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Book ; Online: Stable and Semi-stable Sampling Approaches for Continuously Used Samples

Astrakhantsev, Nikita / Chittajallu, Deepak / Kaushal, Nabeel / Mokeev, Vladislav

2022

Abstract: Information retrieval systems are usually measured by labeling the relevance of results corresponding to a sample of user queries. In practical search engines, such measurement needs to be performed continuously, such as daily or weekly. This creates a ... ...

Abstract	Information retrieval systems are usually measured by labeling the relevance of results corresponding to a sample of user queries. In practical search engines, such measurement needs to be performed continuously, such as daily or weekly. This creates a trade-off between (a) representativeness of query sample to current query traffic of the product; (b) labeling cost: if we keep the same query sample, results would be similar allowing us to reuse their labels; and (c) overfitting caused by continuous usage of same query sample. In this paper we explicitly formulate this tradeoff, propose two new variants -- Stable and Semi-stable -- to simple and weighted random sampling and show that they outperform existing approaches for the continuous usage settings, including monitoring/debugging search engine or comparing ranker candidates.
Keywords	Computer Science - Information Retrieval ; Computer Science - Machine Learning
Publishing date	2022-03-02
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Ratio between Lactobacillus plantarum and Acetobacter pomorum on the surface of Drosophila melanogaster adult flies depends on cuticle melanisation.

Mokeev, Vladislav / Flaven-Pouchon, Justin / Wang, Yiwen / Gehring, Nicole / Moussian, Bernard

BMC research notes

2021 Volume 14, Issue 1, Page(s) 351

Abstract: Objectives: As in most organisms, the surface of the fruit fly Drosophila melanogaster is associated with bacteria. To examine whether this association depends on cuticle quality, we isolated and quantified surface bacteria in normal and melanized flies ...

Abstract	Objectives: As in most organisms, the surface of the fruit fly Drosophila melanogaster is associated with bacteria. To examine whether this association depends on cuticle quality, we isolated and quantified surface bacteria in normal and melanized flies applying a new and simple protocol. Results: On wild flies maintained in the laboratory, we identified two persistently culturable species as Lactobacillus plantarum and Acetobacter pomorum by 16S rDNA sequencing. For quantification, we showered single flies for DNA extraction avoiding the rectum to prevent contamination from the gut. In quantitative PCR analyses, we determined the relative abundance of these two species in surface wash samples. On average, we found 17-times more A. pomorum than L. plantarum. To tentatively study the importance of the cuticle for the interaction of the surface with these bacteria, applying Crispr/Cas9 gene editing in the initial wild flies, we generated flies mutant for the ebony gene needed for cuticle melanisation and determined the L. plantarum to A. pomorum ratio on these flies. We found that the ratio between the two bacterial species reversed on ebony flies. We hypothesize that the cuticle chemistry is crucial for surface bacteria composition. This finding may inspire future studies on cuticle-microbiome interactions.
MeSH term(s)	Acetobacter/genetics ; Animals ; Drosophila melanogaster ; Lactobacillus plantarum/genetics ; Microbiota
Language	English
Publishing date	2021-09-08
Publishing country	England
Document type	Journal Article
ZDB-ID	2413336-X
ISSN	1756-0500 ; 1756-0500
ISSN (online)	1756-0500
ISSN	1756-0500
DOI	10.1186/s13104-021-05766-7
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Bioreporters for direct mode of action-informed screening of antibiotic producer strains.

Wex, Katharina W / Saur, Julian S / Handel, Franziska / Ortlieb, Nico / Mokeev, Vladislav / Kulik, Andreas / Niedermeyer, Timo H J / Mast, Yvonne / Grond, Stephanie / Berscheid, Anne / Brötz-Oesterhelt, Heike

Cell chemical biology

2021 Volume 28, Issue 8, Page(s) 1242–1252.e4

Abstract: A big challenge in natural product research of today is rapid dereplication of already known substances, to free capacities for the exploration of new agents. Prompt information on bioactivities and mode of action (MOA) speeds up the lead discovery ... ...

