Measurement of the D*(2010)+ Meson Width and the D*(2010)+ - D0 Mass Difference PDF Download
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Languages : en
Pages : 7
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Category :
Languages : en
Pages : 7
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Author: Zachary Huard
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Category :
Languages : en
Pages : 132
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I present the measurement of the natural line width of the D*+ meson, [Gamma](D*+), in the transition D*+ -> D0 [pi]^+ using 522.8 fb-1 of data from the BaBar detector. The D0 is reconstructed in two decay channels: D0 -> K-[pi]^+ and D0 -> K-[pi]^+[pi]-[pi]^+. We use Monte Carlo to simulate our reconstruction resolution in the difference of the reconstructed D*+ and reconstructed D0 masses. We fit a relativistic Breit-Wigner form convolved with the measured resolution function plus background to the mass difference distribution, allowing for an additional scale factor between simulated and real data. The dominant source of systematic uncertainty in the [Delta]m measurements is currently overestimated and will be reduced in the publication of this analysis after further assessment. Results are reported in natural units ([h-bar] = c = 1). Using the decay mode D0 -> K-[pi]^+ we find, [Gamma] = 83.4 ± 1.7 ± 1.4 keV[Delta] m = m(D*+) - m(D0) = 145425.6 ± 0.6 ± 1.5 keVUsing the decay mode D0-> K-[pi]+[pi]-[pi]+ we find, [Gamma] = 83.2 ± 1.5 ± 2.9 keV[Delta]m = m(D*+) - m(D0) = 145426.6 ± 0.5 ± 1.9 keVThe combined measurement is[Gamma] = 83.3 ± 1.3 ± 1.4 keV[Delta]m = 145425.8 ± 0.5 ± 1.6 keV.
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Languages : en
Pages : 14
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The decay width and mass of the D{sub s1}(2536) meson are measured via the decay channel D{sub s1}+ 2!D*+ K{sub S}° using 385 fb−1 of data recorded with the BABAR detector in the vicinity of the [Upsilon](4S) resonance at the PEP-II asymmetric-energy electron-positron collider. The result for the decay width is [Gamma](D{sub s1}+) = 0.92 ± 0.03 (stat.) ± 0.04 (syst.)MeV. For the mass, a value of m(D{sub s1}+) = 2535.08 ± 0.01 (stat.) ± 0.15 (syst.)MeV/c2 is obtained. The mass difference between the D{sub s1}+ and the D*+ is measured to be m(D{sub s1}+)-m(D*+) = 524.83 ± 0.01 (stat.) ± 0.04 (syst.)MeV/c2, representing a significant improvement compared to the current world average. The unnatural spin-parity assignment for the D{sub s1}+ meson is confirmed.
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Category : Particles (Nuclear physics)
Languages : en
Pages : 360
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Category : Hadrons
Languages : en
Pages : 382
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Category :
Languages : en
Pages : 16
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Category :
Languages : en
Pages : 7
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Category : Particles (Nuclear physics)
Languages : en
Pages : 652
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Author: BABAR Collaboration
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Category :
Languages : en
Pages : 19
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The decay width and the mass of the D{sub s1}(2536){sup {+-}} have been measured via the decay channel D{sub s1}{sup {+-}} {yields} D*{sup {+-}}K{sub S}{sup 0} using 232 fb{sup -1} of data collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. The result for the decay width is {Lambda}(D{sub s1}{sup {+-}}) = (1.03 {+-} 0.05 {+-} 0.12) MeV/c{sup 2}, with the first error denoting the statistical uncertainty and the second one the systematic uncertainty. For the mass, a value of m(D{sub s1}{sup {+-}}) = (2534.85 {+-} 0.02 {+-} 0.40) MeV/c{sup 2} has been obtained. The systematic error is dominated by the uncertainty on the D*{sup {+-}} mass. The mass difference between the D{sub s1}{sup {+-}} and D*{sup {+-}} has been measured to be {Delta}m = (524.85 {+-} 0.02 {+-} 0.04) MeV/c{sup 2}.
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Category :
Languages : en
Pages : 9
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This paper describes a measurement of the mass and of the width of two neutral narrow resonances D1° and D*2°, both composed of a charm quark and an up antiquark. The difference with respect to the well-known resonance D°, also neutral and with the same quark composition, is that the two quarks have an orbital momentum 1, which increases their binding energy. Therefore the mass is larger than that of the D°. Since the relative orientation of the spin is the same, in the limit of very large charm mass, the masses of these resonances should be the same; their small difference is predicted by theory and therefore important to measurement to distinguish the different models. These states have been observed in their decay into a kaon and three pions; two of these particles are required to originate from a displaced vertex with respect to the primary interaction vertex, to account for the longer lifetime of the charmed mesons. The resonances parameters have been extracted using a fitting procedure accounting for the expected resonance shape, including effects from detector resolution and background, providing a new best single measurement of the D1° and D*2° masses and a competitive measurement of their widths.
