Lesya Shchutska

A study of the production of prompt mesons contained in jets in proton-proton collisions at is presented. The analysis is based on data corresponding to an integrated luminosity of 19.1 fb−1 collected with the CMS detector at the LHC. For events with at le ...

2020

Search for direct pair production of supersymmetric partners to the τ lepton in proton-proton collisions at \sqrts= 13 TeV

A search is presented for τ slepton pairs produced in proton–proton collisions at a center-of-mass energy of 13. The search is carried out in events containing two τ leptons in the final state, on the assumption that each τ slepton decays primarily to a τ ...

2020

Measurement of the cross section for tt¯ production with additional jets and b jets in pp collisions at s√ = 13 TeV

Aurelio Bay, Mikhail Chapochnikov, Guido Haefeli, Alexey Boyarsky, Hans Dijkstra, Sun Hee Kim, Alexandre Emmanuel Grandchamp, Oleg Ruchayskiy, Lesya Shchutska, Nikolaos Charitonidis, Jean-Loup Tastet, Sergei Smirnov, Anton Petrov, Inar Timiryasov, Maria Elena Stramaglia, Ana Bárbara Rodrigues Cavalcante, Federico Leo Redi, Elena Graverini, Ekaterina Kuznetsova

Measurements of the cross section for the production of top quark pairs in association with a pair of jets from bottom quarks and in association with a pair of jets from quarks of any flavor or gluons and their ratio are presented. The data were collected ...

Springer Nature2020

Constraints on the K-S(0) -> mu(+) mu(-) Branching Fraction

Aurelio Bay, Minh Tâm Tran, Tatsuya Nakada, Guido Haefeli, Olivier Schneider, Frédéric Blanc, Lesya Shchutska, Guillaume Max Pietrzyk, Matthieu Philippe Luther Marinangeli, Lino Ferreira Lopes, Violaine Bellée, Guido Andreassi, Plamen Hristov Hopchev, Pavol Stefko, Surapat Ek-In, Maria Elena Stramaglia, Vladimir Macko, Pietro Marino, Tara Nanut, Ana Bárbara Rodrigues Cavalcante, Federico Leo Redi, Michel De Cian, Sebastian Schulte, Veronica Sølund Kirsebom, Carina Trippl, Sara Celani, Serhii Cholak, Elena Graverini, Maria Vieites Diaz

A search for the decay K-S(0) -> mu(+) mu(-) is performed using proton-proton collision data, corresponding to an integrated luminosity of 5.6 fb(-1) and collected with the LHCb experiment during 2016, 2017, and 2018 at a center-of-mass energy of 13 TeV. T ...

AMER PHYSICAL SOC2020

Observation of New Xi(0)(c) Baryons Decaying to Lambda K-+(c)-

Christoph Frei, Peter Clarke, Aurelio Bay, Minh Tâm Tran, Marc-Olivier Bettler, François Fleuret, Tatsuya Nakada, Guido Haefeli, Niko Neufeld, Olivier Schneider, Hans Dijkstra, Frédéric Teubert, Gerhard Raven, Mingkui Wang, Frédéric Blanc, Matthew Needham, Lesya Shchutska, Liang Sun, Marco Guarise, Maxime Schubiger, Thibaud Humair, Xiaoqing Zhou, Hang Yin, Xiaoxue Han, Paolo Durante, Guillaume Max Pietrzyk, Matthieu Philippe Luther Marinangeli, Vladislav Balagura, Lino Ferreira Lopes, Zhirui Xu, Mark Tobin, Victor Coco, Violaine Bellée, Mirco Dorigo, Yu Zheng, Alexey Boldyrev, Simone Meloni, Maurizio Martinelli, Tommaso Colombo, Guido Andreassi, Maxim Borisyak, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

The experimental facility for the Search for Hidden Particles at the CERN SPS

The Search for Hidden Particles (SHiP) Collaboration has shown that the CERN SPS accelerator with its 400 GeV/c proton beam offers a unique opportunity to explore the Hidden Sector [1-3]. The proposed experiment is an intensity frontier experiment which is ...

2019

Probing new physics with displaced vertices: Muon tracker at CMS

Alexey Boyarsky, Oleg Ruchayskiy, Lesya Shchutska, Kyrylo Bondarenko

Long-lived particles can manifest themselves at the LHC via "displaced vertices"-several charged tracks originating from a position separated from the proton interaction point by a macroscopic distance. Here we demonstrate the potential of the muon tracker ...

American Physical Society2019

Fast simulation of muons produced at the SHiP experiment using Generative Adversarial Networks

Sebastian Gerlach, Aurelio Bay, Mikhail Chapochnikov, Guido Haefeli, Alexey Boyarsky, Hans Dijkstra, Sun Hee Kim, Alexandre Emmanuel Grandchamp, Oleg Ruchayskiy, Lesya Shchutska, Nikolaos Charitonidis, Jean-Loup Tastet, Sergei Smirnov, Anton Petrov, Inar Timiryasov, Maria Elena Stramaglia, Ana Bárbara Rodrigues Cavalcante, Federico Leo Redi, Elena Graverini, Ekaterina Kuznetsova

This paper presents a fast approach to simulating muons produced in interactions of the SPS proton beams with the target of the SHiP experiment. The SHIP experiment will be able to search for new long-lived particles produced in a 400 GeV/c SPS proton beam ...

