A high-resolution cylindrical drift chamber for the KEK B-factory

Hirano, Hiroyuki; Akatsu, M.; Fujita, Y.; Fujimoto, K.; Hirose, Masashi; Inami, K.; Ishikawa, A.; Iwasaki, Y.; Joo, K. K.; Kuniya, T.; Matsumoto, Toshio; Nagai, I.; Nitoh, O.; Ohnishi, Y.; Ohshima, T.; Okabe, T.; Ozaki, H.; Sakai, Y.; Sugi, A.; Sugiyama, A.; Suzuki, Jun–ichi; Suzuki, S.; Tan, Nusret; Tanaka, J.; Tomoto, M.; Trabelsi, K.; Ujiie, N.; Uno, S.; Yoshida, Kohei

doi:10.1016/s0168-9002(00)00513-1

Cited by 31 publications

(9 citation statements)

References 13 publications

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“…Depending on the detector and the environment, measurements of dE/dx can be affected by a large variety of sizable systematic effects, including aging, and thus development of a dE/dx calibration technique that can reliably predict the dE/dx mean value and resolution for a particle of a given type anywhere in the detector can be a great challenge, particularly when one wishes to exploit for PID the dE/dx ''relativistic rise'' in a gaseous tracking system. Examples of dE/dx use in PID include the drift chambers in BaBar [207,234], Belle [235], BESII [211], CDF [236], CLEO-II [203], CLEO-III and CLEO-c [205], and KLOE [237]. In BaBar and Belle, dE/dx K /π separation at low momenta is very important to B flavor tagging, and in CDF the dE/dx ''relativistic rise'' is critically important to the study of B 0 , B s ,…”

Section: Charged Particle Identificationmentioning

confidence: 99%

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Flavor physics in the quark sector

et al. 2010

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In the past decade, one of the major challenges of particle physics has been to gain an in-depth understanding of the role of quark flavor. In this time frame, measurements and the theoretical interpretation of their results have advanced tremendously. A much broader understanding of flavor particles has been achieved; apart from their masses and quantum numbers, there now exist detailed measurements of the characteristics of their interactions allowing stringent tests of Standard Model predictions. Among the most interesting phenomena of flavor physics is the violation of the CP symmetry that has been subtle and difficult to explore. In the past, observations of CP violation were confined to neutral K mesons, but since the early 1990s, a large number of CP-violating processes have been studied in detail in neutral B mesons. In parallel, measurements of the couplings of the heavy quarks and the dynamics for their decays in large samples of K, D, and B mesons have been greatly improved in accuracy and the results are being used as probes in the search for deviations from the Standard Model. In the near future, there will be a transition from the current to a new generation of experiments; thus a review of the status of quark flavor physics is timely. This report is the result of the work of physicists attending the 5th CKM workshop, hosted by the University of Rome "La Sapienza", September 9-13, 2008. It summarizes the results of the current generation of experiments that are about to be completed and it confronts these results with the theoretical understanding of the field which has greatly improved in the past decade. (C) 2010 Elsevier B.V. All rights reserved

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Section: Charged Particle Identificationmentioning

confidence: 99%

“…(235) and (237) hold for vanishing lepton mass, and there are corrections analogous to those in Eq. (203).…”

Section: B → Dmentioning

confidence: 99%

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Flavor physics in the quark sector

et al. 2010

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“…In order to reduce the amount of material along the positron trajectory, the helium-based gas mixture He:C 2 H 6 = 50:50 is adopted as a counting gas [20,21]. For this mixture the disadvantages of small primary ionisation and large diffusion of helium is balanced by the high primary ionisation, good quenching properties and high voltage (HV) stability of ethane.…”

Section: Counting Gasmentioning

confidence: 99%

The MEG detector for μ +→e+ γ decay search

et al. 2013

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The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 to search for the decay μ + → e + γ by using one of the most intense continuous μ + beams in the world. This paper presents the MEG components: the positron spectrometer, including a thin target, a superconducting magnet, a set of drift chambers for measuring the muon decay vertex and the positron momentum, a timing counter for measuring the positron time, and a liquid xenon detector for measuring the photon energy, position and time. The trigger system, the read-out electronics and the data acquisition system are also presented in detail. The paper is completed with a description of the equipment and techniques developed for the calibration in time and energy and the simulation of the whole apparatus.

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“…The parameterization of the X-T relation is the first step in the calibration procedure. In the Belle experiment, the X-T relation of the Central Drift Chamber (CDC) is fitted with up to fifth-order polynomials [6]; the KLOE drift chamber uses up to fifth-order Chebychev polynomials [7]. Since the BESIII chamber has a similar cell geometry to that of the Belle CDC, we tried to use the same fitting function.…”

Section: Cell Geometry and The Parameterization Of The X-t Relationmentioning

confidence: 99%

Study of the calibration of X-T relation for the BESIII drift chamber

Kang,

Wu,

et al. 2014

Preprint

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This paper introduces the calibration of the time-to-distance relation for the BESIII drift chamber. The parameterization of the time-to-distance relation is presented. The studies of left-right asymmetry and the variation with the entrance angle are performed. The impact of dead channels on the time-to-distance relation is given special attention in order to reduce the shifts of the measured momenta for the tracks passing near dead cells. Finally we present the spatial resolution (123 µm) for barrel Bhabha events (| cos θ| < 0.8) from J/ψ data taken in 2012.

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A high-resolution cylindrical drift chamber for the KEK B-factory

Cited by 31 publications

References 13 publications

Flavor physics in the quark sector

Flavor physics in the quark sector

The MEG detector for μ +→e+ γ decay search

Study of the calibration of X-T relation for the BESIII drift chamber

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