High-energy-physics event generation with Pythia 6.1

Sjöstrand, Torbjörn; Edén, P.; Friberg, Christer; Lönnblad, Leif; Miu, Gabriela; Mrenna, S.; Norrbin, E.

doi:10.1016/s0010-4655(00)00236-8

Cited by 2,644 publications

(2,755 citation statements)

References 57 publications

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“…(52), a dedicated PYTHIA Monte Carlo (MC) [42] simulation was used to generate exclusively produced ρ 0 events with a uniform angular distribution, hereafter referred to as "uniform exclusive ρ 0 MC" [17,38]. The total number of generated events is by a factor of one hundred larger than that of the experimental data.…”

Section: Fit Of the Angular Distributionmentioning

confidence: 99%

Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

et al. 2017

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Exclusive ρ 0 -meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized hydrogen target, in the kinematic region 1.0 GeV 2 < Q 2 < 7.0 GeV 2 , 3.0 GeV < W < 6.3 GeV, and −t < 0.4 GeV 2 . Using an unbinned maximum-likelihood method, 25 parameters are extracted. These determine the real and imaginary parts of the ratios of several helicity amplitudes describing ρ 0 -meson production by a virtual photon. The denominator of those ratios is the dominant amplitude, the nucleon-helicity-non-flip amplitude F 0 1 2 0 1 2 , which describes the production of a longitudinal ρ 0 -meson by a longitudinal virtual photon. The ratios of nucleon-helicity-nonflip amplitudes are found to be in good agreement with those from the previous HERMES analysis. The transverse target polarization allows for the first time the extraction of ratios of a number of nucleon-helicity-flip amplitudes to F 0 1 2 0 1 2 . Results obtained in a handbag approach based on generalized parton distributions taking into account the contribution from pion exchange are found to be in good agreement with these ratios. Within the model, the data favor a positive sign for the π − ρ transition form factor. By also exploiting the longitudinal beam polarization, a total of 71 ρ 0 spin-density matrix elements is determined from the extracted 25 parameters, in contrast to only 53 elements as directly determined in earlier analyses.

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Section: Fit Of the Angular Distributionmentioning

confidence: 99%

Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

et al. 2017

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“…All others were calculated with PYTHIA 6.2 [8]. Signal and WW b ackground events were generated with PYTHIA 6.2.…”

Section: Signal and Background Simulation Cross Sections And Branchimentioning

confidence: 99%

Light charged Higgs discovery potential of CMS in the H^± → τν_τ decay with single lepton trigger

Baarmand

Hashemi

Nikitenko

2006

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

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“…Once the cross-section is determined, the electron spectrum at higher p T can be used to sensitively infer the charmed hadron spectral shape. Meanwhile, we survey the form factors used in charm semileptonic decays generated from Particle Data Group [24], in the PYTHIA event generator [11,12,13,25], by pQCD predictions [1] and from the CLEO inclusive measurement [26]. We find that the lepton spectra from these different form factors can be different by a factor of 1.5.…”

Section: Are Leptonic Spectra Sensitive To Charm Flow?mentioning

confidence: 99%

“…Since PYTHIA uses a simplified vector meson decay form factor [25], it tends to produce a softer electron spectrum. Both the parameterization by Cacciari [1] and formulae from the PDG agree with CLEO's electron spectrum [26].…”

Section: Form Factorsmentioning

confidence: 99%

Overview of charm production at RHIC

Xu¹

2006

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

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Abstract. In this presentation, I discussed a) the charm total cross-section and its comparisons to measurements at other beam energies and pQCD calculations; b) the semileptonic decay of charmed hadrons and the sensitivity of non-photonic leptons to charm quark collective flow and freeze-out; c) semileptonic decayed electron spectrum at high transverse momentum, its comparison to FONLL in p+p and d+Au collisions, and heavy-quark energy loss in Au+Au collisions.In relativistic heavy-ion collisions, charm quarks are believed to be produced in the early stage via initial gluon fusion and their production cross-section can be evaluated using perturbative QCD [1]. Study of the N bin scaling properties of the charm total cross-section in p+p, d+Au and Au+Au collisions can test if heavy-flavor quarks, which are used as a probe, are produced exclusively at the initial impact. The interactions of heavy quarks with the medium provide a unique tool for probing the hot and dense matter created in ultra-relativistic heavy-ion collisions at the early times. At RHIC energies, heavy quark energy loss [2], charm quark coalescence [3,4,5,6], the effect of J/ψ production from charm quark coalescence on the interpretation of possible J/ψ suppression due to color screening [7], and charm flow [8,9,10] have been proposed as important tools in studying the properties of matter created in heavy ion collisions. The last three effects depend strongly on the charm total cross-section and spectrum at low p T .Since the beginning of RHIC operation, PHENIX and STAR collaborations have made pioneer measurements in charm related physics [11,12,13,14,15,16] ‡. New measurements presented at this conference are: (i) muon spectra at forward rapidity (1.4 < |y| < 2.2) from charm semileptonic decay by PHENIX Collaboration [16]. This enables us to study the rapidity dependence of nuclear effects of charm production.(ii) muon spectra at low p T (0.17 < p T < 0.25 GeV/c) from charm semileptonic decay by STAR Collaboration [15]. This improves the charm total cross-section measurements and better constrains the charm spectrum for studying the charm radial flow. ‡ The overviews of charm elliptic flow and quarkonium can be found elsewhere [17,18]

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High-energy-physics event generation with Pythia 6.1

Cited by 2,644 publications

References 57 publications

Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

Light charged Higgs discovery potential of CMS in the H^± → τν_τ decay with single lepton trigger

Overview of charm production at RHIC

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High-energy-physics event generation with Pythia 6.1

Cited by 2,644 publications

References 57 publications

Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

Light charged Higgs discovery potential of CMS in the H± → τντ decay with single lepton trigger

Overview of charm production at RHIC

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Product

Resources

About

Light charged Higgs discovery potential of CMS in the H^± → τν_τ decay with single lepton trigger