Novel method of measuring electron positron colliding beam parameters

Cinabro, D.; Korbiak, Katherine; Ehrlich, R.; Henderson, S.; Mistry, N. B.

doi:10.1016/s0168-9002(01)01330-4

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…The pp phase space and luminous region at IP1 is studied by following and adapting a methodology developed at CESR [158], the Tevatron [159] and PEP-II [160].…”

Section: Interaction Regionmentioning

confidence: 99%

Measurement of Hadronic Event Shapes and Jet Substructure in Proton-Proton Collisions at 7.0 TeV Center-of-Mass Energy with the ATLAS Detector at the Large Hadron Collider

Miller¹

2012

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This thesis presents the first measurement of 6 hadronic event shapes in proton-proton collisions at a center-of-mass energy of √ s = 7 TeV using the ATLAS detector at the Large Hadron Collider. Results are presented at the particle-level, permitting comparisons to multiple Monte Carlo event generator tools. Numerous tools and techniques that enable detailed analysis of the hadronic final state at high luminosity are described. The approaches presented utilize the dual strengths of the ATLAS calorimeter and tracking systems to provide high resolution and robust measurements of the hadronic jets that constitute both a background and a signal throughout AT-LAS physics analyses. The study of the hadronic final state is then extended to jet substructure, where the energy flow and topology within individual jets is studied at the detector level and techniques for estimating systematic uncertainties for such measurements are commissioned in the first data. These first substructure measurements in ATLAS include the jet mass and sub-jet multiplicity as well as those concerned with multi-body hadronic decays and color flow within jets. Finally, the first boosted hadronic object observed at the LHC -the decay of the top quark to a single jet -is presented. PrefaceThe Large Hadron Collider (LHC) is the largest machine ever built by humankind and is designed to accelerate protons to the highest energies ever produced on Earth.This fact alone merits respect and awe of the infinite creativity and willingness of humans to believe that they can achieve the impossible in order to understand the unknowable. The possibility to study the properties of the interactions that such a machine produces is truly a once in a lifetime opportunity.The work constituted by this thesis represents an endeavor to understand the way that quarks and gluons -the partons that were at one time only a theoretical "convenience" for Richard Feynman, Murray Gell-Mann and George Zweig -evolve to form experimental signatures in our detectors, the jets of the so-called hadronic final state. But the LHC is a unique machine, producing a complex environment in which these signatures are manifested. As a result, techniques must be developed to tease out the interesting physics buried within a complex milieu created by the enormous energy and intensity of the LHC. This thesis is at least in part devoted to describing those tools, some of which have since come to be used in analyses measuring the top quark, the W boson, and searches for new physics throughout ATLAS.An attempt is made to draw a connection among the many studies performed throughout the initial phases of the ATLAS experiment. Critical efforts during the commissioning of the detector, the first acquisition of √ s = 900 GeV and then √ s = 7 TeV data, and the full-fledged analysis of the full 2010 dataset, are all tied together by a common thread: the ability to utilize the largest and most advance instruments ever built in a coherent manner to understand the highest energy collisions of the sm...

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“…The pp phase space and luminous region at IP1 is studied by following and adapting a methodology developed at CESR [158], the Tevatron [159] and PEP-II [160].…”

Section: Interaction Regionmentioning

confidence: 99%

Measurement of Hadronic Event Shapes and Jet Substructure in Proton-Proton Collisions at 7.0 TeV Center-of-Mass Energy with the ATLAS Detector at the Large Hadron Collider

Miller¹

2012

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“…Correlations for the low-mass fit were given in Table 4.7.3. Using the CLEO detector, Cinabro et al pioneered a technique to measure the distribution of event vertices at the CESR e + e − collider, and extract various parameters of the accelerator beams [61]. A similar approach was used at the Tevatron [62].…”

Section: Chapter 4 Measurement Of Cp Violation Inmentioning

confidence: 99%

Measurement of CP-Violating Asymmetries In Neutral B Meson Decays Into Three Kaons

Thompson

2008

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The Standard Model (SM) of particle physics successfully describes all of the observed interactions of the fundamental particles (with the exception of non-zero neutrino mass). Despite this enormous success, the SM is widely viewed as an incomplete theory. For example, the size of the asymmetry between matter and antimatter is not nearly large enough to account for the abundance of matter observed throughout the universe. It is thus believed that as-yet-unknown physical phenomena must exist that introduce new asymmetries between matter and antimatter. In this thesis, by studying decays that happen only rarely in the SM, we make measurements of asymmetries between matter and antimatter that are potentially sensitive to the existence of processes beyond the SM.At the PEP-II asymmetric-energy B Factory at SLAC, electrons and positrons are collided at the Υ (4S) resonance to create pairs of B mesons. The BABAR detector is used to measure the subsequent decay products. Using 383 million Υ (4S) → BB decays, we study the decay Data samples reconstructed from three K 0 modes (Kand K −0.031 rad, excluding the possibility that β eff = 0 at 5.1σ. We use the data with m K + K − < 1.1 GeV/c 2 to extract CP asymmetries separately for B 0 decays to φ(1020)K 0 and f 0 (980)K 0 , finding β eff ,φ = 0.11 ± 0.14 ± 0.06 and β eff ,f 0 = 0.14 ± 0.15 ± 0.05.vi

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“…We choose an ensemble of tracks that pass through the box at a small angle, as these are most useful for making a measurement. We have previously used this technique to measure ¬ £ Ý and observe the hourglass effect at the CESR-CLEO interaction point [2].…”

Section: Methodsmentioning

confidence: 99%

“…Here we present a method that relies on the tracking system of a high energy physics experiment, CLEO. Two recent results [1] [2] have shown the resolution of the CLEO tracking system to be small and well modeled by simulation. The basic technique is to select · · events, measure the total momentum of the two observed tracks, and unfold from this the contribution from the momentum resolution of the tracking system and the underlying difference caused by the angular spread of the beam particles.…”

Section: Introductionmentioning

confidence: 99%

“…The basic technique is to select · · events, measure the total momentum of the two observed tracks, and unfold from this the contribution from the momentum resolution of the tracking system and the underlying difference caused by the angular spread of the beam particles. Combining the angular spread of the beam with the spatial spread of the beam, measured with our box method [2], we can simultaneously extract ¬ £ Ü , the horizontal beta function at the CESR-CLEO collision point, ¬ £ Ý , the vertical beta function at the CESR-CLEO collision point,¯Ü, the horizontal emittance, and¯Ý, the vertical emittance. By considering the data as a function of specific luminosity we can search for dynamic changes of emittance.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of CESR emittance and search for dynamic effects

Cinabro

Korbiak

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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We have developed techniques that allow simultaneous measurements of the spatial size of the luminous region and the angular spread of the · · events from the CLEO interaction point of the Cornell ElectronPositron Storage Ring, CESR. These techniques take advantage of the small and well understood resolution of the CLEO tracking system. We use these measurements to extract the horizontal beta, horizontal emittance and the vertical emittance as functions of specific luminosity.

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Novel method of measuring electron positron colliding beam parameters

Cited by 6 publications

References 5 publications

Measurement of Hadronic Event Shapes and Jet Substructure in Proton-Proton Collisions at 7.0 TeV Center-of-Mass Energy with the ATLAS Detector at the Large Hadron Collider

Measurement of Hadronic Event Shapes and Jet Substructure in Proton-Proton Collisions at 7.0 TeV Center-of-Mass Energy with the ATLAS Detector at the Large Hadron Collider

Measurement of CP-Violating Asymmetries In Neutral B Meson Decays Into Three Kaons

Measurement of CESR emittance and search for dynamic effects

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