W. Krzemień

activity

20082026

J / ψ p

resonances consistent with pentaquark states in

Λ_{b}^{0} \to J / ψ K^{-} p

decays

1.3k citations · 19.6k across the 441 of their papers we have counts for

collaborators

Showing 2015Show all

34 papers · 1 filter

nucl-ex2015★ 4 cited

Search for the eta-mesic Helium bound state with the WASA-at-COSY facility

M. Skurzok, W. Krzemien, O. Rundel +1

We performed a search for 4He-eta bound state with high statistics and high acceptance with the WASA-at-COSY facility using a ramped beam technique. The signature of eta-mesic nucl…

nucl-ex2015★ 66 cited

K $^{-}$ absorption on two nucleons and ppK $^{-}$ bound state search in the $Σ^{0}$ p final state

O. Vazquez Doce, L. Fabbietti, M. Cargnelli +18

We report the measurement of K $^{-}$ absorption processes in the $Σ^{0}$ p final state and the first exclusive measurement of the two nucleon absorption (2NA) with the KLOE detector. Th…

hep-ex2015★ 133 cited

Measurement of forward $W$ and $Z$ boson production in $pp$ collisions at $s = 8 Te V$

LHCb collaboration, R. Aaij, C. Abellán Beteta +730

Measurements are presented of electroweak boson production using data from $pp$ collisions at a centre-of-mass energy of $s = 8 Te V$ . The analysis is…

hep-ex2015★ 126 cited

Limit on the production of a low-mass vector boson in $e^{+} e^{-} \to U γ$ , $U \to e^{+} e^{-}$ with the KLOE experiment

A. Anastasi, D. Babusci, G. Bencivenni +61

The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We se…

hep-ex2015★ 58 cited

Production of associated $Υ$ and open charm hadrons in $pp$ collisions at $s = 7$ and $8$ TeV via double parton scattering

LHCb collaboration, R. Aaij, C. Abellán Beteta +724

Associated production of bottomonia and open charm hadrons in $pp$ collisions at $s = 7$ and $8$ TeV is observed using data corresponding to an integrated luminosity of 3$fb^{-…

hep-ex2015★ 30 cited

Evidence for the strangeness-changing weak decay $Ξ_{b}^{-} \to Λ_{b}^{0} π^{-}$

LHCb collaboration, R. Aaij, C. Abellán Beteta +724

Using a $pp$ collision data sample corresponding to an integrated luminosity of 3.0~fb $^{- 1}$ , collected by the LHCb detector, we present the first search for the strangeness-chang…

hep-ex2015★ 46 cited

A model-independent confirmation of the $Z (4430)^{-}$ state

LHCb collaboration, R. Aaij, B. Adeva +723

The decay $B^{0} \to ψ (2 S) K^{+} π^{-}$ is analyzed using $3 f b^{- 1}$ of $pp$ collision data collected with the LHCb detector. A model-independent description of the $ψ (2 S) π$ mass spe…

hep-ex2015★ 175 cited

Measurements of prompt charm production cross-sections in $pp$ collisions at $s = 13 TeV$

LHCb collaboration, R. Aaij, C. Abellán Beteta +724

Production cross-sections of prompt charm mesons are measured with the first data from $pp$ collisions at the LHC at a centre-of-mass energy of $13 TeV$ . The data sample…

nucl-ex2015★ 18 cited

Measurements of Branching Ratios for $η$ Decays into Charged Particles

P. Adlarson, W. Augustyniak, W. Bardan +96

The WASA-at-COSY experiment has collected $3 \times 1 0^{7}$ events with $η$ -mesons produced via the reaction $p d \to^{3} He η$ at $T = 1.0 GeV$ . Usi…

physics.ins-det2015★ 6 cited

Searches for discrete symmetries violation in ortho-positronium decay using the J-PET detector

D. Kamińska, T. Bednarski, P. Białas +24

In this paper we present prospects for using the J-PET detector to search for discrete symmetries violations in a purely leptonic system of the positronium atom. We discuss tests o…

hep-ex2015★ 49 cited

Forward production of $Υ$ mesons in $pp$ collisions at $s = 7$ and 8TeV

LHCb collaboration, R. Aaij, B. Adeva +720

The production of $Υ$ mesons in $pp$ collisions at $= 7$ and $8 TeV$ is studied with the LHCb detector using data samples corresponding to an integrated luminosity of…

hep-ex2015★ 71 cited

First measurement of the differential branching fraction and $C P$ asymmetry of the $B^{\pm} \to π^{\pm} μ^{+} μ^{-}$ decay

