New data on the production of charged kaons in p+p interactions are presented. The data come from a sample of 4.8 million inelastic events obtained with the NA49 detector at the CERN SPS at 158 GeV/c ...beam momentum. The kaons are identified by energy loss in a large TPC tracking system. Inclusive invariant cross sections are obtained in intervals from 0 to 1.7 GeV/c in transverse momentum and from 0 to 0.5 in Feynman x. Using these data as a reference, a new evaluation of the energy dependence of kaon production, including neutral kaons, is conducted over a range from 3 GeV to
collider energies.
The Large Hadron–Electron Collider at the HL-LHC Aksakal, H; Alekhin, S; Allport, P P ...
Journal of physics. G, Nuclear and particle physics,
11/2021, Letnik:
48, Številka:
11
Journal Article
New data on the production of protons, anti-protons and neutrons in p+p interactions are presented. The data come from a sample of 4.8 million inelastic events obtained with the NA49 detector at the ...CERN SPS at 158 GeV/c beam momentum. The charged baryons are identified by energy loss measurement in a large TPC tracking system. Neutrons are detected in a forward hadronic calorimeter. Inclusive invariant cross sections are obtained in intervals from 0 to 1.9 GeV/c (0 to 1.5 GeV/c) in transverse momentum and from −0.05 to 0.95 (−0.05 to 0.4) in Feynman
x
for protons (anti-protons), respectively.
p
T
integrated neutron cross sections are given in the interval from 0.1 to 0.9 in Feynman
x
. The data are compared to a wide sample of existing results in the SPS and ISR energy ranges as well as to proton and neutron measurements from HERA and RHIC.
A
BSTRACT
Inclusive
e
±
p
single and double differential cross sections for neutral and charged current deep inelastic scattering processes are measured with the H1 detector at HERA. The data were ...taken at a centre-of-mass energy of
$ \sqrt {s} = {319} $
GeV with a total integrated luminosity of 333.7 pb
−1
shared between two lepton beam charges and two longitudinal lepton polarisation modes. The differential cross sections are measured in the range of negative four-momentum transfer squared,
Q
2
, between 60 and 50 000 GeV
2
, and Bjorken
x
between 0
.
0008 and 0
.
65. The measurements are combined with earlier published unpolarised H1 data to improve statistical precision and used to determine the structure function
$ xF_{3}^{{\gamma Z}} $
. Ameasurementoftheneutralcurrentparityviolating structure function
$ F_{2}^{{\gamma Z}} $
is presented for the first time. The polarisation dependence of the charged current total cross section is also measured. The new measurements are well described by a next-to-leading order QCD fit based on all published H1 inclusive cross section data which are used to extract the parton distribution functions of the proton.
Inclusive production of D super() mesons in deep-inelastic ep scattering at HERA is studied in the range 5<Q super(2)<100 GeV super(2) of the photon virtuality and 0.02<y<0.7 of the inelasticity of ...the scattering process. The observed phase space for the D super() meson is p sub( )TD super())>1.25 GeV and | eta (D super())|<1.8. The data sample corresponds to an integrated luminosity of 348 pb super(-1) collected with the H1 detector. Single and double differential cross sections are measured and the charm contribution ${F_{2}c\bar{c}}}$ to the proton structure function F sub(2) is determined. The results are compared to perturbative QCD predictions at next-to-leading order implementing different schemes for the charm mass treatment and with Monte Carlo models based on leading order matrix elements with parton showers.
A measurement is presented of the inclusive neutral current e super( plus or minus ) p scattering cross section using data collected by the H1 experiment at HERA during the years 2003 to 2007 with ...proton beam energies E sub( )pof 920, 575, and 460 GeV. The kinematic range of the measurement covers low absolute four-momentum transfers squared, 1.5 GeV super(2)<Q super(2)<120 GeV super(2), small values of Bjorken x, 2.910 super(-5)<x <0.01, and extends to high inelasticity up to y=0.85. The structure function F sub( )Lis measured by combining the new results with previously published H1 data at E sub( )p920 GeV and E sub( )p820 GeV. The new measurements are used to test several phenomenological and QCD models applicable in this low Q super(2) and low x kinematic domain.
The Liquid Argon Jet Trigger of the H1 Experiment at HERA Olivier, B.; Dubak-Behrendt, A.; Kiesling, C. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2010, Letnik:
à paraître
Journal Article
Recenzirano
Odprti dostop
We report on a novel trigger for the liquid argon calorimeter which was installed in the H1 Experiment at HERA.This trigger, called the “Jet Trigger”, was running at level 1 and implemented a ...real-time cluster algorithm. Within only 800 ns, the Jet Trigger algorithm found local energy maxima in the calorimeter, summed their immediate neighbors, sorted the resulting jets by energy, and applied topological conditions for the final level 1 trigger decision. The Jet Trigger was in operation from the year 2006 until the end of the HERA running in the summer of 2007. With the Jet Trigger it was possible to substantially reduce the thresholds for triggering on electronsand jets, giving access to a largely extended phase space for physical observables which could not have been reached in H1 before. The concepts of the Jet Trigger may be an interesting upgrade option for the LHC experiments.
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