1. 
 Aaron, F. D., et al.
(författare)

Multileptons with high transverse momentum at HERA
 2009

Ingår i: Journal of High Energy Physics.  : Springer Science and Business Media LLC.  10298479. ; :10

Tidskriftsartikel (refereegranskat)abstract
 Events with at least two high transverse momentum leptons (electrons or muons) are studied using the H1 and ZEUS detectors at HERA with an integrated luminosity of 0.94 fb(1). The observed numbers of events are in general agreement with the Standard Model predictions. Seven di and trilepton events are observed in e(+)p collision data with a scalar sum of the lepton transverse momenta above 100 GeV while 1.94 +/ 0.17 events are expected. Such events are not observed in e()p collisions for which 1.19 +/ 0.12 are predicted. Total visible and differential dielectron and dimuon photoproduction cross sections are extracted in a restricted phase space dominated by photonphoton collisions.


2. 
 Aaron, F. D., et al.
(författare)

Events with an isolated lepton and missing transverse momentum and measurement of W production at HERA
 2010

Ingår i: Journal of High Energy Physics.  10298479. ; 2010:3, s. 119

Tidskriftsartikel (refereegranskat)abstract
 A search for events containing an isolated electron or muon and missing trans verse momentum produced in e(+/)p collisions is performed with the H1 and ZEUS detectors at HERA. The data were taken in the period 19942007 and correspond to an integrated luminosity of 0.98 fb(1). The observed event yields are in good overall agreement with the Standard Model prediction, which is dominated by single W production. In the e(+)p data, at large hadronic transverse momentum PT(X) > 25GeV, a total of 23 events are observed compared to a prediction of 14.0 +/ 1.9. The total single W boson production cross section is measured as 1.06 +/ 0.16 (stat.) +/ 0.07 (sys.) pb, in agreement with an Standard Model (SM) expectation of 1.26 +/ 0.19 pb.


3. 
 Aaron, F. D., et al.
(författare)

Combined measurement and QCD analysis of the inclusive e(+/)p scattering cross sections at HERA
 2010

Ingår i: Journal of High Energy Physics.  10298479. ; :1

Tidskriftsartikel (refereegranskat)abstract
 A combination is presented of the inclusive deep inelastic cross sections measured by the H1 and ZEUS Collaborations in neutral and charged current unpolarised e(+/)p scattering at HERA during the period 19942000. The data span six orders of magnitude in negative fourmomentumtransfer squared, Q(2), and in Bjorken x. The combination method used takes the correlations of systematic uncertainties into account, resulting in an improved accuracy. The combined data are the sole input in a NLO QCD analysis which determines a new set of parton distributions, HERAPDF1.0, with small experimental uncertainties. This set includes an estimate of the model and parametrisation uncertainties of the fit result.


4. 
 Aaron, F. D., et al.
(författare)

Combined inclusive diffractive cross sections measured with forward proton spectrometers in deep inelastic ep scattering at HERA
 2012

Ingår i: European Physical Journal C. Particles and Fields.  : Springer Science and Business Media LLC.  14346044. ; 72:10

Tidskriftsartikel (refereegranskat)abstract
 A combination of the inclusive diffractive cross section measurements made by the H1 and ZEUS Collaborations at HERA is presented. The analysis uses samples of diffractive deep inelastic ep scattering data at a centreofmass energy root s = 318 GeV where leading protons are detected by dedicated spectrometers. Correlations of systematic uncertainties are taken into account, resulting in an improved precision of the cross section measurement which reaches 6 % for the most precise points. The combined data cover the range 2.5 < Q(2) < 200 GeV2 in photon virtuality, 0.00035 < x(P) < 0.09 in proton fractional momentum loss, 0.09 < vertical bar t vertical bar < 0.55 GeV2 in squared fourmomentum transfer at the proton vertex and 0.0018 < beta < 0.816 in beta = x/x(P), where x is the Bjorken scaling variable.


5. 
 Abramowicz, H., et al.
(författare)

Combination and QCD analysis of charm production cross section measurements in deepinelastic ep scattering at HERA
 2013

Ingår i: European Physical Journal C. Particles and Fields.  : Springer Science and Business Media LLC.  14346044. ; 73:2

Tidskriftsartikel (refereegranskat)abstract
 Measurements of open charm production cross sections in deepinelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections sigma(c (c) over bar)(red) for charm production are obtained in the kinematic range of photon virtuality 2.5 <= Q(2) <= 2000 GeV2 and Bjorken scaling variable 3 . 10(5) <= x <= 5 . 10(2). The combination method accounts for the correlations of the systematic uncertainties among the different data sets. The combined charm data together with the combined inclusive deepinelastic scattering cross sections from HERA are used as input for a detailed NLO QCD analysis to study the influence of different heavy flavour schemes on the parton distribution functions. The optimal values of the charm mass as a parameter in these different schemes are obtained. The implications on the NLO predictions for W+/ and Z production cross sections at the LHC are investigated. Using the fixed flavour number scheme, the running mass of the charm quark is determined.


