Reports

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2019-03-19
11:12
OpenAccess [PUBDB-2019-01605] Report/Journal Article

Improved constraints on the mixing and mass of $Z'$ bosons from resonant diboson searches at the LHC at $\sqrt{s}=13$ TeV and predictions for Run II
[DESY-18-170; arXiv:1809.08933]
New neutral vector bosons Z′ decaying to charged gauge boson pairs W$^+$W$^-$ are predicted in many scenarios of new physics, including models with an extended gauge sector such as E6, left-right symmetric ZLRS′ and the sequential standard model ZSSM′. For these benchmark models we calculate and present theoretical expectations for different values of the Z′ mass M2 and mixing parameter ξ. [...]
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2019-03-18
11:32
OpenAccess [PUBDB-2019-01570] Report/Journal Article

Scalar 1-loop Feynman integrals as meromorphic functions in space-time dimension d
[DESY 17-079, HCMUS-19-01, KW 18-004, arXiv:1812.10975]
The long-standing problem of representing the general massive one-loop Feynman integral as a meromorphic function of the space-time dimension d has been solved for the basis of scalar one- to four-point functions with indices one. In 2003 the solution of difference equations in the space-time dimension allowed to determine the necessary classes of special functions: self-energies need ordinary logarithms and Gauss hypergeometric functions $_{2}F_1$, vertices need additionally Kampé de Fériet-Appell functions $F_1$, and box integrals also Lauricella-Saran functions $F_S$ [...]
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2019-03-14
15:57
OpenAccess [PUBDB-2019-01551] Preprint/Report

Five-Loop Static Contribution to the Gravitational Interaction Potential of Two Point Masses
[arXiv:1902.11180; DESY-19-029; DO-TH-19/01]
 GO
We compute the static contribution to the gravitational interaction potential of two point masses in the velocity-independent five-loop (and 5th post-Newtonian) approximation to the harmonic coordinates effective action in a direct calculation. The computation is performed using effective field methods based on Feynman diagrams in momentum-space in $d = 3 - 2\varepsilon$ space dimensions. [...]
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2019-03-14
15:55
OpenAccess [PUBDB-2019-01550] Preprint/Report
et al
HEJ 2: High Energy Resummation for Hadron Colliders
[arXiv:1902.08430; DESY-19-028; IPPP/19/13; MCnet-19-05]
 GO
We present HEJ 2, a new implementation of the High Energy Jets formalism for high-energy resummation in hadron-collider processes as a flexible Monte Carlo event generator. In combination with a conventional fixed-order event generator, HEJ 2 can be used to obtain greatly improved predictions for a number of phenomenologically important processes by adding all-order logarithmic corrections in $\hat{s}/p_\perp^2$. [...]
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2019-03-14
15:26
OpenAccess [PUBDB-2019-01546] Preprint/Report
et al
Conformal field theory and the hot phase of three-dimensional U(1) gauge theory
[arXiv:1903.00491; DESY-19-027]
 GO
We study the high-temperature phase of compact U(1) gauge theory in 2+1 dimensions, comparing the results of lattice calculations with analytical predictions from the conformal-field-theory description of the low-temperature phase of the bidimensional XY model. We focus on the two-point correlation functions of probe charges and the field-strength operator, finding excellent quantitative agreement with the functional form and the continuously varying critical indices predicted by conformal field theory..
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2019-03-14
13:47
arXiv [PUBDB-2019-01539] Report/Journal Article

$\Lambda_b^0$-baryon production in pp collisions in the general-mass variable-flavour-number scheme and comparison with CMS and LHCb data
[DESY-18-036; arXiv:1803.11103; MITP-18-020]
We calculate the next-to-leading-order cross section for the inclusive production of $\Lambda_b$ baryons in pp collisions in the general-mass variable-flavor-number scheme. We use realistic evolved non-perturbative fragmentation functions obtained from fits to B-meson production in $e^+ e^-$ annihilation and compare our results for transverse-momentum and rapidity distributions with recent experimental data from the CMS and the LHCb collaborations at the CERN LHC. [...]
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2019-03-14
11:38
OpenAccess [PUBDB-2019-01537] Report/Journal Article
et al
The $O(\alpha^2)$ Initial State QED Corrections to $e^+e^-$ Annihilation to a Neutral Vector Boson Revisited
[arXiv:1901.08018; DESY-18-226; DO-TH-18-30]
We calculate the non-singlet, the pure singlet contribution, and their interference term, at $O(\alpha^2)$ due to electron-pair initial state radiation to $e^+ e^-$ annihilation into a neutral vector boson in a direct analytic computation without any approximation. The correction is represented in terms of iterated incomplete elliptic integrals. [...]
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2019-03-05
14:46
OpenAccess [PUBDB-2019-01335] Preprint/Report
et al
Pseudorapidity distributions of charged hadrons in xenon-xenon collisions at $\sqrt{s_\mathrm{NN}} =$ 5.44 TeV
[arXiv:1902.03603; CMS-HIN-17-006; CERN-EP-2018-294]
 GO
Measurements of the pseudorapidity distributions of charged hadrons produced in xenon-xenon collisions at a nucleon-nucleon centre-of-mass energy of $\sqrt{s_\mathrm{NN}} =$ 5.44 TeV are presented. The measurements are based on data collected by the CMS experiment at the LHC. [...]
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2019-03-05
14:29
OpenAccess [PUBDB-2019-01334] Preprint/Report
et al
Combinations of single-top-quark production cross-section measurements and $|f_{\rm LV}V_{tb}|$ determinations at $\sqrt{s}=7$ and 8 TeV with the ATLAS and CMS experiments
[arXiv:1902.07158; CERN-EP-2019-005]
 GO
This paper presents the combinations of single-top-quark production cross-section measurements by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at $\sqrt{s}=7$ and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb$^{-1}$ at $\sqrt{s}=7$ TeV, and 12.2 to 20.3 fb$^{-1}$ at $\sqrt{s}=8$ TeV. These combinations are performed per centre-of-mass energy and for each production mode: $t$-channel, $tW$, and $s$-channel. [...]
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2019-03-04
14:54
OpenAccess [PUBDB-2019-01323] Report

Report on the Physics at the HL-LHC and Perspectives for the HE-LHC
[arXiv:1902.10229; CERN-LPCC-2019-01; CMS-FTR-19-001; ATL-PHYS-PUB-2019-006]
Seminar, Meeting location,
Contributions / Info
1377 pp. () [10.3204/PUBDB-2019-01323]  GO
Manuscript of volume 2 of the Yellow Report on the 'Workshop on the Physics of HL-LHC and perspectives at HE-LHC' containing the notes produced by the ATLAS and CMS collaborations as input to the Yellow Report volume 1..
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