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4. Genetic variants in folate metabolism-related genes, serum folate and hepatocellular carcinoma survival: the Guangdong Liver Cancer Cohort study.

Author

Li, Yunshan, Shu, Jing, Tan, Peishan, Dong, Xiaocong, Zhang, Mingjie, He, Tongtong, Yang, Zhijun, Zhang, Xuehong, Giovannucci, Edward L., Liu, Zhaoyan, Zhou, Zhongguo, Li, Qijiong, Xu, Yanjun, Xu, Xiaojun, Peng, Tianyou, Lu, Jialin, Zhang, Yaojun, Zhu, Huilian, and Fang, Aiping

Abstract

Folate metabolism is involved in the development and progression of various cancers. We investigated the association of single nucleotide polymorphisms (SNP) in folate-metabolising genes and their interactions with serum folate concentrations with overall survival (OS) and liver cancer-specific survival (LCSS) of newly diagnosed hepatocellular carcinoma (HCC) patients. We detected the genotypes of six SNP in three genes related to folate metabolism: methylenetetrahydrofolate reductase (MTHFR), 5-methyltetrahydrofolate-homocysteine methyltransferase reductase (MTRR) and 5-methyltetrahydrofolate-homocysteine methyltransferase (MTR). Cox proportional hazard models were used to calculate multivariable-adjusted hazard ratios (HR) and 95 % CI. This analysis included 970 HCC patients with genotypes of six SNP, and 864 of them had serum folate measurements. During a median follow-up of 722 d, 393 deaths occurred, with 360 attributed to HCC. In the fully-adjusted models, the MTRR rs1801394 polymorphism was significantly associated with OS in additive (per G allele: HR = 0·84, 95 % CI: 0·71, 0·99), co-dominant (AG v. AA: HR = 0·77; 95 % CI: 0·62, 0·96) and dominant (AG + GG v. AA: HR = 0·78; 95 % CI: 0·63, 0·96) models. Carrying increasing numbers of protective alleles was linked to better LCSS (HR10–12 v . 2–6 = 0·70; 95 % CI: 0·49, 1·00) and OS (HR10–12 v . 2–6 = 0·67; 95 % CI: 0·47, 0·95). Furthermore, we observed significant interactions on both multiplicative and additive scales between serum folate levels and MTRR rs1801394 polymorphism. Carrying the variant G allele of the MTRR rs1801394 is associated with better HCC prognosis and may enhance the favourable association between higher serum folate levels and improved survival among HCC patients. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Dyotropic Rearrangement of β‐Lactams: Reaction Development, Mechanistic Study, and Application to the Total Syntheses of Tricyclic Marine Alkaloids.

Author

Li, Yunshan, Zhang, Jingyang, Chen, Yi, Pang, Jiahua, Chen, Yuejie, and Tang, Yefeng

Subjects
*REARRANGEMENTS (Chemistry), *NATURAL products, *CHEMOSELECTIVITY
Abstract

An unprecedented dyotropic rearrangement of β‐lactams has been developed, which provides an enabling tool for the synthesis of structurally diverse γ‐butyrolactams. Unlike the well‐established dyotropic rearrangements of β‐lactones, the present reaction probably proceeds through a dual‐activation mode, and thus displays unusual reactivity and chemoselectivity. The combined computational and experimental results suggest that the dyotropic rearrangement of β‐lactams may proceed through different mechanisms depending on the nature of migrating groups (H, alkyl, or aryl). Hinging on a chemoselective H‐migration dyotropic rearrangement of β‐lactams, we have completed the divergent synthesis of tricyclic marine alkaloids (−)‐lepadiformine A, (+)‐cylindricine C, and (−)‐fasicularin within 11–12 longest linear steps. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Vitamin D receptor gene polymorphisms, bioavailable 25-hydroxyvitamin D, and hepatocellular carcinoma survival.

Author

Shu, Jing, Zhang, Mingjie, Dong, Xiaocong, Long, Jingan, Li, Yunshan, Tan, Peishan, He, Tongtong, Giovannucci, Edward L, Zhang, Xuehong, Zhou, Zhongguo, Xu, Yanjun, Xu, Xiaojun, Peng, Tianyou, Lu, Jialin, Chen, Minshan, Zhu, Huilian, Zhang, Yaojun, and Fang, Aiping

Subjects
VITAMIN D receptors, PROPORTIONAL hazards models, VITAMIN D, OVERALL survival, GENETIC polymorphisms
Abstract

Background Little is known about the role of vitamin D receptor polymorphisms and their interaction with vitamin D status in hepatocellular carcinoma (HCC) prognosis. Methods We evaluated the association of TaqI , BsmI , Cdx-2, and ApaI polymorphisms, individually and in combination, with liver cancer-specific (LCSS) and overall survival (OS) among 967 patients with newly diagnosed HCC. Subsequently, we examined whether these polymorphisms modified the association between serum bioavailable 25-hydroxyvitamin D (25OHD) concentrations and survival. Cox proportional hazard models were used to calculate hazard ratios (HRs) and 95% confidence intervals (CIs). Results During a median follow-up of 1017 days, 393 deaths occurred, with 360 attributed to HCC. Having TaqI G allele (HRper allele = 1.30, 95% CI = 1.08 to 1.57) or BsmI T allele (HRper allele = 1.41, 95% CI = 1.01 to 1.99) was associated with worse LCSS. Carrying increasing numbers of protective alleles was associated with superior LCSS (HR6-8 vs 0-3 = 0.52, 95% CI = 0.34 to 0.80). The inverse association of bioavailable 25OHD with LCSS was statistically significant only in patients with TaqI AA (HRQuartile 4 vs Quartile 1 = 0.63, 95% CI = 0.44 to 0.92), BsmI CC (HRQuartile 4 vs Quartile 1 = 0.62, 95% CI = 0.44 to 0.88), and 6 to 8 protective alleles (HRQuartile 4 vs Quartile 1 = 0.45, 95% CI = 0.23 to 0.87). Similar associations were observed for OS. Conclusions Patients carrying wild-type TaqI , BsmI , or more protective alleles had improved survival and might benefit from optimizing bioavailable 25OHD status. [ABSTRACT FROM AUTHOR]

