arXiv subjects

Boris Tuchming

Publications and source records attributed to Boris Tuchming.

10 recordsLinked to original sources

arXiv2024

Dual-Mode Calorimetric Superconducting Nanowire Single Photon Detectors

A dual-operation mode SNSPD is proposed. In the conventional Geiger mode, the sensor operates at temperatures well below the critical temperature, Tc, working as an event counter without sensitivity to the number of photons impinging the sensor. In the calorimetric mode, the detector is operated at temperatures just below TC and displays calorimetric sensitivity in the range of 15 to 250 absorbed-photon energy equivalent for a photon beam with a wavelength of 515 nm. In this energy sensitive mode, photon absorption causes Joule heating of the SNSPD that becomes partially resistive without the presence of latching. Depending on the application, by tuning the sample temperature and bias current using the same readout system, the SNSPD can readily switch between the two modes. In the calorimetric mode, SNSPD recovery times shorter than the ones in the Geiger mode are observed, reaching values as low as 560 ps. Dual-mode SNSPDs may provide significant advancements in spectroscopy and calorimetry, where precise timing, photon counting and energy resolution are required.

physics.ins-det↗

arXiv2023

Compatibility and combination of world W-boson mass measurements

The compatibility of W-boson mass measurements performed by the ATLAS, LHCb, CDF, and D0 experiments is studied using a coherent framework with theory uncertainty correlations. The measurements are combined using a number of recent sets of parton distribution functions (PDF), and are further combined with the average value of measurements from the Large Electron-Positron collider. The considered PDF sets generally have a low compatibility with a suite of global rapidity-sensitive Drell-Yan measurements. The most compatible set is CT18 due to its larger uncertainties. A combination of all mW measurements yields a value of mW = 80394.6 +- 11.5 MeV with the CT18 set, but has a probability of compatibility of 0.5% and is therefore disfavoured. Combinations are performed removing each measurement individually, and a 91% probability of compatibility is obtained when the CDF measurement is removed. The corresponding value of the W boson mass is 80369.2 +- 13.3 MeV, which differs by 3.6 sigma from the CDF value determined using the same PDF set.

hep-ex↗

arXiv2022

AnaBHEL (Analog Black Hole Evaporation via Lasers) Experiment: Concept, Design, and Status

Accelerating relativistic mirror has long been recognized as a viable setting where the physics mimics that of black hole Hawking radiation. In 2017, Chen and Mourou proposed a novel method to realize such a system by traversing an ultra-intense laser through a plasma target with a decreasing density. An international AnaBHEL (Analog Black Hole Evaporation via Lasers) Collaboration has been formed with the objectives of observing the analog Hawking radiation and shedding light on the information loss paradox. To reach these goals, we plan to first verify the dynamics of the flying plasma mirror and to characterize the correspondence between the plasma density gradient and the trajectory of the accelerating plasma mirror. We will then attempt to detect the analog Hawking radiation photons and measure the entanglement between the Hawking photons and their "partner particles". In this paper, we describe our vision and strategy of AnaBHEL using the Apollon laser as a reference, and we report on the progress of our R&D of the key components in this experiment, including the supersonic gas jet with a graded density profile, and the superconducting nanowire single-photon Hawking detector. In parallel to these hardware efforts, we performed computer simulations to estimate the potential backgrounds, and derive analytic expressions for modifications to the blackbody spectrum of Hawking radiation for a perfectly reflecting, point mirror, due to the semit-ransparency and finite-size effects specific to flying plasma mirrors. Based on this more realistic radiation spectrum, we estimate the Hawking photon yield to guide the design of the AnaBHEL experiment, which appears to be achievable.

gr-qc↗

arXiv2018

Recent Top quark results from the Tevatron

We present recent measurements on top quark physics obtained at the Fermilab Tevatron $p\bar p$ collider by the CDF and D0 collaborations. We discuss the measurements of the top quark mass using direct and indirect methods of extraction, the forward-backward production asymmetries, and the top quark polarization.

hep-ex↗

arXiv2017

Recent results from D0 and recent Tevatron combinations

We discuss recent results obtained by the D0 experiment at the Fermilab Tevatron $p\bar p$ collider and recent combinations of CDF and D0 measurements. Regarding the top quark mass, we present recent measurements obtained at D0, the final Run~I+Run~II D0 combination, as well as the preliminary Run~I+Run~II CDF+D0 combination. We also discuss the combination of the CDF+D0 measurements of the $p\bar p \to t\bar t$ forward-backward asymmetry. We present the first measurement of the direct CP-violating charge asymmetry in $B^\pm$ mesons decaying to $μ^\pm D^{0} X$, and discuss the status of the recent evidence for a four-flavor tetraquark state seen at D0.

hep-ex↗

arXiv2015

Measuremements of the top-quark mass and polarization at the Tevatron

We present the most recent and sensitive measurements of the top quark mass, performed by the Tevatron experiments, D0 and CDF, using ppbar collision data at sqrt(s) = 1.96 TeV. We also present the first measurement of the top quark polarization at Tevatron, obtained by the D0 Collaboration in the dilepton channels.

hep-ex↗

arXiv2014

Higgs boson production and properties at the Tevatron

We present the searches for the Standard Model Higgs boson, using the full Run II dataset of the Fermilab Tevatron $p\bar p$ collider, collected with the CDF and DØ detectors. A significant excess of events is observed, consistent with the presence of a Standard Model Higgs boson of mass 125 GeV. We also present tests of different spin/parity hypotheses, performed in the $VH \to V b\bar b$ channels at DØ, and new searches in invisible modes conducted at CDF.

hep-ex↗

arXiv2013

Tevatron Higgs results

We present the combination of searches for the Standard Model Higgs boson, using up to 10 \invfb\ of $p\bar p$ collisions at $\sqrts$=1.96 TeV collected with the CDF and \dzero\ detectors at the Fermilab Tevatron collider. The major contributing channels are optimized for the main production modes, the associated production with a vector boson ($VH$, with $V=W,Z$), the vector boson fusion, and the gluon-gluon fusion, and the different decay modes $H\to b\bar b$, $H\toτ^+τ^-$, $H\to W^+W^-$, and $H\to γγ$. A significant excess of events is observed in the mass range $115<M_H<140 \gev$. The local significance corresponds to 3.0 standard deviations at $m_H=125 \gev$, consistent with the mass of the new particle observed at the LHC. The observed signal strengths in all channels are consistent with the presence of a standard model Higgs boson of mass 125 \gev. We also present prospects for spin/parity tests to be performed in the $VH \to V b\bar b$ channels.

hep-ex↗

arXiv2013

Spin/parity of Higgs-like particle at D0

We present prospects for tests of different spin and parity hypotheses for a particle $H$ of mass 125 GeV produced in association with a vector boson and decaying into a pair of b-quarks. We use the combined analysis of the WH->lvbb, ZH->llbb, and ZH-> vvbb channels based on the full Run II dataset collected at $\sqrt s=1.96$ TeV with the \dzero\ detector at the Fermilab Tevatron collider.

hep-ex↗

arXiv2007

Top physics at the Tevatron Run 2

The $p\bar p$ collider Tevatron, with its high center of mass energy of 2 TeV is presently the unique top quark factory in the world. Thousands of top-quarks have been produced during Run IIa. This gives the opportunity to study the production and the properties of the heaviest known fundamental particle. This article will summarize a sample of recent top quark physics results obtained at the Tevatron.

hep-ex↗