Abstract	A big challenge in natural product research of today is rapid dereplication of already known substances, to free capacities for the exploration of new agents. Prompt information on bioactivities and mode of action (MOA) speeds up the lead discovery process and is required for rational compound optimization. Here, we present a bioreporter approach as a versatile strategy for combined bioactivity- and MOA-informed primary screening for antimicrobials. The approach is suitable for directly probing producer strains grown on agar, without need for initial compound enrichment or purification, and works along the entire purification pipeline with culture supernatants, extracts, fractions, and pure substances. The technology allows for MOA-informed purification to selectively prioritize activities of interest. In combination with high-resolution mass spectrometry, the biosensor panel is an efficient and sensitive tool for compound deconvolution. Concomitant information on the affected metabolic pathway enables the selection of appropriate follow-up assays to elucidate the molecular target.
MeSH term(s)	Anti-Bacterial Agents/biosynthesis ; Anti-Bacterial Agents/isolation & purification ; Anti-Bacterial Agents/pharmacology ; Bacillus subtilis/drug effects ; Bacillus subtilis/genetics ; Bacillus subtilis/metabolism ; Biological Products/isolation & purification ; Biological Products/metabolism ; Biosensing Techniques ; Drug Discovery ; Escherichia coli/drug effects ; Mass Spectrometry ; Microbial Sensitivity Tests
Chemical Substances	Anti-Bacterial Agents ; Biological Products
Language	English
Publishing date	2021-03-23
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	2451-9448
ISSN (online)	2451-9448
DOI	10.1016/j.chembiol.2021.02.022
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Genetic engineering approaches for the fermentative production of phenylglycines.

Moosmann, David / Mokeev, Vladislav / Kulik, Andreas / Osipenkov, Natalie / Kocadinc, Susann / Ort-Winklbauer, Regina / Handel, Franziska / Hennrich, Oliver / Youn, Jung-Won / Sprenger, Georg A / Mast, Yvonne

Applied microbiology and biotechnology

2020 Volume 104, Issue 8, Page(s) 3433–3444

Abstract: L-phenylglycine (L-Phg) is a rare non-proteinogenic amino acid, which only occurs in some natural compounds, such as the streptogramin antibiotics pristinamycin I and virginiamycin S or the bicyclic peptide antibiotic dityromycin. Industrially, more ... ...

Abstract	L-phenylglycine (L-Phg) is a rare non-proteinogenic amino acid, which only occurs in some natural compounds, such as the streptogramin antibiotics pristinamycin I and virginiamycin S or the bicyclic peptide antibiotic dityromycin. Industrially, more interesting than L-Phg is the enantiomeric D-Phg as it plays an important role in the fine chemical industry, where it is used as a precursor for the production of semisynthetic β-lactam antibiotics. Based on the natural L-Phg operon from Streptomyces pristinaespiralis and the stereo-inverting aminotransferase gene hpgAT from Pseudomonas putida, an artificial D-Phg operon was constructed. The natural L-Phg operon, as well as the artificial D-Phg operon, was heterologously expressed in different actinomycetal host strains, which led to the successful production of Phg. By rational genetic engineering of the optimal producer strains S. pristinaespiralis and Streptomyces lividans, Phg production could be improved significantly. Here, we report on the development of a synthetic biology-derived D-Phg pathway and the optimization of fermentative Phg production in actinomycetes by genetic engineering approaches. Our data illustrate a promising alternative for the production of Phgs.
MeSH term(s)	Anti-Bacterial Agents/biosynthesis ; Fermentation ; Genes, Bacterial ; Genetic Engineering/methods ; Glycine/analogs & derivatives ; Glycine/biosynthesis ; Operon ; Pseudomonas putida/enzymology ; Pseudomonas putida/genetics ; Stereoisomerism ; Streptomyces/genetics ; Streptomyces lividans/genetics ; Synthetic Biology/methods
Chemical Substances	Anti-Bacterial Agents ; 2-phenylglycine (69-91-0) ; Glycine (TE7660XO1C)
Language	English
Publishing date	2020-02-20
Publishing country	Germany
Document type	Journal Article
ZDB-ID	392453-1
ISSN	1432-0614 ; 0171-1741 ; 0175-7598
ISSN (online)	1432-0614
ISSN	0171-1741 ; 0175-7598
DOI	10.1007/s00253-020-10447-9
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Article ; Online: First Measurement of Hard Exclusive π^{-}Δ^{++} Electroproduction Beam-Spin Asymmetries off the Proton.