Published
2024
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10. The ELEMI healthcare professional Study

Author

Delanerolle, Gayathri, primary, Li, Yunshan, additional, Cavalini, Heitor, additional, Barnard-Kelly, Katherine, additional, Elliot, Katheryn, additional, Raymont, Vanessa, additional, Pluchino, Nicola, additional, Flores, Idaliz, additional, Elneil, Sohier, additional, Majumder, Kingshuk, additional, Boyd, Amy, additional, Sillem, Martin, additional, Hull, M Louise, additional, O'Hara, Rebecca, additional, Rathod, Shanaya, additional, Shetty, Ashish, additional, shi, Jian qing, additional, Hapangama, Dharani, additional, and Phiri, Peter, additional

Published
2023
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15. TYK2 correlates with immune infiltration: A prognostic marker for head and neck squamous cell carcinoma

Author

He, Yaodong, Li, Yunshan, Xiang, Junwei, Huang, Xu, Zhao, Mingyu, Wang, Yuanyin, and Chen, Ran

Subjects
Genetics, Molecular Medicine, Genetics (clinical)
Abstract

Tyrosine kinase 2 (TYK2) is a member of the Janus kinase (JAK) family and is involved in immune and inflammatory signaling. TYK2 is overexpressed in several types of cancers and promotes the invasion and proliferation of cancer cells. Nevertheless, the roles of TYK2 in the prognosis and immune infiltration of head and neck squamous cell carcinoma (HNSCC) remain to be elucidated. In this study, the expression of TYK2 in HNSCC was evaluated based on the data retrieved from multiple databases and quantitative real-time polymerase chain reaction (qRT-PCR) analysis. The prognostic potential of TYK2 in patients with HNSCC was analyzed by Kaplan-Meier curves and Cox regression analysis. A TYK2-related risk assessment model was subsequently constructed by Least Absolute Shrinkage and Selection Operator (LASSO) regression analysis and stepwise multivariate Cox regression analysis. The association between the expression of TYK2 and the tumor immune microenvironment, immune checkpoints, and drug sensitivity was explored various packages in R. Cell function assays were finally used for exploring the effects of TYK2 on the growth and metastasis of HNSCC tumors. The expression of TYK2 was significantly upregulated in HNSCC and was found to be closely correlated with HPV status, gender, clinical grade, and TP53 mutation status. Survival analysis suggested that TYK2 is associated with better survival outcomes and acts as an independent prognostic indicator of HNSCC. The model constructed herein also performed well in terms of predicting patient prognosis. The expression of TYK2 was positively associated with the population of tumor-infiltrating immune cells, expression of immune checkpoint genes, and antitumor drug susceptibility. Functionally, TYK2 knockdown significantly promoted the proliferation, migration, and invasion of HNSCC cell lines in vitro. The findings demonstrated that TYK2 could serve as a suppressor of tumor growth and holds significant promise as a novel biomarker for assessing the prognosis of patients with HNSCC and aid in immunotherapy against HNSCC.

Published
2022
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19. Using the Unified Theory of Acceptance and Use of Technology (UTAUT) and e-health literacy(e-HL) to Investigate the Tobacco Control Intentions and Behaviors of Non- Smoking College Students in China: A Cross-Sectional Investigation

Author

Ma, Yuanyuan, primary, Zhou, Mengxia, additional, Yu, Wenli, additional, Zou, Ziyue, additional, Ge, Pu, additional, Ma, Zheng Feei, additional, Tong, Yuting, additional, Li, Wei, additional, Li, Qiyu, additional, Li, Yunshan, additional, Zhu, Siya, additional, Sun, Xinying, additional, and Wu, Yibo, additional

Published
2022
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22. The Functional Mechanism of MicroRNA in Oral Lichen Planus