6. 
 Abt, I, et al.
(författare)

Inclusive V0 production cross sections from 920 GeV fixed target protonnucleus collisions
 2003

Ingår i: European Physical Journal C. Particles and Fields.  : Springer Science and Business Media LLC.  14346044. ; 29:2, s. 181190

Tidskriftsartikel (refereegranskat)abstract
 Inclusive differential cross sections dsigma(pA)/dx(F) and dsigma(pA)/dp(t)(2) for the production of KS(0), Lambda, and (&ULambda;) over bar particles are measured at HERA in protoninduced reactions on C, Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to roots = 41.6 GeV in the protonnucleon system. The ratios of differential cross sections dsigma(pA)(KS(0))/dsigma(pA)(Lambda) and dsigma(pA)((&ULambda;) over bar)/dsigma(pA) (Lambda) are measured to be 6.2 +/ 0.5 and 0.66 +/ 0.07, respectively, for x(F) approximate to 0.06. No significant dependence upon the target material is observed. Within errors, the slopes of the transverse momentum distributions da,Ald t also show no significant dependence upon the target material. The dependence of the extrapolated total cross sections sigma(pA) on the atomic mass A of the target material is discussed, and the deduced cross sections per nucleon sigma(pN) are compared with results obtained at other energies.


7. 
 Abt, I, et al.
(författare)

Measurement of the b(b)overbar production cross section in 920 GeV fixedtarget protonnucleus collisions
 2003

Ingår i: European Physical Journal C. Particles and Fields.  : Springer Science and Business Media LLC.  14346044. ; 26:3, s. 345355

Tidskriftsartikel (refereegranskat)abstract
 Using the HERAB detector, the b (b) over bar production cross section has been measured in 920 GeV proton collisions on carbon and titanium targets. The b (b) over bar production was tagged via inclusive bottom quark decays into J/psi by exploiting the longitudinal separation of J/psi > l(+)l() decay vertices from the primary protonnucleus interaction. Both e(+)e() and mu(+)mu() channels have been reconstructed and the combined analysis yields the cross section sigma(b (b) over bar) = 32(12)(+14)(stat) (+6)(7)(sys) nb/nucleon.


8. 
 Ade, P. A. R., et al.
(författare)

Planck 2015 results XIV. Dark energy and modified gravity
 2016

Ingår i: Astronomy and Astrophysics.  : EDP Sciences.  00046361 . 14320746. ; 594

Tidskriftsartikel (refereegranskat)abstract
 We study the implications of Planck data for models of dark energy (DE) and modified gravity (MG) beyond the standard cosmological constant scenario. We start with cases where the DE only directly affects the background evolution, considering Taylor expansions of the equation of state w(a), as well as principal component analysis and parameterizations related to the potential of a minimally coupled DE scalar field. When estimating the density of DE at early times, we significantly improve present constraints and find that it has to be below similar to 2% (at 95% confidence) of the critical density, even when forced to play a role for z < 50 only. We then move to general parameterizations of the DE or MG perturbations that encompass both effective field theories and the phenomenology of gravitational potentials in MG models. Lastly, we test a range of specific models, such as kessence, f(R) theories, and coupled DE. In addition to the latest Planck data, for our main analyses, we use background constraints from baryonic acoustic oscillations, typeIa supernovae, and local measurements of the Hubble constant. We further show the impact of measurements of the cosmological perturbations, such as redshiftspace distortions and weak gravitational lensing. These additional probes are important tools for testing MG models and for breaking degeneracies that are still present in the combination of Planck and background data sets. All results that include only background parameterizations (expansion of the equation of state, early DE, general potentials in minimallycoupled scalar fields or principal component analysis) are in agreement with ACDM. When testing models that also change perturbations (even when the background is fixed to ACDM), some tensions appear in a few scenarios: the maximum one found is similar to 2 sigma for Planck TT + lowP when parameterizing observables related to the gravitational potentials with a chosen time dependence; the tension increases to, at most, 3 sigma when external data sets are included. It however disappears when including CMB lensing.


