578 research outputs found
Resummation prediction on gauge boson pair production with a jet veto
We investigate the resummation effects with a jet veto, for WZ and ZZ
productions at the LHC in soft-collinear effective theory. We present the
invariant mass distributions and the total cross section with different jet
veto and jet radius for these process at Next-to-Next-to-Leading-Logarithmic
level. Our results show that the jet-veto resummation can increase the jet-veto
cross section and decrease the scale uncertainties, especially in the large
center-of-mass energy. We find that for pt_veto>30 GeV and R=0.4, the
resummation results can increase POWHEG+PYTHIA predictions by about 19% for WZ
production and 18% for ZZ production, respectively. Our results agree with the
CMS data for WZ productions within 2 C.L. at 8 TeV, which can explain
the 2 discrepancy between the CMS experimental results and theoretical
predictions based on NLO calculation with parton showers.Comment: 15 pages, 11 figure
Signature of the +jet and dijet production mediated by an excited quark with QCD next-to-leading order accuracy at the LHC
We present a detailed study of the production and decay of the excited quark
at the QCD next-to-leading order (NLO) level at the Large Hadron Collider,
using the narrow width approximation and helicity amplitudes method. We find
that the QCD NLO corrections can tighten the constraints on the model
parameters and reduce the scale dependencies of the total cross sections. We
discuss the signals of the excited quark production with decay mode
and , and present several
important kinematic distributions. Moreover, we give the upper limits of the
excited quark excluded mass range and the allowed parameter space for the
coupling constants and the excited quark mass.Comment: 20 pages, 13 figures; version published in PR
Resummation prediction on the jet mass spectrum in one-jet inclusive production at the LHC
We study the factorization and resummation prediction on the jet mass
spectrum in one-jet inclusive production at the LHC based on soft-collinear
effective theory. The soft function with anti- algorithm is calculated at
next-to-leading order and its validity is demonstrated by checking the
agreement between the expanded leading singular terms with the exact
fixed-order result. The large logarithms and the global
logarithms in the process are resummed to all order at
next-to-leading logarithmic and next-to-next-to-leading logarithmic level,
respectively. The cross section is enhanced by about 23% from the
next-to-leading logarithmic level to next-to-next-to-leading logarithmic level.
Comparing our resummation predictions with those from Monte Carlo tool PYTHIA
and ATLAS data at the 7 TeV LHC, we find that the peak positions of the jet
mass spectra agree with those from PYTHIA at parton level, and the predictions
of the jet mass spectra with non-perturbative effects are in coincidence with
the ATLAS data. We also show the predictions at the future 13 TeV LHC.Comment: 43 pages, 10 figure
Threshold Resummation for WZ and ZZ Pair Production at the LHC
We perform the threshold resummation for WZ and ZZ pair production at the
next-to-next-to-leading logarithmic accuracy in Soft-Collinear Effective Theory
at the LHC. Our results show that the resummation effects increase the total
cross sections by about 7% for ZZ production and 12% for WZ production
with$\sqrt{S}= 7,~8,~13 and 14 TeV, respectively, and the scale uncertainties
are significantly reduced. Besides, our numerical results are well consistent
with experimental data reported by the ATLAS and CMS collaborations.Comment: 14 pages, 8 figures, 2 tables, version published in Phys.Rev.
Threshold resummation for the production of a color sextet (antitriplet) scalar at the LHC
We investigate threshold resummation effects in the production of a color
sextet (antitriplet) scalar at next-to-next-to-leading logarithmic (NNLL) order
at the LHC in the frame of soft-collinear effective theory. We show the total
cross section and the rapidity distribution with NLO+NNLL accuracy, and we
compare them with the NLO results. Besides, we use recent dijet data at the LHC
to give the constraints on the couplings between the colored scalars and
quarks.Comment: 21 pages,9 figures,3 tables; Version published in EPJ
Transverse momentum resummation for color sextet and antitriplet scalar production at the LHC
We study the factorization and resummation of the transverse momentum
spectrum of the color sextet and antitriplet scalars produced at the LHC based
on soft-collinear effective theory. Compared to Z boson and Higgs production, a
soft function is required to account for the soft gluon emission from the
final-state colored scalar. The soft function is calculated at the
next-to-leading order, and the resummation is performed at the approximate
next-to-next-to-leading logarithmic accuracy. The non-perturbative effects and
PDF uncertainties are also discussed.Comment: 20 pages, 7 figure
Transverse-Momentum Resummation for Gauge Boson Pair Production at the Hadron Collider
We perform the transverse-momentum resummation for , , and
pair productions at the next-to-next-to-leading logarithmic accuracy
using soft-collinear effective theory for and
at the LHC, respectively. Especially, this is the
first calculation of transverse-momentum resummation. We also
include the non-perturbative effects and discussions on the PDF uncertainties.
Comparing with the next-to-leading logarithmic results, the
next-to-next-to-leading logarithmic resummation can reduce the dependence of
the transverse-momentum distribution on the factorization scales significantly.
Finally, we find that our numerical results are consistent with data measured
by CMS collaboration for the production, which have been only reported by
the LHC experiments for the unfolded transverse-momentum distribution of the
gauge boson pair production so far, within theoretical and experimental
uncertainties.Comment: 22 pages, 6 figures, re-versio
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