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1. The use of honey bees (Apis mellifera L.) to monitor airborne particulate matter and assess health effects on pollinators

Author

Papa, G, Pellecchia, M, Capitani, G, Negri, I, Papa G., Pellecchia M., Capitani G., Negri I., Papa, G, Pellecchia, M, Capitani, G, Negri, I, Papa G., Pellecchia M., Capitani G., and Negri I.

Abstract

The honey bee Apis mellifera has long been recognized as an ideal bioindicator for environmental pollution. These insects are exposed to pollutants during their foraging activities, making them effective samplers of environmental contaminants, including heavy metals, pesticides, radionuclides, and volatile organic compounds. Recently, it has been demonstrated that honey bees can be a valuable tool for monitoring and studying airborne PM pollution, a complex mixture of particles suspended in the air, known to have detrimental effects on human health. Airborne particles attached to the bees can be characterised for their morphology, size, and chemical composition using a scanning electron microscopy coupled with X-ray spectroscopy, thus providing key information on the emission sources of the particles, their environmental fate, and the potential to elicit inflammatory injury, oxidative damage, and other health effects in living organisms. Here, we present a comprehensive summary of the studies involving the use of honey bees to monitor airborne PM, including the limits of this approach and possible perspectives. The use of honey bees as a model organism for ecotoxicological studies involving pollutant PM is also presented and discussed, further highlighting the role of the bees as a cornerstone of human, animal, and environmental health, according to the principles of the “One Health” approach.

Published
2024

2. Global fine-resolution data on springtail abundance and community structure

Author

Potapov, A. M., Chen, T. -W., Striuchkova, A. V., Alatalo, J. M., Alexandre, D., Arbea, J., Ashton, T., Ashwood, F., Babenko, A. B., Bandyopadhyaya, I., Baretta, C. R. D. M., Baretta, D., Barnes, A. D., Bellini, B. C., Bendjaballah, M., Berg, M. P., Bernava, V., Bokhorst, S., Bokova, A. I., Bolger, T., Bouchard, M., Brito, R. A., Buchori, D., Castano-Meneses, G., Chauvat, M., Chomel, M., Chow, Y., Chown, S. L., Classen, A. T., Cortet, J., Cuchta, P., de la Pedrosa, A. M., De Lima, E. C. A., Deharveng, L. E., Doblas Miranda, E., Drescher, J., Eisenhauer, N., Ellers, J., Ferlian, O., Ferreira, S. S. D., Ferreira, A. S., Fiera, C., Filser, J., Franken, O., Fujii, S., Koudji, E. G., Gao, M., Gendreau-Berthiaume, B., Gers, C., Greve, M., Hamra-Kroua, S., Handa, I. T., Hasegawa, M., Heiniger, C., Hishi, T., Holmstrup, M., Homet, P., Hoye, T. T., Ivask, M., Jacques, B., Janion-Scheepers, C., Jochum, M., Joimel, S., Jorge, B. C. S., Jucevica, E., Kapinga, E. M., Kovac, L., Krab, E. J., Krogh, P. H., Kuu, A., Kuznetsova, N., Lam, W. N., Lin, D., Lindo, Z., Liu, A. W. P., Lu, J. -Z., Lucianez, M. J., Marx, M. T., Mawan, A., Mccary, M. A., Minor, M. A., Mitchell, G. I., Moreno, D., Nakamori, T., Negri, Ilaria, Nielsen, U. N., Ochoa-Hueso, R., Oliveira Filho, L. C. I., Palacios-Vargas, J. G., Pollierer, M. M., Ponge, J. -F., Potapov, M. B., Querner, P., Rai, B., Raschmanova, N., Rashid, M. I., Raymond-Leonard, L. J., Reis, A. S., Ross, G. M., Rousseau, L., Russell, D. J., Saifutdinov, R. A., Salmon, S., Santonja, M., Saraeva, A. K., Sayer, E. J., Scheunemann, N., Scholz, C., Seeber, J., Shaw, P., Shveenkova, Y. B., Slade, E. M., Stebaeva, S., Sterzynska, M., Sun, X., Susanti, W. I., Taskaeva, A. A., Tay, L. S., Thakur, M. P., Treasure, A. M., Tsiafouli, M., Twala, M. N., Uvarov, A. V., Venier, L. A., Widenfalk, L. A., Widyastuti, R., Winck, B., Winkler, D., Wu, D., Xie, Z., Yin, R., Zampaulo, R. A., Zeppelini, D., Zhang, B., Zoughailech, A., Ashford, O., Klauberg-Filho, O., Scheu, S., Negri I. (ORCID:0000-0001-5188-1408), Potapov, A. M., Chen, T. -W., Striuchkova, A. V., Alatalo, J. M., Alexandre, D., Arbea, J., Ashton, T., Ashwood, F., Babenko, A. B., Bandyopadhyaya, I., Baretta, C. R. D. M., Baretta, D., Barnes, A. D., Bellini, B. C., Bendjaballah, M., Berg, M. P., Bernava, V., Bokhorst, S., Bokova, A. I., Bolger, T., Bouchard, M., Brito, R. A., Buchori, D., Castano-Meneses, G., Chauvat, M., Chomel, M., Chow, Y., Chown, S. L., Classen, A. T., Cortet, J., Cuchta, P., de la Pedrosa, A. M., De Lima, E. C. A., Deharveng, L. E., Doblas Miranda, E., Drescher, J., Eisenhauer, N., Ellers, J., Ferlian, O., Ferreira, S. S. D., Ferreira, A. S., Fiera, C., Filser, J., Franken, O., Fujii, S., Koudji, E. G., Gao, M., Gendreau-Berthiaume, B., Gers, C., Greve, M., Hamra-Kroua, S., Handa, I. T., Hasegawa, M., Heiniger, C., Hishi, T., Holmstrup, M., Homet, P., Hoye, T. T., Ivask, M., Jacques, B., Janion-Scheepers, C., Jochum, M., Joimel, S., Jorge, B. C. S., Jucevica, E., Kapinga, E. M., Kovac, L., Krab, E. J., Krogh, P. H., Kuu, A., Kuznetsova, N., Lam, W. N., Lin, D., Lindo, Z., Liu, A. W. P., Lu, J. -Z., Lucianez, M. J., Marx, M. T., Mawan, A., Mccary, M. A., Minor, M. A., Mitchell, G. I., Moreno, D., Nakamori, T., Negri, Ilaria, Nielsen, U. N., Ochoa-Hueso, R., Oliveira Filho, L. C. I., Palacios-Vargas, J. G., Pollierer, M. M., Ponge, J. -F., Potapov, M. B., Querner, P., Rai, B., Raschmanova, N., Rashid, M. I., Raymond-Leonard, L. J., Reis, A. S., Ross, G. M., Rousseau, L., Russell, D. J., Saifutdinov, R. A., Salmon, S., Santonja, M., Saraeva, A. K., Sayer, E. J., Scheunemann, N., Scholz, C., Seeber, J., Shaw, P., Shveenkova, Y. B., Slade, E. M., Stebaeva, S., Sterzynska, M., Sun, X., Susanti, W. I., Taskaeva, A. A., Tay, L. S., Thakur, M. P., Treasure, A. M., Tsiafouli, M., Twala, M. N., Uvarov, A. V., Venier, L. A., Widenfalk, L. A., Widyastuti, R., Winck, B., Winkler, D., Wu, D., Xie, Z., Yin, R., Zampaulo, R. A., Zeppelini, D., Zhang, B., Zoughailech, A., Ashford, O., Klauberg-Filho, O., Scheu, S., and Negri I. (ORCID:0000-0001-5188-1408)

Abstract

Springtails (Collembola) inhabit soils from the Arctic to the Antarctic and comprise an estimated ~32% of all terrestrial arthropods on Earth. Here, we present a global, spatially-explicit database on springtail communities that includes 249,912 occurrences from 44,999 samples and 2,990 sites. These data are mainly raw sample-level records at the species level collected predominantly from private archives of the authors that were quality-controlled and taxonomically-standardised. Despite covering all continents, most of the sample-level data come from the European continent (82.5% of all samples) and represent four habitats: woodlands (57.4%), grasslands (14.0%), agrosystems (13.7%) and scrublands (9.0%). We included sampling by soil layers, and across seasons and years, representing temporal and spatial within-site variation in springtail communities. We also provided data use and sharing guidelines and R code to facilitate the use of the database by other researchers. This data paper describes a static version of the database at the publication date, but the database will be further expanded to include underrepresented regions and linked with trait data.

Published
2024

3. Effects of oral exposure to brake wear particulate matter on the springtail Orthonychiurus folsomi

Author

Papa, G, Power, K, Forestieri, B, Capitani, G, Maiolino, P, Negri, I, Papa G., Power K., Forestieri B., Capitani G., Maiolino P., Negri I., Papa, G, Power, K, Forestieri, B, Capitani, G, Maiolino, P, Negri, I, Papa G., Power K., Forestieri B., Capitani G., Maiolino P., and Negri I.

Abstract

Most of the heavy metals in urban environments derives from road traffic, particularly from tyres and brake wear (non-exhaust emission sources). These pollutants contaminate the soil, where several organisms have a primary ecosystem role (e.g., springtails, ants, earthworms). Springtails (Collembola) are soil-dwelling animals regulating soil fertility, flow of energy through above- and below-ground food webs, and they contribute to soil microbial community dispersion and biodiversity maintenance. In this study we investigated the ecotoxicological effects of oral exposure to particles emitted from brake pads and cast-iron brake discs in the euedaphic collembola species Orthonychiurus folsomi under laboratory conditions. Our results showed that chronic exposure to brake wear particles can have sub-lethal effects both at low and high concentrations and it can cause histological alterations. Here, SEM-EDX was applied to observe the particulate and we found its chemical markers in the gut and faeces of collembola, while histological analysis detected alterations of the digestive and reproductive systems and of the abdominal fat body at high concentrations.

Published
2023

5. Rethinking the Connections between Ecosystem Services, Pollinators, Pollution, and Health: Focus on Air Pollution and Its Impacts

Author

Plutino, M., Bianchetto, E., Durazzo, A., Lucarini, M., Lucini, L., Negri, I., Lucini L. (ORCID:0000-0002-5133-9464), Negri I. (ORCID:0000-0001-5188-1408), Plutino, M., Bianchetto, E., Durazzo, A., Lucarini, M., Lucini, L., Negri, I., Lucini L. (ORCID:0000-0002-5133-9464), and Negri I. (ORCID:0000-0001-5188-1408)

Abstract

Ecosystems provide many services that are essential for human activities and for our well-being. Many regulation services are interconnected and are fundamental in mitigating and hindering the negative effects of several phenomena such as pollution. Pollution, in particular airborne particulate matter (PM), represents an important risk to human health. This perspective aims at providing a current framework that relates ecosystem services, regulating services, pollination, and human health, with particular regards to pollution and its impacts. A quantitative literature analysis on the topic has been adopted. The health repercussions of problems related to ecosystem services, with a focus on the effects of atmospheric particulate matter, have been highlighted in the work throughout a case study. In polluted environments, pollinators are severely exposed to airborne PM, which adheres to the insect body hairs and can be ingested through contaminated food resources, i.e., pollen and honey. This poses a serious risk for the health of pollinators with consequences on the pollination service and, ultimately, for human health.

Published
2022

6. Globally invariant metabolism but density-diversity mismatch in springtails

Author

Potapov, A. M., Guerra, C. A., van den Hoogen, J., Babenko, A., Bellini, B. C., Berg, M. P., Chown, S. L., Deharveng, L., Kováč, Ľ., Kuznetsova, N. A., Ponge, J. F., Potapov, M. B., Russell, D. J., Alexandre, D., Alatalo, J. M., Arbea, J. I., Bandyopadhyaya, I., Bernava, V., Bokhorst, S., Bolger, T., Castaño-Meneses, G., Chauvat, M., Chen, T. W., Chomel, M., Classen, A. T., Cortet, J., Čuchta, P., Manuela de la Pedrosa, A., Ferreira, S. S. D., Fiera, C., Filser, J., Franken, O., Fujii, S., Koudji, E. G., Gao, M., Gendreau-Berthiaume, B., Gomez-Pamies, D. F., Greve, M., Tanya Handa, I., Heiniger, C., Holmstrup, M., Homet, P., Ivask, M., Janion-Scheepers, C., Jochum, M., Joimel, S., Claudia, S. Jorge B., Jucevica, E., Ferlian, O., Iuñes de Oliveira Filho, L. C., Klauberg-Filho, O., Baretta, D., Krab, E. J., Kuu, A., de Lima, E. C. A., Lin, D., Lindo, Z., Liu, A., Lu, J. Z., Luciañez, M. J., Marx, M. T., Mccary, M. A., Minor, M. A., Nakamori, T., Negri, Ilaria, Ochoa-Hueso, R., Palacios-Vargas, J. G., Pollierer, M. M., Querner, P., Raschmanová, N., Rashid, M. I., Raymond-Léonard, L. J., Rousseau, L., Saifutdinov, R. A., Salmon, S., Sayer, E. J., Scheunemann, N., Scholz, C., Seeber, J., Shveenkova, Y. B., Stebaeva, S. K., Sterzynska, M., Sun, X., Susanti, W. I., Taskaeva, A. A., Thakur, M. P., Tsiafouli, M. A., Turnbull, M. S., Twala, M. N., Uvarov, A. V., Venier, L. A., Widenfalk, L. A., Winck, B. R., Winkler, D., Wu, D., Xie, Z., Yin, R., Zeppelini, D., Crowther, T. W., Eisenhauer, N., Negri I. (ORCID:0000-0001-5188-1408), Potapov, A. M., Guerra, C. A., van den Hoogen, J., Babenko, A., Bellini, B. C., Berg, M. P., Chown, S. L., Deharveng, L., Kováč, Ľ., Kuznetsova, N. A., Ponge, J. F., Potapov, M. B., Russell, D. J., Alexandre, D., Alatalo, J. M., Arbea, J. I., Bandyopadhyaya, I., Bernava, V., Bokhorst, S., Bolger, T., Castaño-Meneses, G., Chauvat, M., Chen, T. W., Chomel, M., Classen, A. T., Cortet, J., Čuchta, P., Manuela de la Pedrosa, A., Ferreira, S. S. D., Fiera, C., Filser, J., Franken, O., Fujii, S., Koudji, E. G., Gao, M., Gendreau-Berthiaume, B., Gomez-Pamies, D. F., Greve, M., Tanya Handa, I., Heiniger, C., Holmstrup, M., Homet, P., Ivask, M., Janion-Scheepers, C., Jochum, M., Joimel, S., Claudia, S. Jorge B., Jucevica, E., Ferlian, O., Iuñes de Oliveira Filho, L. C., Klauberg-Filho, O., Baretta, D., Krab, E. J., Kuu, A., de Lima, E. C. A., Lin, D., Lindo, Z., Liu, A., Lu, J. Z., Luciañez, M. J., Marx, M. T., Mccary, M. A., Minor, M. A., Nakamori, T., Negri, Ilaria, Ochoa-Hueso, R., Palacios-Vargas, J. G., Pollierer, M. M., Querner, P., Raschmanová, N., Rashid, M. I., Raymond-Léonard, L. J., Rousseau, L., Saifutdinov, R. A., Salmon, S., Sayer, E. J., Scheunemann, N., Scholz, C., Seeber, J., Shveenkova, Y. B., Stebaeva, S. K., Sterzynska, M., Sun, X., Susanti, W. I., Taskaeva, A. A., Thakur, M. P., Tsiafouli, M. A., Turnbull, M. S., Twala, M. N., Uvarov, A. V., Venier, L. A., Widenfalk, L. A., Winck, B. R., Winkler, D., Wu, D., Xie, Z., Yin, R., Zeppelini, D., Crowther, T. W., Eisenhauer, N., and Negri I. (ORCID:0000-0001-5188-1408)

Abstract

Soil life supports the functioning and biodiversity of terrestrial ecosystems. Springtails (Collembola) are among the most abundant soil arthropods regulating soil fertility and flow of energy through above- and belowground food webs. However, the global distribution of springtail diversity and density, and how these relate to energy fluxes remains unknown. Here, using a global dataset representing 2470 sites, we estimate the total soil springtail biomass at 27.5 megatons carbon, which is threefold higher than wild terrestrial vertebrates, and record peak densities up to 2 million individuals per square meter in the tundra. Despite a 20-fold biomass difference between the tundra and the tropics, springtail energy use (community metabolism) remains similar across the latitudinal gradient, owing to the changes in temperature with latitude. Neither springtail density nor community metabolism is predicted by local species richness, which is high in the tropics, but comparably high in some temperate forests and even tundra. Changes in springtail activity may emerge from latitudinal gradients in temperature, predation and resource limitation in soil communities. Contrasting relationships of biomass, diversity and activity of springtail communities with temperature suggest that climate warming will alter fundamental soil biodiversity metrics in different directions, potentially restructuring terrestrial food webs and affecting soil functioning.

