Author: Matthew S. Nehring
Publisher:
ISBN:
Category : Lepton-hadron interactions
Languages : en
Pages : 306
Book Description
Measurements of the Neutral Charmed Meson Semileptonic Decays D0--K−eve[subscript] and D0--[pi]−e+ve[subscript]
Author: Matthew S. Nehring
Publisher:
ISBN:
Category : Lepton-hadron interactions
Languages : en
Pages : 306
Book Description
Publisher:
ISBN:
Category : Lepton-hadron interactions
Languages : en
Pages : 306
Book Description
Measurements of the Semileptonic Decay of the Neutral Charmed Meson D0--K[̄mu]+[nu][subscript Mu]
Author: Will E. Johns
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 376
Book Description
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 376
Book Description
Semileptonic decays of charmed D... meson
Author: Max-Planck-Institut für Physik und Astrophysik München
Publisher:
ISBN:
Category :
Languages : de
Pages : 18
Book Description
Publisher:
ISBN:
Category :
Languages : de
Pages : 18
Book Description
ספר אמרי מרדכי
Analysis of the Semileptonic Decay D0 --] Anti-K0 Pi- Mu+ Nu
Author: Ilaria Maria Lucia Segoni
Publisher:
ISBN:
Category :
Languages : en
Pages : 175
Book Description
This thesis describes the analysis of the semileptonic decay D{sup 0} {yields} {bar K}{sup 0} {pi}{sup -} {mu}{sup +}{nu} using FOCUS data. FOCUS is a fixed target experiment at Fermilab that studies the physics of the charm quark. Particles containing charm are produced by photon-gluon fusion from the collision of a photon beam on a BeO target. The experiment is characterized by excellent vertex resolution and particle identification. The spectrometer consists of three systems for track reconstruction (two silicon systems and one multiwire proportional chamber system) and two magnets of opposite polarity. The polarity of the magnet is such that the events of e{sup +}e{sup -} pairs produced in the target (which constitutes the main background) travel through a central opening in the detectors without interactions. Particle momentum is measured from the deflection angle in the magnets. Three multicell Cerenkov counters are used for charged particle identification (for e, {pi}, K, and p). Two different tracking systems located after several interaction lengths of shielding material are used for muon identification. The energy of neutral pions and electrons is measured in two electromagnetic calorimeters, while an hadron calorimeter is used for measuring the neutron energy. During the last four years the FOCUS collaboration provided results on several charm topics: CP violation, D{sup 0}-{bar D}{sup 0} mixing, rare and forbidden decays, precision measurements of semileptonic decays, baryon and meson lifetimes, fully hadronic baryon and meson branching ratios, charm spectroscopy, Dalitz analyses of resonant structures, charm anti-charm production, QCD studies involving double charm particles, and pentaquarks. Semileptonic decays, besides having a clear signature for experiments, provide crucial information for theoretical studies. These decays carry information on the weak coupling of quarks since they can be used for measuring Cabibbo-Kobayashi-Maskawa matrix elements. Although the decay occurs through weak interaction, QCD effects due to quark confinement affect the decay amplitude. These effects can be included through the form factors, which are predicted by different theoretical approaches (quark models, lattice QCD, and sum rules). Experiments can measure form factor ratios, and from the comparison with theory they provide guidance for building a successful theory to describe hadrons.
Publisher:
ISBN:
Category :
Languages : en
Pages : 175
Book Description
This thesis describes the analysis of the semileptonic decay D{sup 0} {yields} {bar K}{sup 0} {pi}{sup -} {mu}{sup +}{nu} using FOCUS data. FOCUS is a fixed target experiment at Fermilab that studies the physics of the charm quark. Particles containing charm are produced by photon-gluon fusion from the collision of a photon beam on a BeO target. The experiment is characterized by excellent vertex resolution and particle identification. The spectrometer consists of three systems for track reconstruction (two silicon systems and one multiwire proportional chamber system) and two magnets of opposite polarity. The polarity of the magnet is such that the events of e{sup +}e{sup -} pairs produced in the target (which constitutes the main background) travel through a central opening in the detectors without interactions. Particle momentum is measured from the deflection angle in the magnets. Three multicell Cerenkov counters are used for charged particle identification (for e, {pi}, K, and p). Two different tracking systems located after several interaction lengths of shielding material are used for muon identification. The energy of neutral pions and electrons is measured in two electromagnetic calorimeters, while an hadron calorimeter is used for measuring the neutron energy. During the last four years the FOCUS collaboration provided results on several charm topics: CP violation, D{sup 0}-{bar D}{sup 0} mixing, rare and forbidden decays, precision measurements of semileptonic decays, baryon and meson lifetimes, fully hadronic baryon and meson branching ratios, charm spectroscopy, Dalitz analyses of resonant structures, charm anti-charm production, QCD studies involving double charm particles, and pentaquarks. Semileptonic decays, besides having a clear signature for experiments, provide crucial information for theoretical studies. These decays carry information on the weak coupling of quarks since they can be used for measuring Cabibbo-Kobayashi-Maskawa matrix elements. Although the decay occurs through weak interaction, QCD effects due to quark confinement affect the decay amplitude. These effects can be included through the form factors, which are predicted by different theoretical approaches (quark models, lattice QCD, and sum rules). Experiments can measure form factor ratios, and from the comparison with theory they provide guidance for building a successful theory to describe hadrons.
