Publications by Sara Celani | EPFL Graph Search

Lepton flavour universality tests and lepton flavour violation searches at LHCb

The Standard Model (SM) of particle physics represents our most fundamental knowledge of elementary particles and their interactions. One of the cardinal properties of the SM which has been thoroughly studied during the past years is the so-called Lepton F ...

Stichting SciPost2025

Momentum scale calibration of the LHCb spectrometer

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi, Luis Miguel Garcia Martin

For accurate determination of particle masses accurate knowledge of the momentum scale of the detectors is crucial. The procedure used to calibrate the momentum scale of the LHCb spectrometer is described and illustrated using the performance obtained with ...

Iop Publishing Ltd2024

Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the Ω0c Baryon

Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Vladimir Macko, Michel De Cian, Sebastian Schulte, Carina Trippl, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Aravindhan Venkateswaran, Dimitrios Kaminaris, Vitalii Lisovskyi

The first observation of the singly Cabibbo-suppressed 0c -> -K thorn and 0c -> -z thorn decays is reported, using proton -proton collision data at a center -of -mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1, collected with t ...

Amer Physical Soc2024

Helium identification with LHCb

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi

The identification of helium nuclei at LHCb is achieved using a method based on measurements of ionisation losses in the silicon sensors and timing measurements in the Outer Tracker drift tubes. The background from photon conversions is reduced using the R ...

Iop Publishing Ltd2024

Measurement of the D* longitudinal polarization in B0 →d*-τ+ντ decays

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Vitalii Lisovskyi, Luis Miguel Garcia Martin

The longitudinal polarization fraction of the D* meson is measured in B0→D*-τ+ντ decays, where the τ lepton decays to three charged pions and a neutrino, using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8 ...

American Physical Society2024

Measurement of associated J/ψ-ψ(2S) production cross-section in pp collisions at √s = 13 TeV

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi, Luis Miguel Garcia Martin

The cross-section of associated J/ψ-ψ(2S) production in proton-proton collisions at a centre-of-mass energy of (Formula presented.) TeV is measured using a data sample corresponding to an integrated luminosity of 4.2 fb−1, collected by the LHCb experiment. ...

Springer Nature2024

Multiplicity dependence of σψ(2S)/σJ/ψ in pp collisions at √s = 13 TeV

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi, Luis Miguel Garcia Martin

The ratio of production cross-sections of ψ(2S) over J/ψ mesons as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy s = 13 TeV is measured with a data sample collected by the LHCb detector, corresponding to ...

Springer Nature2024

Curvature-bias corrections using a pseudomass method

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi, Luis Miguel Garcia Martin

Momentum measurements for very high momentum charged particles, such as muons from electroweak vector boson decays, are particularly susceptible to charge-dependent curvature biases that arise from misalignments of tracking detectors. Low momentum charged ...

Iop Publishing Ltd2024

Measurement of the CKM angle γ in the B0→DK *0 channel using self-conjugate D→ KS0h+ h- decays

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Lino Ferreira Lopes, Surapat Ek-In, Vladimir Macko, Sebastian Schulte, Veronica Sølund Kirsebom, Carina Trippl, Sara Celani, Serhii Cholak, Elena Graverini, Maria Vieites Diaz, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Vitalii Lisovskyi, Luis Miguel Garcia Martin

A model-independent study of CP violation in B-0 -> DK (*0) decays is presented using data corresponding to an integrated luminosity of 9 fb(-1) collected by the LHCb experiment at centre-of-mass energies of v s = 7, 8 and 13TeV. The CKM angle. is determin ...

Springer2024

Amplitude Analysis of the B0 - K*0 μ+μ- Decay

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Michel De Cian, Sebastian Schulte, Veronica Sølund Kirsebom, Carina Trippl, Sara Celani, Serhii Cholak, Elena Graverini, Maria Vieites Diaz, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi, Luis Miguel Garcia Martin

An amplitude analysis of the B-0 -> K*(0) mu(+)mu(-) decay is presented using a dataset corresponding to an integrated luminosity of 4.7 fb(-1) of pp collision data collected with the LHCb experiment. For the first time, the coefficients associated to shor ...

Amer Physical Soc2024

Determination of short- and long-distance contributions in B0 →k∗0μ+μ- decays

Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi, Luis Miguel Garcia Martin

An amplitude analysis of the B0→K∗0μ+μ- decay is presented. The analysis is based on data collected by the LHCb experiment from proton-proton collisions at s=7, 8 and 13 TeV, corresponding to an integrated luminosity of 4.7 fb-1. For the first time, Wilson ...