Author

Li,Yunshan, He,Yaodong, Xiang,Junwei, Feng,Linfei, Wang,Yuanyin, and Chen,Ran

Subjects
Journal of Inflammation Research
Abstract

Yunshan Li,1,* Yaodong He,1,* Junwei Xiang,1 Linfei Feng,2 Yuanyin Wang,1 Ran Chen1 1College & Hospital of Stomatology, Anhui Medical University, Key Laboratory of Oral Diseases Research of Anhui Province, Hefei, 230032, People’s Republic of China; 2Department of Oral and Maxillofacial Surgery, the First Affiliated Hospital of Anhui Medical University, Hefei, People’s Republic of China*These authors contributed equally to this workCorrespondence: Yuanyin Wang; Ran Chen, College & Hospital of Stomatology, Anhui Medical University, Key Laboratory of Oral Diseases Research of Anhui Province, Hefei, 230032, People’s Republic of China, Email wyy1970548@sohu.com; ahmuchenran@163.comAbstract: Non-coding RNAs (ncRNAs) are transcribed from the genomes of mammals and other complex organisms, and many of them are alternately spliced and processed into smaller products. Types of ncRNAs include microRNAs (miRNAs), circular RNAs, and long ncRNAs. miRNAs are about 21 nucleotides long and form a broad class of post-transcriptional regulators of gene expression that affect numerous developmental and physiological processes in eukaryotes. They usually act as negative regulators of mRNA expression through complementary binding sequences in the 3’-UTR of the target mRNA, leading to translation inhibition and target degradation. In recent years, the importance of ncRNA in oral lichen planus (OLP), particularly miRNA, has attracted extensive attention. However, the biological functions of miRNAs and their mechanisms in OLP are still unclear. In this review, we discuss the role and function of miRNAs in OLP, and we also describe their potential functional roles as biomarkers for the diagnosis of OLP. MiRNAs are promising new therapeutic targets, but more work is needed to understand their biological functions.Keywords: oral lichen planus, miRNA, biomarker, therapy

Published
2022

23. A hypoxia‐related lncRNA model for prediction of head and neck squamous cell carcinoma prognosis.

Author

Xiang, Junwei, He, Yaodong, Li, Yunshan, Wu, Kexuan, Cheng, Mengxiang, Wang, Yuanyin, and Chen, Ran

Subjects
HEAD & neck cancer, SQUAMOUS cell carcinoma, LINCRNA, IMMUNE checkpoint inhibitors, DISEASE risk factors, PREDICTION models
Abstract

Background: Head and neck squamous cell carcinoma (HNSCC) is one of the most common and highly heterogeneous malignancies worldwide. Increasing studies have proven that hypoxia and related long non‐coding RNA (lncRNA) are involved in the occurrence and prognosis of HNSCC. The goal of this work is to construct a risk assessment model using hypoxia‐related lncRNAs (hrlncRNAs) for HNSCC prognosis prediction and personalized treatment. Methods: Transcriptome expression matrix, clinical follow‐up data, and somatic mutation data of HNSCC patients were obtained from The Cancer Genome Atlas (TCGA). We used co‐expression analysis to identify hrlncRNAs, then screened for differentially expressed lncRNAs (DEhrlncRNAs), and paired these DEhrlncRNAs. The risk model was established through univariate, least absolute shrinkage and selection operator (LASSO), and stepwise multivariate Cox regression. Finally, we assessed the model from multiple perspectives of tumor mutation burden (TMB), tumor immune infiltration, chemotherapeutic sensitivity, immune checkpoint inhibitor (ICI), and functional enrichment. Results: The risk assessment model included 14 hrlncRNA pairs. The risk score was observed to be a reliable prognostic factor. The high‐risk patients had an unfavorable prognosis and significant differences from the low‐risk group in TMB and tumor immune infiltration. In the high‐risk patients, the common immune checkpoints were down‐regulated, including CTLA4 and PDCD1, and the sensibility to paclitaxel and docetaxel was higher. The functional enrichment analysis suggested that the low‐risk group was accompanied by activated immune function. Conclusions: The risk assessment model of 14‐hrlncRNA‐pairs demonstrated a promising prognostic prediction for HNSCC patients and can guide personalized clinical treatment. [ABSTRACT FROM AUTHOR]

Published
2023
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31. First observation of the Cabibbo-suppressed decays Ξc+→Σ+π−π+ and Ξc+→Σ−π+π+ and measurement of their branching ratios

Author

Vázquez-Jáuregui, E., Engelfried, J., Akgun, U., Alkhazov, G., Amaro-Reyes, J., Atamantchouk, A.G., Ayan, A.S., Balatz, M.Y., Blanco-Covarrubias, A., Bondar, N.F., Cooper, P.S., Dauwe, L.J., Davidenko, G.V., Dersch, U., Dolgolenko, A.G., Dzyubenko, G.B., Edelstein, R., Emediato, L., Endler, A.M.F., Eschrich, I., Escobar, C.O., Estrada, N., Evdokimov, A.V., Filimonov, I.S., Garcia, F.G., Gaspero, M., Giller, I., Golovtsov, V.L., Gouffon, P., Gülmez, E., He, Kangling, Iori, M., Jun, S.Y., Kaya, M., Kilmer, J., Kim, V.T., Kochenda, L.M., Konorov, I., Kozhevnikov, A.P., Krivshich, A.G., Krü, H., Kubantsev, M.A., Kubarovsky, V.P., Kulyavtsev, A.I., Kuropatkin, N.P., Kurshetsov, V.F., Kushnirenko, A., Kwan, S., Lach, J., Lamberto, A., Landsberg, L.G., Larin, I., Leikin, E.M., Li, Yunshan, Ló, G., Luksys, M., Lungov, T., Maleev, V.P., Mao, D., Mao, Chensheng, Mao, Zhenlin, Mathew, P., Mattson, M., Matveev, V., McCliment, E., Moinester, M.A., Molchanov, V.V., Morelos, A., Nelson, K.D., Nemitkin, A.V., Neoustroev, P.V., Newsom, C., Nilov, A.P., Nurushev, S.B., Ocherashvili, A., Onel, Y., Ozel, E., Ozkorucuklu, S., Penzo, A., Petrenko, S.V., Pogodin, P., Procario, M., Prutskoi, V.A., Ramberg, E., Rappazzo, G.F., Razmyslovich, B.V., Rud, V.I., Russ, J., Sánchez-López, J.L., Schiavon, P., Simon, J., Sitnikov, A.I., Skow, D., Smith, V.J., Srivastava, M., Steiner, V., Stepanov, V., Stutte, L., Svoiski, M., Terentyev, N.K., Thomas, G.P., Torres, I., Uvarov, L.N., Vasiliev, A.N., Vavilov, D.V., Verebryusov, V.S., Victorov, V.A., Vishnyakov, V.E., Vorobyov, A.A., Vorwalter, K., You, J., Zhao, Wenheng, Zheng, Shuchen, and Zukanovich-Funchal, R.