Search for Neutral D Meson Mixing Using Semileptonic Decays
Author: Kevin T. Flood
Publisher:
ISBN:
Category :
Languages : en
Pages : 178
Book Description
Based on a 87 fb{sup -1} dataset, a search for D{sup 0}-{bar D}{sup 0} mixing is made using the semileptonic decay modes D*{sup +} {yields} {pi}{sup +} D{sup 0}, D{sup 0} {yields} [K/K*]e{nu} (+c.c.) at the B-Factory facility at the Stanford Linear Accelerator Center. These modes offer unambiguous initial and final-state charm flavor tags, and allow the combined use of the D{sup 0} lifetime and D*{sup +}-D{sup 0} mass difference ({Delta}M) in a global likelihood fit. The high-statistics sample of reconstructed unmixed semileptonic D{sup 0} decays is used to model both the {Delta}M distribution and the time-dependence of mixed events directly from the data. Neural networks are used both to select events and to fully reconstruct the D{sup 0}. A result consistent with no charm mixing has been obtained, R{sub mix}
Publisher:
ISBN:
Category :
Languages : en
Pages : 178
Book Description
Based on a 87 fb{sup -1} dataset, a search for D{sup 0}-{bar D}{sup 0} mixing is made using the semileptonic decay modes D*{sup +} {yields} {pi}{sup +} D{sup 0}, D{sup 0} {yields} [K/K*]e{nu} (+c.c.) at the B-Factory facility at the Stanford Linear Accelerator Center. These modes offer unambiguous initial and final-state charm flavor tags, and allow the combined use of the D{sup 0} lifetime and D*{sup +}-D{sup 0} mass difference ({Delta}M) in a global likelihood fit. The high-statistics sample of reconstructed unmixed semileptonic D{sup 0} decays is used to model both the {Delta}M distribution and the time-dependence of mixed events directly from the data. Neural networks are used both to select events and to fully reconstruct the D{sup 0}. A result consistent with no charm mixing has been obtained, R{sub mix}
Semileptonic Decays of Charged D Meson Going to Eta-lepton-neutrino with Generic Reconstruction of Fully Hadronic Charged D Meson and Neutral D Meson Decays
Author: Richard Carl Gray
Publisher:
ISBN: 9781109020489
Category :
Languages : en
Pages : 202
Book Description
We study the semileptonic decays D + & rarr; eta'e+nu and D+ & rarr; etae+nu using 818 pb-1 of e+ e- collisions recorded by the CLEO-c detector located at the Cornell Electron Storage Ring. We employ a technique that uses the detector hermeticity to reconstruct the neutrino as missing energy and momentum. We improve the neutrino resolution by developing a generic algorithm to reconstruct the non-signal D, and constrain systematic uncertainties in the efficiency by using the algorithm to measure the branching fractions of D+ and D0 hadronic decays. We observe and measure the branching fractions of 67 hadronic decays, 32 of which are not listed in the PDG 2008. We find B (D+ & rarr; eta'e +nu) = (2.16 +/- 0.53 +/- 0.05 +/- 0.05) x 10-4 and B (D+ & rarr; etae +nu) = (11.7 +/- 0.98 +/- 0.34 +/- 0.26) x 10-4. Among the 67 D hadronic branching fractions observed in this analysis, we discover the decay B (D+ & rarr; pi+etaeta) = (0.34 +/- 0.06 +/- 0.032)% which is unexpectedly large considering the limited phase space available to the decay.
Publisher:
ISBN: 9781109020489
Category :
Languages : en
Pages : 202
Book Description
We study the semileptonic decays D + & rarr; eta'e+nu and D+ & rarr; etae+nu using 818 pb-1 of e+ e- collisions recorded by the CLEO-c detector located at the Cornell Electron Storage Ring. We employ a technique that uses the detector hermeticity to reconstruct the neutrino as missing energy and momentum. We improve the neutrino resolution by developing a generic algorithm to reconstruct the non-signal D, and constrain systematic uncertainties in the efficiency by using the algorithm to measure the branching fractions of D+ and D0 hadronic decays. We observe and measure the branching fractions of 67 hadronic decays, 32 of which are not listed in the PDG 2008. We find B (D+ & rarr; eta'e +nu) = (2.16 +/- 0.53 +/- 0.05 +/- 0.05) x 10-4 and B (D+ & rarr; etae +nu) = (11.7 +/- 0.98 +/- 0.34 +/- 0.26) x 10-4. Among the 67 D hadronic branching fractions observed in this analysis, we discover the decay B (D+ & rarr; pi+etaeta) = (0.34 +/- 0.06 +/- 0.032)% which is unexpectedly large considering the limited phase space available to the decay.
The Properties of Semileptonic Decays of Charmed D Mesons
Author: Daniel Mark Coffman
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 240
Book Description
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 240
Book Description
Measurement of the Form Factors and Branching Ratio for the Charmed Meson Semileptonic Decay Mode D--−K*0(892)[mu]+[nu][subscript Mu]
Author: Steven W. Culy
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 452
Book Description
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 452
Book Description
Pseudoscalar Semileptonic Decays of the D0 Meson
Author: Lorenzo Agostino
Publisher:
ISBN:
Category : Leptons (Nuclear physics)
Languages : en
Pages : 288
Book Description
Publisher:
ISBN:
Category : Leptons (Nuclear physics)
Languages : en
Pages : 288
Book Description