Physics at a Fermilab proton driver

Albrow, M.; Antusch, Stefan; Babu, K. S.; Barnes, T.; Bazarko, A.O.; Bernstein, R. H.; Bowles, T.; Brice, S. J.; Ceccucci, A.; Cei, F.; KCheung, H. W.; Christian, D. C.; Collar, J. I.; Cooper, J.; Cooper, P. S.; Curioni, A.; deGouvea, A.; DeJongh, F.; Derwent, P. F.; Diwan, M.; Dobrescu, Bogdan A.; Feldman, G. J.; Finley, D. A.; Fleming, B. T.; Geer, S.; Greene, Geoffrey L.; Grossman, Yuval; Harris, D. A.; Horowitz, C. J.; Hertzog, D. W.; Imazato, J.; Jansson, Andreas; Jungmann, Klaus-Peter; Kasper, P.; Kersten, Joern; Kettell, S. H.; Kuno, Y.; Lindner, M.; Mandelkern, M.; Marciano, W.; Melnitchouk, W.; Mena, Olga; Michael, D. G.; Miller, J.; Mills, G. B.; Morfín, J.; Nguyen, H. K.

doi:10.2172/1155154

Cited by 191 publications

(369 citation statements)

References 76 publications

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“…For the purpose of comparing the present measurement to different phenomenological models describing minimum-bias events, the following additional PYTHIA6 samples were generated: the ATLAS data-based AMBT1 tune [11], which was ob- tained by attempting to fit charged particle multiplicity distributions in a diffraction limited phase-space; the Perugia0 tune [12], in which soft-QCD part is tuned using only minimum-bias data from the Tevatron and CERN pp colliders; the DW tune [13], which uses the virtuality-ordered showers and was derived to describe the CDF Run II underlying event and Drell-Yan data. In addition, the PYTHIA8 generator [14] was used which includes new features such as hard scattering in diffractive systems, up-to-date parton density function (pdf) set, a possibility to use one pdf set for hard scattering and another for the rest.…”

Section: Monte Carlo Modelsmentioning

confidence: 99%

Soft QCD in ATLAS: Minimum bias and diffraction studies

Sarkisyan-Grinbaum

2011

Phys. Part. Nuclei Lett.

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We present measurements of charged particle production in proton-proton collisions at centre-of-mass energies of √ s = 0.9, 2.36 and 7 TeV recorded with the ATLAS detector at the Large Hadron Collider. Events were collected using a single-arm minimum bias trigger, charged tracks are measured with high precision in the inner tracking system. Minimum bias analysis uses data samples at all three energies, while diffractive events are studied using a sample of events at √ s = 7 TeV. To study diffractive interactions, the events that have hits on exactly one side of the ATLAS detector were selected. The charged particle multiplicity, pseudorapidity and transverse momentum spectra are analyzed and compared to the predictions by various Monte Carlo models.

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Section: Monte Carlo Modelsmentioning

confidence: 99%

Soft QCD in ATLAS: Minimum bias and diffraction studies

Sarkisyan-Grinbaum

2011

Phys. Part. Nuclei Lett.

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“…The correction factors C MPI and C Had were estimated using inclusive Z /γ * (→ e + e − ) event samples generated with pythia v6.416 using Tune QW [21], pythia v6.416 using Tune S0 [22], herwig v6.510 + jimmy v4.31 [23], alpgen v2.13 + pythia v6.325 using Tune QW, and sherpa v1.1.1. The central values quoted in Tables 4-6 correspond to the predictions of pythia Tune QW.…”

Section: Pacsmentioning

confidence: 99%

Measurements of differential cross sections of Z/γ∗+jets+X events in pp
Abazov¹,
Abbott²,
Abolins³
et al. 2009
Physics Letters B
42
0
11
0
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We present cross section measurements for Z /γ * + jets + X production, differential in the transverse momenta of the three leading jets. The data sample was collected with the DØ detector at the Fermilab Tevatron pp collider at a center-of-mass energy of 1.96 TeV and corresponds to an integrated luminosity of 1 fb −1 . Leading and next-to-leading order perturbative QCD predictions are compared with the measurements, and agreement is found within the theoretical and experimental uncertainties. We also make comparisons with the predictions of four event generators. Two parton-shower-based generators show significant shape and normalization differences with respect to the data. In contrast, two generators combining tree-level matrix elements with a parton shower give a reasonable description of the shapes observed in data, but the predicted normalizations show significant differences with respect to the data, reflecting large scale uncertainties. For specific choices of scales, the normalizations for either generator can be made to agree with the measurements. Letters B 678 (2009) [45][46][47][48][49][50][51][52][53][54] The production of jets in association with vector bosons (V + jets) in hadron collisions is an important process in quantum chromodynamics (QCD) and is a significant source of background for many standard model measurements (e.g., tt production) and in searches for new phenomena (e.g., supersymmetry). Such measurements at the Fermilab Tevatron collider and the CERN Large Hadron Collider (LHC) rely on accurate descriptions of V + jets production by particle-level event generators. These models require validation with measurements of the properties of the V + jets system, especially as a function of jet multiplicity. DØ Collaboration / PhysicsIn In particular, we have investigated to what extent the differential p T distributions for the higher jet multiplicities can be described by parton-shower-based event generators like pythia [6] and herwig [7], and how they compare to event generator predictions where matrix element and parton shower merging procedures are adopted, as in alpgen + pythia [8] and sherpa [9]. For each prediction, the renormalization and factorization scale uncertainties are evaluated, and the choices of scales are modified to achieve an improved description of the measurements. The presented studies are of vital importance to understand the predictive power of the various event generator models for V + jets processes at both the Tevatron and the LHC.The data set was recorded using the DØ Run II detector, which is described in detail elsewhere [10]. Here we give a brief overview of the most relevant components for this analysis. The trajectories of charged particles are reconstructed using a silicon vertex tracker and a scintillating fiber tracker located inside a superconducting solenoidal coil that provides a magnetic field of approximately 2 T. The tracking volume is surrounded by a liquidargon and uranium calorimeter, divided into electromagnetic and hadronic sections with...

