☆ 4.7 Article

Searching for the signal of dark matter and photon associated production at the LHC beyond leading order

PHYSICAL REVIEW D (2013)

期刊

PHYSICAL REVIEW D

卷 87, 期 9, 页码 -

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AMER PHYSICAL SOC

DOI: 10.1103/PhysRevD.87.094018

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Astronomy & Astrophysics Physics, Particles & Fields

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National Natural Science Foundation of China [11021092, 10975004, 11135003]
National Natural Science Foundation of China [11021092, 10975004, 11135003]

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We study the signal of dark matter and photon associated production induced by the vector and axial-vector operators at the LHC, including the QCD next-to-leading order (NLO) effects. We find that the QCD NLO corrections reduce the dependence of the total cross sections on the factorization and renormalization scales, and the K factors increase with the increasing of the dark matter mass, which can be as large as about 1.3 for both the vector and axial-vector operators. Using our QCD NLO results, we improve the constraints on the new physics scale from the results of the recent CMS experiment. Moreover, we show the Monte Carlo simulation results for detecting the gamma + (sic)(T) signal at the QCD NLO level, and present the integrated luminosity needed for a 5 sigma discovery at the 14 TeV LHC. If the signal is not observed, the lower limit on the new physics scale can be set.

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Analytic two-loop QCD amplitudes for tW production: Leading color and light fermion-loop contributions

Long -Bin Chen, Liang Dong, Hai Tao Li, Zhao Li, Jian Wang, Yefan Wang

Summary: We present the analytical results of two-loop QCD amplitudes for hadronic tW production, focusing on leading color and light fermion-loop contributions. The calculation of two-loop integrals is performed using the method of canonical differential equations. The results are expressed in terms of multiple polylogarithms and checked by comparing the infrared divergences with predictions from anomalous dimensions. Combining these with previously computed one-loop squared amplitudes, we obtain the hard function relevant to a next-to-next-to-leading order Monte Carlo calculation. We find that the hard function varies slowly in the region with small top-quark velocity but increases dramatically in the region with large top-quark velocity. After phase space integration and convolution with the parton distribution function, the leading color hard function gives a correction of about 5.4% to the leading order cross section, while the light fermion-loop diagrams contribute about -1.4%.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Anisotropy of phase transition gravitational wave and its implication for primordial seeds of the Universe

Yongping Li, Fa Peng Huang, Xiao Wang, Xinmin Zhang

Summary: This study quantitatively examines how the primordial density fluctuations are reflected in the anisotropy of the phase transition gravitational wave (PTGW). The findings reveal that the PTGW anisotropy is stronger than the anisotropy of the cosmic microwave background temperature at all scales, and the differences in primordial power spectra are more significant in the angular power spectrum of PTGW anisotropy compared to that of the cosmic microwave background.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Sound velocity effects on the phase transition gravitational wave spectrum in the sound shell model

Xiao Wang, Fa Peng Huang, Yongping Li

Summary: Research shows that the sound velocity has a significant impact on the acoustic phase transition gravitational wave spectra, potentially altering the peak frequency and peak amplitude of the gravitational wave. Therefore, using more realistic sound velocities can provide more accurate predictions for gravitational wave experiments.

PHYSICAL REVIEW D (2022)

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