Multi-Regge kinematics and azimuthal angle observables for inclusive four-jet production

The study of the inclusive production of a pair of charged light hadrons (a "dihadron" system) featuring high transverse momenta and well separated in rapidity represents a clear channel for the test of the BFKL dynamics at the Large Hadron Collider (LHC). This process has much in common with the well-known Mueller-Navelet jet production; however, hadrons can be detected at much smaller values of the transverse momentum than jets, thus allowing to explore an additional kinematic range, supplementary to the one studied with Mueller-Navelet jets. Furthermore, it makes it possible to constrain not only the parton densities (PDFs) for the initial proton, but also the parton fragmentation functions (FFs) describing the detected hadron in the final state. Here, we present the first full NLA BFKL analysis for cross sections and azimuthal angle correlations for dihadrons produced in the LHC kinematic ranges. We make use of the BrodskyLapage-Mackenzie optimization method to set the values of the renormalization scale and study the effect of choosing different values for the factorization scale. We also gauge the uncertainty coming from the use of different PDF and FF parametrizations.

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“…Its natural extension, the four-jet production process, has been proposed in Ref. [44] and studied in Ref. [45].…”

Section: Introductionmentioning

confidence: 99%

Dihadron production at the LHC: full next-to-leading BFKL calculation

Celiberto

Ivanov

Murdaca³

et al. 2017

Eur. Phys. J. C

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“…We need to remember that the azimuthal decorrelation of the two utmost jets is going to be highly dependant on the exact form of the azimuthal angle average distribution. Therefore, it would be very interesting to study with BFKLex generalised ratios of correlation functions of products of cosines of azimuthal angle differences among the tagged jets like the ones defined in [42,43,44,45].…”

Section: Averages Of Characteristic Quantities In Multi-jet Eventsmentioning

confidence: 99%

The high-energy radiation pattern from BFKLex

Chachamis¹,

Vera²

2016

Proceedings of XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2016)

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We discuss a recent study on high-energy jet production in the multi-Regge limit done with the use of the Monte Carlo event generator BFKLex which includes collinear improvements in the form of double-log contributions. We will show results for the average transverse momentum and azimuthal angle of the final state jets when at least one of them is very forward in rapidity and another one is very backward. We also discuss the introduction of a new observable which accounts for the average rapidity ratio among subsequent emissions.

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“…These processes are inclusive three-jet [36,37] and four-jet production [38,39] with the outermost jets widely separated in rapidity Y , whereas any other tagged jet is to be found in more central regions of the detector. The main idea behind all this effort is that we need more exclusive final states in order to be able to address a number of theoretical issues, e.g.…”

Section: Introductionmentioning

confidence: 99%

Stability of azimuthal-angle observables under higher order corrections in inclusive three-jet production

et al. 2017

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Recently, a new family of observables consisting of azimuthal-angle generalised ratios was proposed in a kinematical setup that resembles the usual Mueller-Navelet jets but with an additional tagged jet in the central region of rapidity. Non-tagged minijet activity between the three jets can affect significantly the azimuthal angle orientation of the jets and is accounted for by the introduction of two BFKL gluon Green functions. Here, we calculate the, presumably, most relevant higher order corrections to the observables by now convoluting the three leading-order jet vertices with two gluon Green functions at next-to-leading logarithmic approximation. The corrections appear to be mostly moderate giving us confidence that the recently proposed observables are actually an excellent way to probe the BFKL dynamics at the LHC. Furthermore, we allow for the jets to take values in different rapidity bins in various configurations such that a comparison between our predictions and the experimental data is a straightforward task. * 'La Caixa'-Severo Ochoa Scholar.

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Multi-Regge kinematics and azimuthal angle observables for inclusive four-jet production

Cited by 67 publications

References 54 publications

Dihadron production at the LHC: full next-to-leading BFKL calculation

Dihadron production at the LHC: full next-to-leading BFKL calculation

The high-energy radiation pattern from BFKLex

Stability of azimuthal-angle observables under higher order corrections in inclusive three-jet production

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