Inclusive Measurements and Fits |
H1prelim-06-142
ZEUS-prel-06-022
H1 and ZEUS |
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Electroweak Neutral Currents at HERA |
| Reference |
H1 & ZEUS combined results, presented by V. Chekelian at ICHEP 06, Summer 2006
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| Document | Conference paper or talk |
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| Contact | M. Klein, E. Rizvi, V. Chekelian |
| Abstract | Measurements by the H1 and ZEUS collaborations of the neutral current cross sections
of deep inelastic polarised electron and positron-proton scattering are combined in
order to investigate the interference of weak and electromagnetic interactions at
high four-momentum transfer squared, Q2. The data provide the most accurate
measurements of the interference structure function xF3^{gamma Z}, which is
sensitive to the valence quark distributions down to lower values of Bjorken x.
The data on polarised cross section asymmetries, A^{\pm}, lead to the first
observation of parity violation in neutral current e^{\pm} p scattering
at distances down to 10^{-18} m. |
| Links |
H1 and ZEUS combined results List of H1 papers
H1 internal information
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Rare and Exotic Processes |
Diffraction |
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Extraction of diffractive PDFs at NNLO |
| Reference |
April 2019
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| Document | Conference paper or talk |
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| Contact | R. Zlebcik |
| Abstract | A new fit of diffractive parton distribution functions (DPDFs) to the HERA inclusive and jet data in diffractive deep-inelastic scattering (DDIS) at next-to-next-to-leading order accuracy (NNLO) is presented. The inclusion of the most comprehensive dijet cross section data, together with their NNLO predictions, provide enhanced constraints to the gluon component of the DPDF, which is of particular importance for diffractive PDFs. Compared to previous HERA fits, the presented fit includes the high-precision HERA-II data of the H1 collaboration, which corresponds to a 40-fold increase in luminosity for inclusive data (six-fold increase for jet data). In addition to the inclusive sample at nominal centre-of-mass energy sqrt(s)=319, inclusive H1 data at 252 and 225 GeV are included. The extracted DPDFs are compared to previous DPDF fits, and are used to predict cross sections for a large number of available measurements and different observables. |
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back to overview listing
H1 internal information
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Exclusive Photoproduction of 2pi+2pi- Final State at HERA |
| Reference |
April 2018
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| Document | Conference paper or talk |
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| Contact | S. Levonian |
| Abstract | Exclusive production of four charged pions at the ep collider HERA is studied at small photon virtualities Q^2 < 2 GeV^2.
The data were taken with the H1 detector in the years 2006 and 2007 at a centre-of-mass energies of 319 GeV and 225 GeV
and correspond to an integrated luminosity of 7.6 pb-1 and 1.7 pb-1 respectively.
The cross section of the reaction gamma p -> (2pi+2pi-)Y is determined in the phase space of 35 < W < 100 GeV, |t| < 1 GeV2
and M_Y < 1.6 GeV. The 4pi mass spectra indicate that the reaction proceeds predominantly via production and decay of
rho-prime resonances. The fit however does not allow yet to distinguish unambiguously between the hypothesis
of one or two broad and overlapping rho-prime resonances. |
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back to overview listing
H1 internal information
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Forward neutron PT distributions |
| Reference |
Preliminary ICHEP2010, July 2010
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| Figures |
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| Abstract | The production of leading neutrons, where the neutron carries a large fraction x_L of the incoming proton's longitudinal momentum,
is studied in deep-inelastic positron-proton scattering at HERA. The data are taken with the H1 detector in the years 2006 and 2007
and correspond to an integrated luminosity of 122 pb-1. The semi-inclusive double differential cross sections are measured
as function of a neutron longitudinal momentum fraction x_L and neutron transverse momentum sqaured p_T^2 in the phase space
defined by the photon virtuality 6 < Q2 < 100 GeV2, the inelasticity 0.05 < y < 0.6, the longitudinal momentum fraction 0.32 < xL < 1.00
and transverse momentum p_T < xL*0.69 GeV of the neutron.
The slopes of p_T^2 distributions are extracted in bins of x_L and are compared to different pion flux parameterisations. |
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back to overview listing
H1 internal information
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F2D3 with VFPS |
| Reference |
Preliminary DIS2010, April 2010
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(f2d3summary_Q2)
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| Abstract | In 2004, the H1 Collaboration at HERA installed the Very Forward Proton
Spectrometer (VFPS) located at 220m from the interaction point, in the cold
section of the proton ring. The spectrometer consists of two Roman Pot
stations equipped with scintillating fiber detectors. The device allows the
measurement of diffractive proton momentum in the range 0.009 < xpom <
0.025, where xpom is the energy fraction lost by the proton in the
interaction, with a very high acceptance (above 90%).
