skip to main content

DOE PAGESDOE PAGES

Title: Effective field theory approach to heavy quark fragmentation

Using an approach based on Soft Collinear Effective Theory (SCET) and Heavy Quark Effective Theory (HQET) we determine the b-quark fragmentation function from electron-positron annihilation data at the Z-boson peak at next-to-next-to leading order with next-to-next-to leading log resummation of DGLAP logarithms, and next-to-next-to-next-to leading log resummation of endpoint logarithms. This analysis improves, by one order, the previous extraction of the b-quark fragmentation function. We find that while the addition of the next order in the calculation does not much shift the extracted form of the fragmentation function, it does reduce theoretical errors indicating that the expansion is converging. Using an approach based on effective field theory allows us to systematically control theoretical errors. Furthermore, while the fits of theory to data are generally good, the fits seem to be hinting that higher order correction from HQET may be needed to explain the b-quark fragmentation function at smaller values of momentum fraction.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Johannes Gutenberg Univ., Mainz (Germany)
  2. Univ. of Arizona, Tucson, AZ (United States)
  3. Seoul National Univ. of Science and Technology, Seoul (Korea)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-16-24386
Journal ID: ISSN 1029-8479; TRN: US1701241
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 11; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Atomic and Nuclear Physics
OSTI Identifier:
1343710

Fickinger, Michael, Fleming, Sean, Kim, Chul, and Mereghetti, Emanuele. Effective field theory approach to heavy quark fragmentation. United States: N. p., Web. doi:10.1007/JHEP11(2016)095.
Fickinger, Michael, Fleming, Sean, Kim, Chul, & Mereghetti, Emanuele. Effective field theory approach to heavy quark fragmentation. United States. doi:10.1007/JHEP11(2016)095.
Fickinger, Michael, Fleming, Sean, Kim, Chul, and Mereghetti, Emanuele. 2016. "Effective field theory approach to heavy quark fragmentation". United States. doi:10.1007/JHEP11(2016)095. https://www.osti.gov/servlets/purl/1343710.
@article{osti_1343710,
title = {Effective field theory approach to heavy quark fragmentation},
author = {Fickinger, Michael and Fleming, Sean and Kim, Chul and Mereghetti, Emanuele},
abstractNote = {Using an approach based on Soft Collinear Effective Theory (SCET) and Heavy Quark Effective Theory (HQET) we determine the b-quark fragmentation function from electron-positron annihilation data at the Z-boson peak at next-to-next-to leading order with next-to-next-to leading log resummation of DGLAP logarithms, and next-to-next-to-next-to leading log resummation of endpoint logarithms. This analysis improves, by one order, the previous extraction of the b-quark fragmentation function. We find that while the addition of the next order in the calculation does not much shift the extracted form of the fragmentation function, it does reduce theoretical errors indicating that the expansion is converging. Using an approach based on effective field theory allows us to systematically control theoretical errors. Furthermore, while the fits of theory to data are generally good, the fits seem to be hinting that higher order correction from HQET may be needed to explain the b-quark fragmentation function at smaller values of momentum fraction.},
doi = {10.1007/JHEP11(2016)095},
journal = {Journal of High Energy Physics (Online)},
number = 11,
volume = 2016,
place = {United States},
year = {2016},
month = {11}
}