Published
2023

7. Effects of oral exposure to brake wear particulate matter on the springtail Orthonychiurus folsomi

Author

Papa, Giulia, Power, K., Forestieri, Bartolo, Capitani, G., Maiolino, P., Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), Forestieri B., Negri I. (ORCID:0000-0001-5188-1408), Papa, Giulia, Power, K., Forestieri, Bartolo, Capitani, G., Maiolino, P., Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), Forestieri B., and Negri I. (ORCID:0000-0001-5188-1408)

Abstract

Most of the heavy metals in urban environments derives from road traffic, particularly from tyres and brake wear (non-exhaust emission sources). These pollutants contaminate the soil, where several organisms have a primary ecosystem role (e.g., springtails, ants, earthworms). Springtails (Collembola) are soil-dwelling animals regulating soil fertility, flow of energy through above- and below-ground food webs, and they contribute to soil microbial community dispersion and biodiversity maintenance. In this study we investigated the ecotoxicological effects of oral exposure to particles emitted from brake pads and cast-iron brake discs in the euedaphic collembola species Orthonychiurus folsomi under laboratory conditions. Our results showed that chronic exposure to brake wear particles can have sub-lethal effects both at low and high concentrations and it can cause histological alterations. Here, SEM-EDX was applied to observe the particulate and we found its chemical markers in the gut and faeces of collembola, while histological analysis detected alterations of the digestive and reproductive systems and of the abdominal fat body at high concentrations.

Published
2023

8. Distribution and prevalence of viral genomes in Italian populations of the invasive brown marmorated stink bug Halyomorpha halys

Author

Papa, Giulia, Abba, S., Galetto, L., Parise, C., Marzachi, C., Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), Negri I. (ORCID:0000-0001-5188-1408), Papa, Giulia, Abba, S., Galetto, L., Parise, C., Marzachi, C., Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), and Negri I. (ORCID:0000-0001-5188-1408)

Abstract

Halyomorpha halys (Stål), the brown marmorated stink bug, is a highly invasive insect species that causes significant agricultural losses, especially to orchard fruits, vegetables, herbaceous and ornamental plants. It is also a nuisance pest that seeks shelter in indoor spaces during the winter months. Harnessing the H. halys virome can result in new environmentally sustainable approaches to contain its populations and its relatated agricultural damages. In this study, RNA-Seq data were used to explore the virome associated to ten field populations collected in the Lombardy region in Northern Italy. We identified six complete viral genomes, three of which were previously unknown, belonging to the orders Reovirales, Articulavirales, Ghabrivirales, Durnavirales, and Picornavirales. The prevalence of the six viruses was evaluated by Real-time reverse transcription-quantitative PCR on eighty individuals. Halyomorpha halys ifla-like virus 2 turned out to be the most geographically widespread virus, as it was found in more than 50% of the analyzed insects and in nine out of the ten sampling locations. Moreover, in some individuals, this iflavirus was found in association with each of the other viruses in various combinations that involved up to four viruses. Further studies on such virus-virus interactions and their relationships with the insect host may open the possibility to exploit these naturally occurring viruses as specific and targeted biocontrol agents of H. halys.

Published
2023

9. Particulate Matter Contamination of Bee Pollen in an Industrial Area of the Po Valley (Italy)

Author

Papa, G, Capitani, G, Pellecchia, M, Negri, I, Papa G., Capitani G., Pellecchia M., Negri I., Papa, G, Capitani, G, Pellecchia, M, Negri, I, Papa G., Capitani G., Pellecchia M., and Negri I.

Abstract

The global demand for bee pollen as a dietary supplement for human nutrition is increasing. Pollen, which comprises proteins and lipids from bees’ diets, is rich in essential amino acids, omega fatty acids, and bioactive compounds that can have beneficial effects on human health. However, bee pollen may also contain contaminants due to environmental contamination. To date, data on bee pollen contamination by environmental pollutants refer almost exclusively to pesticides and heavy metals, and very little information is available on the potential contamination of bee pollen by airborne particulate matter (PM), a ubiquitous pollutant that originates from a wide range of anthropogenic sources (e.g., motor vehicles, industrial processes, agricultural operations). In the present study, pollen grains collected by forager bees living in an industrial area of the Po Valley (Northern Italy) were analyzed for contamination by inorganic PM. The morpho-chemical characterization of inorganic particles using SEM/EDX allowed us to identify different emission sources and demonstrate the potential risk of PM entering the food chain and exposing bees to its ingestion.

Published
2021

10. Disentangling multiple PM emission sources in the Po Valley (Italy) using honey bees

Author

Capitani, G, Papa, G, Pellecchia, M, Negri, I, Capitani G., Papa G., Pellecchia M., Negri I., Capitani, G, Papa, G, Pellecchia, M, Negri, I, Capitani G., Papa G., Pellecchia M., and Negri I.

Abstract

Particulate matter (PM) is a complex mixture of airborne chemical compounds commonly classified by their aerodynamic diameter. Although PM toxicity strongly depends on the morphology, chemical composition, and dimensions of particles, exposure limits set by environmental organisations only refer to the mean mass concentration of PM sampled daily or annually by monitoring stations. In this study, we used honey bees as sensors of airborne PM10 and PM2.5 in a highly polluted area of the Po Valley, northern Italy. Honey bees are an efficient sampler of airborne PM because, during flight and foraging activities, their pubescence promotes the accumulation of electrical charge on the body surface owing to air resistance, thus enhancing airborne PM attraction. Particles attached to the body of bees are readily accessible for physico-chemical characterisation using a scanning electron microscope coupled with X-ray spectroscopy (SEM/EDX). Our results demonstrate that residents in the study area are intermittently but chronically exposed to a well-defined spectrum of metal-bearing particles and mineral phases known to induce specific health outcomes. The morphology, size, and chemical composition of PM10 and PM2.5 detected on bees in the monitoring area were indicative of traffic, agricultural operations, and high-temperature combustion processes. The contribution of the A1 Milano-Bologna highway, local wheat and alfalfa cultivation, and the Parma incineration plant were clearly distinguishable. Our data also demonstrated that PM exposure levels may vary sharply throughout the year based on recurrent local activities.

Published
2021

12. The Honey Bee Apis mellifera: An Insect at the Interface between Human and Ecosystem Health

Author

Papa, Giulia, Maier, Roberto Giorgio, Durazzo, A., Lucarini, M., Karabagias, I. K., Plutino, M., Bianchetto, E., Aromolo, R., Pignatti, G., Ambrogio, A., Pellecchia, M., Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), Maier R. (ORCID:0000-0002-5443-6067), Negri I. (ORCID:0000-0001-5188-1408), Papa, Giulia, Maier, Roberto Giorgio, Durazzo, A., Lucarini, M., Karabagias, I. K., Plutino, M., Bianchetto, E., Aromolo, R., Pignatti, G., Ambrogio, A., Pellecchia, M., Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), Maier R. (ORCID:0000-0002-5443-6067), and Negri I. (ORCID:0000-0001-5188-1408)

Abstract

The concept of ecosystem services is widely understood as the services and benefits thatecosystems provide to humans, and they have been categorised into provisioning, regulating, supporting, and cultural services. This article aims to provide an updated overview of the benefits that the honey bee Apis mellifera provides to humans as well as ecosystems. We revised the role of honey bees as pollinators in natural ecosystems to preserve and restore the local biodiversity of wild plants; in agro-ecosystems, this species is widely used to enhance crop yield and quality, meeting the increasing food demand. Beekeeping activity provides humans not only with high-quality food but also with substances used as raw materials and in pharmaceuticals, and in polluted areas, bees convey valuable information on the environmental presence of pollutants and their impact on human and ecosystem health. Finally, the role of the honey bee in symbolic tradition, mysticism, and the cultural values of the bee habitats are also presented. Overall, we suggest that the symbolic value of the honey bee is the most important role played by this insect species, as it may help revitalise and strengthen the intimate and reciprocal relationship between humans and the natural world, avoiding the inaccuracy of considering the ecosystems as mere providers of services to humans.

Published
2022

14. Acute and chronic effects of Titanium dioxide (TiO2) PM1 on honey bee gut microbiota under laboratory conditions

Author

Papa, Giulia, Di Prisco, G., Spini, Giulia, Puglisi, Edoardo, Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), Spini G. (ORCID:0000-0001-8355-7776), Puglisi E. (ORCID:0000-0001-5051-0971), Negri I. (ORCID:0000-0001-5188-1408), Papa, Giulia, Di Prisco, G., Spini, Giulia, Puglisi, Edoardo, Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), Spini G. (ORCID:0000-0001-8355-7776), Puglisi E. (ORCID:0000-0001-5051-0971), and Negri I. (ORCID:0000-0001-5188-1408)

Abstract

Apis mellifera is an important provider of ecosystem services, and during flight and foraging behaviour is exposed to environmental pollutants including airborne particulate matter (PM). While exposure to insecticides, antibiotics, and herbicides may compromise bee health through alterations of the gut microbial community, no data are available on the impacts of PM on the bee microbiota. Here we tested the effects of ultrapure Titanium dioxide (TiO2) submicrometric PM (i.e., PM1, less than 1 µm in diameter) on the gut microbiota of adult bees. TiO2 PM1 is widely used as a filler and whitening agent in a range of manufactured objects, and ultrapure TiO2 PM1 is also a common food additive, even if it has been classified by the International Agency for Research on Cancer (IARC) as a possible human carcinogen in Group 2B. Due to its ubiquitous use, honey bees may be severely exposed to TiO2 ingestion through contaminated honey and pollen. Here, we demonstrated that acute and chronic oral administration of ultrapure TiO2 PM1 to adult bees alters the bee microbial community; therefore, airborne PM may represent a further risk factor for the honey bee health, promoting sublethal effects against the gut microbiota.

Published
2021

15. Traces of honeybees, api‐tourism and beekeeping: From past to present

Author

Topal, E., Adamchuk, L., Negri, Ilaria, Kosoglu, M., Papa, Giulia, Darjan, M. S., Cornea-cipcigan, M., Margaoan, R., Negri I. (ORCID:0000-0001-5188-1408), Papa G. (ORCID:0000-0001-8698-2479), Topal, E., Adamchuk, L., Negri, Ilaria, Kosoglu, M., Papa, Giulia, Darjan, M. S., Cornea-cipcigan, M., Margaoan, R., Negri I. (ORCID:0000-0001-5188-1408), and Papa G. (ORCID:0000-0001-8698-2479)

Abstract

Throughout history, honey has been used for many different purposes and due to its medicinal properties, has been one of the products marketed by traders. The figure of the bee first appeared in drawings on rock with the history of humanity, then on statues, as a logo, on money or stamps, and also in movies. Beekeeping museums, which present the historical process of beekeep-ing, also reflect an important culture with their ancient hives, documents, beekeeping materials, and historical antiquities. The contribution of bees to the sustainability of natural life is very important and has a history of 100 million years. The importance of bees and their by‐products is increasing day by day, and the demand for the beekeeping industry as alternative income determines the emergence of new products and activities. Based on its health properties, apitherapy is the basis of activities such as api‐air and api‐diet. In natural regions (i.e., mountainous areas, forests) where beekeeping is carried out, people’s tradition, food culture, and healthy lifestyle attract society’s at-tention. In this context, api‐tourist activity appears as a new phenomenon. In this article, the existing literature was scanned to create a resource about these new fields triggered by the beekeeping sec-tor.

Published
2021

16. Particulate matter contamination of bee pollen in an industrial area of the po valley (Italy)

Author

Papa, Giulia, Capitani, G., Pellecchia, M., Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), Negri I. (ORCID:0000-0001-5188-1408), Papa, Giulia, Capitani, G., Pellecchia, M., Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), and Negri I. (ORCID:0000-0001-5188-1408)

Abstract

The global demand for bee pollen as a dietary supplement for human nutrition is increasing. Pollen, which comprises proteins and lipids from bees’ diets, is rich in essential amino acids, omega fatty acids, and bioactive compounds that can have beneficial effects on human health. However, bee pollen may also contain contaminants due to environmental contamination. To date, data on bee pollen contamination by environmental pollutants refer almost exclusively to pesticides and heavy metals, and very little information is available on the potential contamination of bee pollen by airborne particulate matter (PM), a ubiquitous pollutant that originates from a wide range of anthropogenic sources (e.g., motor vehicles, industrial processes, agricultural operations). In the present study, pollen grains collected by forager bees living in an industrial area of the Po Valley (Northern Italy) were analyzed for contamination by inorganic PM. The morpho-chemical characterization of inorganic particles using SEM/EDX allowed us to identify different emission sources and demonstrate the potential risk of PM entering the food chain and exposing bees to its ingestion.

Published
2021

17. Influence of microclimate factors on halyomorpha halys dehydration

Author

Grisafi, Francesca, Papa, Giulia, Barbato, Mario, Tombesi, Sergio, Negri, Ilaria, Grisafi F., Papa G. (ORCID:0000-0001-8698-2479), Barbato M. (ORCID:0000-0002-7203-1549), Tombesi S. (ORCID:0000-0002-5126-0561), Negri I. (ORCID:0000-0001-5188-1408), Grisafi, Francesca, Papa, Giulia, Barbato, Mario, Tombesi, Sergio, Negri, Ilaria, Grisafi F., Papa G. (ORCID:0000-0001-8698-2479), Barbato M. (ORCID:0000-0002-7203-1549), Tombesi S. (ORCID:0000-0002-5126-0561), and Negri I. (ORCID:0000-0001-5188-1408)

Abstract

Understanding the interaction between insects and microclimate can be essential in order to plan informed and efficient treatments against agricultural pests. Microclimatic factors such as humidity and temperature can influence the population dynamics of the invasive agricultural pest Halyomorpha halys, the brown marmorated stink bug. The aim of this work was to evaluate the level of transpiration of H. halys in dry, normal and humid microclimates according to the sex, physiological conditions and developmental stage of individuals. Water loss during diapause and the effect of population density on insects’ transpiration were also assessed, as were the nutritional preferences of adults upon exiting diapause. Our data demonstrate that microclimatic conditions significantly influence the transpiration of this pest species. The effect of sex and feeding status on insects’ water loss is marked, while population density does not influence water loss in diapausing individuals. The first nutritional need of the overwintering generations is represented by hydration, likely due to the water loss during diapause.

Published
2021

18. Disentangling multiple PM emission sources in the Po Valley (Italy) using honey bees

Author

Capitani, G., Papa, Giulia, Pellecchia, Marco, Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), Pellecchia M., Negri I. (ORCID:0000-0001-5188-1408), Capitani, G., Papa, Giulia, Pellecchia, Marco, Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), Pellecchia M., and Negri I. (ORCID:0000-0001-5188-1408)

Abstract

Particulate matter (PM) is a complex mixture of airborne chemical compounds commonly classified by their aerodynamic diameter. Although PM toxicity strongly depends on the morphology, chemical composition, and dimensions of particles, exposure limits set by environmental organisations only refer to the mean mass concentration of PM sampled daily or annually by monitoring stations. In this study, we used honey bees as sensors of airborne PM10 and PM2.5 in a highly polluted area of the Po Valley, northern Italy. Honey bees are an efficient sampler of airborne PM because, during flight and foraging activities, their pubescence promotes the accumulation of electrical charge on the body surface owing to air resistance, thus enhancing airborne PM attraction. Particles attached to the body of bees are readily accessible for physico-chemical characterisation using a scanning electron microscope coupled with X-ray spectroscopy (SEM/EDX). Our results demonstrate that residents in the study area are intermittently but chronically exposed to a well-defined spectrum of metal-bearing particles and mineral phases known to induce specific health outcomes. The morphology, size, and chemical composition of PM10 and PM2.5 detected on bees in the monitoring area were indicative of traffic, agricultural operations, and high-temperature combustion processes. The contribution of the A1 Milano-Bologna highway, local wheat and alfalfa cultivation, and the Parma incineration plant were clearly distinguishable. Our data also demonstrated that PM exposure levels may vary sharply throughout the year based on recurrent local activities.