The inclusive diffractive deep inelastic scattering, ep -> e gamma* p -> e
X p, has been measured with the H1 detector at HERA using VFPS to measure
the scattered proton momentum. The data correspond to an integrated
luminosity of 95 pb-1. The cross section has been measured for virtualities
of the exchanged boson, 5 < Q^2 < 100 GeV^2 and in the range 0.005 < beta <
0.8, where beta=x/xpom. The cross section is measured differentially in Q^2,
xpom and beta and compared to previously measured cross section at HERA. |
| Links |
back to overview listing
H1 internal information
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Hadronic Final State and QCD |
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Machine learning-assisted measurement of azimuthal angular asymmetries in deep-inelastic scattering with the H1 detector |
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Charge asymmetry Jet substructure in DIS |
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Multi-differential measurements of TMD-sensitive variables at high Q^2 |
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Search for Collectivity in ep collisions with H1 |
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K0s Production at low Q^2 in Deep-Inelastic ep Scattering at HERA |
| Reference |
February 2013
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| Document | Conference paper or talk |
| Figures |
(1a)
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| Contact | K. Begzsuren, K. Daum |
| Abstract | The production of K0s mesons is investigated using deep-inelastic scattering events measured with the H1 detector at HERA. The measurements are made in the phase space defined by the negative four-momentum transfer squared of the photon 7 < Q^2 < 100 GeV^2 and the inelasticity 0.1 < y < 0.6. The K0s production cross sections are determined. K0s production is compared to the production of charged particles in the same region of phase space. Predictions of leading order Monte Carlo programs are compared to the data. |
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back to overview listing
H1 internal information
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Lambda Baryons at high $Q^2$ at HERA |
| Reference |
February 2013
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| Document | Conference paper or talk |
| Figures |
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| Contact | K. Cantun, K. Daum |
| Abstract | The production of Lambda baryons is studied using deep-inelastic events measured with the H1 detector at HERA.
The measurements are made in the phase space defined by the negative four-momentum transferred squared of the photon,
$145 < Q^2 < 20000~\mathrm{GeV}^2$, and the inelasticity $0.2 < y < 0.6$.
Differential Lambda production cross sections are measured. Differential Lambda yields per event are determined.
The Lambda - Anti-lambda asymmetry is measured and found to be consistent with zero.
Predictions of leading order Monte Carlo programs are compared to data. |
| Links |
back to overview listing
H1 internal information
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Measurement of charged particle production in deep-inelastic ep scattering at sqrt{s}=225 GeV at HERA |
| Reference |
February 2013
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| Document | Conference paper or talk |
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| Contact | A. Bylinkin, A. Rostovtsev |
| Abstract | Charged particle production is measured in deep inelastic ep scattering at sqrt{s}=225 GeV with the H1 detector at HERA. The kinematic range of the analysis covers low
photon virtualities, 5 < Q^2 < 10 GeV^2, and medium to high values of inelasticity y, 0.35 < y < 0.8. The analysis is performed in the virtual photon-proton centre-of-mass system.
The charged particle production cross sections is investigated double-differentially as a function of pseudorapidity eta^* and transverse momentum p_T^* in the range
0 < eta^* < 3 and p_T^* < 10 GeV. The data are compared to different phenomenological models. |
| Links |
back to overview listing
H1 internal information
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K0s production at high Q2 at HERA II |
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Study of Multiple Interactions In photoproduction at HERA |
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K*+- production at low Q2 |
| Reference |
preliminiary ICHEP 2008, July 2008
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| Document | Conference paper or talk |
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| Contact | D. Sunar, E. de Wolf Analysis webpage |
| Abstract | First measurements of K*(892) vector mesons, observed through the
decay chain K*+- --> K0s pi+-, in neutral current deep-inelastic ep
scattering with the H1 detector are presented. The analysis is based
on data taken in the HERA-II running period. Inclusive cross sections
are presented as a function of the transverse momentum squared P_T*^2,
the rapidity y* and the centre-of-mass energy W of the hadronic final
state. The phase space of the events is restricted to 4 < Q2 < 100 GeV2,
0.1 < y < 0.6 and -1.5 < eta(K*) < 1.5. The results are compared to
predictions of leading order Monte Carlo models matched with parton
showers. |
| Links |
back to overview listing
H1 internal information
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Minijet Production in Deep Inelastic Scattering at HERA |
| Reference |
Sakar Osman, presented at DIS 2007, Spring 2007
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| Document | Conference paper or talk |
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| Contact | Sakar Osman, Leif Joensson |
| Abstract | The production of jets with low transverse momenta
(mini-jets) in deep inelastic electron-proton scattering
is studied. The analyses uses
data taken with the H1 detector at HERA during the years 1999 and 2000.
