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First Measurement Of The Beam Normal Single Spin Asymmetry In Delta Resonance Production By Q Rm Weak
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Book Synopsis First Measurement of the Beam Normal Single Spin Asymmetry in $[Delta]$ Resonance Production by $Q_{\rm Weak}$ by :
Download or read book First Measurement of the Beam Normal Single Spin Asymmetry in $[Delta]$ Resonance Production by $Q_{\rm Weak}$ written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The beam normal single spin asymmetry ($B_{\rm n}$) is generated in the scattering of transversely polarized electrons from unpolarized nuclei. The asymmetry arises from the interference of the imaginary part of the two-photon exchange with the one-photon exchange amplitude. The $Q_{\rm weak}$ experiment has made the first measurement of $B_{\rm n}$ in the production of the $\Delta$(1232) resonance, using the $Q_{\rm weak}$ apparatus in Hall-C at the Thomas Jefferson National Accelerator Facility. The final transverse asymmetry, corrected for backgrounds and beam polarization, is $B_{\rm n}$ = 43 $\pm$ 16 ppm at beam energy 1.16 GeV at an average scattering angle of about 8.3 degrees, and invariant mass of 1.2 GeV. The measured preliminary $B_{\rm n}$ agrees with a preliminary theoretical calculation. $B_{\rm n}$ for the $\Delta$ is the only known observable that is sensitive to the $\Delta$ elastic form-factors ($\gamma$*$\Delta\Delta$) in addition to the generally studied transition form-factors ($\gamma$*N$\Delta$), but extracting this information will require significant theoretical input.
Book Synopsis Beam Normal Single Spin Asymmetry in Forward Angle Inelastic Electron-Proton Scattering Using the Q-Weak Apparatus by :
Download or read book Beam Normal Single Spin Asymmetry in Forward Angle Inelastic Electron-Proton Scattering Using the Q-Weak Apparatus written by and published by . This book was released on 2014 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Q-weak experiment in Hall-C at the Thomas Jefferson National Accelerator Facility has made the first direct measurement of the weak charge of the proton through the precision measurement of the parity-violating asymmetry in elastic electron-proton scattering at low momentum transfer. There is also a parity conserving Beam Normal Single Spin Asymmetry or transverse asymmetry (B_n) on H_2 with a sin(phi)-like dependence due to two-photon exchange. If the size of elastic B_n is a few ppm, then a few percent residual transverse polarization in the beam, combined with small broken azimuthal symmetries in the detector, would require a few ppb correction to the Q-weak data. As part of a program of B_n background studies, we made the first measurement of B_n in the N-to-Delta(1232) transition using the Q-weak apparatus. The final transverse asymmetry, corrected for backgrounds and beam polarization, was found to be B_n = 42.82 ± 2.45 (stat) ± 16.07 (sys) ppm at beam energy E_beam = 1.155 GeV, scattering angle theta = 8.3 deg, and missing mass W = 1.2 GeV. B_n from electron-nucleon scattering is a unique tool to study the gamma*̂ Delta Delta form factors, and this measurement will help to improve the theoretical models on beam normal single spin asymmetry and thereby our understanding of the doubly virtual Compton scattering process. To help correct false asymmetries from beam noise, a beam modulation system was implemented to induce small position, angle, and energy changes at the target to characterize detector response to the beam jitter. Two air-core dipoles separated by 1̃0 m were pulsed at a time to produce position and angle changes at the target, for virtually any tune of the beamline. The beam energy was modulated using an SRF cavity. The hardware and associated control instrumentation will be described in this dissertation. Preliminary detector sensitivities were extracted which helped to reduce the width of the measured asymmetry. The beam modulation system has also proven valuable for tracking changes in the beamline optics, such as dispersion at the target.
Book Synopsis Exclusive Phi Production Beam Spin Asymmetry Measurements with CLAS12 by : Brandon Clary
Download or read book Exclusive Phi Production Beam Spin Asymmetry Measurements with CLAS12 written by Brandon Clary and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the beam spin asymmetry (BSA) of the exclusive electroproduction of the vector phi(1020) meson through its decay into charged Kaons have been performed. The data set used was based on the RG-A run period from the recently upgraded CEBAF Large Acceptance Spectrometer (CLAS12) in Hall B at Jefferson National Lab (JLab). The run period used a 10.6 GeV longitudinally polarized electron beam and an unpolarized hydrogen target. The available statistics collected allow for detailed studies of the W, -t, xB, and Q2 dependencies of the BSA amplitudes from phi production. The BSA measurements will shed light on the exchange mechanisms responsible for phi production at JLab energies. In this dissertation, a non-zero BSA is observed, which suggests a possible enhancement of pseudo-scalar exchange mechanism near production threshold. Therefore, the non-zero BSA may be a result of the interference of the pseudo-scalar exchange mechanism with a scalar one. Ultimately, information on the dominant exchange mechanism will aid in the development of a Generalized Parton Distribution (GPD) based description of these processes in the context of hard to soft transition.
