scholarly journals Double Helicity Asymmetries of Forward Neutral Pions from s = 510 GeV pp Collisions at STAR

2016 ◽  
Vol 40 ◽  
pp. 1660024
Author(s):  
Christopher J. Dilks
Keyword(s):  
Electromagnetic Calorimeter ◽  
Beam Polarization ◽  
Gluon Polarization ◽  
Pp Collisions ◽  
Forward Region ◽  
Neutral Pions ◽  
Pseudorapidity Range ◽  
Integrated Luminosity

Longitudinally polarized [Formula: see text] scattering experiments provide access to gluon polarization via measurement of the double helicity asymmetry, [Formula: see text]. At the completion of the 2013 RHIC running period, a significant dataset of [Formula: see text]s corresponding to an integrated luminosity of 46 [Formula: see text] (2012) and 8 [Formula: see text] (2013) produced from polarized [Formula: see text] scattering at [Formula: see text] GeV with an average beam polarization of approximately [Formula: see text] was acquired. The [Formula: see text] kinematics were measured via isolation cones by the STAR Forward Meson Spectrometer, an electromagnetic calorimeter covering a forward pseudorapidity range of [Formula: see text]. The asymmetric [Formula: see text] subprocess becomes more dominant in this forward region than in the midrapidity region; furthermore, asymmetry measurements in the forward region are sensitive to low-[Formula: see text] gluons. Progress on [Formula: see text] determined from forward [Formula: see text] events, complementing previous midrapidity measurements, are presented.

scholarly journals Alternative digital filltering scheme for LumiCal read-out

2019 ◽  
Vol 201 ◽  
pp. 04004
Author(s):  
Evgenii Lutsenko
Keyword(s):  
Signal Processing ◽  
Electromagnetic Calorimeter ◽  
Beam Test ◽  
Forward Region ◽  
Test Beam ◽  
Test Conditions ◽  
Electron Positron

The LumiCal electromagnetic calorimeter is designed for the forward region of future electron-positron colliders, such as CLIC and ILC. It is intended to improve hermeticity of detectors by detecting electrons, positrons, and photons at small angles. Currently, the detector prototypes are studied in the beam test conditions. An important part of the signal processing is the digital filltering implemented in the read-out electronics, influencing the precision and quality of gathered data. In this article two schemes of digital filltering of gathered signal from test beam for the LumiCal detector prototype are presented.

scholarly journals Large Rapidity Gap Method to Select Soft Diffraction Dissociation at the LHC

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Emily Nurse ◽  
Sercan Sen
Keyword(s):  
Hadron Collider ◽  
Pp Collisions ◽  
Forward Region ◽  
Diffraction Dissociation ◽  
Proton Proton ◽  
Diffractive Dissociation ◽  
Diffractive Process ◽  
Quantum Numbers ◽  
Rapidity Gap ◽  
Zero Degree

In proton-proton (pp) collisions, any process involves exchanging the vacuum quantum numbers is known as diffractive process. A diffractive process with no largeQ2is called soft diffractive process. The diffractive processes are important for understanding nonperturbative QCD effects and they also constitute a significant fraction of the total pp cross section. The diffractive events are typically characterized by a region of the detector without particles, known as a rapidity gap. In order to observe diffractive events in this way, we consider the pseudorapidity acceptance in the forward region of the ATLAS and CMS detectors at the Large Hadron Collider (LHC) and discuss the methods to select soft diffractive dissociation for pp collisions ats=7 TeV. It is shown that, in the limited detector rapidity acceptance, it is possible to select diffractive dissociation events by requiring a rapidity gap in the event; however, without using forward detectors, it seems not possible to fully separate single and double diffractive dissociation events. The Zero Degree Calorimeters can be used to distinguish the type of the diffractive processes up to a certain extent.

The calibration of an LHCb electromagnetic calorimeter by recovering the invariant mass of neutral pions

2013 ◽  
Vol 68 (5) ◽  
pp. 360-366
Author(s):  
I. M. Belyaev ◽  
D. Yu. Golubkov ◽  
V. Yu. Egorychev ◽  
D. V. Savrina
Keyword(s):  
Invariant Mass ◽  
Electromagnetic Calorimeter ◽  
Neutral Pions

scholarly journals Recent CMS B physics results

2018 ◽  
Vol 182 ◽  
pp. 02098
Author(s):  
Sergey Polikarpov
Keyword(s):  
Pair Production ◽  
B Physics ◽  
Rare Decay ◽  
Pp Collisions ◽  
Cms Experiment ◽  
Angular Analysis ◽  
8 Tev ◽  
Using Data ◽  
Integrated Luminosity

Various recent CMS B physics results are reported, including measurement of B hadron lifetimes; observation of Υ(1S) pair production; angular analysis of the rare decay B0 → K*0μ+μ-; search for X(5568) state. All analyses are performed using data collected by the CMS experiment at the LHC in pp collisions at √s = 8 TeV, which corresponds to an integrated luminosity of about 20 fb-1.

scholarly journals Measurement of J/Ψ production as a function of multiplicity in pp and p-Pb collisions with ALICE

2018 ◽  
Vol 182 ◽  
pp. 02064 ◽  
Author(s):  
Anisa Khatun ◽  
Keyword(s):  
Charged Particle ◽  
Theoretical Model ◽  
Electromagnetic Calorimeter ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Pp Collisions ◽  
Proton Proton ◽  
Model Predictions

The increase of hard probe production as a function of the charged particle multiplicity in proton-proton and proton-lead collisions is considered to be an interesting observable for the study of multiple parton interactions. In the present work, the correlation between J/Ψ production and charged particle multiplicity has been reviewed in pp collisions at √s = 7 and 13 TeV and p-Pb collisions at √sNN = 5.02 TeV at mid- and forward rapidities. The J/√ measurement in pp collisions at √s = 13 TeV using events triggered by the ALICE electromagnetic calorimeter at midrapidity is discussed in this report, too. An increment of the relative J/Ψ yields has been observed as a function of the multiplicity. The results have also been compared to theoretical model predictions.

DESCRIPTION OF THE BTEV DETECTOR

2001 ◽  
Vol 16 (supp01c) ◽  
pp. 1062-1064 ◽  
Author(s):  
JIANCHUN WANG
Keyword(s):  
Cp Violation ◽  
Rare Decays ◽  
Electromagnetic Calorimeter ◽  
Forward Region ◽  
Muon System ◽  
Region 10 ◽  
Individual Detector

BTeV is an experiment being constructed at the Fermilab [Formula: see text] collider, designed to study mixing, CP violation, and rare decays of beauty and charm hadrons. The detector covers the forward region (10-300 mrad), components include silicon pixels, tracking, RICH, PdWO4 electromagnetic calorimeter, and muon system. Brief description of individual detector elements are presented.

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