within the c omplete next-lo-leading order BFKL framework of the present paper are quite similar to the same observables obtained within nextto-leading logarithm DGLAP type treatment. This fact sheds doubts on general belief that the studies of Mueller Navelet jets at the LHC will lead to clear discrimination between the BFKL and the DGLAP dynamics.

Azimuthal decorrelation of forward jets in deep inelastic scattering

We study the azimuthal angle decorrelation of forward jets in deep inelastic scattering. We make predictions for this observable at HERA describing the high energy limit of the relevant scattering amplitudes with quasi-multi-Regge kinematics together with a collinearly-improved evolution kernel for multiparton emissions.

NLO inclusive jet production in kT-factorization

The inclusive production of jets in the central region of rapidity is studied in kT–factorization at next–to–leading order (NLO) in QCD perturbation theory. Calculations are performed in the Regge limit making use of the NLO BFKL results. A jet cone definition is introduced and a proper phase–space separation into multi–Regge and quasi–multi–Regge kinematic regions is carried out. Two situations are discussed: scattering of highly virtual photons, which requires a symmetric energy scale to separate the impact factors from the gluon Greens function, and hadron–hadron collisions, where a non–symmetric scale choice is needed.

Hard Pomeron-Odderon interference effects in the production of

We estimate the production of two meson pairs in high energy photon photon collisions produced in ultraperipheral collisions at LHC. We show that the study of charge asymmetries may reveal the existence of the perturbative Odderon and discuss the concrete event rates expected at the LHC. Sizable rates and asymmetries are expected in the case of proton-proton collisions and medium values of gamma-gamma energies \sqrt{s_{\gamma \gamma}} \approx 20GeV. Proton-proton collisions will benefit from a high rate due to a large effective gamma-gamma luminosity and ion-ion collisions with a somewhat lower rate from the possibility to trigger on ultraperipheral collisions and a reduced background from strong interactions.

\pi^{+} \pi^{-}

We report on the first next-to-leading BFKL study of the cross section and azimuthal decorrellation of Mueller Navelet jets. This includes next-to-lead ing corrections to the Green’s function as well as next-to-leading corrections to the Mueller Navel et vertices. The obtained results for standard observables proposed for studies of Mueller Navelet jets show that both sources of corrections are of equal and big importance for final magnitude a nd final behavior of observables, in particular for the LHC kinematics investigated here in de tail. The astonishing conclusion of our analysis is that the observables obtained within the com plete next-lo-leading order BFKL framework of the present contribution are quite similar to t he same observables obtained within next-to-leading logarithm DGLAP type treatment. The only noticeable difference is the ratio the azimuthal angular moments hcos 2ϕi/hcos ϕi which still differs in both treatments.

pairs in high energy gamma-gamma collisions at the LHC

For the first time, a next-to-leading BFKL study of the cross s ection and azimuthal decorrellation of Mueller Navelet jets is performed, i.e. including next-t o-leading corrections to the Green’s function as well as next-to-leading corrections to the Mueller Navelet vertices. The obtained results for standard observables proposed for studies of Mueller Navelet jets show that both sources of corrections are of equal and big importance for final magni tude and final behavior of observables, in particular for the LHC kinematics investigated here in detail. The astonishing conclusion of our analysis is that the observables obtained within the c omplete next-lo-leading order BFKL framework of the present paper are quite similar to the same observables obtained within nextto-leading logarithm DGLAP type treatment. This fact sheds doubts on general belief that the studies of Mueller Navelet jets at the LHC will lead to clear discrimination between the BFKL and the DGLAP dynamics.

The First complete NLL BFKL study of Mueller Navelet jets at LHC

We discuss the azimuthal angle decorrelation of Mueller-Navelet jets at hadron colliders and forward jets in Deep Inelastic Scattering within the BFKL framework with a NLO kernel. We stress the need of collinear improvements to obtain good perturbative convergence. We provide estimates of these decorrelations for large rapidity differences at the Tevatron, LHC and HERA.

A Complete NLL BFKL calculation of Mueller Navelet jets at LHC

The inclusive production of jets in the central region of rapidity is studied in kT-factorization at next-to-leading order (NLO) in QCD perturbation theory. Calcu- lations are performed in the Regge limit making use of the NLO BFKL results. A jet cone definition is introduced and a proper phase-space separation into multi-Regge and quasi-multi-Regge kinematic regions is carried out. Two situations are discussed: scat- tering of highly virtual photons, which requires a symmetric energy scale to separate the impact factors from the gluon Greens function, and hadron-hadron collisions, where a non-symmetric scale choice is needed.In this contribution we discuss the inclusive production of jets in central regions of rapidity in the context of kT ‐factorization at next‐to‐leading order (NLO). We work in the Regge limit of QCD and use the NLO BFKL results. A jet cone definition is propo sed together with a phase‐ space separation into multi‐Regge and quasi‐multi‐Regge kinematics. We discuss scattering of highly virtual photons, with a symmetric energy scale to separate the impact factors from the gluon Green’s function, and hadron‐hadron collisions, wit h a non‐symmetric scale choice.