Book Synopsis Beam Spin Asymmetry Measurements from Deeply Virtual Meson Production by : Bo Zhao
Download or read book Beam Spin Asymmetry Measurements from Deeply Virtual Meson Production written by Bo Zhao and published by . This book was released on 2008 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Initial-State Interactions and Single-Spin Asymmetries in Drell-Yan Processes by :
Download or read book Initial-State Interactions and Single-Spin Asymmetries in Drell-Yan Processes written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tematsko Savetovanje // Vojvodansko Drustvo za poljoprivrednu tehniku ; 15 by :
Download or read book Tematsko Savetovanje // Vojvodansko Drustvo za poljoprivrednu tehniku ; 15 written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Single-spin Beam Asymmetry in Semi-exclusive Deep-inelastic Electroproduction by : C. E. Carlson
Download or read book Single-spin Beam Asymmetry in Semi-exclusive Deep-inelastic Electroproduction written by C. E. Carlson and published by . This book was released on 2003 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent measurements from Jefferson Lab show significant beam single spin asymmetries in deep inelastic scattering. The asymmetry is due to interference of longitudinal and transverse photoabsorption amplitudes which have different phases induced by the final-state interaction between the struck quark and the target spectators. We developed a dynamical model for a single-spin beam asymmetry in deep-inelastic scattering. Our results are consistent with the experimentally observed magnitude of this effect. We conclude that similar mechanisms involving quark orbital angular momentum ('Sivers effect') are responsible for both target and beam single-spin asymmetries.
Book Synopsis Beam Spin Asymmetry Measurements in Deeply Virtual Compton Scattering by : Gagik Gavalian
Download or read book Beam Spin Asymmetry Measurements in Deeply Virtual Compton Scattering written by Gagik Gavalian and published by . This book was released on 2004 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Beam-, Target- and Double-spin Asymmetry Measurements in Deeply Virtual Π0, Π+ and Π- Meson Production by : Gavin William Murdoch
Download or read book Beam-, Target- and Double-spin Asymmetry Measurements in Deeply Virtual Π0, Π+ and Π- Meson Production written by Gavin William Murdoch and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Beam Parameter Monitoring in a Measurement of the Weak Mixing Angle in Moeller Scattering by :
Download or read book Precision Beam Parameter Monitoring in a Measurement of the Weak Mixing Angle in Moeller Scattering written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A precision measurement of the parity nonconserving left-right asymmetry, A{sub LR}, in Moeller scattering (e−e− → e−e−) is currently in progress at the Stanford Linear Accelerator Center (SLAC). This experiment, labeled SLAC-E158, scatters longitudinally polarized electrons off atomic electrons in an unpolarized hydrogen target at a Q2 of 0.03 (GeV/c)2. The asymmetry, which is the fractional difference in the scattering cross-sections, measures the effective pseudo-scalar weak neutral current coupling, g{sub ee}, governing Moeller scattering. This quantity is in turn proportional to (1/4 - sin2 [theta]{sub w}), where [theta]{sub w} is the electroweak mixing angle. The goal is to measure the asymmetry to a precision of 1 x 10−8 which corresponds to [delta](sin2 [theta]{sub w}) ≈ 0.0007. Since A{sub LR} is a function of the cross-sections, and the cross-sections depend on the beam parameters, the desired precision of A{sub LR} places stringent requirements on the beam parameters. This paper investigates the requirements on the beam parameters and discusses the means by which they are monitored and accounted for.