LHCb collaboration, R. Aaij, B. Adeva +723

The differential branching fraction with respect to the dimuon invariant mass squared, and the $C P$ asymmetry of the $B^{\pm} \to π^{\pm} μ^{+} μ^{-}$ decay are measured for the first time.…

q-bio.OT2015★ 15 cited

Studies of unicellular micro-organisms Saccharomyces cerevisiae by means of Positron Annihilation Lifetime Spectroscopy

E. Kubicz, B. Jasińska, B. Zgardzińska +26

Results of Positron Annihilation Lifetime Spectroscopy (PALS) and microscopic studies on simple microorganisms: brewing yeasts are presented. Lifetime of ortho - positronium (o-Ps)…

physics.ins-det2015★ 9 cited

Reconstruction of hit-time and hit-position of annihilation quanta in the J-PET detector using the Mahalanobis distance

N. G. Sharma, M. Silarski, T. Bednarski +24

The J-PET detector being developed at Jagiellonian University, is a Positron Emission Tomograph composed of the long strips of polymer scintillators. At the same time it is a detec…

physics.ins-det2015★ 4 cited

PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix

A. Wieczorek, B. Zgardzińska, B. Jasińska +25

The polystyrene dopped with 2,5-diphenyloxazole as a primary fluor and 2-(4-styrylphenyl)benzoxazole as a wavelength shifter, prepared as a plastic scintillator was investigated us…

physics.ins-det2015★ 5 cited

Processing optimization with parallel computing for the J-PET tomography scanner

W. Krzemień, M. Bała, T. Bednarski +27

The Jagiellonian-PET (J-PET) collaboration is developing a prototype TOF-PET detector based on long polymer scintillators. This novel approach exploits the excellent time propertie…

physics.ins-det2015★ 2 cited

Application of the Compress Sensing Theory for Improvement of the TOF Resolution in a Novel J-PET Instrument

L. Raczynski, P. Moskal, P. Kowalski +24

Nowadays, in Positron Emission Tomography (PET) systems, a Time of Flight information is used to improve the image reconstruction process. In Time of Flight PET (TOF-PET), fast det…

hep-ex2015★ 26 cited

Measurement of the time-integrated $C P$ asymmetry in $D^{0} \to K_{S}^{0} K_{S}^{0}$ decays

LHCb collaboration, R. Aaij, B. Adeva +722

The time-integrated $C P$ asymmetry in the decay $D^{0} \to K_{S}^{0} K_{S}^{0}$ is measured using $3 f b^{- 1}$ of proton-proton collision data collected by the LHCb experiment at centre-of-ma…

hep-ex2015★ 157 cited

Search for hidden-sector bosons in $B^{0} \to K^{* 0} μ^{+} μ^{-}$ decays

LHCb collaboration, R. Aaij, B. Adeva +724

A search is presented for hidden-sector bosons, $χ$ , produced in the decay $B^{0} \to K^{*} (892)^{0} χ$ , with $K^{*} (892)^{0} \to K^{+} π^{-}$ and $χ \to μ^{+} μ^{-}$ . The search is performed u…

physics.ins-det2015★ 20 cited

Overview of the software architecture and data flow for the J-PET tomography device

W. Krzemien, D. Alfs, P. Bialas +19

Modern TOF-PET scanner systems require high-speed computing resources for efficient data processing, monitoring and image reconstruction. In this article we present the data flow a…

hep-ex2015★ 1.3k cited

Observation of $J / ψ p$ resonances consistent with pentaquark states in $Λ_{b}^{0} \to J / ψ K^{-} p$ decays

