Reconstruction of Vees, Kinks, Ξ−'s, and  's in the FOCUS spectrometer

Link, J. M.; Reyes, M.; Yager, P. M.; Anjos, J. C.; Bediaga, I.; Göbel, C.; Magnin, J.; Massafferri, A.; Miranda, J. M. De; Pepe, I. M.; Reis, A. C. dos; Carrillo, S.; Casimiro, E.; Cuautle, E.; Sánchez-Hernández, A.; Uribe, C.; Vázquez, F.; Cinquini, L.; Cumalat, J. P.; O’Reilly, B.; Vargas, J. E. Ramirez; Vaandering, Eric Wayne; Butler, J. N.; Cheung, H. W. K.; Gaines, I.; Garbincius, P. H.; Garren, L.; Gottschalk, E.; Kasper, P.; Kreymer, A.; Kutschke, R.; Bianco, S.; Fabbri, F.; Sarwar, S.; Zallo, A.; Cawlfield, C.; Kim, D.Y.; Rahimi, A. M.; Wiss, J.; Gardner, R.; Kryemadhi, A.; Chung, Y. S.; Kang, J. S.; Ko, B. R.; Kwak, J. W.; Lee, K.B.; Park, H.; Alimonti, G.; Boschini, M.; D’Angelo, P.; DiCorato, M.; Dini, P.; Giammarchi, M.; Inzani, P.; Leveraro, F.; Malvezzi, S.; Menasce, D.; Mezzadri, M.; Milazzo, Lorenzo; Moroni, L.; Pedrini, D.; Pontoglio, C.; Prelz, F.; Rovere, M.; Sala, S.; Davenport, T. F.; Agostino, L.; Arena, Vincenzo; Boca, G.; Bonomi, G.; Gianini, G.; Liguori, G.; Merlo, M. M.; Pantea, D.; Ratti, S. P.; Riccardi, C.; Segoni, I.; Vitulo, P.; Hernandez, H.; López, A.; Méndez, H.; Cunqueiro, L.; Montiel, E.; Olaya, D.; Paris, A.; Quinones, J.; Rivera, C.; Xiong, W.; Zhang, Y.; Wilson, J. R.; Cho, K.; Handler, T.; Mitchell, R. E.; Engh, D.; Hosack, M.; Johns, W.; Nehring, M.; Sheldon, P.; Stenson, K.; Webster, M.; Sheaff, M.

doi:10.1016/s0168-9002(01)02065-4

Cited by 30 publications

(8 citation statements)

References 5 publications

(1 reference statement)

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“…The FOCUS detector is a large aperture, fixed-target spectrometer with excellent vertexing, particle identification [12], and reconstruction capabilities for photons, π 0 's, and K S [13]. A photon beam is derived from the bremsstrahlung of secondary electrons and positrons with an approximately 300 GeV endpoint energy produced from the 800 GeV Tevatron proton beam.…”

Section: Data Samplementioning

confidence: 99%

Observation of a 1750 MeV/c2 enhancement in the diffractive photoproduction of K+K−

Link¹,

Reyes²,

Yager³

et al. 2002

Physics Letters B

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Section: Data Samplementioning

confidence: 99%

Observation of a 1750 MeV/c2 enhancement in the diffractive photoproduction of K+K−

Link¹,

Reyes²,

Yager³

et al. 2002

Physics Letters B

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“…These detectors provide excellent separation of the production and decay vertices. Further downstream, charged particles are tracked and momentum analyzed by a system of five multiwire proportional chambers [8] and two dipole magnets with opposite polarity. Three multicell threshold Čerenkov detectors are used to discriminate among electrons, pions, kaons, and protons [9].…”

Section: Combining Genetic Programming With High Energy Physics Datamentioning

confidence: 99%

“…Vertexing Variables: The vertexing and tracking variables are mostly those used in traditional analyses [6]: ℓ/σ ℓ , isolation cuts, vertex CLs and isolations, etc. The tracking χ 2 variables which are calculated by the wire chamber tracking code [8] are not generally used in analyses. The vertexing and tracking variables are shown in Table 3.…”