Subjects
Nuclear and High Energy Physics
Published
2008
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32. Confirmation of the doubly charmed baryon Ξcc+(3520) via its decay to pD+K−

Author

J. Amaro-Reyes, P. Mathew, G.V. Davidenko, Ugur Akgun, I. Eschrich, Andrey Vasiliev, V. I. Rud, M. Iori, I. Giller, A. I. Kulyavtsev, P. Gouffon, C.O. Escobar, E. J. Ramberg, L. Stutte, V. E. Vishnyakov, Vincent J Smith, A.G. Dolgolenko, A. M. F. Endler, Mao Zhenlin, P. Schiavon, J. M. You, M. Procario, J. Lach, A. A. Vorobyov, V. F. Kurshetsov, Ahmet S. Ayan, R. M. Edelstein, S. V. Petrenko, A. P. Nilov, I.S. Filimonov, P. S. Cooper, A. G. Krivshich, Suat Ozkorucuklu, C. R. Newsom, A.V. Nemitkin, F. G. Garcia, S. B. Nurushev, D. Skow, P. V. Neoustroev, M. Srivastava, A. V. Evdokimov, Viktor Matveev, A. P. Kozhevnikov, D. V. Vavilov, G. F. Rappazzo, E. Ozel, E. Vázquez-Jáuregui, Li Yunshan, Lev Uvarov, James Russ, A. Ocherashvili, Zhao Wenheng, Zheng Shuchen, S. Y. Jun, B. V. Razmyslovich, Erhan Gülmez, A.G. Atamantchouk, V. S. Verebryusov, L. J. Dauwe, I. Konorov, V. Stepanov, Victor Kim, U. Dersch, A. Lamberto, G. Alkhazov, M. A. Kubantsev, Nikolay Terentyev, M. Mattson, V. P. Kubarovsky, A. I. Sitnikov, Aldo Penzo, Yasar Onel, He Kangling, M. Gaspero, I. Larin, K. D. Nelson, K. Vorwalter, Mithat Kaya, E. McCliment, I. Torres, J. Simon, A. Morelos, P. Pogodin, L. M. Kochenda, Mao Chensheng, J. Kilmer, R. Zukanovich-Funchal, E. M. Leikin, D. Mao, V. Steiner, Simon Kwan, M.Y. Balatz, V. P. Maleev, Victor Golovtsov, A. Kushnirenko, N. P. Kuropatkin, V. V. Molchanov, M. Luksys, L.G. Landsberg, G. B. Dzyubenko, V. A. Prutskoi, H. Krüger, Jürgen Engelfried, M. Svoiski, V. A. Victorov, T. Lungov, Murray Moinester, Nikolay Bondar, G. P. Thomas, and L. Emediato

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Gaussian, State (functional analysis), Poisson distribution, 01 natural sciences, Nuclear physics, Charmed baryons, Baryon, symbols.namesake, 0103 physical sciences, symbols, Fermilab, Charm (quantum number), 010306 general physics
Abstract

We observe a signal for the doubly charmed baryon Ξ c c + in the decay mode Ξ c c + → p D + K − to complement the previous reported decay Ξ c c + → Λ c + K − π + in data from SELEX, the charm hadroproduction experiment at Fermilab. In this new decay mode we observe an excess of 5.62 events over a combinatoric background estimated by event mixing to be 1.38 ± 0.13 events. The mixed background has Gaussian statistics, giving a signal significance of 4.8σ. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4 × 10 −4 . The observed mass of this state is 3518 ± 3 MeV / c 2 , consistent with the published result. Averaging the two results gives a mass of 3518.7 ± 1.7 MeV / c 2 . The observation of this new weak decay mode confirms the previous SELEX suggestion that this state is a double charm baryon. The relative branching ratio for these two modes is 0.36 ± 0.21 .

Published
2005
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33. Hadronic production of Λ from 600 GeV/c π−, Σ− and p beams