9. 
 Ade, P. A. R., et al.
(författare)

Planck 2015 results XX. Constraints on inflation
 2016

Ingår i: Astronomy and Astrophysics.  : EDP Sciences.  00046361 . 14320746. ; 594

Tidskriftsartikel (refereegranskat)abstract
 We present the implications for cosmic inflation of the Planck measurements of the cosmic microwave background (CMB) anisotropies in both temperature and polarization based on the full Planck survey, which includes more than twice the integration time of the nominal survey used for the 2013 release papers. The Planck full mission temperature data and a first release of polarization data on large angular scales measure the spectral index of curvature perturbations to be n(s) = 0.968 +/ 0.006 and tightly constrain its scale dependence to dn(s)/dln k = 0.003 +/ 0.007 when combined with the Planck lensing likelihood. When the Planck highl polarization data are included, the results are consistent and uncertainties are further reduced. The upper bound on the tensortoscalar ratio is r(0).(002) < 0.11 (95% CL). This upper limit is consistent with the Bmode polarization constraint r < 0.12 (95% CL) obtained from a joint analysis of the BICEP2/Keck Array and Planck data. These results imply that V(phi) proportional to phi(2) and natural inflation are now disfavoured compared to models predicting a smaller tensortoscalar ratio, such as R2 inflation. We search for several physically motivated deviations from a simple powerlaw spectrum of curvature perturbations, including those motivated by a reconstruction of the inflaton potential not relying on the slowroll approximation. We find that such models are not preferred, either according to a Bayesian model comparison or according to a frequentist simulationbased analysis. Three independent methods reconstructing the primordial power spectrum consistently recover a featureless and smooth PR (k) over the range of scales 0.008 Mpc(1) less than or similar to k less than or similar to 0.1 Mpc(1). At large scales, each method finds deviations from a power law, connected to a deficit at multipoles l approximate to 2040 in the temperature power spectrum, but at an uncompelling statistical significance owing to the large cosmic variance present at these multipoles. By combining power spectrum and nonGaussianity bounds, we constrain models with generalized Lagrangians, including Galileon models and axion monodromy models. The Planck data are consistent with adiabatic primordial perturbations, and the estimated values for the parameters of the base Lambda cold dark matter (Lambda CDM) model are not significantly altered when more general initial conditions are admitted. In correlated mixed adiabatic and isocurvature models, the 95% CL upper bound for the nonadiabatic contribution to the observed CMB temperature variance is vertical bar alpha(nonadi)vertical bar < 1.9%, 4.0%, and 2.9% for CDM, neutrino density, and neutrino velocity isocurvature modes, respectively. We have tested inflationary models producing an anisotropic modulation of the primordial curvature power spectrum finding that the dipolar modulation in the CMB temperature field induced by a CDM isocurvature perturbation is not preferred at a statistically significant level. We also establish tight constraints on a possible quadrupolar modulation of the curvature perturbation. These results are consistent with the Planck 2013 analysis based on the nominal mission data and further constrain slowroll singlefield inflationary models, as expected from the increased precision of Planck data using the full set of observations.


10. 
 Ade, P. A. R., et al.
(författare)

Planck 2015 results XXVI. The Second Planck Catalogue of Compact Sources
 2016

Ingår i: Astronomy and Astrophysics.  : EDP Sciences.  00046361 . 14320746. ; 594

Tidskriftsartikel (refereegranskat)abstract
 The Second Planck Catalogue of Compact Sources is a list of discrete objects detected in singlefrequency maps from the full duration of the Planck mission and supersedes previous versions. It consists of compact sources, both Galactic and extragalactic, detected over the entire sky. Compact sources detected in the lower frequency channels are assigned to the PCCS2, while at higher frequencies they are assigned to one of two subcatalogues, the PCCS2 or PCCS2E, depending on their location on the sky. The first of these (PCCS2) covers most of the sky and allows the user to produce subsamples at higher reliabilities than the target 80% integral reliability of the catalogue. The second ( PCCS2E) contains sources detected in sky regions where the diffuse emission makes it difficult to quantify the reliability of the detections. Both the PCCS2 and PCCS2E include polarization measurements, in the form of polarized flux densities, or upper limits, and orientation angles for all seven polarizationsensitive Planck channels. The improved dataprocessing of the fullmission maps and their reduced noise levels allow us to increase the number of objects in the catalogue, improving its completeness for the target 80% reliability as compared with the previous versions, the PCCS and the Early Release Compact Source Catalogue (ERCSC).