American Physical Society2024

Measurement of forward charged hadron flow harmonics in peripheral PbPb collisions at √sNN = 5.02 TeV with the LHCb detector

Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi, Luis Miguel Garcia Martin

for the LHCb Collaboration.Flow harmonic coefficients, vn, which are the key to studying the hydrodynamics of the quark-gluon plasma (QGP) created in heavy-ion collisions, have been measured in various collision systems and kinematic regions and using vari ...

2024

Amplitude analysis of the Λb0→pK−γ decay

Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi, Luis Miguel Garcia Martin

The resonant structure of the radiative decay Λb0→pK−γ in the region of proton-kaon invariant-mass up to 2.5 GeV/c2 is studied using proton-proton collision data recorded at centre-of-mass energies of 7, 8, and 13 TeV collected with the LHCb detector, corr ...

Springer Nature2024

Observation of Ξb0→ Ξc + Ds- and Ξb0 c D- s decays

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Lino Ferreira Lopes, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Carina Trippl, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Vitalii Lisovskyi, Luis Miguel Garcia Martin

Springer2024

Observation of ᴧb0→ ᴧc+ D̄()0K− and ᴧb0→ ᴧc+ Ds− decays

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi, Luis Miguel Garcia Martin

The decays Λb 0→Λc +D¯(∗)0K- and Λb 0→Λc +Ds ∗- are observed for the first time, in proton-proton collision data at s=13TeV, corresponding to an integrated luminosity of 5.4fb-1 collected with the LHCb detector. Their ratios of branching fractions with res ...

2024

Measurement of CP Violation in B0 → ψ(→ l+ l-)KS0(→ π+ π-) Decays

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Lino Ferreira Lopes, Surapat Ek-In, Vladimir Macko, Sebastian Schulte, Veronica Sølund Kirsebom, Carina Trippl, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Vitalii Lisovskyi, Luis Miguel Garcia Martin

A measurement of time-dependent CP violation in the decays of B-0 and (B) over bar (0) mesons to the final states J/psi(-> mu(+) mu(-))K-S(0), psi(2S)(-> mu(+) mu(-))K-S(0) and J/psi(-> e(+)e(-))K-S(0) with K-S(0) -> pi(+)pi(-) is presented. The data corre ...

AMER PHYSICAL SOC2024

A measurement of ∆Γs

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi, Luis Miguel Garcia Martin

Using a dataset corresponding to 9 fb−1 of integrated luminosity collected with the LHCb detector between 2011 and 2018 in proton-proton collisions, the decay-time distributions of the decay modes Bs 0→J/ψη′ and Bs 0→J/ψπ+π− are studied. The decay-width di ...

Springer Nature2024

Erratum to: Search for CP violation in the phase space of D0 → π - π+π0 decays with the energy test

Aurelio Bay, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Lino Ferreira Lopes, Surapat Ek-In, Vladimir Macko, Sebastian Schulte, Veronica Sølund Kirsebom, Carina Trippl, Sara Celani, Serhii Cholak, Elena Graverini, Maria Vieites Diaz, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Vitalii Lisovskyi, Luis Miguel Garcia Martin

Springer Nature2024

Erratum to: Measurement of the Λc+ to D0 production ratio in peripheral PbPb collisions at sNN = 5.02 TeV(Journal Of High Energy Physics, (2023), 6, 10.1007/JHEP06(2023)132)

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Matthieu Philippe Luther Marinangeli, Lino Ferreira Lopes, Surapat Ek-In, Vladimir Macko, Ana Bárbara Rodrigues Cavalcante, Michel De Cian, Sebastian Schulte, Veronica Sølund Kirsebom, Carina Trippl, Sara Celani, Serhii Cholak, Elena Graverini, Maria Vieites Diaz, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel

We report on a measurement of the Λ+c to D0 production ratio in peripheral PbPb collisions at √ sNN = 5.02TeV with the LHCb detector in the forward rapidity region 2 < y < 4.5. The Λ+c (D0) hadrons are reconstructed via the decay channel Λ+c → pK−π+ (D0 → ...

2024

Production of η and η' mesons in pp and pPb collisions

Aurelio Bay, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Surapat Ek-In, Sebastian Schulte, Veronica Sølund Kirsebom, Sara Celani, Serhii Cholak, Elena Graverini, Ettore Zaffaroni, Donal Patrick Hill, Renato Quagliani, Elisabeth Maria Niel, Aravindhan Venkateswaran, Dimitrios Kaminaris, Radoslav Marchevski, Vitalii Lisovskyi, Luis Miguel Garcia Martin

The production of eta and eta' mesons is studied in proton -proton and proton -lead collisions collected with the LHCb detector. Proton -proton collisions are studied at center -of -mass energies of 5.02 and 13 TeV and proton -lead collisions are studied a ...

Amer Physical Soc2024