Diehl, S / Trotta, N / Joo, K / Achenbach, P / Akbar, Z / Armstrong, W R / Atac, H / Avakian, H / Baashen, L / Baltzell, N A / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I / Benmokhtar, F / Bianconi, A / Biselli, A S / Bossù, F / Brinkmann, K-T /

Briscoe, W J / Bulumulla, D / Burkert, V / Capobianco, R / Carman, D S / Carvajal, J C / Celentano, A / Charles, G / Chatagnon, P / Chesnokov, V / Ciullo, G / Cole, P L / Contalbrigo, M / Costantini, G / Crede, V / D'Angelo, A / Dashyan, N / De Vita, R / Deur, A / Djalali, C / Dupre, R / Ehrhart, M / El Alaoui, A / El Fassi, L / Elouadrhiri, L / Fegan, S / Filippi, A / Gavalian, G / Glazier, D I / Golubenko, A A / Gosta, G / Gothe, R W / Gotra, Y / Griffioen, K / Hafidi, K / Hakobyan, H / Hattawy, M / Hayward, T B / Heddle, D / Hobart, A / Holtrop, M / Illari, I / Ireland, D G / Isupov, E L / Jo, H S / Johnston, R / Keller, D / Khachatryan, M / Khanal, A / Kim, A / Kim, W / Klimenko, V / Kripko, A / Kubarovsky, V / Kuhn, S E / Lagerquist, V / Lanza, L / Leali, M / Lee, S / Lenisa, P / Li, X / MacGregor, I J D / Marchand, D / Mascagna, V / Matousek, G / McKinnon, B / McLauchlin, C / Meziani, Z E / Migliorati, S / Milner, R G / Mineeva, T / Mirazita, M / Mokeev, V / Moran, P / Munoz Camacho, C / Naidoo, P / Neupane, K / Niccolai, S / Niculescu, G / Osipenko, M / Pandey, P / Paolone, M / Pappalardo, L L / Paremuzyan, R / Paul, S J / Phelps, W / Pilleux, N / Pokhrel, M / Poudel, J / Price, J W / Prok, Y / Radic, A / Raue, B A / Reed, T / Richards, J / Ripani, M / Ritman, J / Rossi, P / Sabatié, F / Salgado, C / Schadmand, S / Schmidt, A / Sharabian, Y G / Shrestha, U / Sokhan, D / Sparveris, N / Spreafico, M / Stepanyan, S / Strakovsky, I / Strauch, S / Turisini, M / Tyson, R / Ungaro, M / Vallarino, S / Venturelli, L / Voskanyan, H / Voutier, E / Watts, D P / Wei, X / Williams, R / Wishart, R / Wood, M H / Yurov, M / Zachariou, N / Zhao, Z W / Zurek, M

Physical review letters

2023 Volume 131, Issue 2, Page(s) 21901

Abstract: The polarized cross-section ratio σ_{LT^{'}}/σ_{0} from hard exclusive π^{-}Δ^{++} electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV/10.6 GeV incident electron beam and ... ...

Abstract	The polarized cross-section ratio σ_{LT^{'}}/σ_{0} from hard exclusive π^{-}Δ^{++} electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV/10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. The study, which provides the first observation of this channel in the deep-inelastic regime, focuses on very forward-pion kinematics in the valence regime, and photon virtualities ranging from 1.5 GeV^{2} up to 7 GeV^{2}. The reaction provides a novel access to the d-quark content of the nucleon and to p→Δ^{++} transition generalized parton distributions. A comparison to existing results for hard exclusive π^{+}n and π^{0}p electroproduction is provided, which shows a clear impact of the excitation mechanism, encoded in transition generalized parton distributions, on the asymmetry.
Language	English
Publishing date	2023-07-28
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.131.021901
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Article ; Online: Improved Λp Elastic Scattering Cross Sections between 0.9 and 2.0 GeV/c as a Main Ingredient of the Neutron Star Equation of State.