Published
2021

19. Cannibalism in the brown marmorated stink bug halyomorpha halys (Stål)

Author

Papa, Giulia, Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), Negri I. (ORCID:0000-0001-5188-1408), Papa, Giulia, Negri, Ilaria, Papa G. (ORCID:0000-0001-8698-2479), and Negri I. (ORCID:0000-0001-5188-1408)

Abstract

The phytophagous brown marmorated stink bug Halyomorpha halys (Stål) is known to exhibit cannibalistic behaviour towards eggs. Here, we provide evidence of cannibalism among overwintering H. halys adults. Since diapausing individuals have high physiological demands for surviving long periods under stressful conditions, including the risk of depletion of metabolic reserves and desiccation, we assumed that nutritional and water requirements can be met by intraspecific predation. The role of aggregative behaviour in promoting cannibalism is also discussed. Given its evolutionary advantage, this trait should be maintained over generations and may be more widespread than previously considered in species that display aggregative behaviour during adverse seasons.

Published
2020

20. Track finding at 10-MHz hadronic event rate

Author

Bruinsma, M., Fleckenstein, H., Gerndt, E.K.E., Flammer, J., Michetti, A., Negri, I., Norenberg, M., Ressing, D., Riu, I., Rothe, C., Somov, A., Glass, J., Gropel, A., Hahnel, C., Manner, R., Pernack, R., Popov, V., and Schwingenheuer, B.

Subjects
Business, Electronics, Electronics and electrical industries
Abstract

Hera-B is a fixed target experiment using a halo target inside the HERA proton ring to generate B mesons in 920 GeV proton-nucleus interactions. The first-level trigger (FLT) (see Table I for a list of the acronyms used in this paper) of the experiment has to reduce the primary 10-MHz input rate by a factor 200 in less than 10 [micro]s to make it acceptable to the second level trigger (SLT). The trigger strategy is based on the tracking of charged particles and on the reconstruction of their kinematic parameters. The combination of track pairs can also be used for the final decision. A parallel and pipelined set of approximately 60 dedicated boards was designed and built to perform this job. In this paper, the working principle of the system and some results obtained by analyzing the data collected during the run in the year 2000 are described. Index Terms--First-level trigger (FLT), Hera-B, latency, pretrigger, rate, TDU, TFU, TPU, tracking, trigger.

Published
2002

21. Backtesting VaR and expectiles with realized scores

Author

Bellini, F, Negri, I, Pyatkova, M, Bellini, F, Negri, I, and Pyatkova, M

Abstract

Several statistical functionals such as quantiles and expectiles arise naturally as the minimizers of the expected value of a scoring function, a property that is called elicitability (see Gneiting in J Am Stat Assoc 106:746–762, 2011 and the references therein). The existence of such scoring functions gives a natural way to compare the accuracy of different forecasting models, and to test comparative hypotheses by means of the Diebold–Mariano test as suggested in a recent work. In this paper we suggest a procedure to test the accuracy of a quantile or expectile forecasting model in an absolute sense, as in the original Basel I backtesting procedure of value-at-risk. To this aim, we study the asymptotic and finite-sample distributions of empirical scores for normal and uniform i.i.d. samples. We compare on simulated data the empirical power of our procedure with alternative procedures based on empirical identification functions (i.e. in the case of VaR the number of violations) and we find an higher power in detecting at least misspecification in the mean. We conclude with a real data example where both backtesting procedures are applied to AR(1)–Garch(1,1) models fitted to SP500 logreturns for VaR and expectiles’ forecasts.

Published
2019

22. Statistical harmonization and uncertainty assessment in the comparison of satellite and radiosonde climate variables

Author

Finazzi, F., Fassò, A., Madonna, F., Negri, I., Sun, B., and Rosoldi, M.

Subjects
FOS: Computer and information sciences, statistics and probability, spatio-temporal mismatch, vertical profiles, Statistics - Applications, Climate change, maximum likelihood, satellite kernel, splines, ecological modeling, climate change, Applications (stat.AP), Settore SECS-S/01 - Statistica
Abstract

Satellite product validation is a key to ensure the delivery of quality products for climate and weather applications. To do this, a fundamental step is the comparison with other instruments, such as radiosonde. This is especially true for essential climate variables such as temperature and humidity. Thanks to a functional data representation, this paper uses a likelihood-based approach that exploits the measurement uncertainties in a natural way. In particular, the comparison of temperature and humidity radiosonde measurements collected within the network of the Universal Rawinsonde Observation Program (RAOB) and the corresponding atmospheric profiles derived from the infrared atmospheric sounding interferometer aboard MetOp-A and MetOp-B satellites is developed with the aim of understanding the vertical smoothing mismatch uncertainty. Moreover, conventional RAOB functional data representation is assessed by means of a comparison with radiosonde reference measurements given by the Global Climate Observing System (GCOS) Reference Upper-Air Network (GRUAN), which provides high-resolution fully traceable radio-sounding profiles. In this way, the uncertainty related to coarse vertical resolution, or sparseness, of the conventional RAOB is assessed. It has been found that the uncertainty of vertical smoothing mismatch averaged along the profile is 0.50 K for temperature and 0.16 g/kg for water-vapor mixing ratio. Moreover, the uncertainty related to RAOB sparseness, averaged along the profile, is 0.29 K for temperature and 0.13 g/kg for water-vapor mixing ratio.

Published
2018
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23. Search for compositeness, leptoquarks and large extra dimensions in eq contact interactions at HERA

Author

Adloff, C., Andreev, V., Andrieu, B., Arkadov, V., Astvatsatourov, A., Ayyaz, I., Babaev, A., Bähr, J., Baranov, P., Barrelet, E., Bartel, W., Bassler, U., Bate, P., Beglarian, A., Behnke, O., Beier, C., Belousov, A., Benisch, T., Berger, Ch., Bernardi, G., Berndt, T., Bertrand-Coremans, G., Bizot, J.C., Borras, K., Boudry, V., Braunschweig, W., Brisson, V., Bröker, H.-B., Brown, D.P., Brückner, W., Bruel, P., Bruncko, D., Bürger, J., Büsser, F.W., Bunyatyan, A., Burkhardt, H., Burrage, A., Buschhorn, G., Campbell, A.J., Cao, J., Carli, T., Caron, S., Chabert, E., Clarke, D., Clerbaux, B., Collard, C., Contreras, J.G., Coughlan, J.A., Cousinou, M.-C., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., David, M., Davidsson, M., Delcourt, B., Delerue, N., Demirchyan, R., De Roeck, A., De Wolf, E.A., Diaconu, C., Dixon, P., Dodonov, V., Donovan, K.T., Dowell, J.D., Droutskoi, A., Duprel, C., Ebert, J., Eckerlin, G., Eckstein, D., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellerbrock, M., Elsen, E., Erdmann, M., Erdmann, W., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Ferencei, J., Ferrarotto, F., Ferron, S., Fleischer, M., Flügge, G., Fomenko, A., Foresti, I., Formánek, J., Foster, J.M., Franke, G., Gabathuler, E., Gabathuler, K., Garvey, J., Gassner, J., Gayler, J., Gerhards, R., Ghazaryan, S., Goerlich, L., Gogitidze, N., Goldberg, M., Goodwin, C., Grab, C., Grässler, H., Greenshaw, T., Grindhammer, G., Hadig, T., Haidt, D., Hajduk, L., Haustein, V., Haynes, W.J., Heinemann, B., Heinzelmann, G., Henderson, R.C.W., Hengstmann, S., Henschel, H., Heremans, R., Herrera, G., Herynek, I., Hilgers, M., Hiller, K.H., Hilton, C.D., Hladký, J., Höting, P., Hoffmann, D., Hoprich, W., Horisberger, R., Hurling, S., Ibbotson, M., İşsever, Ç., Jacquet, M., Jaffre, M., Janauschek, L., Jansen, D.M., Janssen, X., Jemanov, V., Jönsson, L., Johnson, D.P., Jones, M.A.S., Jung, H., Kästli, H.K., Kant, D., Kapichine, M., Karlsson, M., Karschnick, O., Kaufmann, O., Kausch, M., Keil, F., Keller, N., Kennedy, J., Kenyon, I.R., Kermiche, S., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Koblitz, B., Kolanoski, H., Kolya, S.D., Korbel, V., Kostka, P., Kotelnikov, S.K., Krasny, M.W., Krehbiel, H., Kroseberg, J., Krücker, D., Krüger, K., Küpper, A., Kuhr, T., Kurča, T., Kutuev, R., Lachnit, W., Lahmann, R., Lamb, D., Landon, M.P.J., Lange, W., Laštovička, T., Lebedev, A., Leißner, B., Lemrani, R., Lendermann, V., Levonian, S., Lindstroem, M., Lobo, G., Lobodzinska, E., Lobodzinski, B., Loktionova, N., Lubimov, V., Lüders, S., Lüke, D., Lytkin, L., Magnussen, N., Mahlke-Krüger, H., Malden, N., Malinovski, E., Malinovski, I., Maraček, R., Marage, P., Marks, J., Marshall, R., Martyn, H.-U., Martyniak, J., Maxfield, S.J., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P.-O., Mikocki, S., Milstead, D., Mkrtchyan, T., Mohr, R., Mohrdieck, S., Mondragon, M.N., Moreau, F., Morozov, A., Morris, J.V., Müller, D., Müller, K., Murı́n, P., Nagovizin, V., Naroska, B., Naumann, J., Naumann, Th., Négri, I., Nellen, G., Newman, P.R., Nicholls, T.C., Niebergall, F., Niebuhr, C., Nix, O., Nowak, G., Nunnemann, T., Olsson, J.E., Ozerov, D., Panassik, V., Pascaud, C., Patel, G.D., Perez, E., Phillips, J.P., Pitzl, D., Pöschl, R., Potachnikova, I., Povh, B., Rabbertz, K., Rädel, G., Rauschenberger, J., Reimer, P., Reisert, B., Reyna, D., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rostovtsev, A., Royon, C., Rusakov, S., Rybicki, K., Sankey, D.P.C., Scheins, J., Schilling, F.-P., Schleif, S., Schleper, P., Schmidt, D., Schoeffel, L., Schöning, A., Schörner, T., Schröder, V., Schultz-Coulon, H.-C., Sedlák, K., Sefkow, F., Shekelyan, V., Sheviakov, I., Shtarkov, L.N., Siegmon, G., Sievers, P., Sirois, Y., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Soloviev, Y., Spaskov, V., Specka, A., Spitzer, H., Stamen, R., Steinhart, J., Stella, B., Stellberger, A., Stiewe, J., Straumann, U., Struczinski, W., Swart, M., Taševský, M., Tchernyshov, V., Tchetchelnitski, S., Thompson, G., Thompson, P.D., Tobien, N., Traynor, D., Truöl, P., Tsipolitis, G., Turnau, J., Turney, J.E., Tzamariudaki, E., Udluft, S., Usik, A., Valkár, S., Valkárová, A., Vallée, C., Van Mechelen, P., Vazdik, Y., von Dombrowski, S., Wacker, K., Wallny, R., Walter, T., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., White, G., Wiesand, S., Wilksen, T., Winde, M., Winter, G.-G., Wissing, C., Wobisch, M., Wollatz, H., Wünsch, E., Wyatt, A.C., Žáček, J., Zálešák, J., Zhang, Z., Zhokin, A., Zomer, F., Zsembery, J., and zur Nedden, M.

Published
2000
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26. Measurement of [formula omitted] meson cross sections at HERA and determination of the gluon density in the proton using NLO QCD

Author

Adloff, C., Anderson, M., Andreev, V., Andrieu, B., Arkadov, V., Arndt, C., Ayyaz, I., Babaev, A., Bähr, J., Baranov, P., Barrelet, E., Bartel, W., Bassler, U., Bate, P., Beck, M., Beglarian, A., Behnke, O., Behrend, H.-J., Beier, C., Belousov, A., Berger, Ch., Bernardi, G., Bertrand-Coremans, G., Biddulph, P., Bizot, J.C., Boudry, V., Braunschweig, W., Brisson, V., Brown, D.P., Brückner, W., Bruel, P., Bruncko, D., Bürger, J., Büsser, F.W., Buniatian, A., Burke, S., Burrage, A., Buschhorn, G., Calvet, D., Campbell, A.J., Carli, T., Chabert, E., Charlet, M., Clarke, D., Clerbaux, B., Contreras, J.G., Cormack, C., Coughlan, J.A., Cousinou, M.-C., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., David, M., Davidsson, M., De Roeck, A., De Wolf, E.A., Delcourt, B., Demirchyan, R., Diaconu, C., Dirkmann, M., Dixon, P., Dlugosz, W., Donovan, K.T., Dowell, J.D., Droutskoi, A., Ebert, J., Eckerlin, G., Eckstein, D., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Elsen, E., Enzenberger, M., Erdmann, M., Fahr, A.B., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Fleischer, M., Flügge, G., Fomenko, A., Formánek, J., Foster, J.M., Franke, G., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gassner, J., Gayler, J., Gerhards, R., Ghazaryan, S., Glazov, A., Goerlich, L., Gogitidze, N., Goldberg, M., Gorelov, I., Grab, C., Grässler, H., Greenshaw, T., Griffiths, R.K., Grindhammer, G., Hadig, T., Haidt, D., Hajduk, L., Haller, T., Hampel, M., Haustein, V., Haynes, W.J., Heinemann, B., Heinzelmann, G., Henderson, R.C.W., Hengstmann, S., Henschel, H., Heremans, R., Herynek, I., Hewitt, K., Hiller, K.H., Hilton, C.D., Hladký, J., Hoffmann, D., Horisberger, R., Hurling, S., Ibbotson, M., İşsever, Ç., Jacquet, M., Jaffre, M., Jansen, D.M., Jönsson, L., Johnson, D.P., Jones, M., Jung, H., Kästli, H.K., Kander, M., Kant, D., Kapichine, M., Karlsson, M., Karschnik, O., Katzy, J., Kaufmann, O., Kausch, M., Kenyon, I.R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Köhne, J.H., Kolanoski, H., Kolya, S.D., Korbel, V., Kostka, P., Kotelnikov, S.K., Krämerkämper, T., Krasny, M.W., Krehbiel, H., Krücker, D., Krüger, K., Küpper, A., Küster, H., Kuhlen, M., Kurča, T., Lahmann, R., Landon, M.P.J., Lange, W., Langenegger, U., Lebedev, A., Lehner, F., Lemaitre, V., Lendermann, V., Levonian, S., Lindstroem, M., List, B., Lobo, G., Lobodzinska, E., Lubimov, V., Lüders, S., Lüke, D., Lytkin, L., Magnussen, N., Mahlke-Krüger, H., Malinovski, E., Maraček, R., Marage, P., Marks, J., Marshall, R., Martin, G., Martyn, H.-U., Martyniak, J., Maxfield, S.J., McMahon, T.R., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P.-O., Mikocki, S., Milstead, D., Moeck, J., Mohr, R., Mohrdieck, S., Moreau, F., Morris, J.V., Müller, D., Müller, K., Murin, P., Nagovizin, V., Naroska, B., Naumann, Th., Négri, I., Newman, P.R., Nguyen, H.K., Nicholls, T.C., Niebergall, F., Niebuhr, C., Niedzballa, Ch., Niggli, H., Nikitin, D., Nix, O., Nowak, G., Nunnemann, T., Oberlack, H., Olsson, J.E., Ozerov, D., Palmen, P., Panassik, V., Pascaud, C., Passaggio, S., Patel, G.D., Pawletta, H., Perez, E., Phillips, J.P., Pieuchot, A., Pitzl, D., Pöschl, R., Pope, G., Povh, B., Rabbertz, K., Rauschenberger, J., Reimer, P., Reisert, B., Reyna, D., Rick, H., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Royon, C., Rusakov, S., Rybicki, K., Sankey, D.P.C., Schacht, P., Scheins, J., Schilling, F.-P., Schleif, S., Schleper, P., Schmidt, D., Schoeffel, L., Schröder, V., Schultz-Coulon, H.-C., Schwab, B., Sefkow, F., Semenov, A., Shekelyan, V., Sheviakov, I., Shtarkov, L.N., Siegmon, G., Sirois, Y., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Soloviev, Y., Spaskov, V., Specka, A., Spiekermann, J., Spitzer, H., Squinabol, F., Steffen, P., Steinberg, R., Steinhart, J., Stella, B., Stellberger, A., Stiewe, J., Straumann, U., Struczinski, W., Sutton, J.P., Swart, M., Tapprogge, S., Taševský, M., Tchernshov, V., Tchetchelnitski, S., Theissen, J., Thompson, G., Thompson, P.D., Tobien, N., Todenhagen, R., Truöl, P., Tsipolitis, G., Turnau, J., Tzamariudaki, E., Udluft, S., Usik, A., Valkár, S., Valkárová, A., Vallée, C., Van Esch, P., Van Haecke, A., Van Mechelen, P., Vazdik, Y., Villet, G., Wacker, K., Wallny, R., Walter, T., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L.R., Wiesand, S., Wilksen, T., Willard, S., Winde, M., Winter, G.-G., Wittek, C., Wittmann, E., Wobisch, M., Wollatz, H., Wünsch, E., Žaček, J., Zálešak, J., Zhang, Z., Zhokin, A., Zini, P., Zomer, F., Zsembery, J., and zurNedden, M.

