All Outputs (51)

NNLO hard functions in massless QCD (2014)
Journal Article
Broggio, A., Ferroglia, A., Pecjak, B. D., & Zhang, Z. (2014). NNLO hard functions in massless QCD. Journal of High Energy Physics, 2014(12), Article 005. https://doi.org/10.1007/jhep12%282014%29005

We derive the hard functions for all 2 → 2 processes in massless QCD up to next-to-next-to-leading order (NNLO) in the strong coupling constant. By employing the known one- and two-loop helicity amplitudes for these processes, we obtain analytic expr... Read More about NNLO hard functions in massless QCD.

Boosted Top Quark Pair Production in Soft Collinear Effective Theory (2014)
Presentation / Conference Contribution
Ferroglia, A., Marzani, S., Pecjak, B. D., & Yang, L. L. (2014, December). Boosted Top Quark Pair Production in Soft Collinear Effective Theory. Presented at 2nd Conference on Large Hadron Collider Physics Conference (LHCP 2014), New York, USA

On new physics in Delta Gammad (2014)
Journal Article
Bobeth, C., Haisch, U., Lenz, A., Pecjak, B., & Tetlalmatzi-Xolocotzi, G. (2014). On new physics in Delta Gammad. Journal of High Energy Physics, 2014(6), Article 40. https://doi.org/10.1007/jhep06%282014%29040

Motivated by the recent measurement of the dimuon asymmetry by the DØ collaboration, which could be interpreted as an enhanced decay rate difference in the neutral B d -meson system, we investigate the possible size of new-physics contributions to ΔΓ... Read More about On new physics in Delta Gammad.

Boosted top production: factorization and resummation for single-particle inclusive distributions (2014)
Journal Article
Ferroglia, A., Marzani, S., Pecjak, B. D., & Yang, L. L. (2014). Boosted top production: factorization and resummation for single-particle inclusive distributions. Journal of High Energy Physics, 2014(1), Article 028. https://doi.org/10.1007/jhep01%282014%29028

We study single-particle inclusive (1PI) distributions in top-quark pair production at hadron colliders, working in the highly boosted regime where the top-quark p T is much larger than its mass. In particular, we derive a novel factorization formula... Read More about Boosted top production: factorization and resummation for single-particle inclusive distributions.

Top-quark pair production at high invariant mass: an NNLO soft plus virtual approximation (2013)
Journal Article
Ferroglia, A., Pecjak, B. D., & Yang, L. L. (2013). Top-quark pair production at high invariant mass: an NNLO soft plus virtual approximation. Journal of High Energy Physics, 2013(9), Article 032. https://doi.org/10.1007/jhep09%282013%29032

e obtain a soft plus virtual approximation to the NNLO QCD contributions to the top-pair invariant mass distribution at hadron colliders. It is valid up to corrections of order m2t/M2mt2/M2, with M the pair invariant mass. This is currently the most... Read More about Top-quark pair production at high invariant mass: an NNLO soft plus virtual approximation.

The NNLO soft function for the pair invariant mass distribution of boosted top quarks. (2012)
Journal Article
Ferroglia, A., Pecjak, B. D., & Yang, L. L. (2012). The NNLO soft function for the pair invariant mass distribution of boosted top quarks. Journal of High Energy Physics, 2012(10), Article 180. https://doi.org/10.1007/jhep10%282012%29180

At high values of the pair invariant mass the differential cross section for top-quark pair production at hadron colliders factorizes into soft, hard, and fragmentation functions. In this paper we calculate the next-to-next-to-leading-order (NNLO) co... Read More about The NNLO soft function for the pair invariant mass distribution of boosted top quarks..

Soft-gluon resummation for boosted top-quark production at hadron colliders. (2012)
Journal Article
Ferroglia, A., Pecjak, B. D., & Yang, L. L. (2012). Soft-gluon resummation for boosted top-quark production at hadron colliders. Physical Review D, 86(3), Article 034010. https://doi.org/10.1103/physrevd.86.034010

We investigate the production of highly energetic top-quark pairs at hadron colliders, focusing on the case where the invariant mass of the pair is much larger than the mass of the top quark. In particular, we set up a factorization formalism appropr... Read More about Soft-gluon resummation for boosted top-quark production at hadron colliders..

Top-quark production and QCD. (2012)
Journal Article
Kidonakis, N., & Pecjak, B. D. (2012). Top-quark production and QCD. The European Physical Journal C, 72(7), Article 2084. https://doi.org/10.1140/epjc/s10052-012-2084-0

We review theoretical calculations for top-quark production that include complete next-to-leading-order QCD corrections as well as higher-order soft-gluon corrections from threshold resummation. We discuss in detail the differences between various ap... Read More about Top-quark production and QCD..

Top-pair forward-backward asymmetry beyond next-to-leading order. (2011)
Journal Article
Ahrens, V., Ferroglia, A., Neubert, M., Pecjak, B. D., & Yang, L. L. (2011). Top-pair forward-backward asymmetry beyond next-to-leading order. Physical Review D, 84(7), Article 074004. https://doi.org/10.1103/physrevd.84.074004

We make use of recent results in effective theory and higher-order perturbative calculations to improve the theoretical predictions of the QCD contribution to the top-quark pair production forward-backward asymmetry at the Tevatron. In particular, we... Read More about Top-pair forward-backward asymmetry beyond next-to-leading order..