Rowley, J / Compton, N / Djalali, C / Hicks, K / Price, J / Zachariou, N / Adhikari, K P / Armstrong, W R / Atac, H / Baashen, L / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I / Benmokhtar, F / Bianconi, A / Biondo, L / Biselli, A S / Bondi, M /

Bossù, F / Boiarinov, S / Briscoe, W J / Brooks, W K / Bulumulla, D / Burkert, V D / Carman, D S / Carvajal, J C / Celentano, A / Chatagnon, P / Chesnokov, V / Chetry, T / Ciullo, G / Clark, L / Cole, P L / Contalbrigo, M / Costantini, G / Crede, V / D'Angelo, A / Dashyan, N / De Vita, R / Defurne, M / Deur, A / Diehl, S / Dupré, R / Egiyan, H / Ehrhart, M / El Alaoui, A / El Fassi, L / Eugenio, P / Fedotov, G / Fegan, S / Fersch, R / Filippi, A / Fradi, A / Gavalian, G / Girod, F X / Glazier, D I / Golubenko, A / Gothe, R W / Griffioen, K / Guo, L / Hafidi, K / Hakobyan, H / Hattawy, M / Hayward, T B / Heddle, D / Hobart, A / Holtrop, M / Ilieva, Y / Ireland, D G / Isupov, E L / Jenkins, D / Jo, H S / Joo, K / Keller, D / Khanal, A / Khandaker, M / Kim, A / Korover, I / Kripko, A / Kubarovsky, V / Kuhn, S E / Lanza, L / Leali, M / Lenisa, P / Livingston, K / MacGregor, I J D / Marchand, D / Markov, N / Marsicano, L / Mascagna, V / McCracken, M E / McKinnon, B / McLauchlin, C / Meziani, Z E / Migliorati, S / Mineeva, T / Mirazita, M / Mokeev, V / Munevar, E / Munoz Camacho, C / Nadel-Turonski, P / Neupane, K / Niccolai, S / Niculescu, G / O'Connell, T R / Osipenko, M / Ostrovidov, A I / Pandey, P / Paolone, M / Pappalardo, L L / Pasyuk, E / Pogorelko, O / Prok, Y / Reed, T / Ripani, M / Ritman, J / Rizzo, A / Rosner, G / Sabatie, F / Salgado, C / Schmidt, A / Schumacher, R A / Sharabian, Y G / Shrestha, U / Sokhan, D / Soto, O / Sparveris, N / Strakovsky, I I / Strauch, S / Tyson, R / Ungaro, M / Venturelli, L / Voskanyan, H / Vossen, A / Voutier, E / Watts, D P / Wei, K / Wei, X / Wishart, R / Wood, M H / Yale, B / Yurov, M / Zhang, J / Zhao, Z W

Physical review letters

2022 Volume 127, Issue 27, Page(s) 272303

Abstract: Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the neutron star equation of state. Yet, compared to other elastic scattering ...

Abstract	Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the neutron star equation of state. Yet, compared to other elastic scattering processes, there is very little data on Λ-N scattering. This experiment utilized the CEBAF Large Acceptance Spectrometer (CLAS) detector to study the Λp→Λp elastic scattering cross section in the incident Λ momentum range 0.9-2.0 GeV/c. These are the first data on this reaction since the 1970s. The new cross sections have significantly better accuracy and precision than the existing world data, and the techniques developed here can also be used in future experiments.
Language	English
Publishing date	2022-01-21
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.127.272303
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Article ; Online: First Measurement of Timelike Compton Scattering.