Book Synopsis Precise Measurement of the Left-Right Asymmetry in Z[sup 0] Production by E[sup+]e[sup -] Collisions. Electron Beam Polarization Measurement with the Quartz Fiber Calorimeter by :
Download or read book Precise Measurement of the Left-Right Asymmetry in Z[sup 0] Production by E[sup+]e[sup -] Collisions. Electron Beam Polarization Measurement with the Quartz Fiber Calorimeter written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The completion of the SLD experiment marks the end of a very productive decade of the Z-pole physics, which brought dramatic improvements in the accuracy of electroweak measurements. Experimental study of the e[sup+]e[sup -][yields] Z[sup 0][yields] f[bar f] process, started about 11 years ago by the Mark II collaboration, proved to be an excellent source of electroweak information. The SLD and the four LEP experiments are now wrapping up their Z-pole data analyses. This thesis presents the final results of the left-right Z[sup 0] boson production cross section asymmetry (A[sub LR][sup 0]) measurement (which is unambiguously related to the effective electroweak mixing angle, sin 2[theta][sub W][sup eff]), based on the full data sample collected by the SLD collaboration. I will focus on the two latest SLD runs: 1996 and 1997/98. The analysis procedures used in previous runs are described in the theses by Ross King[1], Amitabh Lath[2], Robert Elia[3], and in the three Physical Review Letters[4, 5, 6].
Download or read book Qweak written by and published by . This book was released on 2014 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Qweak experiment at Hall C of Thomas Jefferson National Accelerator Facility has made the first direct measurement of the weak charge of the proton, QWp, through a precision measurement of the parity-violating asymmetry in elastic e-p scattering at low momentum transfer Q2= 0.025 (GeV/c)2 with incident electron beam energy of 1.155 GeV. The Qweak experiment, along with earlier results of parity violating elastic scattering experiments, is expected to determine the most precise value of QWp which is suppressed in the Standard Model. If this result is further combined with the 133Cs atomic parity violation (APV) measurement, significant constraints on the weak charge of the up quark, down quark, and neutron can be extracted. This data will also be used to determine the weak-mixing angle, sin2?W, with a relative uncertainty of
Book Synopsis Introduction to the Theory of Thermal Neutron Scattering by : G. L. Squires
Download or read book Introduction to the Theory of Thermal Neutron Scattering written by G. L. Squires and published by Cambridge University Press. This book was released on 2012-03-29 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: A long-awaited reprint of the book that has established itself as the classic textbook on neutron scattering. It will be an invaluable introductory text for students taking courses on neutron scattering, as well as for researchers and those who would like to deepen their knowledge on the subject through self-study.
Book Synopsis Physics Division Annual Report by : Argonne National Laboratory. Physics Division
Download or read book Physics Division Annual Report written by Argonne National Laboratory. Physics Division and published by . This book was released on 2001 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Science Citation Index written by and published by . This book was released on 1995 with total page 2552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1964- have guides and journal lists.
Book Synopsis Femtosecond Optical Frequency Comb: Principle, Operation and Applications by : Jun Ye
Download or read book Femtosecond Optical Frequency Comb: Principle, Operation and Applications written by Jun Ye and published by Springer Science & Business Media. This book was released on 2006-06-15 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last few years, there has been a convergence between the fields of ultrafast science, nonlinear optics, optical frequency metrology, and precision laser spectroscopy. These fields have been developing largely independently since the birth of the laser, reaching remarkable levels of performance. On the ultrafast frontier, pulses of only a few cycles long have been produced, while in optical spectroscopy, the precision and resolution have reached one part in Although these two achievements appear to be completely disconnected, advances in nonlinear optics provided the essential link between them. The resulting convergence has enabled unprecedented advances in the control of the electric field of the pulses produced by femtosecond mode-locked lasers. The corresponding spectrum consists of a comb of sharp spectral lines with well-defined frequencies. These new techniques and capabilities are generally known as “femtosecond comb technology. ” They have had dramatic impact on the diverse fields of precision measurement and extreme nonlinear optical physics. The historical background for these developments is provided in the Foreword by two of the pioneers of laser spectroscopy, John Hall and Theodor Hänsch. Indeed the developments described in this book were foreshadowed by Hänsch’s early work in the 1970s when he used picosecond pulses to demonstrate the connection between the time and frequency domains in laser spectroscopy. This work complemented the advances in precision laser stabilization developed by Hall.
Book Synopsis Hadron Interactions, by : P. D. B. Collins
Download or read book Hadron Interactions, written by P. D. B. Collins and published by CRC Press. This book was released on 1984 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intended for graduate students, advanced undergraduates and research staff in particle physics and related disciplines and will also be of interest to physicists not working in this field who want an overview of the present development of the subject.
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