Author

Garcia, F.G., Alkhazov, G., Atamantchouk, A.G., Balatz, M.Y., Bondar, N.F., Cooper, P.S., Dauwe, L.J., Davidenko, G.V., Dersch, U., Dolgolenko, A.G., Dzyubenko, G.B., Edelstein, R., Emediato, L., Endler, A.M.F., Engelfried, J., Eschrich, I., Escobar, C.O., Evdokimov, A.V., Filimonov, I.S., Gaspero, M., Giller, I., Golovtsov, V.L., Gouffon, P., Gülmez, E., He, Kangling, Iori, M., Jun, S.Y., Kaya, M., Kilmer, J., Kim, V.T., Kochenda, L.M., Konorov, I., Kozhevnikov, A.P., Krivshich, A.G., Krüger, H., Kubantsev, M.A., Kubarovsky, V.P., Kulyavtsev, A.I., Kuropatkin, N.P., Kurshetsov, V.F., Kushnirenko, A., Kwan, S., Lach, J., Lamberto, A., Landsberg, L.G., Larin, I., Leikin, E.M., Li, Yunshan, Luksys, M., Lungov, T., Maleev, V.P., Mao, D., Mao, Chensheng, Mao, Zhenlin, Mathew, P., Mattson, M., Matveev, V., McCliment, E., Moinester, M.A., Molchanov, V.V., Morelos, A., Nelson, K.D., Nemitkin, A.V., Neoustroev, P.V., Newsom, C., Nilov, A.P., Nurushev, S.B., Ocherashvili, A., Onel, Y., Ozel, E., Ozkorucuklu, S., Penzo, A., Petrenko, S.V., Pogodin, P., Procario, M., Prutskoi, V.A., Ramberg, E., Rappazzo, G.F., Razmyslovich, B.V., Rud, V.I., Russ, J., Schiavon, P., Simon, J., Sitnikov, A.I., Skow, D., Smith, V.J., Srivastava, M., Steiner, V., Stepanov, V., Stutte, L., Svoiski, M., Terentyev, N.K., Thomas, G.P., Uvarov, L.N., Vasiliev, A.N., Vavilov, D.V., Verebryusov, V.S., Victorov, V.A., Vishnyakov, V.E., Vorobyov, A.A., Vorwalter, K., You, J., Zhao, Wenheng, Zheng, Shuchen, and Zukanovich-Funchal, R.

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Lambda, 01 natural sciences, Asymmetry, Nuclear physics, Baryon, Pion, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment, 010306 general physics, media_common
Abstract

We present data from Fermilab experiment E781 (SELEX) on the hadroproduction asymmetry for anti-Lambda_c compared to Lambda_c+ as a function of xF and pt2 distributions for Lambda_c+. These data were measured in the same apparatus using incident pi-, sigma- beams at 600 GeV/c and proton beam at 540 GeV/c. The asymmetry is studied as a function of xF. In the forward hemisphere with xF >= 0.2 both baryon beams exhibit very strong preference for producing charm baryons rather than charm antibaryons, while the pion beam asymmetry is much smaller. In this energy regime the results show that beam fragments play a major role in the kinematics of Lambda_c formation, as suggested by the leading quark picture.

Published
2002
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34. Precision Measurements of theΛc+andD0Lifetimes

Author

A. P. Nilov, Suat Ozkorucuklu, T. Lungov, S. Y. Jun, A. P. Kozhevnikov, M. Procario, J. Kilmer, R. Zukanovich-Funchal, M. Iori, E. M. Leikin, M. Srivastava, A. M. F. Endler, P. Pogodin, A. I. Kulyavtsev, Victor Kim, Murray Moinester, James Russ, V. E. Vishnyakov, He Kangling, L. Stutte, Mao Zhenlin, P. S. Cooper, M. A. Kubantsev, C. R. Newsom, Yasar Onel, V. A. Prutskoi, M. E. Mattson, A. Lamberto, G. F. Rappazzo, G. Alkhazov, Andrey Vasiliev, Nikolay Terentyev, P. Mathew, Lev Uvarov, I. Eschrich, P. V. Neoustroev, E. Ozel, K. Vorwalter, Victor Maleev, V. Steiner, Zhao Wenheng, Mao Chensheng, Zheng Shuchen, A. Kushnirenko, Aldo Penzo, D. Mao, A. Evdokimov, D. V. Vavilov, P. Gouffon, I. Giller, N. P. Kuropatkin, E. J. Ramberg, Jürgen Engelfried, V. P. Kubarovsky, Simon Kwan, G. B. Dzyubenko, M. Gaspero, A. Morelos, M.Y. Balatz, K. D. Nelson, A. I. Sitnikov, E. McCliment, A.V. Nemitkin, Victor Golovtsov, A. Ocherashvili, H. Krüger, A.G. Atamantchouk, S. B. Nurushev, U. Dersch, Nikolay Bondar, R. M. Edelstein, G. P. Thomas, V. I. Rud, L. M. Kochenda, L. Emediato, V. F. Kurshetsov, S. V. Petrenko, L. G. Landsberg, C. O. Escobar, Li Yunshan, D. Skow, J. Lach, A. A. Vorobyov, J. Simon, V. Stepanov, I.S. Filimonov, I. Larin, Erhan Gülmez, B. V. Razmyslovich, L. J. Dauwe, V. S. Verebryusov, V. Matveev, M. Svoiski, V. A. Victorov, F. G. Garcia, Vincent J Smith, A.G. Dolgolenko, J. M. You, G.V. Davidenko, I. Konorov, Mehmet Kaya, V. V. Molchanov, M. Luksys, P. Schiavon, and A. G. Krivshich

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Maximum likelihood, Monte Carlo method, General Physics and Astronomy, Elementary particle, Lambda, Lambda baryon, 01 natural sciences, 7. Clean energy, 3. Good health, 0103 physical sciences, Charm (quantum number), Fermilab, 010306 general physics
Abstract

We report new precision measurements of the lifetimes of the {Lambda}{sup +}{sub c} and D{sup 0} from SELEX, the charm hadroproduction experiment at Fermilab. Based upon 1630 {Lambda}{sup +}{sub c} and 10210 D{sup 0} decays we observe lifetimes of {tau}[{Lambda}{sup +}{sub c}]=198.1{+-} 7.0{+-}5.6 fs and {tau}[D{sup 0}]=407.9{+-}6.0{+-}4 .3 fs .

Published
2001
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35. Total cross section measurements with π− , Σ− and protons on nuclei and nucleons around

Author

U. Dersch, N. Akchurin, V.A. Andreev, A.G. Atamantchouk, M. Aykac, M.Y. Balatz, N.F. Bondar, A. Bravar, P.S. Cooper, L.J. Dauwe, G.V. Davidenko, G. Dirkes, A.G. Dolgolenko, D. Dreossi, G.B. Dzyubenko, R. Edelstein, L. Emediato, A.M.F. Endler, J. Engelfried, I. Eschrich, C.O. Escobar, A.V. Evdokimov, I.S. Filimonov, F.G. Garcia, M. Gaspero, S. Gerzon, I. Giller, V.L. Golovtsov, Y.M. Goncharenko, E. Gottschalk, P. Gouffon, O.A. Grachov, E. Gülmez, He Kangling, M. Iori, S.Y. Jun, A.D. Kamenskii, M. Kaya, J. Kilmer, V.T. Kim, L.M. Kochenda, K. Königsmann, I. Konorov, A.P. Kozhevnikov, A.G. Krivshich, H. Krüger, M.A. Kubantsev, V.P. Kubarovsky, A.I. Kulyavtsev, N.P. Kuropatkin, V.F. Kurshetsov, A. Kushnirenko, S. Kwan, J. Lach, A. Lamberto, L.G. Landsberg, I. Larin, E.M. Leikin, Li Yunshan, Li Zhigang, M. Luksys, T. Lungov, D. Magarrel, V.P. Maleev, D. Mao, Mao Chensheng, Mao Zhenlin, S. Masciocchi, P. Mathew, M. Mattson, V. Matveev, E. McCliment, S.L. McKenna, M.A. Moinester, V.V. Molchanov, A. Morelos, V.A. Mukhin, K.D. Nelson, A.V. Nemitkin, P.V. Neoustroev, C. Newsom, A.P. Nilov, S.B. Nurushev, A. Ocherashvili, G. Oleynik, Y. Onel, E. Ozel, S. Ozkorucuklu, S. Patrichev, A. Penzo, S.I. Petrenko, P. Pogodin, B. Povh, M. Procario, V.A. Prutskoi, E. Ramberg, G.F. Rapazzo, B.V. Razmyslovich, V.I. Rud, J. Russ, Y. Scheglov, P. Schiavon, V.K. Semyatchkin, J. Simon, A.I. Sitnikov, D. Skow, V.J. Smith, M. Srivastava, V. Steiner, V. Stepanov, L. Stutte, M. Svoiski, N.K. Terentyev, G.P. Thomas, L.N. Uvarov, A.N. Vasiliev, D.V. Vavilov, V.S. Verebryusov, V.A. Victorov, V.E. Vishnyakov, A.A. Vorobyov, K. Vorwalter, J. You, Zhao Wenheng, Zheng Shuchen, and R. Zukanovich-Funchal

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, chemistry.chemical_element, Sigma, 7. Clean energy, 01 natural sciences, Copper, respiratory tract diseases, Nuclear physics, Momentum, Cross section (physics), chemistry, 0103 physical sciences, High Energy Physics::Experiment, Fermilab, Beryllium, Nuclear Experiment, 010306 general physics, Nucleon, Carbon
Abstract

Total cross sections for Sigma- and pi- on beryllium, carbon, polyethylene and copper as well as total cross sections for protons on beryllium and carbon have been measured in a broad momentum range around 600GeV/c. These measurements were performed with a transmission technique adapted to the SELEX hyperon-beam experiment at Fermilab. We report on results obtained for hadron-nucleus cross sections and on results for sigma_tot(Sigma- N) and sigma_tot(pi- N), which were deduced from nuclear cross sections.

Published
2000
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37. ptandxFdependence of the polarization ofΣ+hyperons produced by 800 GeV/cprotons

Author

A. Morelos, I. F. Albuquerque, N. F. Bondar, R. Carrigan, D. Chen, P. S. Cooper, Dai Lisheng, A. S. Denisov, A. V. Dobrovolsky, T. Dubbs, A. M. F. Endler, C. O. Escobar, M. Foucher, V. L. Golovtsov, H. Gottschalk, P. Gouffon, V. T. Grachev, A. V. Khanzadeev, M. A. Kubantsev, N. P. Kuropatkin, J. Lach, null Lang Pengfei, V. N. Lebedenko, null Li Chengze, null Li Yunshan, M. Luksys, J. R. P. Mahon, E. McCliment, C. Newsom, M. C. Pommot Maia, V. M. Samsonov, V. A. Schegelsky, null Shi Huanzhang, V. J. Smith, Tang Fukun, N. K. Terentyev, S. Timm, I. I. Tkatch, L. N. Uvarov, A. A. Vorobyov, null Yan Jie, Zhao Wenheng, null Zheng Shuchen, and null Zhong Yuanyuan

Subjects
Physics, Nuclear physics, Hyperon, Sigma, Nuclear Experiment, Polarization (waves), Lambda
Abstract

We utilize the angle and momentum resolution of our apparatus to study the polarization of 375 GeV/c Sigma(+) hyperons produced by 800 GeV/c protons incident on a Cu target. By examining in detail two of our high statistics data samples, we find evidence for structure in the p(t) dependence of Sigma(+) polarization and are able to extract the x(F) dependence of the Sigma(+) polarization and compare it with x(F) behavior in the Lambda(0) and Xi(-) systems.

