Small-x phenomenology – Summary of the 3rd Lund small-x workshop in 2004

Andersen, Jeppe R.; Baranov, S. P.; Bartels, Jochen; Barnaföldi, G. G.; Chachamis, Grigorios; Collins, John C.; Grindhammer, G.; Gustafson, Gösta; Hansson, Magnus; Ingelman, G.; Jung, H.; Jönsson, L.; Knutsson, A.; Kowalski, H.; Kutak, Krzysztof; Kyrieleis, Albrecht; Lévai, P.; Lipatov, A. V.; Lönnblad, Leif; Lublinsky, Michael; Marchesini, G.; Milcewicz, I.; Risler, C.; Vera, A. Sabio; Sjödahl, Malin; Staśto, Anna; Turnau, J.; Watt, G.; Zotov, N. P.

doi:10.1140/epjc/s2006-02615-6

Cited by 90 publications

(43 citation statements)

References 279 publications

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“…[37]), to achieve a full treatment of gluon coherence effects [38] capable of describing jet final states across the whole rapidity phase space. A uniform treatment of the high-energy and Sudakov regions is still an open issue [39] of interest for parton-shower implementations.…”

Section: Jhep09(2009)121mentioning

confidence: 99%

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Forward jet production at the Large Hadron Collider

Deák

Hautmann

Jung

et al. 2009

J. High Energy Phys.

154

196

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At the Large Hadron Collider (LHC) it will become possible for the first time to investigate experimentally the forward region in hadron-hadron collisions via high-p T processes. In the LHC forward kinematics QCD logarithmic corrections in the hard transverse momentum and in the large rapidity interval may both be quantitatively significant. We analyze the hadroproduction of forward jets in the framework of QCD high-energy factorization, which allows one to resum consistently both kinds of corrections to higher orders in QCD perturbation theory. We compute the short-distance matrix elements needed to evaluate the factorization formula at fully exclusive level. We discuss numerically dynamical features of multi-gluon emission at large angle encoded in the factorizing high-energy amplitudes.

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Section: Jhep09(2009)121mentioning

confidence: 99%

“…Observe that calculations based on the unintegrated formalism will in general depend on two scales, µ and the rapidity, or angle, cut-off [26,39,41]. See e.g.…”

Section: Jhep09(2009)121mentioning

confidence: 99%

Forward jet production at the Large Hadron Collider

Deák

Hautmann

Jung

et al. 2009

J. High Energy Phys.

154

196

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“…x 1,2 are the longitudinal momentum fractions of the partons that are adjacent to the jets. Various works [12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] addressing the azimuthal 2 angle (θ) profile of the two tagged jets, suggest the presence of important minijet activity populating the rapidity interval which can be taken into account by considering a BFKL gluon Green function connecting the two jets. However, it was shown that the azimuthal angle behaviour of the tagged jets is strongly contaminated by collinear effects [27,28], that have their origin at the n = 0 Fourier component in θ of the BFKL kernel.…”

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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“…A detailed description of this formalism can be found, for example, in the reviews in Refs. [21][22][23]. …”

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confidence: 99%

“…A detailed description of this formalism can be found, for example, in the reviews in Refs. [21][22][23]. We only mention that the main part of the higher-order QCD corrections (namely, NLO + NNLO + N 3 LO + · · · contributions, which correspond to the log 1/x enhanced terms in perturbative series) is effectively taken into account in the k T -factorization approach already at leading order, and it provides a solid theoretical ground for the effects of the initial parton radiation and transverse momenta of the initial quarks and gluons.…”

mentioning

confidence: 99%

On the possibility to detect the Higgs decay $$H\rightarrow b\bar{b}$$ H → b b ¯ in the associated $$Z+ b\bar{b}$$ Z + b b ¯ production at the LHC

Lipatov

Zotov

2015

Eur. Phys. J. C

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We investigate the possibility to detect the scalar Higgs boson decay H → bb in the associated Z and bb production at the LHC using the k T -factorization QCD approach. Our consideration is based on the off-shell (i.e. depending on the transverse momenta of initial quarks and gluons) production amplitudes of q * q * → Z H → Zq q , q * q * → Zq q , and g * g * → Zq q partonic subprocesses supplemented with the Catani-Ciafoloni-FioraniMarchesini (CCFM) dynamics of parton densities in a proton. We argue that the H → bb signal could be observed at large transverse momenta near the Higgs boson peak despite the overwhelming QCD background, and we point out the important role of angular correlations between the produced Z boson and b-quarks.In 2012, during the search performed by the CMS and ATLAS Collaborations at the LHC, the scalar Higgs boson H with a mass m H near 125 GeV has been discovered [1,2], giving us the confidence in the physical picture of fundamental interactions which follows from the Standard Model Lagrangian. Some time later, the ATLAS Collaboration has reported first measurements of the Higgs boson differential cross sections in the γ γ decay mode [3]. The measured cross sections were found to be a bit higher than the central next-to-next-to-leading order (NNLO) expectations [4][5][6][7][8][9] and those matched with a soft-gluon resummation carried out up to next-to-next-to-leading logarithmic accuracy (NNLL) [10,11], although no significant deviations from the theoretical predictions are observed within the uncertainties [3]. The significant signal was detected also in channels where the Higgs boson decays into the Z Z or W W pairs [12,13]. The interaction of the Higgs particle with the massive Z and W bosons indicates that, as expected, it plays a role in electroweak symmetry breaking. However, a e-mail: lipatov@theory.sinp.msu.ru the interaction with the fermions and whether the Higgs field serves as the source of mass generation in the fermion sector still remain to be established. Since the Higgs boson with mass m H ∼ 125 GeV decays mainly into a beauty quarkantiquark pair [14], the observation and study of the H → bb decay (which involves the direct coupling of the Higgs boson to beauty quarks) is therefore essential in determining the nature of the newly discovered boson.The most sensitive channel for the H → bb events at the LHC is the production of a Higgs particle in association with the Z boson [15]. Despite the largest branching fraction (∼58 %), the H → bb final state is more difficult for the experimental observation compared to the signatures provided by the diphoton or diboson decay modes due to the small signal over background ratio. One of the main backgrounds for the associated Higgs and Z boson production is the associated production of Z boson and two b-quark jets. The corresponding cross sections, calculated at the NNLO level (see [14]), are several orders of magnitude larger than the Higgs boson signal. However, recently the CMS Collaboration reported [16] an excess o...

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Small-x phenomenology – Summary of the 3rd Lund small-x workshop in 2004

Abstract: Abstract. A third workshop on small-x physics, within the Small-x Collaboration, was held in Hamburg in May 2004 with the aim of overviewing recent theoretical progress in this area and summarizing the experimental status.

Cited by 90 publications

References 279 publications

Forward jet production at the Large Hadron Collider

Forward jet production at the Large Hadron Collider

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

On the possibility to detect the Higgs decay $$H\rightarrow b\bar{b}$$ H → b b ¯ in the associated $$Z+ b\bar{b}$$ Z + b b ¯ production at the LHC

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