Published
1999
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27. Measurement of internal jet structure in dijet production in deep-inelastic scattering at HERA

Author

Adloff, C., Andreev, V., Andrieu, B., Arkadov, V., Astvatsatourov, A., Ayyaz, I., Babaev, A., Bähr, J., Baranov, P., Barrelet, E., Bartel, W., Bassler, U., Bate, P., Beglarian, A., Behnke, O., Behrend, H.-J., Beier, C., Belousov, A., Berger, Ch., Bernardi, G., Berndt, T., Bertrand-Coremans, G., Biddulph, P., Bizot, J.C., Boudry, V., Braunschweig, W., Brisson, V., Brown, D.P., Brückner, W., Bruel, P., Bruncko, D., Bürger, J., Büsser, F.W., Buniatian, A., Burke, S., Buschhorn, G., Calvet, D., Campbell, A.J., Carli, T., Chabert, E., Charlet, M., Clarke, D., Clerbaux, B., Cocks, S., Contreras, J.G., Cormack, C., Coughlan, J.A., Cousinou, M.-C., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., David, M., Davidsson, M., De Roeck, A., De Wolf, E.A., Delcourt, B., Demirchyan, R., Diaconu, C., Dirkmann, M., Dixon, P., Dlugosz, W., Donovan, K.T., Dowell, J.D., Droutskoi, A., Ebert, J., Eckerlin, G., Eckstein, D., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Elsen, E., Enzenberger, M., Erdmann, M., Farh, A.B., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Fleischer, M., Flügge, G., Fomenko, A., Formánek, J., Foster, J.M., Franke, G., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gassner, J., Gayler, J., Gerhards, R., Ghazaryan, S., Glazov, A., Goerlich, L., Gogitidze, N., Goldberg, M., Gorelov, I., Grab, C., Grässler, H., Greenshaw, T., Griffiths, R.K., Grindhammer, G., Hadig, T., Haidt, D., Hajduk, L., Hampel, M., Haustein, V., Haynes, W.J., Heinemann, B., Heinzelmann, G., Henderson, R.C.W., Hengstmann, S., Henschel, H., Heremans, R., Herynek, I., Hewitt, K., Hiller, K.H., Hilton, C.D., Hladký, J., Hoffmann, D., Holtom, T., Horisberger, R., Hurling, S., Ibbotson, M., İşsever, Ç., Jacquet, M., Jaffre, M., Jansen, D.M., Jönsson, L., Johnson, D.P., Jung, H., Kästli, H.K., Kander, M., Kant, D., Kapichine, M., Karlsson, M., Karschnik, O., Katzy, J., Kaufmann, O., Kausch, M., Keller, N., Kenyon, I.R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Köhne, J.H., Kolanoski, H., Kolya, S.D., Korbel, V., Kostka, P., Kotelnikov, S.K., Krämerkämper, T., Krasny, M.W., Krehbiel, H., Krücker, D., Krüger, K., Küpper, A., Küster, H., Kuhlen, M., Kurča, T., Lachnit, W., Lahmann, R., Lamb, D., Landon, M.P.J., Lange, W., Langenegger, U., Lebedev, A., Lehner, F., Lemaitre, V., Lemrani, R., Lendermann, V., Levonian, S., Lindstroem, M., Lobo, G., Lobodzinska, E., Lubimov, V., Lüders, S., Lüke, D., Lytkin, L., Magnussen, N., Mahlke-Krüger, H., Malden, N., Malinovsky, E., Malinovski, I., Maraček, R., Marage, P., Marks, J., Marshall, R., Martyn, H.-U., Martyniak, J., Maxfield, S.J., McMahon, S.J., McMahon, T.R., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P.-O., Mikocki, S., Milstead, D., Mohr, R., Mohrdieck, S., Mondragon, M., Moreau, F., Morozov, A., Morris, J.V., Müller, D., Müller, K., Murín, P., Nagovizin, V., Naroska, B., Naumann, J., Naumann, Th., Négri, I., Newman, P.R., Nguyen, H.K., Nicholls, T.C., Niebergall, F., Niebuhr, C., Niedzballa, Ch., Niggli, H., Nix, O., Nowak, G., Nunnemann, T., Oberlack, H., Olsson, J.E., Ozerov, D., Palmen, P., Panassik, V., Pascaud, C., Passaggio, S., Patel, G.D., Pawletta, H., Perez, E., Phillips, J.P., Pieuchot, A., Pitzl, D., Pöschl, R., Pope, G., Povh, B., Rabbertz, K., Rauschenberger, J., Reimer, P., Reisert, B., Reyna, D., Rick, H., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Royon, C., Rusakov, S., Rybicki, K., Sankey, D.P.C., Schacht, P., Scheins, J., Schilling, F.-P., Schleif, S., Schleper, P., Schmidt, D., Schoeffel, L., Schröder, V., Schultz-Coulon, H.-C., Sefkow, F., Semenov, A., Shekelyan, V., Sheviakov, I., Shtarkov, L.N., Siegmon, G., Sirois, Y., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Soloviev, Y., Sonnenschein, L., Spaskov, V., Specka, A., Spitzer, H., Squinabol, F., Stamen, R., Steffen, P., Steinberg, R., Steinhart, J., Stella, B., Stellberger, A., Stiewe, J., Straumann, U., Struczinski, W., Sutton, J.P., Swart, M., Tapprogge, S., Taševský, M., Tchernyshov, V., Tchetchelnitski, S., Theissen, J., Thompson, G., Thompson, P.D., Tobien, N., Todenhagen, R., Traynor, D., Truöl, P., Tsipolitis, G., Turnau, J., Tzamariudaki, E., Udluft, S., Usik, A., Valkár, S., Valkárová, A., Vallée, C., Van Esch, P., Van Haecke, A., Van Mechelen, P., Vazdik, Y., Villet, G., Wacker, K., Wallny, R., Walter, T., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L.R., Wiesand, S., Wilksen, T., Willard, S., Winde, M., Winter, G.-G., Wissing, Ch., Wittek, C., Wittmann, E., Wobisch, M., Wollatz, H., Wünsch, E., Žáček, J., Zálešák, J., Zhang, Z., Zhokin, A., Zini, P., Zomer, F., Zsembery, J., and zur Nedden, M.

Published
1999
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28. Forward jet and particle production at HERA

Author

Adloff, C., Anderson, M., Andreev, V., Andrieu, B., Arkadov, V., Arndt, C., Ayyaz, I., Babaev, A., Bähr, J., Bán, J., Baranov, P., Barrelet, E., Bartel, W., Bassler, U., Bate, P., Beck, M., Beglarian, A., Behnke, O., Behrend, H.-J., Beier, C., Belousov, A., Berger, Ch., Bernardi, G., Bertrand-Coremans, G., Biddulph, P., Bizot, J.C., Boudry, V., Braunschweig, W., Brisson, V., Brown, D.P., Brückner, W., Bruel, P., Bruncko, D., Bürger, J., Büsser, F.W., Buniatian, A., Burke, S., Buschhorn, G., Calvet, D., Campbell, A.J., Carli, T., Chabert, E., Charlet, M., Clarke, D., Clerbaux, B., Cocks, S., Contreras, J.G., Cormack, C., Coughlan, J.A., Cousinou, M.-C., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., David, M., Davidsson, M., De Roeck, A., De Wolf, E.A., Delcourt, B., Demirchyan, R., Diaconu, C., Dirkmann, M., Dixon, P., Dlugosz, W., Donovan, K.T., Dowell, J.D., Droutskoi, A., Ebert, J., Eckerlin, G., Eckstein, D., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Elsen, E., Enzenberger, M., Erdmann, M., Fahr, A.B., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Fleischer, M., Flügge, G., Fomenko, A., Formánek, J., Foster, J.M., Franke, G., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gerhards, R., Ghazaryan, S., Glazov, A., Goerlich, L., Gogitidze, N., Goldberg, M., Gorelov, I., Grab, C., Grässler, H., Greenshaw, T., Griffiths, R.K., Grindhammer, G., Hadig, T., Haidt, D., Hajduk, L., Haller, T., Hampel, M., Haustein, V., Haynes, W.J., Heinemann, B., Heinzelmann, G., Henderson, R.C.W., Hengstmann, S., Henschel, H., Heremans, R., Herynek, I., Hewitt, K., Hiller, K.H., Hilton, C.D., Hladký, J., Hoffmann, D., Holtom, T., Horisberger, R., Hudgson, V.L., Hurling, S., Ibbotson, M., İşsever, Ç., Itterbeck, H., Jacquet, M., Jaffre, M., Jansen, D.M., Jönsson, L., Johnson, D.P., Jung, H., Kästli, H.K., Kander, M., Kant, D., Kapichine, M., Karlsson, M., Karschnik, O., Katzy, J., Kaufmann, O., Kausch, M., Kenyon, I.R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Köhne, J.H., Kolanoski, H., Kolya, S.D., Korbel, V., Kostka, P., Kotelnikov, S.K., Krämerkämper, T., Krasny, M.W., Krehbiel, H., Krücker, D., Krüger, K., Küpper, A., Küster, H., Kuhlen, M., Kurča, T., Laforge, B., Lahmann, R., Landon, M.P.J., Lange, W., Langenegger, U., Lebedev, A., Lehner, F., Lemaitre, V., Lendermann, V., Levonian, S., Lindstroem, M., List, B., Lobo, G., Lobodzinska, E., Lubimov, V., Lüke, D., Lytkin, L., Magnussen, N., Mahlke-Krüger, H., Malinovski, E., Maraček, R., Marage, P., Marks, J., Marshall, R., Martin, G., Martyn, H.-U., Martyniak, J., Maxfield, S.J., McMahon, S.J., McMahon, T.R., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P.-O., Mikochi, S., Milstead, D., Moeck, J., Mohr, R., Mohrdieck, S., Moreau, F., Morris, J.V., Müller, D., Müller, K., Murín, P., Nagovizin, V., Naroska, B., Naumann, Th., Négri, I., Newman, P.R., Nguyen, H.K., Nicholls, T.C., Niebergall, F., Niebuhr, C., Niedzballa, Ch., Niggli, H., Nikitin, D., Nix, O., Nowak, G., Nunnemann, T., Oberlack, H., Olsson, J.E., Ozerov, D., Palmen, P., Panassik, V., Pascaud, C., Passaggio, S., Patel, G.D., Pawletta, H., Perez, E., Phillips, J.P., Pieuchot, A., Pitzl, D., Pöschl, R., Pope, G., Povh, B., Rabbertz, K., Rauschenberger, J., Reimer, P., Reisert, B., Rick, H., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Royon, C., Rusakov, S., Rybicki, K., Sankey, D.P.C., Schacht, P., Scheins, J., Schleif, S., Schleper, P., Schmidt, D., Schoeffel, L., Schröder, V., Schultz-Coulon, H.-C., Schwab, B., Sefkow, F., Semenov, A., Shekelyan, V., Sheviakov, I., Shtarkov, L.N., Siegmon, G., Sirois, Y., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Soloviev, Y., Spaskov, V., Specka, A., Spiekermann, J., Spitzer, H., Squinabol, F., Steffen, P., Steinberg, R., Steinhart, J., Stella, B., Stellberger, A., Stiewe, J., Straumann, U., Struczinski, W., Sutton, J.P., Swart, M., Tapprogge, S., Taševský, M., Tchernyshov, V., Tchetchelnitski, S., Theissen, J., Thompson, G., Thompson, P.D., Tobien, N., Todenhagen, R., Truöl, P., Tsipolitis, G., Turnau, J., Tzamariudaki, E., Udluft, S., Usik, A., Valkár, S., Valkárová, A., Vallée, C., Van Esch, P., Van Haecke, A., Van Mechelen, P., Vazdik, Y., Villet, G., Wacker, K., Wallny, R., Walter, T., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L.R., Wiesand, S., Wilksen, T., Willard, S., Winde, M., Winter, G.-G., Wittek, C., Wittmann, E., Wobisch, M., Wollatz, H., Wünsch, E., Žáček, J., Zálešák, J., Zhang, Z., Zhokin, A., Zini, P., Zomer, F., Zsembery, J., and zurNedden, M.

Published
1999
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29. Measurement of open beauty production at HERA

Author

Adloff, C., Andreev, V., Andrieu, B., Arkadov, V., Astvatsatourov, A., Ayyaz, I., Babaev, A., Bähr, J., Baranov, P., Barrelet, E., Bartel, W., Bassler, U., Bate, P., Beglarian, A., Behnke, O., Beier, C., Belousov, A., Benisch, T., Berger, Ch., Bernardi, G., Berndt, T., Bertrand-Coremans, G., Biddulph, P., Bizot, J.C., Boudry, V., Braunschweig, W., Brisson, V., Bröker, H.-B., Brown, D.P., Brückner, W., Bruel, P., Bruncko, D., Bürger, J., Büsser, F.W., Bunyatyan, A., Burke, S., Burrage, A., Buschhorn, G., Calvet, D., Campbell, A.J., Cao, J., Carli, T., Chabert, E., Charlet, M., Clarke, D., Clerbaux, B., Collard, C., Contreras, J.G., Coughlan, J.A., Cousinou, M.-C., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., David, M., Davidsson, M., Delcourt, B., Demirchyan, R., De Roeck, A., De Wolf, E.A., Diaconu, C., Dixon, P., Dodonov, V., Donovan, K.T., Dowell, J.D., Droutskoi, A., Duprel, C., Ebert, J., Eckerlin, G., Eckstein, D., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Elsen, E., Erdmann, M., Fahr, A.B., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Ferron, S., Fleischer, M., Flügge, G., Fomenko, A., Foresti, I., Formánek, J., Foster, J.M., Franke, G., Gabathuler, E., Gabathuler, K., Garvey, J., Gassner, J., Gayler, J., Gerhards, R., Ghazaryan, S., Glazov, A., Goerlich, L., Gogitidze, N., Goldberg, M., Gorelov, I., Grab, C., Grässler, H., Greenshaw, T., Griffiths, R.K., Grindhammer, G., Hadig, T., Haidt, D., Hajduk, L., Haustein, V., Haynes, W.J., Heinemann, B., Heinzelmann, G., Henderson, R.C.W., Hengstmann, S., Henschel, H., Heremans, R., Herrera, G., Herynek, I., Hilgers, M., Hiller, K.H., Hilton, C.D., Hladký, J., Höting, P., Hoffmann, D., Horisberger, R., Hurling, S., Ibbotson, M., Jacquet, M., Jaffre, M., Janauschek, L., Jansen, D.M., Janssen, X., Jönsson, L., Johnson, D.P., Zhokin, A., Jones, M., Jung, H., Kästli, H.K., Kant, D., Kapichine, M., Karlsson, M., Karschnick, O., Kaufmann, O., Kausch, M., Keil, F., Keller, N., Kenyon, I.R., Kermiche, S., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Kolanoski, H., Kolya, S.D., Korbel, V., Kostka, P., Kotelnikov, S.K., Krasny, M.W., Krehbiel, H., Kroseberg, J., Krücker, D., Krüger, K., Küpper, A., Kuhr, T., Kurča, T., Lachnit, W., Lahmann, R., Lamb, D., Landon, M.P.J., Lange, W., Langenegger, U., Lebedev, A., Lehner, F., Lemaitre, V., Lemrani, R., Lendermann, V., Levonian, S., Lindstroem, M., Lubimov, V., Lobo, G., Lobodzinska, E., Lüders, S., Lüke, D., Lytkin, L., Magnussen, N., Mahlke-Krüger, H., Malden, N., Malinovski, E., Malinovski, I., Maraček, R., Marage, P., Marks, J., Marshall, R., Martyn, H.-U., Martyniak, J., Maxfield, S.J., McMahon, T.R., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P.-O., Mikocki, S., Milstead, D., Mohr, R., Mohrdieck, S., Mondragon, M.N., Moreau, F., Morozov, A., Morris, J.V., Müller, D., Müller, K., Murı́n, P., Nagovizin, V., Naroska, B., Naumann, J., Naumann, Th., Négri, I., Newman, P.R., Nguyen, H.K., Nicholls, T.C., Niebergall, F., Niebuhr, C., Nix, O., Nowak, G., Nunnemann, T., Olsson, J.E., Usik, A., Ozerov, D., Palmen, P., Panassik, V., Pascaud, C., Passaggio, S., Patel, G.D., Pawletta, H., Perez, E., Phillips, J.P., Pitzl, D., Pöschl, R., Potashnikova, I., Povh, B., Rabbertz, K., Rädel, G., Rauschenberger, J., Reimer, P., Reisert, B., Reyna, D., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rostovtsev, A., Royon, C., Rusakov, S., Rybicki, K., Sankey, D.P.C., Scheins, J., Schilling, F.-P., Schleif, S., Schleper, P., Schmidt, D., Schoeffel, L., Schörner, T., Schröder, V., Schultz-Coulon, H.-C., Sefkow, F., Shekelyan, V., Sheviakov, I., Shtarkov, L.N., Siegmon, G., Sirois, Y., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Soloviev, Y., Spaskov, V., Specka, A., Spitzer, H., Stamen, R., Steinhart, J., Stella, B., Stellberger, A., Stiewe, J., Straumann, U., Struczinski, W., Sutton, J.P., Swart, M., Taševský, M., Tchernyshov, V., Tchetchelnitski, S., Thompson, G., Thompson, P.D., Tobien, N., Todenhagen, R., Traynor, D., Truöl, P., Tsipolitis, G., Turnau, J., Turney, J., Tzamariudaki, E., Udluft, S., Valkár, S., Valkárová, A., Vallée, C., Van Haecke, A., Van Mechelen, P., Vazdik, Y., Villet, G., von Dombrowski, S., Wacker, K., Wallny, R., Walter, T., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L.R., White, G., Wiesand, S., Wilksen, T., Winde, M., Winter, G.-G., Wissing, Ch., Wobisch, M., Wollatz, H., Wünsch, E., Žáček, J., Zálešák, J., Zhang, Z., Zini, P., Zomer, F., Zsembery, J., and zur Nedden, M.

Published
1999
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30. Forward π°-meson production at HERA

Author

Adloff, C., Andreev, V., Andrieu, B., Arkadov, V., Astvatsatourov, A., Ayyaz, I., Babaev, A., Bähr, J., Baranov, P., Barrelet, E., Bartel, W., Bassler, U., Bate, P., Beglarian, A., Behnke, O., Beier, C., Belousov, A., Benisch, T., Berger, Ch., Bernardi, G., Berndt, T., Bertrand-Coremans, G., Biddulph, P., Bizot, J.C., Borras, K., Boudry, V., Braunschweig, W., Brisson, V., Bröker, H.-B., Brown, D.P., Brückner, W., Bruel, P., Bruncko, D., Bürger, J., Büsser, F.W., Bunyatyan, A., Burke, S., Burrage, A., Buschhorn, G., Campbell, A.J., Cao, J., Carli, T., Chabert, E., Charlet, M., Clarke, D., Clerbaux, B., Collard, C., Contreras, J.G., Coughlan, J.A., Cousinou, M.-C., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., David, M., Davidsson, M., Delcourt, B., Demirchyan, R., De Roeck, A., De Wolf, E.A., Diaconu, C., Dixon, P., Dodonov, V., Donovan, K.T., Dowell, J.D., Droutskoi, A., Duprel, C., Ebert, J., Eckerlin, G., Eckstein, D., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Elsen, E., Erdmann, M., Fahr, A.B., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Ferron, S., Fleischer, M., Flügge, G., Fomenko, A., Foresti, I., Formánek, J., Foster, J.M., Franke, G., Gabathuler, E., Gabathuler, K., Garvey, J., Gassner, J., Gayler, J., Gerhards, R., Ghazaryan, S., Glazov, A., Goerlich, L., Gogitidze, N., Goldberg, M., Gorelov, I., Grab, C., Grässler, H., Greenshaw, T., Griffiths, R.K., Grindhammer, G., Hadig, T., Haidt, D., Hajduk, L., Haustein, V., Haynes, W.J., Heinemann, B., Heinzelmann, G., Henderson, R.C.W., Hengstmann, S., Henschel, H., Heremans, R., Herrera, G., Herynek, I., Hilgers, M., Hiller, K.H., Hilton, C.D., Hladký, J., Höting, P., Hoffmann, D., Horisberger, R., Hurling, S., Ibbotson, M., İşsever, Ç., Jacquet, M., Jaffre, M., Janauschek, L., Jansen, D.M., Janssen, X., Jönsson, L., Johnson, D.P., Jones, M., Jung, H., Kästli, H.K., Kant, D., Kapichine, M., Karlsson, M., Karschnick, O., Kaufmann, O., Kausch, M., Keil, F., Keller, N., Kenyon, I.R., Kermiche, S., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Kolanoski, H., Kolya, S.D., Korbel, V., Kostka, P., Kotelnikov, S.K., Krasny, M.W., Krehbiel, H., Kroseberg, J., Krücker, D., Krüger, K., Küpper, A., Kuhr, T., Kurča, T., Lachnit, W., Lahmann, R., Lamb, D., Landon, M.P.J., Lange, W., Lebedev, A., Lehner, F., Lemaitre, V., Lemrani, R., Lendermann, V., Levonian, S., Lindstroem, M., Lobo, G., Lobodzinska, E., Lubimov, V., Lüders, S., Lüke, D., Lytkin, L., Magnussen, N., Mahlke-Krüger, H., Malden, N., Malinovski, E., Malinovski, I., Maraček, R., Marage, P., Marks, J., Marshall, R., Martyn, H.-U., Martyniak, J., Maxfield, S.J., McMahon, T.R., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P.-O., Mikocki, S., Milstead, D., Mohr, R., Mohrdieck, S., Mondragon, M.N., Moreau, F., Morozov, A., Morris, J.V., Müller, D., Müller, K., Murı́n, P., Nagovizin, V., Naroska, B., Naumann, J., Naumann, Th., Négri, I., Newman, P.R., Nguyen, H.K., Nicholls, T.C., Niebergall, F., Niebuhr, C., Nix, O., Nowak, G., Nunnemann, T., Olsson, J.E., Ozerov, D., Panassik, V., Pascaud, C., Passaggio, S., Patel, G.D., Perez, E., Phillips, J.P., Pitzl, D., Pöschl, R., Potashnikova, I., Povh, B., Rabbertz, K., Rädel, G., Rauschenberger, J., Reimer, P., Reisert, B., Reyna, D., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rostovtsev, A., Royon, C., Rusakov, S., Rybicki, K., Sankey, D.P.C., Scheins, J., Schilling, F.-P., Schleif, S., Schleper, P., Schmidt, D., Schoeffel, L., Schörner, T., Schröder, V., Schultz-Coulon, H.-C., Sefkow, F., Shekelyan, V., Sheviakov, I., Shtarkov, L.N., Siegmon, G., Sievers, P., Sirois, Y., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Soloviev, Y., Spaskov, V., Specka, A., Spitzer, H., Stamen, R., Steinhart, J., Stella, B., Stellberger, A., Stiewe, J., Straumann, U., Struczinski, W., Sutton, J.P., Swart, M., Taševský, M., Tchernyshov, V., Tchetchelnitski, S., Thompson, G., Thompson, P.D., Tobien, N., Traynor, D., Truöl, P., Tsipolitis, G., Turnau, J., Turney, J., Tzamariudaki, E., Udluft, S., Usik, A., Valkár, S., Valkárová, A., Vallée, C., Van Haecke, A., Van Mechelen, P., Vazdik, Y., Villet, G., von Dombrowski, S., Wacker, K., Wallny, R., Walter, T., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L.R., White, G., Wiesand, S., Wilksen, T., Winde, M., Winter, G.-G., Wissing, Ch., Wobisch, M., Wollatz, H., Wünsch, E., Žáček, J., Zálešák, J., Zhang, Z., Zhokin, A., Zini, P., Zomer, F., Zsembery, J., and zur Nedden, M.

Published
1999
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32. Investigation over the life cycle of ST1-C the endosymbiont of Scaphoideus titanus

Author

Pajoro, M., Marzorati, M., Negri, I., Sacchi, L., Daffonchio, D., Alma, A., Negri, I. (ORCID:0000-0001-5188-1408), Pajoro, M., Marzorati, M., Negri, I., Sacchi, L., Daffonchio, D., Alma, A., and Negri, I. (ORCID:0000-0001-5188-1408)

Abstract

Scaphoideus titanus Ball (Hemiptera Cicadellidae) is a phloem-feeder leafhopper vector of ‘Candidatus Phytoplasma vitis’, the phytoplasma responsible of “flavescence dorée” (FD), a grape yellows afflicting several wine production areas in Europe. Natural symbionts of the leafhopper for symbiotic control of FD transmission could be used. Previous work showed the presence of a CFB bacterium, ‘Candidatus Cardinium sp.’ (named ST1-C) in several body districts of S. titanus. Our work was aimed to investigate the life cycle of ST1-C endosymbiont inside and outside of insect body. We fed S. titanus individuals on artificial media and tested insects and diets after the treatment for the presence of the ST1-C endosymbiont by qualitative and quantitative PCR, showing the release of the bacterium during feeding. We also performed fluorescent in situ hybridization on the sugar solutions after insect feeding, detecting ST1-C cells that confirmed its release into the medium. We tested by ST1-C-specific PCR DNA extracted from small areas of grape leaves exposed to S. titanus, identifying the bacterium in the majority of pierced leaves. Our experiments suggest that the ST1-C endosymbiont can undergo a horizontal transmission and have a complex life cycle possibly involving more than one host.

Published
2008

33. Inclusive photoproduction of neutral pions in the photon hemisphere at HERA

Author

Adloff, C, Andreev, V, Andrieu, B, Arkadov, V, Astvatsatourov, A, Ayyaz, I, Babaev, A, Bahr, J, Baranov, P, Barrelet, E, Bartel, W, Bassler, U, Bate, P, Beglarian, A, Behnke, O, Beier, C, Belousov, A, Benisch, T, Berger, C, Bernardi, G, Berndt, T, Bertrand-Coremans, G, Bizot, JC, Borras, K, Boudry, V, Braunschweig, W, Brisson, V, Broker, HB, Brown, DP, Bruckner, W, Bruel, P, Bruncko, D, Burger, J, Busser, FW, Bunyatyan, A, Burkhardt, H, Burrage, A, Buschhorn, G, Campbell, AJ, Cao, J, Carli, T, Caron, S, Chabert, E, Clarke, D, Clerbaux, B, Collard, C, Contreras, JG, Coughlan, JA, Cousinou, MC, Cox, BE, Cozzika, G, Cvach, J, Dainton, JB, Dau, WD, Daum, K, David, M, Davidsson, M, Delcourt, B, Delerue, N, Demirchyan, R, De Roeck, A, De Wolf, EA, Diaconu, C, Dixon, P, Dodonov, V, Donovan, KT, Dowell, JD, Droutskoi, A, Duprel, C, Ebert, J, Eckerlin, G, Eckstein, D, Efremenko, V, Egli, S, Eichler, R, Eisele, F, Eisenhandler, E, Ellerbrock, M, Elsen, E, Erdmann, M, Faulkner, PJW, Favart, L, Fedotov, A, Felst, R, Ferencei, J, Ferrarotto, F, Ferron, S, Fleischer, M, Flugge, G, Fomenko, A, Foresti, I, Formanek, J, Foster, JM, Franke, G, Gabathuler, E, Gabathuler, K, Garvey, J, Gassner, J, Gayler, J, Gerhards, R, Ghazaryan, S, Glazov, A, Goerlich, L, Gogitidze, N, Goldberg, M, Goodwin, C, Grab, C, Grassler, H, Greenshaw, T, Grindhammer, G, Hadig, T, Haidt, D, Hajduk, L, Haustein, V, Haynes, WJ, Heinemann, B, Heinzelmann, G, Henderson, RCW, Hengstmann, S, Henschel, H, Heremans, R, Herrera, G, Herynek, I, Hilgers, M, Hiller, KH, Hilton, CD, Hladky, J, Hoting, P, Hoffmann, D, Hoprich, W, Horisberger, R, Hurling, S, Ibbotson, M, Issever, C, Jacquet, M, Jaffre, M, Janauschek, L, Jansen, DM, Janssen, X, Jemanov, V, Jonsson, L, Johnson, DP, Jones, MAS, Jung, H, Kastli, HK, Kant, D, Kapichine, M, Karlsson, M, Karschnick, O, Kaufmann, O, Kausch, M, Keil, F, Keller, N, Kennedy, J, Kenyon, IR, Kermiche, S, Kiesling, C, Klein, M, Kleinwort, C, Knies, G, Koblitz, B, Kolanoski, H, Kolya, SD, Korbel, V, Kostka, P, Kotelnikov, SK, Krasny, MW, Krehbiel, H, Kroseberg, J, Krucker, D, Kruger, K, Kupper, A, Kuhr, T, Kurca, T, Kutuev, R, Lachnit, W, Lahmann, R, Lamb, D, Landon, MPJ, Lange, W, Lastovicka, T, Lebedev, A, Leissner, B, Lemaitre, V, Lemrani, R, Lendermann, V, Levonian, S, Lindstroem, M, Lobo, G, Lobodzinska, E, Lobodzinski, B, Loktionova, N, Lubimov, V, Luders, S, Luke, D, Lytkin, L, Magnussen, N, Mahlke-Kruger, H, Malden, N, Malinovski, E, Malinovski, I, Maracek, R, Marage, P, Marks, J, Marshall, R, Martyn, HU, Martyniak, J, Maxfield, SJ, Mehta, A, Meier, K, Merkel, P, Metlica, F, Meyer, A, Meyer, H, Meyer, J, Meyer, PO, Mikocki, S, Milstead, D, Mkrtchyan, T, Mohr, R, Mohrdieck, S, Mondragon, MN, Moreau, F, Morozov, A, Morris, JV, Muller, D, Muller, K, Murin, P, Nagovizin, V, Naroska, B, Naumann, J, Naumann, T, Negri, I, Nellen, G, Newman, PR, Nicholls, TC, Niebergall, F, Niebuhr, C, Nix, O, Nowak, G, Nunnemann, T, Olsson, JE, Ozerov, D, Panassik, V, Pascaud, C, Passaggio, S, Patel, GD, Perez, E, Phillips, JP, Pitzl, D, Poschl, R, Potachnikova, I, Povh, B, Rabbertz, K, Radel, G, Rauschenberger, J, Reimer, P, Reisert, B, Reyna, D, Riess, S, Rizvi, E, Robmann, P, Roosen, R, Rostovtsev, A, Royon, C, Rusakov, S, Rybicki, K, Sankey, DPC, Scheins, J, Schilling, FP, Schleif, S, Schleper, P, Schmidt, D, Schoeffel, L, Schoning, A, Schorner, T, Schroder, V, Schultz-Coulon, HC, Sedlak, K, Sefkow, F, Shekelyan, V, Sheviakov, I, Shtarkov, LN, Siegmon, G, Sievers, P, Sirois, Y, Sloan, T, Smirnov, P, Smith, M, Solochenko, V, Soloviev, Y, Spaskov, V, Specka, A, Spitzer, H, Stamen, R, Steinhart, J, Stella, B, Stellberger, A, Stiewe, J, Straumann, U, Struczinski, W, Sutton, JP, Swart, M, Tasevsky, M, Tchernyshov, V, Tchetchelnitski, S, Thompson, G, Thompson, PD, Tobien, N, Traynor, D, Truol, P, Tsipolitis, G, Turnau, J, Turney, JE, Tzamariudaki, E, Udluft, S, Usik, A, Valkar, S, Valkarova, A, Vallee, C, Van Mechelen, P, Vazdik, Y, von Dombrowski, S, Wacker, K, Wallny, R, Walter, T, Waugh, B, Weber, G, Weber, M, Wegener, D, Wegner, A, Wengler, T, Werner, M, White, G, Wiesand, S, Wilksen, T, Winde, M, Winter, GG, Wissing, C, Wobisch, M, Wollatz, H, Wunsch, E, Zacek, J, Zalesak, J, Zhang, Z, Zhokin, A, Zomer, F, Zsembery, J, zur Nedden, M, Collaboration, H, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and H1 Collaboration

Subjects
Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, Monte Carlo method, FOS: Physical sciences, Context (language use), HERA, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), symbols.namesake, Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], symbols, Feynman diagram, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous)
Abstract

The inclusive cross section for the photoproduction of neutral pions has been measured as a function of the transverse momentum, rapidity, and Feynman x of the pizero mesons at an average photon--proton centre-of-mass energy of 208 GeV and for photon virtualities below Q^2=0.01 GeV^2. The pizero measurement extends the range covered by previous charged particle measurements at HERA by two units of rapidity in the photon direction down to a value of -5.5 in the gamma p centre-of-mass frame. The pizero transverse momentum distribution is well described over the whole measured range by a power law ansatz, while an exponential fit falls below the data at transverse momentum values above 1.5 GeV/c. Good agreement with the predictions of the Monte Carlo models PYTHIA and PHOJET is found. In the context of the PYTHIA model the data are inconsistent with large intrinsic transverse momentum values in the photon., 20 pages, 6 figures and 3 tables

Published
2000
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34. Measurement of dijet cross-sections in low ${\rm Q}^2$ ep collisions and the extraction of an effective parton density for the virtual photon

Author

Adloff, C, Andreev, V, Andrieu, B, Arkadov, V, Astvatsatourov, A, Ayyaz, I, Babaev, A, Bahr, J, Baranov, P, Barrelet, E, Bartel, T, Bassler, U, Bate, P, Beglarian, A, Behnke, O, Behrend, HJ, Beier, C, Belousov, A, Berger, C, Bernardi, G, Berndt, T, Bertrand-Coremans, G, Biddulph, P, Bizot, JC, Boudry, V, Braunschweig, W, Brisson, V, Brown, DP, Bruckner, W, Bruel, P, Bruncko, D, Burger, J, Busser, FW, Buniatian, A, Burke, S, Burrage, A, Buschhorn, G, Calvet, D, Campbell, AJ, Carli, T, Chabert, E, Charlet, M, Chyla, J, Clarke, D, Clerbaux, B, Contreras, JG, Cormack, C, Coughlan, JA, Cousinou, MC, Cox, BE, Cozzika, G, Cvach, J, Dainton, JB, Dau, WD, Daum, K, David, M, Davidsson, M, De Roeck, A, De Wolf, EA, Delcourt, B, Demirchyan, R, Diaconu, C, Dirkmann, M, Dixon, P, Dlugosz, W, Donovan, KT, Dowell, JD, Droutskoi, A, Ebert, J, Eckerlin, G, Eckstein, D, Efremenko, V, Egli, S, Eichler, R, Eisele, F, Eisenhandler, E, Elsen, E, Enzenberger, M, Erdmann, M, Fahr, AB, Faulkner, PJW, Favart, L, Fedotov, A, Felst, R, Feltesse, J, Ferencei, J, Ferrarotto, F, Fleischer, M, Flugge, G, Fomenko, A, Formanek, J, Foster, JM, Franke, G, Gabathuler, E, Gabathuler, K, Gaede, F, Garvey, J, Gassner, J, Gayler, J, Gerhards, R, Ghazaryan, S, Glazov, A, Goerlich, L, Gogitidze, N, Goldberg, M, Gorelov, I, Grab, C, Grassler, H, Greenshaw, T, Griffiths, RK, Grindhammer, G, Hadig, T, Haidt, D, Hajduk, L, Hampel, M, Haustein, V, Haynes, WJ, Heinemann, B, Heinzelmann, G, Henderson, RCW, Hengstmann, S, Henschel, H, Heremans, R, Herynek, I, Hewitt, K, Hiller, KH, Hilton, CD, Hladky, J, Hoffmann, D, Horisberger, R, Hurling, S, Ibbotson, M, Issever, C, Jacquet, M, Jaffre, M, Janauschek, L, Jansen, DM, Jonsson, L, Johnson, DP, Jones, M, Jung, H, Kastli, HK, Kander, M, Kant, D, Kapichine, M, Karlsson, M, Karschnik, O, Katzy, J, Kaufmann, O, Kausch, M, Keller, N, Kenyon, IR, Kermiche, S, Keuker, C, Kiesling, C, Klein, M, Kleinwort, C, Knies, G, Kohne, JH, Kolanoski, H, Kolya, SD, Korbel, V, Kostka, P, Kotelnikov, SK, Kramerkamper, T, Krasny, MW, Krehbiel, H, Krucker, D, Kruger, K, Kupper, A, Kuster, H, Kuhlen, M, Kurca, T, Lachnit, W, Lahmann, R, Lamb, D, Landon, MPJ, Lange, W, Langenegger, U, Lebedev, A, Lehner, F, Lemaitre, V, Lemrani, R, Lendermann, V, Levonian, S, Lindstroem, M, Lobo, G, Lobodzinska, E, Lubimov, V, Luders, S, Luke, D, Lytkin, L, Magnussen, N, Mahlke-Kruger, H, Malden, N, Malinovski, E, Malinovski, I, Maracek, R, Marage, P, Marks, J, Marshall, R, Martyn, HU, Martyniak, J, Maxfield, SJ, McMahon, TR, Mehta, A, Meier, K, Merkel, P, Metlica, F, Meyer, A, Meyer, H, Meyer, J, Meyer, PO, Mikocki, S, Milstead, D, Mohr, R, Mohrdieck, S, Mondragon, M, Moreau, F, Morozov, A, Morris, JV, Muller, D, Muller, K, Murin, P, Nagovizin, V, Naroska, B, Naumann, J, Naumann, T, Negri, I, Newman, PR, Nguyen, HK, Nicholls, TC, Niebergall, F, Niebuhr, C, Niedzballa, C, Niggli, H, Nix, O, Nowak, G, Nunnemann, T, Oberlack, H, Olsson, JE, Ozerov, D, Palmen, P, Panassik, V, Pascaud, C, Passaggio, S, Patel, GD, Pawletta, H, Perez, E, Phillips, JP, Pieuchot, A, Pitzl, D, Poschl, R, Pope, G, Povh, B, Rabbertz, K, Rauschenberger, J, Reimer, P, Reisert, B, Reyna, D, Rick, H, Riess, S, Rizvi, E, Robmann, P, Roosen, R, Rosenbauer, K, Rostovtsev, A, Rouse, F, Royon, C, Rusakov, S, Rybicki, K, Sankey, DPC, Schacht, P, Scheins, J, Schilling, FP, Schleif, S, Schleper, P, Schmidt, D, Schoeffel, L, Schroder, V, Schultz-Coulon, HC, Sefkow, F, Semenov, A, Shekelyan, V, Sheviakov, I, Shtarkov, LN, Siegmon, G, Sirois, Y, Sloan, T, Smirnov, P, Smith, M, Solochenko, V, Soloviev, Y, Spaskov, V, Specka, A, Spitzer, H, Squinabol, F, Stamen, R, Steffen, P, Steinberg, R, Steinhart, J, Stella, B, Stellberger, A, Stiewe, J, Straumann, U, Struczinski, W, Sutton, JP, Swart, M, Tapprogge, S, Tasevsky, M, Tchernyshov, V, Tchetchelnitski, S, Theissen, J, Thompson, G, Thompson, PD, Tobien, N, Todenhagen, R, Traynor, D, Truol, P, Tsipolitis, G, Turnau, J, Tzamariudaki, E, Udluft, S, Usik, A, Valkar, S, Valkarova, A, Vallee, C, Van Esch, P, Van Haecke, A, Van Mechelen, P, Vazdik, Y, Villet, G, Wacker, K, Wallny, R, Walter, T, Waugh, B, Weber, G, Weber, M, Wegener, D, Wegner, A, Wengler, T, Werner, M, West, LR, White, G, Wiesand, S, Wilksen, T, Willard, S, Winde, M, Winter, GG, Wissing, C, Wittek, C, Wittmann, E, Wobisch, M, Wollatz, H, Wunsch, E, Zacek, J, Zalesak, J, Zhang, Z, Zhokin, A, Zini, P, Zomer, F, Zsembery, J, zur Nedden, M, and Collaboration, H

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Order (ring theory), Virtual particle, Elementary particle, Parton, HERA, Nuclear physics, Massless particle, Cover (topology), High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Energy (signal processing)
Abstract

The triple-differential dijet cross-section, \({\rm d}^3 \sigma_{ep}/{\rm d} Q^2{\rm d} \overline{E_t}^2 {\rm d}x^{jets}_\gamma\), is measured with the H1 detector at HERA as a function of the photon virtuality \(Q^2\), the fraction of the photon's momentum carried by the parton entering the hard scattering, \(\x^{jets}_\gamma\), and the square of the mean transverse energy, \(\overline{E_t}^2\), of the two highest \(E_t\) jets. Jets are found using a longitudinal boost-invariant \(k_T\) clustering algorithm in the \(\gamma^* p\) center of mass frame. The measurements cover the ranges \(1.6 < Q^2 < 80\) GeV\(^2\) in virtuality and \(0.1 < y < 0.7\) in inelasticity y. The results are well described by leading order QCD models which include the effects of a resolved component to the virtual photon. Models which treat the photon as point-like fail to describe the data. An effective leading order parton density for the virtual photon is extracted as a function of the photon virtuality, the probing scale and the parton momentum fraction. The \(x_{\gamma}\) and probing scale dependences of the parton density show characteristic features of photon structure, and a suppression of this structure with increasing \(Q^2\) is seen.

Published
2000
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43. Antagonism and symbiotic control

Author

Daffonchio, D., Pajoro, M., Gonella, E., Crotti, E., Rizzi, A., Clementi, E., Negri, I., Damiani, Claudia, Raddadi, N., Ricci, Irene, Marzorati, M., Cherif, A., Genchi, M., Ferri, E., Favia, Guido, Sacchi, L., Bandi, C., and Alma, A.

Published
2007

44. Limits for the central production of Θ+ and Ξ-- pentaquarks in 920 GeV pA collsions

Author

Abt, I., Adams, M., Albrecht, H., Amaral, V., Amorim, A., Aplin, S., Aushev, V., Bagaturia, Y., Balagura, V., Bargiotti, M., Barsukova, O., Bastos, J., Bauer, C., Bauer, T., Belkov, A., Belotelov, I., Bertin, A., Bobchenko, B., Boecker, M., Bogatyrev, A., Bohm, G., Braeuer, M., Bruinsma, M., Bruschi, M., Buchholz, P., Buran, T., Carvalho, J., Conde, P., Cruse, C., Dam, M., Danielsen, K., Danilov, M., De Castro, S., Deppe, H., Dong, X., Dreis, H., Egorytchev, V., Ehret, K., Eisele, F., Emeliyanov, D., Essenov, S., Fabbri, L., Faccioli, P., Feuerstack-Raible, M., Flammer, J., Fleckenstein, H., Fominykh, B., Funcke, M., Garrido, L., Giacobbe, B., Glaess, J., Goloubkov, D., Goloubkov, Y., Golutvin, A., Golutvin, I., Gorbounov, I., Gorisek, A., Gouchtchine, O., Goulart, D., Gradl, S., Gradl, W., Guilitsky, Y., Hansen, J., Hernandez, J., Hofmann, W., Hott, T., Hulsbergen, W., Husemann, U., Igonkina, O., Ispiryan, M., Jagla, T., Jiang, C., Kapitza, H., Karabekyan, S., Karpenko, N., Keller, S., Khasanov, F., Kiryushin, Y., Knöpfle, K., Kolanoski, H., Korpar, S., Krauss, C., Kreuzer, P., Krizan, P., Kruecker, D., Kvaratskheliia, T., Lanyov, A., Lau, K., Lewendel, B., Lohse, T., Maenner, R., Masciocchi, S., Massa, I., Matchikhilian, L., Medin, G., Medinnis, M., Mevius, M., Michetti, A., Mikhailov, Y., Mizuk, R., Muresan, R., Negodaev, M., Negri, I., Noerenberg, M., Nowak, S., Nunez Pardo de Vera, M., Ouchrif, M., Ould-Saada, F., Padilla, C., Peralta, D., Pernack, R., Pestotnik, R., Piccinini, M., Pleier, M., Poli, M., Popov, V., Pose, A., Pose, D., Pugatch, V., Pylypchenko, Y., Pyrlik, J., Reeves, K., Ressing, D., Riechmann, K., Riu, I., Robmann, P., Rybnikov, V., Sanchez, F., Sbrizzi, A., Schmelling, M., Schmidt, B., Schreiner, A., Schroeder, H., Schwartz, A., Schwarz, A., Schwenninger, B., Schwingenheuer, B., Sciacca, F., Semprini-Cesari, N., Shuvalov, S., Sozuer, L., Solunin, S., Somov, A., Somov, S., Spengler, J., Spighi, R., Spiridonov, A., Stanovnik, A., Staric, M., Stegmann, C., Symalla, M., Tikhomirov, I., Titov, M., Tsakov, I., Uwer, U., Vagnoni, V., van Eldik, C., Vassiliev, Y., Villa, M., Vitale, A., Vukotic, I., Wahlberg, H., Walenta, A., Walter, M., Wang, J., Wegener, D., Werthenbach, U., Wolters, H., Wurth, R., Wurz, A., Xella-Hansen, S., Zaitsev, Y., Zavertyaev, M., Zech, G., Zeuner, T., Zhelezov, A., Zheng, Z., Zimmermann, R., Zivko, T., Zoccoli, A., Agari, M., Aleksandrov, A., Batista, J., Grimaldi, F., Kessler, J., Kupper, S., zur Nedden, M., Prystupa, S., Rick, H., Rostovtseva, I., Silva, L., Smirnov, K., and Subramania, H.

Abstract

We have searched for Theta^+(1540) and Xi^{--}(1862) pentaquark candidates in proton-induced reactions on C, Ti and W targets at mid-rapidity and \sqrt{s} = 41.6 GeV. In 2x10^8 inelastic events we find no evidence for narrow (sigma~5 MeV) signals in the Theta^+ -> pK_s and Xi^{--} -> Xi^-pi^- channels; our 95% CL upper limits (UL) for the inclusive production cross section times branching fraction Bx(dsigma/dy)|_{y~0} are 3.7 and 2.5 microb/N. The UL of the yield ratio of [Theta^+ / Lambda(1520)] < 2.7% is significantly lower than model predictions. Our UL of [BxXi^{--} / Xi(1530)^0] < 4% is at variance with the results that have provided first evidence for the Xi^{--} signal.

Published
2004

46. Inclusive $\mathrm{V^0}$ production cross sections from 920 GeV fixed target proton-nucleus collisions

Author

Abt, I., Abyzov, A., Aushev, V., Harr, R., Hast, C., Hausmann, S., Hernandez, J. M., Hildebrandt, M., Holscher, A., Hoepfner, K., Hofmann, W., Hohlmann, M., Hott, T., Bagaturiya, Yu., Hulsbergen, W., Husemann, U., Igonkina, O., Ispirian, M., Issever, S., Itterbeck, H., Ivarsson, J., Jagla, T., Jia, Y., Jiang, C., Baghshetsyan, R., Kaoukher, A., Kapitza, H., Karabekian, S., Karchin, P., Karpenko, N., Ke, Z., Keller, S., Khasanov, F., Kim, H., Kiryushin, Yu., Balagura, V., Kisel, I., Klefenz, F., Knopfle, K. T., Kochetkov, V., Kolanoski, H., Korpar, S., Krauss, C., Kreuzer, P., Krizan, P., Krucker, D., Bargiotti, M., Kvaratskheliya, T., Lange, Arnd, Lanyov, A., Lau, K., Leffers, G., Legrand, I., Lewendel, B., Liu, Y. Q., Lohse, T., Loke, R., Barsuk, S., Lomonosov, B., Ludemann, J., Manner, R., Mankel, R., Marconi, U., Masciocchi, S., Massa, I., Matchikhilian, I., Medin, G., Medinnis, M., Barsukova, O., Mevius, M., Michetti, A., Mikhailov, Yu., Miquel, R., Mizuk, R., Mohapatra, A., Moshkin, A., Moshous, B., Muresan, R., Nam, S., Bassetti, V., Negodaev, M., Negri, I., Norenberg, M., Nowak, S., Nunez Pardo de Vera, M. T., Oest, T., Oliveira, A., Ouchrif, M., Ould-Saada, F., Padilla, C., Bastos, J., Pakhlov, P., Pavlenko, Yu., Peralta, D., Pernack, R., Perschke, T., Pestotnik, R., Petersen, B. A., Piccinini, M., Pleier, Marc-Andre, Poli, M., Bauer, C., Popov, V., Pose, A., Pose, D., Potashnikova, I., Pugatch, V. M., Pylypchenko, Y., Pyrlik, J., Ramachandran, S., Ratnikov, F., Reeves, K., Adams, M., Bauer, T. S., Ressing, D., Riechmann, K., Rieling, J., Rietz, M., Riu, I., Robmann, P., Rosen, J., Rothe, C., Ruckstuhl, W., Rusinov, V., Beck, M., Rybnikov, V., Ryzhikov, D., Saadi-Ludemann, F., Samtleben, D., Sanchez, F., Sang, M., Savelev, V., Sbrizzi, A., Schaller, S., Schlein, P., Belkov, A., Schmelling, M., Schmidt, B., Schmidt, S., Schmidt-Parzefall, W., Schreiner, A., Schroder, H., Schultz, H. D., Schwanke, U., Schwartz, Alan J., Schwarz, Andreas S., Belotelov, I., Schwenninger, B., Schwingenheuer, B., Schwitters, R., Sciacca, F., Semenov, S., Semprini-Cesari, N., Sexauer, E., Seybold, L., Shiu, J., Shuvalov, S., Belyaev, I., Siccama, I., Skrk, D., Sozuer, L., Soldatov, A., Solunin, S., Somov, A., Somov, S., Suvorov, V., Spahn, M., Spengler, J., Berkhan, K., Spighi, R., Spiridonov, A., Spratte, S., Stanovnik, A., Staric, M., St. Denis, Richard Dante, Stegmann, C., Steinbeck, S., Steinkamp, O., Stieler, D., Bertin, A., Straumann, U., Sun, F., Sun, H., Symalla, M., Takach, S., Tesch, N., Thurn, H., Tikhomirov, I., Titov, Maxim P., Trunk, U., Bobchenko, B., Truoel, Peter, Tsakov, I., Uwer, U., Vagnoni, V., van Eldik, C., van Staa, R., Vasilev, Yu., Villa, M., Vitale, A., Vukotic, I., Bocker, M., Wagner, G., Wagner, W., Wahlberg, H., Walenta, A. H., Walter, M., Walter, T., Wang, J. J., Wang, Y. M., Wanke, R., Wegener, D., Bogatyrev, A., Werthenbach, U., Weyers, P. J., Wolters, H., Wurth, R., Wurz, A., Xella Hansen, S., Yang, J., Zaitsev, Yu., Zavertyaev, M., Zech, Gunter, Albrecht, H., Bohm, G., Zeuner, T., Zhelezov, A., Zheng, Z., Zhu, Z., Zimmermann, R., Zivko, T., Zoccoli, A., Zweizig, J., HERA-B Collaboration, Borgmeier, C., Brauer, M., Broemmelsiek, D., Bruinsma, M., Bruschi, M., Buchholz, P., Buchler, M., Buran, T., Capeans, M., Amaral, V., Capponi, M., Carvalho, J., Chamanina, J., Chen, B. X., Chistov, R., Chmeissani, M., Christensen, A., Conde, P., Cruse, C., Dam, M., Amorim, A., Danielsen, K. M., Danilov, M., De Castro, S., Deckers, H., Dehmelt, K., Deppe, H., Dolgoshein, B., Dong, X., Dreis, H. B., Dressel, M., Aplin, S. J., Dujmic, D., Eckmann, R., Egorychev, V., Ehret, K., Eiges, V., Eisele, F., Emelyanov, D., Erhan, S., Essenov, S., Fabbri, L., Arefev, A., Faccioli, P., Fallot-Burghardt, W., Feuerstack-Raible, M., Flammer, J., Fleckenstein, H., Fominykh, B., Fourletov, S., Fuljahn, T., Funcke, M., Galli, D., Arino, I., Garcia, A., Garrido, L., Gascon, D., Gellrich, A., Gerndt, K. E. K., Giacobbe, B., Glass, J., Glebe, T., Goloubkov, D., Golutvin, A., Atiya, M., Golutvin, I., Gorbunov, I., Gorisek, A., Gouchtchine, O., Goulart, D. C., Gradl, S., Gradl, W., Gilitsky, Yu., Hamacher, T., and Hansen, J. D.

Subjects
Lambda, tungsten, carbon, Antilambda, x-dependence [differential cross section], transverse momentum dependence, HERA-B, ratio [differential cross section], DESY HERA Stor, aluminum, K0(S), ddc:530, hadroproduction [strange particle], titanium, mass number [channel cross section], 920 GeV, inclusive reaction [p nucleus], experimental results
Abstract

Inclusive differential cross sections $d\sigma_{pA}/dx_F$ and $d\sigma_{pA}/dp_t^2$ for the production of \kzeros, \lambdazero, and \antilambda particles are measured at HERA in proton-induced reactions on C, Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to $\sqrt {s} = 41.6$ GeV in the proton-nucleon system. The ratios of differential cross sections \rklpa and \rllpa are measured to be $6.2\pm 0.5$ and $0.66\pm 0.07$, respectively, for \xf $\approx-0.06$. No significant dependence upon the target material is observed. Within errors, the slopes of the transverse momentum distributions $d\sigma_{pA}/dp_t^2$ also show no significant dependence upon the target material. The dependence of the extrapolated total cross sections $\sigma_{pA}$ on the atomic mass $A$ of the target material is discussed, and the deduced cross sections per nucleon $\sigma_{pN}$ are compared with results obtained at other energies.

Published
2003
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47. Measurement of the b(b)over-bar production cross section in 920 GeV fixed-target proton-nucleus collisions

Author

Abt, I., Abyzov, A., Adams, M., Albrecht, H., Amaral, V., Amorim, A., Aplin, S., Arefiev, A., Arino, I., Atiya, M., Aushev, V., Bagaturia, Y., Baghshetsyan, R., Balagura, V., Bargiotti, M., Barsuk, S., Barsukova, O., Bassetti, V., Bastos, J., Bauer, C., Bauer, T., Beck, M., Belkov, A., Belotelov, I., Belyaev, I., Berkhan, K., Bertin, A., Bobchenko, B., Bocker, M., Bogatyrev, A., Bohm, G., Borgmeier, C., Bräuer, M., Broemmelsiek, D., Bruinsma, M., Bruschi, M., Buchholz, P., Buchler, M., Buran, T., Capeans, M., Capponi, M., Carvalho, J., Chamanina, J., Chen, B., Chistov, R., Chmeissani, M., Christensen, A., Conde, P., Cruse, C., Dam, M., Danielsen, K., Danilov, M., De Castro, S., Deckers, H., Dehmelt, K., Deppe, H., Dolgoshein, B., Dong, X., Dreis, H., Dressel, M., Dujmic, D., Eckmann, R., Egorytchev, V., Ehret, K., Eiges, V., Eisele, F., Emeliyanov, D., Erhan, S., Essenov, S., Fabbri, L., Faccioli, P., Fallot-Burghardt, W., Feuerstack-Raible, M., Flammer, J., Fleckenstein, H., Fominykh, B., Fourletov, S., Fuljahn, T., Funcke, M., Galli, D., Garcia, A., Garrido, L., Gascon, D., Gellrich, A., Gerndt, K., Giacobbe, B., Glass, J., Glebe, T., Goloubkov, D., Golutvin, A., Golutvin, I., Gorbounov, I., Gorisek, A., Gouchtchine, O., Goulart, D., Gradl, S., Gradl, W., Guilitsky, Y., Hamacher, T., Hansen, J., Harr, R., Hast, C., Hausmann, S., Hernandez, J., Hildebrandt, M., Hoscher, A., Hofner, K., Hofmann, W., Hohlmann, M., Hott, T., Hulsbergen, W., Husemann, U., Igonkina, O., Ispiryan, M., Issever, S., Itterbeck, H., Ivarsson, J., Jagla, T., Jia, Y., Jiang, C., Kaoukher, A., Kapitza, H., Karabekyan, S., Karchin, P., Karpenko, N., Ke, Z., Keller, S., Khasanov, F., Kim, H., Kiryushin, Y., Kisel, I., Klefenz, F., Knöpfle, K., Kochetkov, V., Kolanoski, H., Korpar, S., Krauss, C., Kreuzer, P., Krizan, P., Krucker, D., Kvaratskheliia, T., Lange, A., Lanyov, A., Lau, K., Leffers, G., Legrand, I., Lewende, B., Liu, Y., Lohse, T., Loke, R., Lomonosov, B., Luidemann, J., Manner, R., Mankel, R., Marconi, U., Masciocchi, S., Massa, I., Matchikhilian, L., Medin, G., Medinnis, M., Mevius, M., Michetti, A., Mikhailov, Y., Miquel, R., Mizuk, R., Mohapatra, A., Moshkin, A., Moshous, B., Muresan, R., Nam, S., Negodaev, M., Negri, I., Norenberg, M., Nowak, S., de Vera, M., Oest, T., Oliveira, A., Ouchrif, M., Ould-Saada, F., Padilla, C., Pakhlov, P., Pavlenko, Y., Peralta, D., Pernack, R., Perschke, T., Pestotnik, R., Petersen, B., Piccinini, M., Pleier, M., Poli, M., Popov, V., Pose, A., Pose, D., Pugatch, V., Pylypchenko, Y., Pyrlik, J., Ramachandran, S., Ratnikov, F., Reeves, K., Ressing, D., Riechmann, K., Rieling, J., Rietz, M., Riu, I., Robmann, P., Rosen, J., Rothe, C., Ruckstuhl, W., Rusinov, V., Rybnikov, V., Ryzhikov, D., Saadi-Ludemannm, F., Samtleben, D., Sanchez, F., Sang, M., Saveliev, V., Sbrizzi, A., Schaller, S., Schlein, P., Schmelling, M., Schmidt, B., Schmidt, S., Schmidt-Parzefall, W., Schreiner, A., Schroder, H., Schultz, H., Schwanke, U., Schwartz, A., Schwarz, A., Schwenninger, B., Schwingenheuer, B., Schwitters, R., Sciacca, F., Semenov, S., Semprini-Cesari, N., Sexauer, E., Seybold, L., Shiu, J., Shuvalov, S., Siccama, I., Skrk, D., Sozuer, L., Soldatov, A., Solunin, S., Somov, A., Somov, S., Souvorov, V., Spahn, M., Spengler, J., Spighi, R., Spiridonov, A., Spratte, S., Stanovnik, A., Staric, M., StDenis, R., Stegmann, C., Steinbeck, S., Steinkamp, O., Stieler, D., Straumann, U., Sun, F., Sun, H., Symalla, M., Takach, S., Tesch, N., Thurn, H., Tikhomirov, I., Titov, M., Trunk, U., Truol, P., Tsakov, I., Uwer, U., Vagnoni, V., van Eldik, C., van Staa, R., Vassiliev, Y., Villa, M., Vitale, A., Vukotic, I., Wagner, G., Wagner, W., Wahlberg, H., Walenta, A., Walter, M., Walter, T., Wang, J., Wang, Y., Wanke, R., Wegener, D., Werthenbach, U., Weyers, P., Wolters, H., Wurth, R., Wurz, A., Xella-Hansen, S., Yang, J., Zaitsev, Y., Zavertyaev, M., Zech, G., Zeuner, T., Zhelezov, A., Zheng, Z., Zhu, Z., Zimmermann, R., Zivko, T., Zoccoli, A., and Zweizig, J.

Subjects
High Energy Physics::Phenomenology, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Using the HERA-B detector, the b (b) over bar production cross section has been measured in 920 GeV proton collisions on carbon and titanium targets. The b (b) over bar production was tagged via inclusive bottom quark decays into J/psi by exploiting the longitudinal separation of J/psi --> l(+)l(-) decay vertices from the primary proton-nucleus interaction. Both e(+)e(-) and mu(+)mu(-) channels have been reconstructed and the combined analysis yields the cross section sigma(b (b) over bar) = 32(-12)(+14)(stat) (+6)(-7)(sys) nb/nucleon.

Published
2003

48. A search for excited fermions at HERA

Author

Adloff, C, Andreev, V, Andrieu, B, Arkadov, V, Astvatsatourov, A, Ayyaz, I, Babaev, A, Bahr, J, Baranov, P, Barrelet, E, Bartel, W, Bassler, U, Bate, P, Beglarian, A, Behnke, O, Beier, C, Belousov, A, Benisch, T, Berger, C, Bernardi, G, Berndt, T, Bizot, JC, Borras, K, Boudry, V, Braunschweig, W, Brisson, V, Broker, HB, Brown, DP, Bruckner, W, Bruel, P, Bruncko, D, Burger, J, Busser, FW, Bunyatyan, A, Burkhardt, H, Burrage, A, Buschhorn, G, Campbell, AJ, Cao, J, Carli, T, Caron, S, Chabert, E, Clarke, D, Clerbaux, B, Collard, C, Contreras, JG, Coughlan, JA, Cousinou, MC, Cox, BE, Cozzika, G, Cvach, J, Dainton, JB, Dau, WD, Daum, K, Davidsson, M, Delcourt, B, Delerue, N, Demirchyan, R, De Roeck, A, De Wolf, EA, Diaconu, C, Dixon, P, Dodonov, V, Dowell, JD, Droutskoi, A, Duprel, C, Eckerlin, G, Eckstein, D, Efremenko, V, Egli, S, Eichler, R, Eisele, F, Eisenhandler, E, Ellerbrock, M, Elsen, E, Erdmann, M, Erdmann, W, Faulkner, PJW, Favart, L, Fedotov, A, Felst, R, Ferencei, J, Ferron, S, Fleischer, M, Flugge, G, Fomenko, A, Foresti, I, Formanek, J, Foster, JM, Franke, G, Gabathuler, E, Gabathuler, K, Garvey, J, Gassner, J, Gayler, J, Gerhards, R, Ghazaryan, S, Goerlich, L, Gogitidze, N, Goldberg, M, Goodwin, C, Grab, C, Grassler, H, Greenshaw, T, Grindhammer, G, Hadig, T, Haidt, D, Hajduk, L, Haynes, WJ, Heinemann, B, Heinzelmann, G, Henderson, RCW, Hengstmann, S, Henschel, H, Heremans, R, Herrera, G, Herynek, I, Hilgers, M, Hiller, KH, Hladky, J, Hoting, P, Hoffmann, D, Hoprich, W, Horisberger, R, Hurling, S, Ibbotson, M, Issever, C, Jacquet, M, Jaffre, M, Janauschek, L, Jansen, DM, Janssen, X, Jemanov, V, Jonsson, L, Johnson, DP, Jones, MAS, Jung, H, Kastli, HK, Kant, D, Kapichine, M, Karlsson, M, Karschnick, O, Kaufmann, O, Kausch, M, Keil, F, Keller, N, Kennedy, J, Kenyon, IR, Kermiche, S, Kiesling, C, Klein, M, Kleinwort, C, Knies, G, Koblitz, B, Kolya, SD, Korbel, V, Kostka, P, Kotelnikov, SK, Krasny, MW, Krehbiel, H, Kroseberg, J, Kruger, K, Kupper, A, Kuhr, T, Kurca, T, Kutuev, R, Lachnit, W, Lahmann, R, Lamb, D, Landon, MPJ, Lange, W, Lastovicka, T, Lebailly, E, Lebedev, A, Leissner, B, Lemrani, R, Lendermann, V, Levonian, S, Lindstroem, M, Lobodzinska, E, Lobodzinski, B, Loktionova, N, Lubimov, V, Luders, S, Luke, D, Lytkin, L, Magnussen, N, Mahlke-Kruger, H, Malden, N, Malinovski, E, Malinovski, I, Maracek, R, Marage, P, Marks, J, Marshall, R, Martyn, HU, Martyniak, J, Maxfield, SJ, Mehta, A, Meier, K, Merkel, P, Metlica, F, Meyer, H, Meyer, J, Meyer, PO, Mikocki, S, Milstead, D, Mkrtchyan, T, Mohr, R, Mohrdieck, S, Mondragon, MN, Moreau, F, Morozov, A, Morris, JV, Muller, K, Murin, P, Nagovizin, V, Naroska, B, Naumann, J, Naumann, T, Negri, I, Nellen, G, Newman, PR, Nicholls, TC, Niebergall, F, Niebuhr, C, Nix, O, Nowak, G, Nunnemann, T, Olsson, JE, Ozerov, D, Panassik, V, Pascaud, C, Patel, GD, Perez, E, Phillips, JP, Pitzl, D, Poschl, R, Potachnikova, I, Povh, B, Rabbertz, K, Radel, G, Rauschenberger, J, Reimer, P, Reisert, B, Reyna, D, Riess, S, Rizvi, E, Robmann, P, Roosen, R, Rostovtsev, A, Royon, C, Rusakov, S, Rybicki, K, Sankey, DPC, Scheins, J, Schilling, FP, Schleper, P, Schmidt, D, Schmitt, S, Schoeffel, L, Schoning, A, Schorner, T, Schroder, V, Schultz-Coulon, HC, Sedlak, K, Sefkow, F, Shekelyan, V, Sheviakov, I, Shtarkov, LN, Siegmon, G, Sievers, P, Sirois, Y, Sloan, T, Smirnov, P, Solochenko, V, Soloviev, Y, Spaskov, V, Specka, A, Spitzer, H, Stamen, R, Steinhart, J, Stella, B, Stellberger, A, Stiewe, J, Straumann, U, Struczinski, W, Swart, M, Tasevsky, M, Tchernyshov, V, Tchetchelnitski, S, Thompson, G, Thompson, PD, Tobien, N, Traynor, D, Truol, P, Tsipolitis, G, Turnau, J, Turney, JE, Tzamariudaki, E, Udluft, S, Usik, A, Valkar, S, Valkarova, A, Vallee, C, Van Mechelen, P, Vazdik, Y, von Dombrowski, S, Wacker, K, Wallny, R, Walter, T, Waugh, B, Weber, G, Weber, M, Wegener, D, Wegner, A, Wengler, T, Werner, M, White, G, Wiesand, S, Wilksen, T, Winde, M, Winter, GG, Wissing, C, Wobisch, M, Wollatz, H, Wunsch, E, Wyatt, AC, Zacek, J, Zalesak, J, Zhang, Z, Zhokin, A, Zomer, F, Zsembery, J, zur Nedden, M, Collaboration, H, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, H1 Collaboration, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Coupling constant, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Hadron, Electroweak interaction, FOS: Physical sciences, Fermion, HERA, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, law.invention, High Energy Physics - Experiment (hep-ex), law, Excited state, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Collider, Engineering (miscellaneous), Lepton
Abstract