Published
1995
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38. Measurement of the branching ratio and asymmetry parameter for theΣ+→pγ radiative decay

Author

Lang Pengfei, N. P. Kuropatkin, V. T. Grachev, Vincent J Smith, Shi Huanzhang, M. C. Pommot Maia, I. I. Tkatch, N. F. Bondar, A. Morelos, A. V. Dobrovolsky, M. A. Kubantsev, M. Luksys, Yan Jie, V.A. Schegelsky, T. Dubbs, V. L. Golovtsov, Zhao Wenheng, Zheng Shuchen, Alexei Khanzadeev, I. F. Albuquerque, Li Chengze, An.A. Vorobyov, A. S. Denisov, P. Gouffon, Carlos Escobar, E. McCliment, J. R. P. Mahon, M. Foucher, L. N. Uvarov, Dai Lisheng, R.A. Carrigan, P. S. Cooper, Tang Fukun, A. M. F. Endler, C. R. Newsom, H. Gottschalk, Li Yunshan, D Chen, N. K. Terentyev, S. Timm, J. Lach, Zhong Yuanyuan, V. M. Samsonov, and J. Langland

Subjects
Nuclear physics, Physics, Particle physics, Branching fraction, media_common.quotation_subject, Hyperon, Radiative decay, Sigma, High Energy Physics::Experiment, Asymmetry, media_common
Abstract

We have measured the branching ratio for the hyperon radiative decay ${\mathrm{\ensuremath{\Sigma}}}^{+}$\ensuremath{\rightarrow}p\ensuremath{\gamma} using the Fermilab polarized charged hyperon beam. This measurement and our previously published result on the asymmetry parameter in the same decay are part of Fermilab experiment E761. We find B(${\mathrm{\ensuremath{\Sigma}}}^{+}$\ensuremath{\rightarrow}p\ensuremath{\gamma})/B(${\mathrm{\ensuremath{\Sigma}}}^{+}$\ensuremath{\rightarrow}p${\mathrm{\ensuremath{\pi}}}^{0}$) to be [2.32\ifmmode\pm\else\textpm\fi{}0.11(stat)\ifmmode\pm\else\textpm\fi{}0.10(syst)]\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}3}$ with a sample of 31 901 events. The higher statistics and careful attention to systematic uncertainties make these significant improvements over previous measurements. We describe how our measurements were performed and briefly review the theoretical implications of these results.

Published
1995
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39. Measurement of the branching ratio for theΞ−→Σ−γ radiative decay

Author

Yan Jie, Dai Lisheng, Shi Huanzhang, Lang Pengfei, D. Chen, M. C. Pommot Maia, A. V. Dobrovolsky, M. Luksys, J. R. P. Mahon, N. K. Terentyev, E. McCliment, Tang Fukun, A. M. F. Endler, H. Gottschalk, A. V. Khanzadeev, N. F. Bondar, V.A. Schegelsky, A. A. Vorobyov, Zhong Yuanyuan, P. S. Cooper, M. A. Kubantsev, M. Foucher, A. Morelos, J. Lach, P. Gouffon, A. S. Denisov, C. R. Newsom, I. F. Albuquerque, S. Timm, L. N. Uvarov, Zhao Wenheng, Li Yunshan, Zheng Shuchen, N. P. Kuropatkin, V. T. Grachev, Li Chengze, I. I. Tkatch, T. Dubbs, Carlos Escobar, R. Carrigan, Vincent J Smith, V. L. Golovtsov, and V. M. Samsonov

Subjects
Physics, Baryon, Particle physics, Particle decay, Branching fraction, Hadron, Hyperon, General Physics and Astronomy, Lambda, Xi baryon, Sigma baryon
Abstract

We have measured the branching ratio for the hyperon radiative decay [Xi][sup [minus]][r arrow][Sigma][sup [minus]][gamma] from a sample of 211[plus minus]33 events obtained in the polarized 375 GeV/[ital c] charged hyperon beam at Fermilab. We find [ital B]([Xi][sup [minus]][r arrow][Sigma][sup [minus]][gamma]/[Xi][sup [minus]][r arrow][Lambda][sup 0][pi][sup [minus]])=(1.22[plus minus]0.23[plus minus]0.06)[times]10[sup [minus]4] where the quoted errors are statistical and systematic, respectively. We have also obtained an indication that the sign of the asymmetry parameter of this decay is positive.

