71,314 research outputs found
Muon capture for the front end of a muon collider
We discuss the design of the muon capture front end for a \mu+-\mu- Collider.
In the front end, a proton bunch on a target creates secondary pions that drift
into a capture transport channel, decaying into muons. A sequence of rf
cavities forms the resulting muon beams into strings of bunches of differing
energies, aligns the bunches to (nearly) equal central energies, and initiates
ionization cooling. The muons are then cooled and accelerated to high energy
into a storage ring for high-energy high luminosity collisions. Our initial
design is based on the somewhat similar front end of the International Design
Study (IDS) neutrino factory.Comment: 3 pp. Particle Accelerator, 24th Conference (PAC'11) 28 Mar - 1 Apr
2011: New York, US
Reconstruction of Cosmic and Beam-Halo Muons with the CMS Detector
The powerful muon and tracker systems of the CMS detector together with
dedicated reconstruction software allow precise and efficient measurement of
muon tracks originating from proton-proton collisions. The standard muon
reconstruction algorithms, however, are inadequate to deal with muons that do
not originate from collisions. We present the design, implementation, and
performance of a dedicated cosmic muon track reconstruction algorithm, which
features pattern recognition optimized for muons that are not coming from the
interaction point, i.e. cosmic muons and beam-halo muons. To evaluate the
performance of the new algorithm, data taken during Cosmic Challenge phases I
and II as well as beam-halo muons recorded during the first LHC beam operation
were studied. In addition, a variety of more general topologies of cosmic muons
and beam-halo muons were studied using simulated data to demonstrate some key
features of the new algorithm.Comment: Poster at ICHEP08, Philadelphia, USA, July 2008. 5 pages, 3 figure
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Measurement of Azimuthal Anisotropy of Muons from Charm and Bottom Hadrons in pp Collisions at sqrt[s]=13 TeV with the ATLAS Detector.
The elliptic flow of muons from the decay of charm and bottom hadrons is measured in pp collisions at sqrt[s]=13 TeV using a data sample with an integrated luminosity of 150 pb^{-1} recorded by the ATLAS detector at the LHC. The muons from heavy-flavor decay are separated from light-hadron decay muons using momentum imbalance between the tracking and muon spectrometers. The heavy-flavor decay muons are further separated into those from charm decay and those from bottom decay using the distance-of-closest-approach to the collision vertex. The measurement is performed for muons in the transverse momentum range 4-7 GeV and pseudorapidity range |η|<2.4. A significant nonzero elliptic anisotropy coefficient v_{2} is observed for muons from charm decays, while the v_{2} value for muons from bottom decays is consistent with zero within uncertainties
Atmospheric Muons Measured with IceCube
IceCube is a cubic-kilometer Cherenkov detector in the deep ice at the
geographic South Pole. The dominant event yield is produced by penetrating
atmospheric muons with energies above several 100 GeV. Due to its large
detector volume, IceCube provides unique opportunities to study atmospheric
muons with large statistics in detail. Measurements of the energy spectrum and
the lateral separation distribution of muons offer insights into hadronic
interactions during the air shower development and can be used to test hadronic
models.
We will present an overview of various measurements of atmospheric muons in
IceCube, including the energy spectrum of muons between 10 TeV and 1 PeV. This
is used to derive an estimate of the prompt contribution of muons, originating
from the decay of heavy (mainly charmed) hadrons and unflavored mesons. We will
also present measurements of the lateral separation distributions of TeV muons
between 150 m and 450 m for several initial cosmic ray energies between 1 PeV
and 16 PeV. Finally, the angular distribution of atmospheric muons in IceCube
will be discussed.Comment: 4 pages, 5 figures; Proceedings of the International Symposium on
Very High Energy Cosmic Ray Interactions (ISVHECRI 2018), to appear in EPJ
Web of Conference
Detection of Near Horizontal Muons with the HAWC Observatory
The HAWC (High Altitude Water Cherenkov) gamma ray observatory is able to
observe muons with nearly horizontal trajectories. HAWC is located at an
altitude of 4100 meters a.s.l. on the Sierra Negra volcano in Mexico. The HAWC
detector is composed of 300 water tanks, each 7.3 m in diameter and 4.5 m tall,
densely packed over a physical area of 22,000 m. Previous and current
experiments have observed high zenith angle (near horizontal) muons at or near
sea level. HAWC operates as a hodoscope able to observe multi-TeV muons at
zenith angles greater than 75 degrees. This is the first experiment to measure
near horizontal muons at high altitude and with large ( 10 m) separations
for multiple muons. These muons are distinguishable from extensive air showers
by observing near horizontal particles propagating with the speed of light. The
proximity of Sierra Negra and Pico de Orizaba volcanoes provides an additional
measurement of muons with rock overburdens of several km water equivalent. We
will present the angular distribution and rate at which HAWC observes these
muon eventsComment: Presented at the 35th International Cosmic Ray Conference (ICRC2017),
Bexco, Busan, Korea. See arXiv:1708.02572 for all HAWC contribution
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