Chatagnon, P / Niccolai, S / Stepanyan, S / Amaryan, M J / Angelini, G / Armstrong, W R / Atac, H / Ayerbe Gayoso, C / Baltzell, N A / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I / Benmokhtar, F / Bianconi, A / Biondo, L / Biselli, A S / Bondi, M / Bossù, F /

Boiarinov, S / Briscoe, W J / Brooks, W K / Bulumulla, D / Burkert, V D / Carman, D S / Carvajal, J C / Caudron, M / Celentano, A / Chetry, T / Ciullo, G / Clark, L / Cole, P L / Contalbrigo, M / Costantini, G / Crede, V / D'Angelo, A / Dashyan, N / Defurne, M / De Vita, R / Deur, A / Diehl, S / Djalali, C / Dupré, R / Egiyan, H / Ehrhart, M / El Alaoui, A / El Fassi, L / Elouadrhiri, L / Fegan, S / Fersch, R / Filippi, A / Gavalian, G / Ghandilyan, Y / Gilfoyle, G P / Girod, F X / Glazier, D I / Golubenko, A A / Gothe, R W / Gotra, Y / Griffioen, K A / Guidal, M / Guo, L / Hakobyan, H / Hattawy, M / Hayward, T B / Heddle, D / Hobart, A / Holtrop, M / Hyde, C E / Ilieva, Y / Ireland, D G / Isupov, E L / Jo, H S / Joo, K / Kabir, M L / Keller, D / Khachatryan, G / Khanal, A / Kim, A / Kim, W / Kripko, A / Kubarovsky, V / Kuhn, S E / Lanza, L / Leali, M / Lee, S / Lenisa, P / Livingston, K / MacGregor, I J D / Marchand, D / Marsicano, L / Mascagna, V / McKinnon, B / McLauchlin, C / Migliorati, S / Mirazita, M / Mokeev, V / Montgomery, R A / Munoz Camacho, C / Nadel-Turonski, P / Naidoo, P / Neupane, K / O'Connell, T R / Osipenko, M / Ouillon, M / Pandey, P / Paolone, M / Pappalardo, L L / Paremuzyan, R / Pasyuk, E / Phelps, W / Pogorelko, O / Poudel, J / Price, J W / Prok, Y / Raue, B A / Reed, T / Ripani, M / Rizzo, A / Rossi, P / Rowley, J / Sabatié, F / Schmidt, A / Segarra, E P / Sharabian, Y G / Shirokov, E V / Shrestha, U / Sokhan, D / Soto, O / Sparveris, N / Strakovsky, I I / Strauch, S / Tyler, N / Tyson, R / Ungaro, M / Vallarino, S / Venturelli, L / Voskanyan, H / Vossen, A / Voutier, E / Watts, D P / Wei, K / Wei, X / Wishart, R / Yale, B / Zachariou, N / Zhang, J / Zhao, Z W

Physical review letters

2022 Volume 127, Issue 26, Page(s) 262501

Abstract: We present the first measurement of the timelike Compton scattering process, γp→p^{'}γ^{*}(γ^{*}→e^{+}e^{-}), obtained with the CLAS12 detector at Jefferson Lab. The photon beam polarization and the decay lepton angular asymmetries are reported in the ... ...

Abstract	We present the first measurement of the timelike Compton scattering process, γp→p^{'}γ^{}(γ^{}→e^{+}e^{-}), obtained with the CLAS12 detector at Jefferson Lab. The photon beam polarization and the decay lepton angular asymmetries are reported in the range of timelike photon virtualities 2.25<Q^{'2}<9 GeV^{2}, squared momentum transferred 0.1<-t<0.8 GeV^{2}, and average total center-of-mass energy squared s=14.5 GeV^{2}. The photon beam polarization asymmetry, similar to the beam-spin asymmetry in deep virtual Compton scattering, is sensitive to the imaginary part of the Compton form factors and provides a way to test the universality of the generalized parton distributions. The angular asymmetry of the decay leptons accesses the real part of the Compton form factors and thus the D-term in the parametrization of the generalized parton distributions.<br />
Language	English
Publishing date	2022-01-14
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.127.262501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: First CLAS12 Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries in the Extended Valence Region.

