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Book The Beauty and Charm Production Cross sections in 250 GeV C Pion Nucleon Interactions

Download or read book The Beauty and Charm Production Cross sections in 250 GeV C Pion Nucleon Interactions written by and published by . This book was released on 1993 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: By determining the production cross sections for heavy flavor hadrons, we test the theoretical predictions from perturhative quantum chroma-dynamics (QCD). In the case of pion induced beauty production, the few published results do not resolve the issue of the applicability of perturbative QCD. This analysis is undertaken in order to help resolve this situation. We determine the total beauty and charm production cross sections using an analysis of single electron decay products. We extract the cross sections per nucleon from the two-dimensional distribution of electron p versus impact parameter (d) to the primary vertex. We place an upper limit on the beauty production cross section of [sigma]b$\bar{b}$

Book A Measurement of the Differential Cross Section for the Reaction gamma N to pi P from Deuterium

Download or read book A Measurement of the Differential Cross Section for the Reaction gamma N to pi P from Deuterium written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a measurement of the differential cross section for the $\gamma n \to \pi^- p$ process from the CLAS detector at Jefferson Lab in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles ($\theta_{c.m.}$) between 50$^\circ$ and 115$^\circ$. We confirm a previous indication of a broad enhancement around a c.m. energy ($\sqrt{s}$) of 2.2 GeV at $\theta_{c.m.}=90^\circ$ in the scaled differential cross section, $s^7 {\frac{d\sigma}{dt}}$. Our data show the angular dependence of this enhancement as the scaling region is approached in the kinematic region from 70$^\circ$ to 105$^\circ$.

Book The Epem to Pi Pi Pi Pi K K Pi Pi and K K K K Cross Sections at Center of Mass Energies 0 5 4 5G eV Measured with Initial State Radiation

Download or read book The Epem to Pi Pi Pi Pi K K Pi Pi and K K K K Cross Sections at Center of Mass Energies 0 5 4 5G eV Measured with Initial State Radiation written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We study the process ee− 2!?+?−?+?−?, with a hard photon radiated from the initial state. About 60,000 fully reconstructed events have been selected from 89 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the effective e+e− center-of-mass energy, so that these data can be compared with the corresponding direct e+e− measurements. From the 4?-mass spectrum, the cross section for the process e+e− 2!?+?−?+?− is measured for center-of-mass energies from 0.6 to 4.5 GeV. The uncertainty in the cross section measurement is typically 5%. We also measure the cross sections for the final states K+K−?+− and K+K−K+K−. We observe the J/? in all three final states and measure the corresponding branching fractions. We search for X(3872) in J/?(2!?+?−)?+?− and obtain an upper limit on the product of the e+e− width of the X(3872) and the branching fraction for X(3872) 2!J/??+?−.

Book The E e 3 pi pi 2 pi pi pi 0 and K K 2 pi pi Cross Sections at Center of Mass Energies 0 5 4 5 GeV Measured with Initial StateRadiation

Download or read book The E e 3 pi pi 2 pi pi pi 0 and K K 2 pi pi Cross Sections at Center of Mass Energies 0 5 4 5 GeV Measured with Initial StateRadiation written by B. Aubert and published by . This book was released on 2006 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: We study the processes e{sup +}e{sup -} {yields} 3({pi}{sup +}{pi}{sup -}){gamma}, 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}){gamma} and K{sup +}K{sup -} 2({pi}{sup +} {sup -}){gamma}, with the photon radiated from the initial state. About 20,000, 33,000 and 4,000 fully reconstructed events, respectively, have been selected from 232 fb{sup -1} of BABAR data. The invariant mass of the hadronic final state defines the effective e{sup +}e{sup -} center-of-mass energy, so that these data can be compared with the corresponding direct e{sup +}e{sup -} measurements. From the 3({pi}{sup +}{pi}{sup -}), 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}) and K{sup +}K{sup -} 2({pi}{sup +}{pi}{sup -}) mass spectra, the cross sections for the processes e{sup +}e{sup -} {yields} 3({pi}{sup +}{sup -}), e{sup +}e{sup -} {yields} 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}) and e{sup +}e{sup -} {yields} K{sup +}K{sup -} 2({pi}{sup +}{pi}{sup -}) are measured for center-of-mass energies from production threshold to 4.5 GeV. The uncertainty in the cross section measurement is typically 6-15%. We observe the J/{psi} in all these final states and measure the corresponding branching fractions.

Book Measurement of the Differential Cross Section at 3 4 5 6 GEV C for the Reactions pi Negative arrow Ko lambda o and pi Negative P arrow Ko sigma o and of lambda o Polarization at 5 GEV C

Download or read book Measurement of the Differential Cross Section at 3 4 5 6 GEV C for the Reactions pi Negative arrow Ko lambda o and pi Negative P arrow Ko sigma o and of lambda o Polarization at 5 GEV C written by Abraham Lesnik and published by . This book was released on 1973 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Measurement of the Upsilon 1S Production Cross Section in Proton Proton Collisions at Center of Mass Energy 7 TeV

Download or read book Measurement of the Upsilon 1S Production Cross Section in Proton Proton Collisions at Center of Mass Energy 7 TeV written by Maxwell Ian Scherzer and published by . This book was released on 2011 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the cross section for upsilon(1S) production in proton-proton collisions at center of mass energy 7 TeV is presented. The measurement uses the upsilon(1S) 2!mu + mu decay mode and covers up to a transverse momentum of 26 GeV in two bins of rapidity; upsilon(1S) upsilon(1S) -1, collected with the ATLAS detector at the Large Hadron Collider. Templates derived from data are used to model the continuum background. In order to eliminate theoretical uncertainties due to the unknown polarization, the measurement is restricted to the case where both muons have a transverse momentum of p mu T> 4 GeV and a pseudorapidit

Book The Contrast

Download or read book The Contrast written by and published by . This book was released on 1876* with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Cross Section Measurements in the Main Injector Particle Production FNAL E907 Experiment at 58 GeV Energy

Download or read book Cross Section Measurements in the Main Injector Particle Production FNAL E907 Experiment at 58 GeV Energy written by Yusuf Oğuzhan Günaydın and published by . This book was released on 2009 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Measurement of the Total Photon proton Cross Section in the Center of Mass Energy Range 167 to 194 GeV microform

Download or read book A Measurement of the Total Photon proton Cross Section in the Center of Mass Energy Range 167 to 194 GeV microform written by Burkhard D. (Burkhard Dietrich) Burow and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: