Heavy-Quark Associated Production with One Hard Photon at Hadron Colliders
- Florida State Univ., Tallahassee, FL (United States)
We present the calculation of heavy-quark associated production with a hard photon at hadron colliders, namely $$pp(p\bar p) → Q\bar Q +X$$γ (for $Q=t,b$), at Next-to-Leading Order (NLO) in Quantum Chromodynamics (QCD). We study the impact of NLO QCD corrections on the total cross section and several differential distributions at both the Tevatron and the Large Hadron Collider (LHC). For $$t\bar t$$γ production we observe a sizeable reduction of the renormalization and factorization scale dependence when the NLO QCD corrections are included, while for $$b\bar b$$γ production a considerable scale dependence still persists at NLO in QCD. This is consistent with what emerges in similar processes involving $$b$$ quarks and vector bosons and we explain its origin in detail. For $$b\bar b$$γ production we study both the case in which at least one $$b$$ jet and the case in which at least two $$b$$ jets are observed. We perform the $$b\bar b$$γ calculation using the Four Flavor Number Scheme (4FNS) and compare the case where at least one $$b$$ jet is observed with the corresponding results from the Five Flavor Number Scheme (5FNS) calculation. Finally we compare our results for $$p\bar p →+b+X$$γ with the Tevatron data.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1248211
- Report Number(s):
- FERMILAB-THESIS-2013-37; 1321633
- Country of Publication:
- United States
- Language:
- English
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