Christiaens, G / Defurne, M / Sokhan, D / Achenbach, P / Akbar, Z / Amaryan, M J / Atac, H / Avakian, H / Gayoso, C Ayerbe / Baashen, L / Baltzell, N A / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I / Benkel, B / Benmokhtar, F / Bianconi, A / Biselli, A S /

Bondi, M / Booth, W A / Bossù, F / Boiarinov, S / Brinkmann, K-Th / Briscoe, W J / Bueltmann, S / Bulumulla, D / Burkert, V D / Cao, T / Carman, D S / Carvajal, J C / Celentano, A / Chatagnon, P / Chesnokov, V / Chetry, T / Ciullo, G / Clash, G / Cole, P L / Contalbrigo, M / Costantini, G / D'Angelo, A / Dashyan, N / De Vita, R / Deur, A / Diehl, S / Dilks, C / Djalali, C / Dupre, R / Egiyan, H / Ehrhart, M / Alaoui, A El / Fassi, L El / Elouadrhiri, L / Fegan, S / Filippi, A / Gates, K / Gavalian, G / Ghandilyan, Y / Gilfoyle, G P / Girod, F X / Glazier, D I / Golubenko, A A / Gosta, G / Gothe, R W / Gotra, Y / Griffioen, K A / Guidal, M / Hafidi, K / Hakobyan, H / Hattawy, M / Hauenstein, F / Hayward, T B / Heddle, D / Hobart, A / Holmberg, D E / Holtrop, M / Ilieva, Y / Ireland, D G / Isupov, E L / Jo, H S / Keller, D / Khachatryan, M / Khanal, A / Kim, W / Kripko, A / Kubarovsky, V / Kuhn, S E / Lagerquist, V / Lanza, L / Kabir, M L / Leali, M / Lee, S / Lenisa, P / Li, X / Livingston, K / MacGregor, I J D / Marchand, D / Mascagna, V / Matousek, G / McKinnon, B / McLauchlin, C / Meziani, Z E / Migliorati, S / Milner, R G / Mineeva, T / Mirazita, M / Mokeev, V / Molina, E / Camacho, C Munoz / Nadel-Turonski, P / Naidoo, P / Neupane, K / Niccolai, S / Nicol, M / Niculescu, G / Osipenko, M / Ouillon, M / Pandey, P / Paolone, M / Pappalardo, L L / Paremuzyan, R / Pasyuk, E / Paul, S J / Phelps, W / Pilleux, N / Pokhrel, M / Poudel, J / Price, J W / Prok, Y / Radic, A / Ramasubramanian, N / Raue, B A / Reed, Trevor / Richards, J / Ripani, M / Ritman, J / Rossi, P / Sabatié, F / Salgado, C / Schadmand, S / Schmidt, A / Scott, M B C / Sharabian, Y G / Shirokov, E V / Shrestha, U / Simmerling, P / Sparveris, N / Spreafico, M / Stepanyan, S / Strakovsky, I I / Strauch, S / Tan, J A / Trotta, N / Turisini, M / Tyson, R / Ungaro, M / Vallarino, S / Venturelli, L / Voskanyan, H / Voutier, E / Watts, D P / Wei, X / Williams, R / Wishart, R / Wood, M H / Zachariou, N / Zhang, J / Zhao, Z W / Ziegler, V / Zurek, M

Physical review letters

2023 Volume 130, Issue 21, Page(s) 211902

Abstract: Deeply virtual Compton scattering (DVCS) allows one to probe generalized parton distributions describing the 3D structure of the nucleon. We report the first measurement of the DVCS beam-spin asymmetry using the CLAS12 spectrometer with a 10.2 and 10.6 ... ...

Abstract	Deeply virtual Compton scattering (DVCS) allows one to probe generalized parton distributions describing the 3D structure of the nucleon. We report the first measurement of the DVCS beam-spin asymmetry using the CLAS12 spectrometer with a 10.2 and 10.6 GeV electron beam scattering from unpolarized protons. The results greatly extend the Q^{2} and Bjorken-x phase space beyond the existing data in the valence region and provide 1600 new data points measured with unprecedented statistical uncertainty, setting new, tight constraints for future phenomenological studies.
Language	English
Publishing date	2023-05-26
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.130.211902
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: First Measurement of Λ Electroproduction off Nuclei in the Current and Target Fragmentation Regions.

Chetry, T / El Fassi, L / Brooks, W K / Dupré, R / El Alaoui, A / Hafidi, K / Achenbach, P / Adhikari, K P / Akbar, Z / Armstrong, W R / Arratia, M / Atac, H / Avakian, H / Baashen, L / Baltzell, N A / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I /

Benkel, B / Benmokhtar, F / Bianconi, A / Biselli, A S / Bondi, M / Booth, W A / Bossù, F / Boiarinov, S / Brinkmann, K-Th / Briscoe, W J / Bulumulla, D / Burkert, V D / Carman, D S / Carvajal, J C / Celentano, A / Chatagnon, P / Chesnokov, V / Ciullo, G / Cole, P L / Contalbrigo, M / Costantini, G / D'Angelo, A / Dashyan, N / De Vita, R / Defurne, M / Deur, A / Diehl, S / Djalali, C / Egiyan, H / Elouadrhiri, L / Eugenio, P / Fegan, S / Filippi, A / Gavalian, G / Ghandilyan, Y / Gilfoyle, G P / Glazier, D I / Golubenko, A A / Gosta, G / Gothe, R W / Griffioen, K A / Guidal, M / Guo, L / Hakobyan, H / Hattawy, M / Hayward, T B / Heddle, D / Hobart, A / Holtrop, M / Ilieva, Y / Ireland, D G / Isupov, E L / Jenkins, D / Jo, H S / Kabir, M L / Khanal, A / Khandaker, M / Kim, A / Kim, W / Klein, F J / Kripko, A / Kubarovsky, V / Lagerquist, V / Lanza, L / Leali, M / Lee, S / Lenisa, P / Li, X / Livingston, K / MacGregor, I J D / Marchand, D / Mascagna, V / McKinnon, B / McLauchlin, C / Meziani, Z E / Migliorati, S / Mineeva, T / Mirazita, M / Mokeev, V / Munoz Camacho, C / Nadel-Turonski, P / Neupane, K / Niccolai, S / Nicol, M / Niculescu, G / Osipenko, M / Ostrovidov, A I / Pandey, P / Paolone, M / Pappalardo, L L / Paremuzyan, R / Pasyuk, E / Paul, S J / Phelps, W / Pilleux, N / Pokhrel, M / Poudel, J / Price, J W / Prok, Y / Raue, B A / Reed, T / Richards, J / Ripani, M / Ritman, J / Rosner, G / Sabatié, F / Salgado, C / Schadmand, S / Schmidt, A / Schumacher, R A / Sharabian, Y G / Shirokov, E V / Shrestha, U / Simmerling, P / Sokhan, D / Sparveris, N / Stepanyan, S / Strakovsky, I I / Strauch, S / Tan, J A / Trotta, N / Tyson, R / Ungaro, M / Vallarino, S / Venturelli, L / Voskanyan, H / Voutier, E / Wei, X / Weinstein, L B / Williams, R / Wishart, R / Wood, M H / Yurov, M / Zachariou, N / Zhao, Z W / Zurek, M

Physical review letters

2023 Volume 130, Issue 14, Page(s) 142301

Abstract: We report results of Λ hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector and the Continuous Electron Beam Accelerator Facility 5.014 GeV electron beam. These ... ...

Abstract	We report results of Λ hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector and the Continuous Electron Beam Accelerator Facility 5.014 GeV electron beam. These results represent the first measurements of the Λ multiplicity ratio and transverse momentum broadening as a function of the energy fraction (z) in the current and target fragmentation regions. The multiplicity ratio exhibits a strong suppression at high z and an enhancement at low z. The measured transverse momentum broadening is an order of magnitude greater than that seen for light mesons. This indicates that the propagating entity interacts very strongly with the nuclear medium, which suggests that propagation of diquark configurations in the nuclear medium takes place at least part of the time, even at high z. The trends of these results are qualitatively described by the Giessen Boltzmann-Uehling-Uhlenbeck transport model, particularly for the multiplicity ratios. These observations will potentially open a new era of studies of the structure of the nucleon as well as of strange baryons.
Language	English
Publishing date	2023-04-21
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.130.142301
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Photoproduction of the f_{2}(1270) Meson Using the CLAS Detector.

Carver, M / Celentano, A / Hicks, K / Marsicano, L / Mathieu, V / Pilloni, A / Adhikari, K P / Adhikari, S / Amaryan, M J / Angelini, G / Atac, H / Baltzell, N A / Barion, L / Battaglieri, M / Bedlinskiy, I / Benmokhtar, F / Bianconi, A / Biselli, A S / Bondi, M /

Bossù, F / Boiarinov, S / Briscoe, W J / Brooks, W K / Bulumulla, D / Burkert, V D / Carman, D S / Carvajal, J C / Chatagnon, P / Chetry, T / Ciullo, G / Clark, L / Clary, B A / Cole, P L / Contalbrigo, M / Crede, V / D'Angelo, A / Dashyan, N / De Vita, R / Defurne, M / Deur, A / Diehl, S / Djalali, C / Dugger, M / Dupre, R / Egiyan, H / Ehrhart, M / Alaoui, A El / Fassi, L El / Eugenio, P / Fedotov, G / Fegan, S / Filippi, A / Gavalian, G / Gevorgyan, N / Gilfoyle, G P / Girod, F X / Gothe, R W / Griffioen, K A / Hafidi, K / Hakobyan, H / Hattawy, M / Hayward, T B / Heddle, D / Holtrop, M / Huang, Q / Hyde, C E / Ilieva, Y / Ireland, D G / Isupov, E L / Jenkins, D / Jo, H S / Joo, K / Joosten, S / Keller, D / Khanal, A / Khandaker, M / Kim, A / Kim, C W / Klein, F J / Kripko, A / Kubarovsky, V / Lanza, L / Leali, M / Lenisa, P / Livingston, K / MacGregor, I J D / Marchand, D / Mascagna, V / McCracken, M E / McKinnon, B / Meziani, Z E / Mokeev, V / Movsisyan, A / Munevar, E / Camacho, C Munoz / Nadel-Turonski, P / Neupane, K / Niccolai, S / Niculescu, G / Osipenko, M / Ostrovidov, A I / Paolone, M / Pappalardo, L L / Paremuzyan, R / Pasyuk, E / Phelps, W / Pogorelko, O / Prok, Y / Protopopescu, D / Ripani, M / Ritchie, B G / Ritman, J / Rizzo, A / Rosner, G / Rowley, J / Sabatié, F / Salgado, C / Schmidt, A / Schumacher, R A / Sharabian, Y G / Shrestha, U / Sokhan, D / Soto, O / Sparveris, N / Stepanyan, S / Strakovsky, I I / Strauch, S / Tyler, N / Tyson, R / Ungaro, M / Venturelli, L / Voskanyan, H / Voutier, E / Watts, D P / Wei, K / Wei, X / Yale, B / Zachariou, N / Zhang, J / Zhao, Z W

Physical review letters

2021 Volume 126, Issue 8, Page(s) 82002

Abstract: The quark structure of the f_{2}(1270) meson has, for many years, been assumed to be a pure quark-antiquark (qq[over ¯]) resonance with quantum numbers J^{PC}=2^{++}. Recently, it was proposed that the f_{2}(1270) is a molecular state made from the ... ...

Abstract	The quark structure of the f_{2}(1270) meson has, for many years, been assumed to be a pure quark-antiquark (qq[over ¯]) resonance with quantum numbers J^{PC}=2^{++}. Recently, it was proposed that the f_{2}(1270) is a molecular state made from the attractive interaction of two ρ mesons. Such a state would be expected to decay strongly to final states with charged pions due to the dominant decay ρ→π^{+}π^{-}, whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction γp→π^{0}π^{0}p, using the CEBAF Large Acceptance Spectrometer detector at Jefferson Lab for incident beam energies between 3.6 and 5.4 GeV. Differential cross sections, dσ/dt, for f_{2}(1270) photoproduction are extracted with good precision due to low backgrounds and are compared to theoretical calculations.
Language	English
Publishing date	2021-03-12
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.126.082002
Database	MEDical Literature Analysis and Retrieval System OnLINE

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