A next-to-leading order study of photon-pion and pion pair hadro-production in the light of the Higgs boson search at the LHC

Binoth, T.; Guillet, J. Ph.; Pilon, E.; Werlen, M.

doi:10.1007/s1010502c0007

Cited by 16 publications

(11 citation statements)

References 23 publications

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“…At low E T the uncertainty in the cross sections linked to scales variations amounts to up to ±20% but it saturates at around ±10% above E γ T ≈ 15 GeV at central and forward rapidities. As aforementioned, global PDF fits do not reliably determine the gluon for x 10 −2 at low, yet perturbative, Q 2 20 GeV 2 scales [42]. This is due partly to the lack of precise structure function data for x < 10 −4 and mainly due to the fact that the copious DIS F 2 results probe the quark distribution, while the gluon density is constrained by the evolution, log(Q 2 ) dependence, of these data.…”

Section: Isolated Photon Production At the Lhcmentioning

confidence: 98%

“…often exemplified in the Higgs boson decay into two high-E T photons [2]). From a pQCD perspective, prompt photons issuing from hard parton-parton scatterings constitute a particularly clean testbed of perturbation theory in the collinear- [3,4] and k T - [5] factorization (or colour-dipole [6,7]) approaches as well as of various logarithmic resummation techniques [8].…”

Section: Introductionmentioning

confidence: 99%

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Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton

Ichou

d’Enterria

2010

Phys. Rev. D

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We compare the single inclusive spectra of isolated photons measured at high transverse energy in proton-antiproton collisions at √ s = 1.96 TeV with next-to-leading order perturbative QCD predictions with various parametrizations of the parton distribution functions (PDFs). Within the experimental and theoretical uncertainties, the Tevatron data can be reproduced equally well by the recent CTEQ6.6, MSTW08 and NNPDF1.2 PDF sets. We present also the predictions for isolated γ spectra in proton-proton collisions at √ s = 14 TeV for central (y = 0) and forward (y = 4) rapidities relevant for LHC experiments. Different proton PDFs result in maximum variations of order ±30% in the expected E γ T -differential isolated γ cross sections. The inclusion of the isolated photon data in global PDF fits will place extra independent constraints on the gluon density.

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Section: Isolated Photon Production At the Lhcmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton

Ichou

d’Enterria

2010

Phys. Rev. D

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“…The new p T thresholds are 80 GeV/c for the single-photon trigger and (30,20) GeV/c for the diphoton trigger (both relaxed and non-relaxed flavours). A few prescaled single-and double-photon triggers have also been introduced, for the purpose of studying trigger efficiencies.…”

Section: E42 Evolution Of Daq-tdr Triggersmentioning

confidence: 99%

“…Pile-up events from minimum bias interactions were added to the hard interaction, assuming a luminosity of L = 2 × 10 33 cm −2 s −1 . K-factors are applied to take into account the expected differences between the lowest order cross sections given by pythia and the NLO cross sections of the different background processes [26][27][28][29][30]. The K-factors used for each background are summarised in Table 2.3 and are estimated to have an uncertainty of 20-30%.…”

Section: Backgroundsmentioning

confidence: 99%

CMS Physics Technical Design Report, Volume II: Physics Performance

Bayatian¹,

Chatrchyan²,

Hmayakyan³

et al. 2007

J. Phys. G: Nucl. Part. Phys.

715

161

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CMS is a general purpose experiment, designed to study the physics of pp collisions at 14 TeV at the Large Hadron Collider (LHC). It currently involves more than 2000 physicists from more than 150 institutes and 37 countries. The LHC will provide extraordinary opportunities for particle physics based on its unprecedented collision energy and luminosity when it begins operation in 2007.The principal aim of this report is to present the strategy of CMS to explore the rich physics programme offered by the LHC. This volume demonstrates the physics capability of the CMS experiment. The prime goals of CMS are to explore physics at the TeV scale and to study the mechanism of electroweak symmetry breaking-through the discovery of the Higgs particle or otherwise. To carry out this task, CMS must be prepared to search for new particles, such as the Higgs boson or supersymmetric partners of the Standard Model particles, from the start-up of the LHC since new physics at the TeV scale may manifest itself with modest data samples of the order of a few fb −1 or less. The analysis tools that have been developed are applied to study in great detail and with all the methodology of performing an analysis on CMS data specific benchmark processes upon which to gauge the performance of CMS. These processes cover several Higgs boson decay channels, the production and decay of new particles such as Z and supersymmetric particles, B s production and processes in heavy ion collisions. The simulation of these benchmark processes includes subtle effects such as possible detector miscalibration and misalignment. Besides these benchmark processes, the physics reach of CMS is studied for a large number of signatures arising in the Standard Model and also in theories beyond the Standard Model for integrated luminosities ranging from 1 fb −1 to 30 fb −1 . The Standard Model processes include QCD, B-physics, diffraction, detailed studies of the top quark properties, and electroweak physics topics such as the W and Z 0 boson properties. The production and decay of the Higgs particle is studied for many observable decays, and the precision with which the Higgs boson properties can be derived is determined. About ten different supersymmetry benchmark points are analysed using full simulation. The CMS discovery reach is evaluated in the SUSY parameter space covering a large variety of decay signatures.

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“…At leading order in QCD, the basic two-particle γ-π 0 correlation cross section, from which various observables are constructed, can be written [40,41]:…”

Section: Double Inclusive Productionmentioning

confidence: 99%

Hard pion and prompt photon at RHIC, from single to double inclusive production

Arleo¹

2006

J. High Energy Phys.

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Single pion and prompt photon large transverse momentum spectra in pp and Au-Au collisions are computed in perturbative QCD at RHIC energy, √ s NN = 200 GeV. Next-to-leading order calculations are discussed and compared with p-p scattering data. Subsequently, quenching factors are computed to leading order for both pions and photons within the same energy loss model. The good agreement with PHENIX preliminary data allows for a lower estimate of the energy density reached in central Au-Au collisions, RHIC 10 GeV/fm 3 . Double inclusive γ-π 0 production in p-p and Au-Au collisions is then addressed. Next-to-leading order corrections prove rather small in p-p scattering. In Au-Au collisions, the quenching of momentum-correlation spectra is seen to be sensitive to parton energy loss processes, which would help to understand how the fragmentation dynamics is modified in nuclear collisions at RHIC.

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A next-to-leading order study of photon-pion and pion pair hadro-production in the light of the Higgs boson search at the LHC

Cited by 16 publications

References 23 publications

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton

CMS Physics Technical Design Report, Volume II: Physics Performance

Hard pion and prompt photon at RHIC, from single to double inclusive production

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