2019

Sensitivity of the SHiP experiment to Heavy Neutral Leptons

Florian Maria Wurm, Aurelio Bay, Mikhail Chapochnikov, Guido Haefeli, Alexey Boyarsky, Hans Dijkstra, Sun Hee Kim, Oleg Ruchayskiy, Nathalie Sophie Adeline Serra, Lesya Shchutska, Adriano Pastore, Nikolaos Charitonidis, Johannes Richard Cornelis Geerit Kruis, Erica Manfredi, Sargis Hakobyan, Eirini Koukovini Platia, Jean-Loup Tastet, Sergei Smirnov, Anton Petrov, Inar Timiryasov, Maria Elena Stramaglia, Federico Leo Redi, Elena Graverini, Ekaterina Kuznetsova

Heavy Neutral Leptons (HNLs) are hypothetical particles predicted by many extensions of the Standard Model. These particles can, among other things, explain the origin of neutrino masses, generate the observed matter-antimatter asymmetry in the Universe an ...

Springer Nature2019

The active muon shield in the SHiP experiment

Sebastian Gerlach, Aurelio Bay, Mikhail Chapochnikov, Alexey Boyarsky, Hans Dijkstra, Sun Hee Kim, Oleg Ruchayskiy, Lesya Shchutska, Sergei Smirnov, Inar Timiryasov, Federico Leo Redi, Elena Graverini, Ekaterina Kuznetsova

The SHiP experiment is designed to search for very weakly interacting particles beyond the Standard Model which are produced in a 400 GeV/c proton beam dump at the CERN SPS. An essential task for the experiment is to keep the Standard Model background leve ...

2017

A facility to search for hidden particles at the CERN SPS: the SHiP physics case

Mikhail Chapochnikov, Anurag Tripathi, Alexey Boyarsky, Oleg Ruchayskiy, Lesya Shchutska, Marco Drewes, Shintaro Eijima, Kyrylo Bondarenko

This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (search for hidden particles) experiment is intended to hunt for new physics in the largely unexplored domain of very weakly interacting particles with masses below ...

Institute of Physics2016

Observation of the rare B-s(0)->mu(+)mu(-) decay from the combined analysis of CMS and LHCb data

Horst Vogel, Christoph Frei, Peter Clarke, Jean Wicht, Alessandro Mapelli, Aurelio Bay, Minh Tâm Tran, Andrea Rizzi, Marc-Olivier Bettler, Cédric Potterat, Matthias Finger, Tatsuya Nakada, Guido Haefeli, Niko Neufeld, Olivier Schneider, Pierre Jaton, Hans Dijkstra, Julien Rouvinet, Charles Dietz, João Miguel das Neves Duarte, Frédéric Guillaume Dupertuis, Frédéric Teubert, Gerhard Raven, Quentin Python, Bastien Luca Muster, Joo Yeon Kim, Alexis Kalogeropoulos, Chitsanu Khurewathanakul, Frédéric Blanc, Matthew Needham, Lesya Shchutska, Liang Sun, Alexandre Aubin, Yixing Chen, Tian Cheng, Ioannis Papadopoulos, Wei Sun, Barinjaka Rakotomiaramanana, Xiaoxue Han, Qian Wang, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

Development of the Electromagnetic Calorimeter for the Precise Measurement of the Cosmic Ray Positron Fraction with PEBS

Since almost a century ago, it is known that a quarter of the energy density in the Universe is represented by the dark matter which has been seen only through gravitational interaction. Despite of intensive searches for a dark matter constituent in differ ...

EPFL2012

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A search for the decays B-s(0) -> e(+)e(-) and B-0 e(+)e(-) is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to integrated luminosities of 1, 2, and 2 fb(-1 ...

AMER PHYSICAL SOC2020

Luis Miguel Garcia Martin

Giovanni Carboni

Zheng Wang

Katharina Müller

A study of the lineshape of the chi(c1) (3872) state is made using a data sample corresponding to an integrated luminosity of 3 fb(-1) collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate chi(c1)(3872) and ...

American Physical Society2020

Pavol Stefko

Ho Ling Li

Surapat Ek-In

Luis Miguel Garcia Martin

Giovanni Carboni

Zheng Wang

Katharina Müller

A study of prompt charm-hadron pair production in proton-lead collisions at root s(NN) = 8.16 TeV is performed using data corresponding to an integrated luminosity of about 30 nb(-1), collected with the LHCb experiment. Production cross sections for differ ...

AMER PHYSICAL SOC2020

The first observation of the decay B-0 -> D-0(D) over bar K-0(+)pi(-) is reported using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb(-1) collected by the LHCb experiment in 2011, 2012 and 2016. The measurement is perform ...

American Physical Society2020

Maxim Borisyak

Luis Miguel Garcia Martin

Giovanni Carboni

Zheng Wang

Katharina Müller

The decays B+-> J/psi pi(+)pi(-)K(+)are studied using a data set corresponding to an integrated luminosity of 9 fb(-1)collected with the LHCb detector in proton-proton collisions between 2011 and 2018. Precise measurements of the ratios of branching fracti ...

Springer Nature2020