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The Preprints collection aims to cover as far as possible all the grey literature in particle physics and its related technologies. The collection contains something like 400,000 documents, out of which about 50% can be accessed electronically. The documents originate from a variety of institutes all over the world. The collection, currently available, starts in 1979 and it has a full coverage of the arXiv.org e-Print archive since its beginning in 1991.
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2026-05-21
11:57
Search for pair production of additional neutral scalars within the Inert Doublet Model in a final state with two electrons or two muons in proton-proton collisions at $ \sqrt{s} = $ 13 and 13.6 TeV
A first dedicated search for pair production of new scalars predicted by the Inert Doublet Model is performed using proton-proton collisions. [...]
CERN-EP-2026-098 ; CMS-NPS-25-002-003. - 2026
Additional information for the analysis - CMS AuthorList - Fulltext

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2026-05-20
19:55
Moving tons of fragile crystals with care: the CMS ECAL Enfourneur2 project / Bianco, Roberta (INFN, Rome)
The CMS experiment at the CERN Large Hadron Collider features a high-precision electromagnetic calorimeter (ECAL) made of 61,200 lead tungstate crystals in its central (barrel) part. The crystals are both heavy and fragile, requiring extreme care during handling. [...]
CMS-CR-2026-059.- Geneva : CERN, 2026 - 4 p. Fulltext: PDF;
In : International Particle Accelerator Conference (IPAC'26), Deauville, France, 17-22 May 2026

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2026-05-20
14:05
Background Particle Response of CMS GEM Detectors with Run 3 Data and Simulation / Sheokand, Tanvi (Panjab U.) /CMS Collaboration
The upgrade of the High-Luminosity LHC (HL-LHC) will boost the instantaneous luminosity to 5-7 $\times$ 10$^{34}$ cm$^{-2}$s$^{-1}$, increasing particle fluxes in the forward region of the CMS detector. High particle fluxes can damage electronics and induce spurious signals. [...]
CMS-CR-2026-054.- Geneva : CERN, 2026 - 5 p. Fulltext: PDF;
In : 7th International Conference on Technology and Instrumentation for Particle Physics, Mumbai, In, 2 - 6 Feb 2026

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2026-05-20
13:55
New measurements of single top and $\mathrm{t \bar{t}}$ production at ATLAS and CMS / Jeppe, Laurids (CERN) /ATLAS and CMS Collaborations
Recent measurements of single top and $\mathrm{t \bar{t}}$ production at the ATLAS and CMS experiments are summarized. Topics covered are a measurement of $t$-channel single top production at $\sqrt{s} = 5.02\,\mathrm{TeV}$, differential $t$-channel cross sections at $\sqrt{s} = 13\,\mathrm{TeV}$, $\mathrm{WbW\bar{b}}$ differential cross sections in the dilepton and lepton+jets channels probing on- and off-shell top contributions, the most precise inclusive $\mathrm{t \bar{t}}$ cross section measurement to date, the first observation of $\mathrm{t \bar{t}}$ production in PbPb collisions at $\sqrt{s_\mathrm{NN}}} = 5.36\,\mathrm{TeV}$, a combined ATLAS+CMS measurement of the $\mathrm{t \bar{t}}$ spin-correlation observable $\Delta \varphi_{\ell\ell}$, and a characterization of the quantum state of the $\mathrm{t \bar{t}}$ system based on the spin density matrix..
CMS-CR-2026-046.- Geneva : CERN, 2026 - 5 p. Fulltext: PDF;
In : 60th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, It, 22 - 29 Mar 2026

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2026-05-20
13:34
Study of the thermodynamic properties of hot QCD matter in the CMS experiment / Bernardes, Cesar Augusto (SAO_PAULO) /CMS Collaboration
These proceedings summarize recent CMS measurements at the LHC that extract the squared speed of sound, \(c_s^2\), of strongly interacting matter at extreme temperatures from the multiplicity dependence of the mean transverse momentum in ultra-central lead-lead (PbPb) collisions at \(\sqrt{s_{\mathrm{NN}}} = 5.02\ \mathrm{TeV}\). The analysis yields \(c_s^2 = 0.241 \pm 0.002\, (\mathrm{stat}) \pm 0.016\, (\mathrm{syst})\) at an effective temperature of \(T_{\mathrm{eff}} = 219 \pm 8\, (\mathrm{syst})\ \mathrm{MeV}\), in good agreement with lattice-QCD calculations. [...]
CMS-CR-2026-023.- Geneva : CERN, 2026 - 9 p. Fulltext: PDF;
In : Advances in QCD at the LHC and the EIC, Rio De Janeiro, Br, 10 - 13 Nov 2025

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2026-05-20
08:58
Matching and Power Coupling / Burt, Graeme (Cockcroft Inst. Accel. Sci. Tech.)
A key factor in any RF system is the mechanism for coupling the RF power from an amplifier into an accelerating cavity. [...]
arXiv:2605.18526. - 2026 - 13.
Fulltext

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2026-05-20
07:46
Search for soft unclustered energy patterns containing muons in the final state in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
Soft unclustered energy patterns (SUEPs) refer to high-multiplicity, isotropic distributions of low-momentum particles that could arise in strongly-coupled hidden sector theories. [...]
CERN-EP-2026-148. - 2026
Fulltext - Previous draft version

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2026-05-20
04:29
Search for the nonresonant production of a pair of additional Higgs bosons in the Type-X two-Higgs-doublet model in proton-proton collisions at $\sqrt{s}$ = 13 TeV / CMS Collaboration
A search is presented for the production of two additional Higgs bosons from an off-shell Z boson, where both additional particles decay to $τ$ lepton pairs. [...]
arXiv:2605.16655 ; CMS-SUS-23-007 ; CERN-EP-2025-028. - 35.
Fulltext

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2026-05-20
04:23
Flavour Changing Neutral Current decays at LHCb / Langenbruch, Christoph (Heidelberg U.)
Flavour Changing Neutral Current (FCNC) decays are forbidden at lowest perturbative order in the Standard Model (SM) and only allowed via quantum loops. [...]
arXiv:2605.18084. - 6.
Fulltext

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2026-05-19
13:12
Hot QCD matter probed via measurements of the speed of sound with CMS / Padula, Sandra (SAO_PAULO) /CMS Collaboration
A hot and dense quark-gluon medium is observed to be created in ultrarelativistic nuclear collisions, exhibiting striking collective flow behavior, with fluid-like properties well described by relativistic hydrodynamics, with minimal viscous dissipation. The characteristics of this medium are under intense investigation, and in particular, its thermodynamical properties. [...]
CMS-CR-2026-045.- Geneva : CERN, 2026 - 12 p. Fulltext: PDF;
In : 53rd International Symposium on Multiparticle Dynamics (ISMD) 2025, Corfu, Greece, 21 - 28 Sep 2025

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