Section: Maximum Of Two Values Min Minimum Of Two Valuesmentioning

confidence: 99%

Application of genetic programming to high energy physics event selection

Link¹,

Yager²,

Anjos³

et al. 2005

Nuclear Instruments and Methods in Physics Research Section A:

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We review genetic programming principles, their application to FOCUS data samples, and use the method to study the doubly Cabibbo suppressed decay D + → K + π + π − relative to its Cabibbo favored counterpart, D + → K − π + π + . We find that this technique is able to improve upon more traditional analysis methods. To our knowledge, this is the first application of the genetic programming technique to High Energy Physics data.

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“…K 0 S 's are reconstructed using the "one-bend" approximation described in Ref. [24]. Photons and π 0 are reconstructed using two electromagnetic calorimeters covering different regions of rapidity.…”

Section: The Spectrometermentioning

confidence: 99%

Search for CPT Violation with the FOCUS Experiment and Measurement of Λ<sub>b</sub> lifetime in the decay Λ<sub>b</sub> → J / Ψ Lambda with the D0 Experiment

Kryemadhi¹

2004

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This dissertation describes two different projects from two different experiments. We have performed a search for CPT violation in neutral charm meson oscillations using data from the FOCUS Experiment. While flavor mixing in the charm sector is predicted to be small in the Standard Model, it is still possible to investigate CPT violation through a study of the proper time dependence of a CPT asymmetry in right-sign decay rates for D 0 → K − π + and D0 → K + π − . This asymmetry is related to the CPT violating complex parameter ξ and the mixing parameters x and y: A CP T ∝ Re ξ y − Im ξ x. We determine a 95% confidence level limit of −0.0068 < Re ξ y − Im ξ x < 0.0234. Within the framework of the Standard Model Extension incorporating general CPT violation, we also find 95% confidence level limits for the expressions involving coefficients of Lorentz violation of (−2.8 < N (x, y, δ)(∆a 0 + 0.6 ∆a Z ) < 4.8) × 10 −16 GeV, (−7.0 < N (x, y, δ)∆a X < 3.8) × 10 −16 GeV, and (−7.0 < N (x, y, δ)∆a Y < 3.8) × 10 −16 GeV, where N (x, y, δ) is a normalization factor that incorporates mixing parameters x, y and the doubly Cabibbo suppressed to Cabibbo favored relative strong phase δ.We also present measurements of the Λ 0 b lifetime in the exclusive decay channel Λ 0 b → J/ψΛ with J/ψ → µ + µ − and Λ → pπ − , the B 0 lifetime in the decay B 0 d → J/ψK 0 S with J/ψ → µ + µ − and K 0 S → π + π − , and the ratio of these lifetimes. The analysis is based on approximately 225 pb −1 of data recorded with the DØ detector in pp collisions at √ s = 1.96 TeV.The Λ 0 b lifetime is determined to be τ (Λ 0 b ) = 1.36 ± 0.30 (stat) ± 0.07(syst) ps, the B 0 lifetime τ (B d ) = 1.43 ± 0.12 (stat) ± 0.04 (syst) ps, and the ratio τ (Λ b ) τ (B d ) = 0.95 ± 0.22 ± 0.05. viiIn contrast with previous measurements using semileptonic decays, this is the first determination of the Λ 0 b lifetime based on a fully reconstructed decay channel.viii

show abstract

Reconstruction of Vees, Kinks, Ξ−'s, and 's in the FOCUS spectrometer

Cited by 30 publications

References 5 publications

Observation of a 1750 MeV/c2 enhancement in the diffractive photoproduction of K+K−

Observation of a 1750 MeV/c2 enhancement in the diffractive photoproduction of K+K−

Application of genetic programming to high energy physics event selection

Search for CPT Violation with the FOCUS Experiment and Measurement of Λ<sub>b</sub> lifetime in the decay Λ<sub>b</sub> → J / Ψ Lambda with the D0 Experiment

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