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Showing 1 to 15 of 15 for “"mass difference"”.
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Precision Measurement of the Mass Difference of Neutral and Charged B Mesons
… work presents a precision determination of the mass difference of neutral and charged B mesons, m(B0) - m(B+). The measurement is based on a data sample of about 232 million B-meson pairs recorded with the BABAR detector at the e+e- storage-ring system PEP-II. In events of e+e- --> …
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Recoil Momenta in the Decay of Beryllium-7 and the Neutron-Hydrogen Mass Difference
Made available in DSpace on 2015-05-12T17:11:37Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0002084.PDF: 3373831 bytes, checksum: 91eaf4d4afc892c62e8b29f974e0171a (MD5) Previous issue date: 1950
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Photoproduction of the (Positive, Negative) D* Meson
… The observation exploited the small D('*+)-D('0) mass difference to reduce the combinatoric background by 3 orders of magnitude. A variety of analysis techniques are presented to demonstrate that the D('*+) is created by a diffractive pair production mechanism, with a cross section given by
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Charge Symmetry Violation Quark Distributions via Precise Measurement of π+/π− Ratios in Semi-inclusive Deep Inelastic Scattering
… (QCD), charge symmetry is broken by the mass difference between the up and down quarks. CSV in the valence region can be extracted from precision measurements of the cross section ratio of charged pion production in semi-inclusive deep inelastic scattering (SIDIS) from deuterium. Such …
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Flavor physics beyond the standard model
… the Standard Model the quark and charged lepton mass hierarchy. We show that the experimental value of the lifetime difference in D⊃0⊃-anti-D⊃0⊃ mixing may be due to destructive interference of the Standard Model and New Physics contributions. We examine next possible correlations between the New …
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Some results of the algebra of currents in weak interactions. Part I: The decays K -> 2pi and K -> 2 pi gamma; Part II: Relation between vector and axial-vector cabibbo angles in broken SU(3) symmetry
… rule AI = 1/2 caused by the electromagnetic mass .difference [equation] as has been conjectured by some authors but has to be aqcounted for by the I = 3/2 part of the weak Hamiltonian. We also look for effects of CP violation in differences of the decay rates [equation] and [equation] in the …
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Isotope effect for diffusion of tin in beta-titanium
… 0.37 ± 0.03 at 15250 C. When corrected for the mass difference between the Sn tracers used and the Ti solvent, the magnitude of the effect seems to be consistent with a relaxed vacancy mechanism as observed in normall bcc metals. Between 1100 and 12000 C the isotope effect parameter increases …
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Some Aspects of Symmetry Breaking in Unified Weak-Electromagnetic Gauge Theories
… a way that all of the weak vector mesons acquire mass but the photon remains massless? In Chapter 4, in the context of a specific model, we study the effects on calculable quantities, such as the proton-neutron mass difference, of varying the Higgs content and investigate the appearance of pions …
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Electrospray ionization mass spectrometry for the analysis of proteins and small molecules
… and small molecules by Electrospray Ionization Mass Spectrometry (ESI-MS) are discussed. Section I contains an introduction to ESI-MS, including a brief history of mass spectrometry, a discussion of the current theories developed to explain the mechanisms at work during the electrospray process, …
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Determining the role of neglected N+ heavy ions in the earth’s inner magnetosphere
… between O+ and N+ due to their similar masses. For example, the magnetospheric missions, such as the Magnetospheric Multiscale Mission and the Van Allen Probes, cannot distinguish N+ from O+ because of their similar masses. However, the limited observations of N+ both in the ionosphere …
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Method development for the comprehensive analysis of post translational modifications by mass spectometry
… (PTM). As PTMs add or subtract a specific mass difference to a protein, mass spectrometry becomes very amenable for modification analysis. These modifications have conventionally been monitored by fragmenting the modified protein or peptide by collision induced dissociation (CID) within the …
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Pollution effects on body mass distributions of freshwater benthic communities
… among these sites. Visual observation of body mass pattern showed skewed distributions towards smaller size classes and most had two very obvious modes at medium and large size classes except for the most polluted habitats. Similarly, statistically rigorous estimates using Kernel Density …
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Synthesis, Characterization and Electrochemical Properties of Gold Nanomolecules
… Ligand exchange reactions are monitored by mass spectrometry. Exploiting the mass difference of various ligands to monitor ligand exchange reactions is explained. Ligand exchange with dithiols is covered in this chapter. Interstaple vs intrastaple dithiol binding, optimum chain length for …
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Glycan characterizations with application in metal ion binding, the 1918 influenza virus neuraminidase formation and human receptors
… the sugar function of this glycoprotein, a new mass spectrometry-based strategy was applied with a focus on the comprehensive characterization of its N-glycans. This included: (a) accurate mass measurement and GC/MS to determine the monosaccharide compositions; (b) positive ion CID-MS n to …
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DNA enzymes for peptide-nucleic acid conjugation and for lysine methylation
… DNA oligonucleotide provides a substantial mass difference to allow PAGE separation of the catalytically active DNA. Selection experiments led to several deoxyribozymes that catalyze peptide-RNA conjugation of untethered peptides. Separate selection experiments were performed using a …