RG-improved single-particle inclusive cross sections and forward-backward asymmetry in tt¯tt¯ production at hadron colliders. (2011)
Journal Article
Ahrens, V., Ferroglia, A., Neubert, M., Pecjak, B. D., & Yang, L. (2011). RG-improved single-particle inclusive cross sections and forward-backward asymmetry in tt¯tt¯ production at hadron colliders. Journal of High Energy Physics, 2011(9), Article 070. https://doi.org/10.1007/jhep09%282011%29070

We use techniques from soft-collinear effective theory (SCET) to derive renormalization-group improved predictions for single-particle inclusive (1PI) observables in top-quark pair production at hadron colliders. In particular, we study the top-quark... Read More about RG-improved single-particle inclusive cross sections and forward-backward asymmetry in tt¯tt¯ production at hadron colliders..

Precision predictions for the t+t(bar) production cross section at hadron colliders. (2011)
Journal Article
Ahrens, V., Ferroglia, A., Neubert, M., Pecjak, B. D., & Yang, L. L. (2011). production cross section at hadron colliders. Physics Letters B, 703(2), 135-141. https://doi.org/10.1016/j.physletb.2011.07.058

We make use of recent results in effective theory and higher-order perturbative calculations to improve the theoretical predictions of the top-quark pair production cross section at hadron colliders. In particular, we supplement the fixed-order NLO c... Read More about Precision predictions for the t+t(bar) production cross section at hadron colliders..

Sum rule estimate of the subleading non-perturbative contributions to B s –B¯sB¯s mixing. (2011)
Journal Article
Mannel, T., Pecjak, B., & Pivovarov, A. (2011). Sum rule estimate of the subleading non-perturbative contributions to B s –B¯sB¯s mixing. The European Physical Journal C, 71(4), Article 1607. https://doi.org/10.1140/epjc/s10052-011-1607-4

We use QCD sum rules to compute the matrix elements of the ΔB=2 operators appearing in the heavy-quark expansion of the width difference of the B s mass eigenstates. The main focus of our analysis is on the subleading operators R 2 and R 3, which app... Read More about Sum rule estimate of the subleading non-perturbative contributions to B s –B¯sB¯s mixing..

NNLO corrections to B¯→Xuℓν¯ℓ and the determination of |V ub |. (2010)
Journal Article
Greub, C., Neubert, M., & Pecjak, B. (2010). NNLO corrections to B¯→Xuℓν¯ℓ and the determination of |V ub |. The European Physical Journal C, 65(3-4), 501-515. https://doi.org/10.1140/epjc/s10052-009-1210-0

Threshold expansion at order alpha(s)**4 for the t t-bar invariant mass distribution at hadron colliders. (2010)
Journal Article
Ahrens, V., Ferroglia, A., Neubert, M., Pecjak, B. D., & Yang, L. L. (2010). Threshold expansion at order alpha(s)**4 for the t t-bar invariant mass distribution at hadron colliders. Physics Letters B, 687(4-5), 331-337. https://doi.org/10.1016/j.physletb.2010.03.048

Flavor physics in the quark sector. (2010)
Journal Article
Antonelli, M., Asner, D., Bauer, D., Becher, T., Beneke, M., Bevan, A., …Zupan, J. (2010). Flavor physics in the quark sector. Physics Reports, 494(3-4), 197-414. https://doi.org/10.1016/j.physrep.2010.05.003

In the past decade, one of the major challenges of particle physics has been to gain an in-depth understanding of the role of quark flavor. In this time frame, measurements and the theoretical interpretation of their results have advanced tremendousl... Read More about Flavor physics in the quark sector..

Renormalization-Group Improved Predictions for Top-Quark Pair Production at Hadron Colliders. (2010)
Journal Article
Ahrens, V., Ferroglia, A., Neubert, M., Pecjak, B. D., & Yang, L. L. (2010). Renormalization-Group Improved Predictions for Top-Quark Pair Production at Hadron Colliders. Journal of High Energy Physics, 2010(9), Article 97. https://doi.org/10.1007/jhep09%282010%29097

Two-loop divergences of massive scattering amplitudes in non-abelian gauge theories. (2009)
Journal Article
Ferroglia, A., Neubert, M., Pecjak, B. D., & Yang, L. L. (2009). Two-loop divergences of massive scattering amplitudes in non-abelian gauge theories. Journal of High Energy Physics, 2009(11), https://doi.org/10.1088/1126-6708/2009/11/062

Two-loop divergences of QCD scattering amplitudes with massive partons. (2009)
Journal Article
Ferroglia, A., Neubert, M., Pecjak, B. D., & Yang, L. L. (2009). Two-loop divergences of QCD scattering amplitudes with massive partons. Physical Review Letters, 103(20), Article 201601. https://doi.org/10.1103/physrevlett.103.201601

Next-to-next-to-leading order corrections to anti-B ---> X(u) l anti-nu in the shape-function region. (2008)
Journal Article
Asatrian, H., Greub, C., & Pecjak, B. (2008). Next-to-next-to-leading order corrections to anti-B ---> X(u) l anti-nu in the shape-function region. Physical Review D, 78(11), Article 114028. https://doi.org/10.1103/physrevd.78.114028

Theory Review of Exclusive Rare Radiative Decays (2008)
Presentation / Conference Contribution
Pecjak, B. D. (2008, December). Theory Review of Exclusive Rare Radiative Decays. Presented at Proceedings, 6th Conference on Flavor Physics and CP Violation (FPCP 2008)