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“…4 the anticipated evolution of the θ 13 discovery reach for the global neutrino program, see details in Ref. [38].…”

Section: Future Prospectsmentioning

confidence: 99%

“…The hunt for θ 13 : artist's view of anticipated sensitivities on θ 13 given in Ref. [38]. must to have a near detector capable of sorting out for NSI with high sensitivity.…”

Section: Future Prospectsmentioning

confidence: 99%

Concluding talk at NOW 2006

Valle

2007

Nuclear Physics B - Proceedings Supplements

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This writeup summarizes the status of neutrino oscillations, including recent fluxes and experimental data, as of summer 2006. A discussion is given on the current status of absolute scale of neutrino mass from tritium, 0νββ and cosmological observations, as well as the prospects for the next generation of experiments, including lepton flavour violation searches, and their theoretical significance. IntoductionWith almost 30 plenary talks and 70 parallel session talks the task of summarizing all of them all into a single talk is an impossible mission. I will try instead simply to highlight some aspects of the talks that touched my own prejudices.The progress in the physics of neutrino oscillations in the last few years has been truly remarkable. Oscillations are now established, implying that neutrinos have masses, as first suggested by theorists in the early eighties, both on general grounds [1,2] and on the basis of various versions of the seesaw mechanism [3]. This is a profound discovery that marks the beginning of a new age in neutrino physics.A gold rush towards precision results has been initiated, whose aim is to probe θ 13 , to study leptonic CP violation and determine the nature of neutrinos. Hopefully this will shed light on the ultimate origin the universe and certainly that of neutrino mass. DataThanks to the accumulation of events over a wide range of energy, and to the measurement over neutrino energy E) distribution of the muon neutrino disappearance probability, the interpretation of the atmospheric data has finally turned into an unambiguous signal of ν µ ↔ ν τ oscillations, marking the beginning of a new era.The interpretation of solar data per se is still ambiguous, with viable alternative explanations involving spin flavour precession [4,5] or nonstandard neutrino interactions [6]. Results on (or relevant to) solar neutrinos were presented here by Broggini, Maneira, Pulido, Raghavan, Ranucci, Serenelli and Smy. Reactor neutrino data from KamLAND not only confirm the solar neutrino deficit but also observe the spectrum distortion as expected for oscillations. Reactors have played an important role in establishing the robustness of the neutrino flavor oscillation interpretation vis a vis the existence of solar density fluctuations [7] in the solar radiative zone as produced by random magnetic fields [8], and also with respect to the effect of convective zone magnetic fields, should neutrinos posses nonzero neutrino transition magnetic moments [9]. Within the oscillation picture KamLAND has also identified large mixing angle oscillation as its "unique" solution, "solving", in a sense, the solar neutrino problem. Note however that the interpretation of solar data vis a vis neutrino non-standard interactions [10] is not yet so robust.A lot more is to come from the upcoming reactor experiments starting with Double-Chooz,

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Physics at a Fermilab proton driver

Cited by 191 publications

References 76 publications

Soft QCD in ATLAS: Minimum bias and diffraction studies

Soft QCD in ATLAS: Minimum bias and diffraction studies

Measurements of differential cross sections of Z/γ∗+jets+X events in pp
Abazov¹,
Abbott²,
Abolins³
et al. 2009
Physics Letters B
42
0
11
0
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Concluding talk at NOW 2006

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Physics at a Fermilab proton driver

Cited by 191 publications

References 76 publications

Soft QCD in ATLAS: Minimum bias and diffraction studies

Soft QCD in ATLAS: Minimum bias and diffraction studies

Measurements of differential cross sections of Z/γ∗+jets+X events in ppAbazov1, Abbott2, Abolins3 et al. 2009Physics Letters B420110View full textAdd to dashboardCite

Concluding talk at NOW 2006

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Measurements of differential cross sections of Z/γ∗+jets+X events in pp
Abazov¹,
Abbott²,
Abolins³
et al. 2009
Physics Letters B
42
0
11
0
View full text Add to dashboard Cite