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Heavy-flavor parton distributions without heavy-flavor matching prescriptions

Published version
Peer-reviewed

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Authors

Bertone, Valerio 
Glazov, Alexandre 
Papanastasiou, Andrew 

Abstract

We show that the well-known obstacle for working with the zero-mass variable flavor number scheme, namely, the omission of O(1) mass power corrections close to the conventional heavy flavor matching point (HFMP) mu_b=m, can be easily overcome. For this it is sufficient to take advantage of the freedom in choosing the position of the HFMP. We demonstrate that by choosing a sufficiently large HFMP, which could be as large as 10 times the mass of the heavy quark, one can achieve the following improvements: 1) above the HFMP the size of missing power corrections O(m) is restricted by the value of mu_b and, therefore, the error associated with their omission can be made negligible; 2) additional prescriptions for the definition of cross-sections are not required; 3) the resummation accuracy is maintained and 4) contrary to the common lore we find that the discontinuity of alpha_s and pdfs across thresholds leads to improved continuity in predictions for observables. We have considered a large set of proton-proton and electron-proton collider processes, many through NNLO QCD, that demonstrate the broad applicability of our proposal.

Description

Keywords

hep-ph, hep-ph, hep-ex

Journal Title

JHEP 1804 (2018) 046

Conference Name

Journal ISSN

1126-6708
1029-8479

Volume Title

46

Publisher

Springer
Sponsorship
Science and Technology Facilities Council (ST/J000434/1)
Royal Society (DH150088)
European Research Council (683211)