A search for excited fermions f^* of the first generation in e^+p scattering at the collider HERA is presented using H1 data with an integrated luminosity of 37 pb^(-1). All electroweak decays of excited fermions, f^* -> f gamma, f W, f Z are considered and all possible final states resulting from the Z or W hadronic decays or decays into leptons of the first two generations are taken into account. No evidence for f^* production is found. Mass dependent exclusion limits on cross-sections and on the ratio of coupling constants to the compositeness scale are derived., 27 pages, 12 figures, 5 tables

Published
2000

49. Di-jet event rates in deep-inelastic scattering at HERA

Author

Adloff, C, Aid, S, Anderson, M, Andreev, V, Andrieu, B, Arkadov, V, Arndt, C, Ayyaz, I, Babaev, A, Bahr, J, Ban, J, Baranov, P, Barrelet, E, Barschke, R, Bartel, T, Bassler, U, Beck, M, Behrend, HJ, Beier, C, Belousov, A, Berger, C, Bernardi, G, Bertrand-Coremans, G, Beyer, R, Biddulph, P, Bizot, JC, Borras, K, Boudry, V, Bourov, S, Braemer, A, Braunschweig, W, Brisson, V, Brown, DP, Bruckner, W, Bruel, P, Bruncko, D, Brune, C, Burger, J, Busser, FW, Buniatian, A, Burke, S, Buschhorn, G, Calvet, D, Campbell, AJ, Carli, T, Charlet, M, Clarke, D, Clerbaux, B, Cocks, S, Contreras, JG, Cormack, C, Coughlan, JA, Cousinou, MC, Cox, BE, Cozzika, G, Cvach, J, Dainton, JB, Dau, WD, Daum, K, David, M, Davidsson, M, De Roeck, A, De Wolf, EA, Delcourt, B, Dirkmann, M, Dixon, P, Dlugosz, W, Donovan, KT, Dowell, JD, Droutskoi, A, Ebert, J, Ebert, TR, Eckerlin, G, Efremenko, T, Egli, S, Eichler, R, Eisele, F, Eisenhandler, E, Elsen, E, Erdmann, M, Fahr, AB, Favart, L, Fedotov, A, Felst, R, Feltesse, J, Ferencei, J, Ferrarotto, F, Flamm, K, Fleischer, M, Flieser, M, Flugge, G, Fomenko, A, Formanek, J, Foster, JM, Franke, G, Gabathuler, E, Gabathuler, K, Gaede, F, Garvey, J, Gayler, J, Gebauer, M, Gerhards, R, Glazov, A, Goerlich, L, Gogitidze, N, Goldberg, M, Gorelov, I, Grab, C, Graissler, K, Greenshaw, T, Griffiths, RK, Grindhammer, G, Gruber, A, Gruber, C, Hadig, T, Haidt, D, Hajduk, L, Haller, T, Hampel, M, Haynes, WJ, Heinemann, B, Heinzelmann, G, Henderson, RCW, Hengstmann, S, Henschel, H, Heremans, R, Herynek, I, Hewitt, K, Hiller, KH, Hilton, CD, Hladky, J, Hoppner, M, Hoffmann, D, Holtom, T, Horisberger, R, Hudgson, VL, Hutte, M, Ibbotson, M, Issever, C, Itterbeck, H, Jacquet, M, Jaffre, M, Janoth, J, Jansen, DM, Jonsson, L, Johnson, DP, Jung, H, Kalmus, PIP, Kander, M, Kant, D, Karlsson, M, Kathage, U, Katzy, J, Kaufmann, HH, Kaufmann, O, Kausch, M, Kazarian, S, Kenyon, IR, Kermiche, S, Keuker, C, Kiesling, C, Klein, M, Kleinwort, C, Knies, G, Kohne, JH, Kolanoski, H, Kolya, SD, Korbel, V, Kostka, P, Kotelnikov, SK, Kramerkamper, T, Krasny, MW, Krehbiel, K, Krucker, D, Kupper, A, Kuster, H, Kuhlen, M, Kurca, T, Laforge, B, Lahmann, R, Landon, MPJ, Lange, W, Langenegger, U, Lebedev, A, Lehner, F, Lemaitre, V, Levonian, S, Lindstroem, M, Lipinski, J, List, B, Lobo, G, Lopez, GC, Lubimov, V, Luke, D, Lytkin, L, Magnussen, N, Mahlke-Kruger, H, Malinovski, E, Maracek, R, Marage, P, Marks, J, Marshall, R, Martens, J, Martin, G, Martin, R, Martyn, HU, Martyniak, J, Maxfield, SJ, McMahon, SJ, Mehta, A, Meier, K, Merkel, P, Metlica, F, Meyer, A, Meyer, H, Meyer, J, Meyer, PO, Migliori, A, Mikocki, S, Milstead, D, Moeck, J, Moreau, F, Morris, JV, Mroczko, E, Muller, D, Muller, K, Murin, H, Nagovizin, V, Nahnhauer, R, Naroska, B, Naumann, T, Negri, I, Newman, RP, Newton, D, Nguyen, HK, Nicholls, TC, Niebergall, F, Niebuhr, C, Niedzballa, C, Niggli, H, Nowak, G, Nunnemann, T, Oberlack, H, Olsson, JE, Ozerov, D, Palmen, P, Panaro, E, Panitch, A, Pascaud, C, Passaggio, S, Patel, GD, Pawletta, H, Peppel, E, Perez, E, Phillips, JP, Pieuchot, A, Pitzl, D, Poschl, R, Pope, G, Povh, B, Rabbertz, K, Reimer, P, Rick, H, Riess, S, Rizvi, E, Robmann, P, Roosen, R, Rosenbauer, K, Rostovtsev, A, Rouse, F, Royon, C, Ruter, K, Rusakov, S, Rybicki, K, Sankey, DPC, Schacht, P, Scheins, J, Schiek, S, Schleif, S, von Schlippe, W, Schmidt, D, Schmidt, G, Schoeffel, L, Schoning, A, Schroder, V, Schuhmann, E, Schultz-Coulon, HC, Schwab, B, Sefkow, F, Semenov, A, Shekelyan, V, Sheviakov, I, Shtarov, LN, Siegmon, G, Siewert, U, Sirois, Y, Skillicorn, IO, Sloan, T, Smirnov, P, Smith, M, Solochenko, V, Soloviev, Y, Specka, A, Spiekermann, J, Spielman, S, Spitzer, H, Squinabol, F, Steffen, P, Steinberg, R, Steinhart, J, Stella, B, Stellberger, A, Stiewe, J, Stolze, K, Straumann, U, Struczinski, W, Sutton, JP, Swart, M, Tapprogge, S, Tasevsky, M, Tchernyshov, V, Tchetchelnitski, S, Theissen, J, Thompson, G, Thompson, PD, Tobien, N, Todenhagen, R, Truol, P, Zalesak, J, Tsipolitis, G, Turnau, J, Tzamariudaki, E, Uelkes, P, Usik, A, Valkar, S, Valkarova, A, Vallee, C, Van Esch, P, Van Mechelen, P, Vandenplas, D, Vazdik, Y, Verrecchia, P, Villet, G, Wacker, K, Wagener, A, Wagener, M, Wallny, R, Walter, T, Waugh, B, Weber, G, Weber, M, Wegener, D, Wegner, A, Wengler, T, Werner, M, West, LR, Wiesand, S, Wilksen, T, Willard, S, Winde, M, Winter, GG, Wittek, C, Wobisch, M, Wollatz, H, Wunsch, E, Zacek, J, Zarbock, D, Zhang, Z, Zhokin, A, Zini, P, Zomer, F, Zsembery, J, zurNedden, M, and Collaboration, H

Published
2000

50. Measurements of transverse energy flow in deep inelastic scattering at Hera

Author

Adloff, C., Andreev, V., Andrieu, B., Arkadov, V., Astvatsatourov, A., Ayyaz, I., Babaev, A., Bahr, J., Baranov, P., Barrelet, E., Bartel, W., Bassler, U., Bate, P., Beglarian, A., Behnke, O., Behrend, H.J., Beier, C., Belousov, A., Berger, C., Bernardi, G., Berndt, T., Bertrand-Coremans, G., Biddulph, P., Bizot, J.C., Boudry, V., Braunschweig, W., Brisson, V., Broker, H.B., Brown, D.P., Bruckner, W., Bruel, Pascal, Bruncko, D., Burger, J., Busser, F.W., Bunyatian, A., Burke, S., Burrage, A., Buschhorn, G., Calvet, D., Campbell, A.J., Carli, T., Chabert, E., Charlet, M., Clarke, D., Clerbaux, B., Contreras, J.G., Cormack, C., Coughlan, J.A., Cousinou, M.C., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., David, M., Davidsson, M., De Roeck, A., De Wolf, E.A., Delcourt, B., Demirchyan, R., Diaconu, C., Dirkmann, M., Dixon, P., Dodonov, V., Donovan, K.T., Dowell, J.D., Droutskoi, A., Ebert, J., Eckerlin, G., Eckstein, D., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Elsen, E., Enzenberger, M., Erdmann, M., Fahr, A.B., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Ferron, S., Fleischer, M., Flugge, G., Fomenko, A., Formanek, J., Foster, J.M., Franke, G., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gassner, J., Gayler, J., Gerhards, R., Ghazaryan, S., Glazov, A., Goerlich, L., Gogitidze, N., Goldberg, M., Gorelov, I., Grab, C., Grassler, H., Greenshaw, T., Griffiths, R.K., Grindhammer, G., Hadig, T., Haidt, D., Hajduk, L., Hampel, M., Haustein, V., Haynes, W.J., Heinemann, B., Heinzelmann, G., Henderson, R.C.W., Hengstmann, S., Henschel, H., Heremans, R., Herrera, G., Herynek, I., Hewitt, K., Hilgers, M., Hiller, K.H., Hilton, C.D., Hladky, J., Hoting, P., Hoffmann, D., Horisberger, R., Hurling, S., Ibbotson, M., Issever, C., Jacquet, M., Jaffre, M., Janauschek, L., Jansen, D.M., Jonsson, L., Johnson, D.P., Jones, M., Jung, H., Kastli, H.K., Kander, M., Kant, D., Kapichine, M., Karlsson, M., Karschnick, O., Kaufmann, O., Kausch, M., Keil, F., Keller, N., Kenyon, I.R., Kermiche, S., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Kohne, J.H., Kolanoski, H., Kolya, S.D., Korbel, V., Kostka, P., Kotelnikov, S.K., Kramerkamper, T., Krasny, M.W., Krehbiel, H., Krucker, D., Kruger, K., Kupper, A., Kuster, H., Kuhlen, M., Kurca, T., Lachnit, W., Lahmann, R., Lamb, D., Landon, M.P.J., Lange, W., Langenegger, U., Lebedev, A., Lehner, F., Lemaitre, V., Lemrani, R., Lendermann, V., Levonian, S., Lindstroem, M., Lobo, G., Lobodzinska, E., Lubimov, V., Luders, S., Luke, D., Lytkin, L., Magnussen, N., Mahlke-Kruger, H., Malden, N., Malinovskii, E., Malinovski, I., Maracek, R., Marage, P., Marks, J., Marshall, R., Martyn, H.U., Martyniak, J., Maxfield, S.J., McMahon, T.R., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P.O., Mikocki, S., Milstead, D., Mohr, R., Mohrdieck, S., Mondragon, M.N., Moreau, F., Morozov, A., Morris, J.V., Muller, D., Muller, K., Murin, P., Nagovizin, V., Naroska, B., Naumann, J., Naumann, T., Negri, I., Newman, P.R., Nguyen, H.K., Nicholls, T.C., Niebergall, F., Niebuhr, C., Niedzballa, C., Niggli, H., Nix, O., Nowak, G., Nunnemann, T., Oberlack, H., Olsson, J.E., Ozerov, D., Palmen, P., Panassik, V., Pascaud, C., Passaggio, S., Patel, G.D., Pawletta, H., Perez, Emile, Phillips, J.P., Pieuchot, A., Pitzl, D., Poschl, R., Potashnikova, I., Povh, B., Rabbertz, K., Radel, G., Rauschenberger, J., Reimer, P., Reisert, B., Reyna, D., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rosenbauer, K., Rostovtsev, A., Royon, C., Rusakov, S., Rybicki, K., Sankey, D.P.C., Schacht, P., Scheins, J., Schilling, F.P., Schleif, S., Schleper, P., Schmidt, D., Schoeffel, L., Schorner, T., Schroder, V., Schultz-Coulon, H.C., Sefkow, F., Shekelian, V., Sheviakov, I., Shtarkov, L.N., Siegmon, G., Sirois, Y., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Solovev, Yu., Spaskov, V., Specka, A., Spitzer, H., Squinabol, F., Stamen, R., Steinhart, J., Stella, B., Stellberger, A., Stiewe, J., Straumann, U., Struczinski, W., Sutton, J.P., Swart, M., Tapprogge, S., Tasevsky, M., Chernyshov, V., Chechelnitski, S., Thompson, G., Thompson, P.D., Tobien, N., Todenhagen, R., Traynor, D., Truol, P., Tsipolitis, G., Turnau, J., Tzamariudaki, E., Udluft, S., Usik, A., Valkar, S., Valkarova, A., Vallee, C., Van Haecke, A., Van Mechelen, P., Vazdik, Ya., Villet, G., Wacker, K., Wallny, R., Walter, T., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L.R., White, G., Wiesand, S., Wilksen, T., Winde, M., Winter, G.G., Wissing, C., Wittek, C., Wobisch, M., Wollatz, H., Wunsch, E., Zacek, J., Zalesak, J., Zhang, Zhiqing, Zhokin, A., Zini, P., Zomer, F., Zsembery, J., Zur Nedden, M., Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Damoiseaux, Magali, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment
Abstract

Measurements of transverse energy flow are presented for neutral current deep-inelastic scattering events produced in positron-proton collisions at HERA. The kinematic range covers squared momentum transfers Q^2 from 3.2 to 2,200 GeV^2, the Bjorken scaling variable x from 8.10^{-5} to 0.11 and the hadronic mass W from 66 to 233 GeV. The transverse energy flow is measured in the hadronic centre of mass frame and is studied as a function of Q^2, x, W and pseudorapidity. A comparison is made with QCD based models. The behaviour of the mean transverse energy in the central pseudorapidity region and an interval corresponding to the photon fragmentation region are analysed as a function of Q^2 and W.

Published
2000

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