Bottom Production from Fixed-Target to Large Hadron Collider Energies

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We present a state-of-the-art compilation of the existing bottom production cross sections in elementary collisions, from fixed-target to collider experiments. We then discuss the theoretical uncertainties on the total and differential bottom cross sections in the FONLL approach. In particular, we show total cross sections and kinematical distributions of the bottom hadrons and their decays: B {yields} e/{mu}X, B {yields} D {yields} e/{mu}, and B {yields} J/{psi}X. After seeing that the calculations give a good description of the existing measurements, we present detailed predictions for the LHC experiments in their specific phase space windows. Recent improvements in heavy quark production ... continued below

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6 p. (0.4 MB)

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Nelson, R. E.; Vogt, R.; Lourenco, C. & Wohri, H. K. November 30, 2010.

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We present a state-of-the-art compilation of the existing bottom production cross sections in elementary collisions, from fixed-target to collider experiments. We then discuss the theoretical uncertainties on the total and differential bottom cross sections in the FONLL approach. In particular, we show total cross sections and kinematical distributions of the bottom hadrons and their decays: B {yields} e/{mu}X, B {yields} D {yields} e/{mu}, and B {yields} J/{psi}X. After seeing that the calculations give a good description of the existing measurements, we present detailed predictions for the LHC experiments in their specific phase space windows. Recent improvements in heavy quark production theory and experimental measurements at colliders, especially for bottom production, have shown that the perturbative QCD framework seems to work rather well, see Refs. [1, 2]. It is important to continue to validate this theoretical framework and its phenomenological inputs, extracted from other measurements, with new data such as that obtained by the CMS collaboration in pp collisions at {radical}s = 7 TeV. We validate the FONLL approach with lower energy data and also compare the results with preliminary LHC data. By showing good agreement between the calculations and the data, we demonstrate we can confidently extrapolate our results to energies appropriate for heavy-ion measurements. Total cross section calculations using the FONLL approach for pp {yields} B{bar B} show excellent agreement across a wide range of {radical}s at both full phase space and CDF phase space. This provides confidence that extrapolating to LHC energies will also show good agreement. Differential cross section FONLL calculations (d{sigma}/dp{sub T} and d{sigma}/d{eta}) at 7 TeV have been compared to preliminary CMS results. The agreement is quite striking. In addition, B fraction calculations have been made that also compare well to the CMS data. This should allow us to expect good agreement between further FONLL calculations and other observables.

Physical Description

6 p. (0.4 MB)

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PDF-file: 6 pages; size: 0.4 Mbytes

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  • Presented at: Hard Probes 2010, Eilat, Israel, Oct 10 - Oct 15, 2010

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  • Report No.: LLNL-PROC-465216
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1018001
  • Archival Resource Key: ark:/67531/metadc838079

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  • November 30, 2010

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • April 17, 2017, 12:19 p.m.

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Nelson, R. E.; Vogt, R.; Lourenco, C. & Wohri, H. K. Bottom Production from Fixed-Target to Large Hadron Collider Energies, article, November 30, 2010; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc838079/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.