Mini-jet multiplicities are presented as a function of the transverse
momentum of the leading jet separately for two bins of the
pseudorapidity of the leading jet and for three
regions in the four momentum transfer squared
Q2. The analysis is performed separately for the inclusive
jet sample, and for a dijet sample, where the second jet is required to
have an azimuthal angle larger than 140 degrees with respect to the
leading jet. The dijet sample is split into two
samples which are enhanced in direct photon and resolved photon
processes, respectively. The results are compared to various
QCD based models. |
| Links |
back to overview listing
H1 internal information
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Azimuthal correlations in dijet events at low Q2 DIS |
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Heavy Flavour Physics |
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Search for D*p resonance at HERA II |
| Reference |
Preliminary result for DIS 2008 conferences, March 2008
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| Document | Conference paper or talk |
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| Contact | K. Krueger |
| Abstract | A possible resonance decaying into the D*-proton final state
is investigated in deep inelastic scattering at HERA. The data were taken with
the H1 detector in the years 2004 to 2007 and correspond to an integrated
luminosity of ~348 pb$^{-1}$ thus increasing the available data significantly
compared to the analysis of HERAI data. |
| Links |
back to overview listing
H1 internal information
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Study of Jet Shapes in Charm Photoproduction at HERA |
| Reference |
M. Martisikova, presented at DIS 2005, Spring 2005
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| Document | Conference paper or talk |
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| Contact | M. Martisikova |
| Abstract | Charm dijet events are investigated in the photoproduction kinematic range
in $ep$ collisions at HERA. The data were collected with the H1 Experiment
in the years 1999-2000 at a centre-of-mass energy of 318 GeV and correspond to an
integrated luminosity of 48 pb-1. One jet is tagged by a muon
as being initiated by a charm quark.
In order to shed light on the production mechanism of charm events in $ep$
collisions the shape of the other jet is studied
to distinguish if it is initiated by a quark or a gluon.
The jet shapes are measured as function of kinematic variables
such as the transverse momentum, energy and pseudorapidity of the
jet and the quantity x_\gamma^{obs}.
The shapes are found to be well described by the leading order
plus parton shower Monte Carlo simulation PYTHIA in the region of
large x_\gamma^{obs}, where according to the simulation
the jets are dominantly charm quark initiated.
Deviations between data and PYTHIA are observed
for small x_\gamma^{obs}, where resolved photon
events are expected to contribute significantly and more gluon jets are
expected.
No such deviations are observed in a dijet photoproduction
sample without muon requirements,
which is dominated by light quark production. |
| Links |
back to overview listing
H1 internal information
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The structure of Charm Jets in DIS |
| Reference |
A. Perieanu, presented at DIS 2005, Spring 2005
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| Document | Conference paper or talk |
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| Contact | A. Perieanu, J. Bracinik, G. Grindhammer |
| Abstract | The structure of charm jets in deep-inelastic scattering is studied with
the H1 detector at HERA using an integrated luminosity of 50 pb-1.
The event samples are in the phase space region 2 < Q^2 < 100 GeV^2 and
0.05 < y < 0.7. The charm events are tagged by a D*-meson required to have
a transverse momentum p_t,D* > 1.5 GeV and pseudorapidity |eta_D*| < 1.5.
Furthermore, the events are required to have at least one jet containing
the D*-meson (DstarJet). If there is a second jet (OtherJet) in the event,
it must have, like the DstarJet, p_t,jet > 1.5 GeV and |eta_jet| < 1.5.
The structure of the DstarJet and the OtherJet is investigated by
measuring the well-known jet shapes and subjet multiplicities as well as
the angular distribution of a specific subjet of the DstarJet and the
OtherJet with respect to its respective charm jet, defined to give a
correlation with a corresponding gluon at the parton level. The latter
distribution as well as the derived one of a characteristic angle
alpha_0 x E_jet as a function of E_jet is motivated by the suppression of
soft gluon radiation from heavy quarks, as expected from QCD ("dead cone effect"). In all
distributions differences between the DstarJet and the OtherJet are
observed. In general the data are found to be reasonably well described by
the QCD model for charm production as implemented in RAPGAP 2.8 and
JETSET 7.4. |
| Links |
back to overview listing
H1 internal information
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Acceptance corrected ratios of D^*p(3100) and D^* yields and differential cross sections of D^*p(3100) production |
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Last changed by
sschmitt at 15 Mar 2024, 10:36.
Inclusive Measurements and Fits