LHCb collaboration, R. Aaij, B. Adeva +720

Observations of exotic structures in the $J / ψ p$ channel, that we refer to as pentaquark-charmonium states, in $Λ_{b}^{0} \to J / ψ K^{-} p$ decays are presented. The data sample corresponds…

hep-ex2015★ 35 cited

$B$ flavour tagging using charm decays at the LHCb experiment

LHCb collaboration, R. Aaij, B. Adeva +725

An algorithm is described for tagging the flavour content at production of neutral $B$ mesons in the LHCb experiment. The algorithm exploits the correlation of the flavour of a $B$ …

nucl-ex2015★ 5 cited

Search for eta-mesic nuclei with WASA-at-COSY

Wojciech Krzemien, Pawel Moskal, Magdalena Skurzok

We search for an evidence of eta-mesic He with the WASA detector. Two dedicated experiments were performed at the Cooler Synchrotron COSY-Juelich. The experimental method is based…

physics.med-ph2015★ 12 cited

3D PET image reconstruction based on Maximum Likelihood Estimation Method (MLEM) algorithm

Artur Słomski, Zbigniew Rudy, Tomasz Bednarski +23

Positron emission tomographs (PET) do not measure an image directly. Instead, they measure at the boundary of the field-of-view (FOV) of PET tomograph a sinogram that consists of m…

Search for the eta-mesic Helium bound state with the WASA-at-COSY facility

K− absorption on two nucleons and ppK− bound state search in the Σ0p final state

Measurement of forward W and Z boson production in pp collisions at s​=8TeV

Limit on the production of a low-mass vector boson in e+e−→Uγ, U→e+e− with the KLOE experiment

Production of associated Υ and open charm hadrons in pp collisions at s​=7 and 8TeV via double parton scattering

Evidence for the strangeness-changing weak decay Ξb−​→Λb0​π−

A model-independent confirmation of the Z(4430)− state

Measurements of prompt charm production cross-sections in pp collisions at s​=13TeV

Measurements of Branching Ratios for η Decays into Charged Particles

Searches for discrete symmetries violation in ortho-positronium decay using the J-PET detector

Forward production of Υ mesons in pp collisions at s​=7 and 8TeV

First measurement of the differential branching fraction and CP asymmetry of the B±→π±μ+μ− decay

Studies of unicellular micro-organisms Saccharomyces cerevisiae by means of Positron Annihilation Lifetime Spectroscopy

Reconstruction of hit-time and hit-position of annihilation quanta in the J-PET detector using the Mahalanobis distance

PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix

Processing optimization with parallel computing for the J-PET tomography scanner

Application of the Compress Sensing Theory for Improvement of the TOF Resolution in a Novel J-PET Instrument

Measurement of the time-integrated CP asymmetry in D0→KS0​KS0​ decays

Search for hidden-sector bosons in B0→K∗0μ+μ− decays

Overview of the software architecture and data flow for the J-PET tomography device

Observation of J/ψp resonances consistent with pentaquark states in Λb0​→J/ψK−p decays

B flavour tagging using charm decays at the LHCb experiment

Search for eta-mesic nuclei with WASA-at-COSY

3D PET image reconstruction based on Maximum Likelihood Estimation Method (MLEM) algorithm

K $^{-}$ absorption on two nucleons and ppK $^{-}$ bound state search in the $Σ^{0}$ p final state

Measurement of forward $W$ and $Z$ boson production in $pp$ collisions at $s = 8 Te V$

Limit on the production of a low-mass vector boson in $e^{+} e^{-} \to U γ$ , $U \to e^{+} e^{-}$ with the KLOE experiment

Production of associated $Υ$ and open charm hadrons in $pp$ collisions at $s = 7$ and $8$ TeV via double parton scattering

Evidence for the strangeness-changing weak decay $Ξ_{b}^{-} \to Λ_{b}^{0} π^{-}$

A model-independent confirmation of the $Z (4430)^{-}$ state

Measurements of prompt charm production cross-sections in $pp$ collisions at $s = 13 TeV$

Measurements of Branching Ratios for $η$ Decays into Charged Particles

Forward production of $Υ$ mesons in $pp$ collisions at $s = 7$ and 8TeV

First measurement of the differential branching fraction and $C P$ asymmetry of the $B^{\pm} \to π^{\pm} μ^{+} μ^{-}$ decay

Measurement of the time-integrated $C P$ asymmetry in $D^{0} \to K_{S}^{0} K_{S}^{0}$ decays

Search for hidden-sector bosons in $B^{0} \to K^{* 0} μ^{+} μ^{-}$ decays

Observation of $J / ψ p$ resonances consistent with pentaquark states in $Λ_{b}^{0} \to J / ψ K^{-} p$ decays

$B$ flavour tagging using charm decays at the LHCb experiment