Published
1994
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40. Measurement of the magnetic moments of theΣ+and Σ¯−hyperons

Author

N. P. Kuropatkin, V. T. Grachev, P. Gouffon, I. F. Albuquerque, M. Foucher, Lang Pengfei, Carlos Escobar, Tkatch, V. M. Samsonov, L. N. Uvarov, A. V. Dobrovolsky, Dai Lisheng, Li Chengze, Li Yunshan, E. McCliment, A. S. Denisov, M. Luksys, V.A. Schegelsky, N. K. Terentyev, P. S. Cooper, R.A. Carrigan, C. R. Newsom, S. Timm, A. Morelos, Zhong Yuanyuan, M. A. Kubantsev, N. F. Bondar, Shi Huanzhang, An.A. Vorobyov, T. Dubbs, J. Lach, Pommot Maia Mc, Tang Fukun, A. M. F. Endler, H. Gottschalk, Alexei Khanzadeev, D Chen, Zhao Wenheng, Zheng Shuchen, V. L. Golovtsov, Vincent J Smith, Yan Jie, and Mahon

Subjects
Baryon, Physics, Antiparticle, Proton, Magnetic moment, CPT symmetry, General Physics and Astronomy, Sigma, High Energy Physics::Experiment, Fermion, Statistical physics, Atomic physics, Sigma baryon
Abstract

We have measured the magnetic moments of the SIGMA+ and SIGMABAR- hyperons produced by 800-GeV protons incident on a Cu target. We determine the SIGMA+ magnetic moment to be (2.4613 +/- 0.0034 +/- 0.0040)mu(N) where the uncertainties are statistical and systematic, respectively. In this first measurement we determine the magnetic moment of the SIGMABAR- to be -(2.428 +/- 0.036 +/- 0.007)mu(N). The magnetic moments of the SIGMA+ and SIGMABAR- are consistent with each other in magnitude but opposite in sign as required by CPT invariance.

Published
1993
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41. Polarization ofΣ+and Σ¯−hyperons produced by 800-GeV/cprotons

Author

P. Gouffon, M. Foucher, M. Luksys, V.A. Schegelsky, A. V. Dobrovolsky, Li Yunshan, Zhao Wenheng, Zheng Shuchen, I. I. Tkatch, Lang Pengfei, Yan Jie, Vincent J Smith, J. Lach, N. P. Kuropatkin, V. T. Grachev, J. R. P. Mahon, Tang Fukun, A. M. F. Endler, Dai Lisheng, H. Gottschalk, Shi Huanzhang, A. A. Vorobyov, N. K. Terentyev, A. V. Khanzadeev, M. A. Kubantsev, A. S. Denisov, V. M. Samsonov, E. McCliment, A. Morelos, S. Timm, R.A. Carrigan, Zhong Yuanyuan, D Chen, T. Dubbs, V. L. Golovtsov, I. F. Albuquerque, Li Chengze, L. N. Uvarov, M. C. Pommot Maia, N. F. Bondar, Carlos Escobar, P. S. Cooper, and C. R. Newsom

Subjects
Physics, Hyperon, General Physics and Astronomy, Sigma, High Energy Physics::Experiment, Elementary particle, Atomic physics, Nuclear Experiment, Polarization (waves), Sigma baryon
Abstract

We have measured the polarization of 375-GeV/c SIGMA+ and SIGMABAR- hyperons produced by 800-GeV/c protons incident on a Cu target. We find that the SIGMA+ polarization rises with increasing p(t) to a maximum of 16% at p(t) = 1.0 GeV/c and then decreases to 10% at p(t) = 1.8 GeV/c. We compare this SIGMA+ polarization with data at lower energies. The SIGMABAR- polarization has been measured for the first time. It has the same sign as the SIGMA+ but smaller magnitude in a similar kinematical region.

Published
1993
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42. Measurement of the asymmetry parameter in the hyperon radiative decayΣ+→pγ

Author

A. V. Dobrovolsky, A. Morelos, Lang Pengfei, Tang Fukun, A. M. F. Endler, A. A. Vorobyov, H. Gottschalk, M. A. Kubantsev, Pommot Maia Mc, Lebedenko Vn, Goritchev Pa, Zhao Wenheng, Zheng Shuchen, I. F. Albuquerque, A. S. Denisov, E. McCliment, Li Yunshan, T. Dubbs, Carlos Escobar, N. K. Terentyev, R.A. Carrigan, L. N. Uvarov, M. Foucher, M. Luksys, Li Chengze, S. Timm, Tkatch, V. M. Samsonov, A. V. Khanzadeev, Kuropatkin Np, P. Gouffon, V. L. Golovtsov, J. Lach, N. F. Bondar, Zhong Yuanyuan, Mahon, V. T. Grachev, Shi Huanzhang, Vincent J Smith, D. Chen, Yan Jie, Dai Lisheng, P. S. Cooper, and C. R. Newsom

Subjects
Physics, Nuclear physics, Baryon, Particle physics, Particle decay, Hadron, Hyperon, General Physics and Astronomy, High Energy Physics::Experiment, Elementary particle, Fermion, Charged particle, Sigma baryon
Abstract

We have measured the asymmetry parameter (${\mathrm{\ensuremath{\alpha}}}_{\ensuremath{\gamma}}$) in the hyperon radiative decay ${\mathrm{\ensuremath{\Sigma}}}^{+}$\ensuremath{\rightarrow}p\ensuremath{\gamma} with a sample of 34 754\ifmmode\pm\else\textpm\fi{}212 events obtained in a polarized charged hyperon beam experiment at Fermilab. We find ${\mathrm{\ensuremath{\alpha}}}_{\ensuremath{\gamma}}$=-0.720\ifmmode\pm\else\textpm\fi{}0.086\ifmmode\pm\else\textpm\fi{}0.045, where the quoted errors are statistical and systematic, respectively.

Published
1992
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43. Observation of a Narrow Charm-Strange MesonDsJ+(2632)→Ds+ηandD0K+

Author

M. Iori, G. B. Dzyubenko, I. Konorov, P. Pogodin, M. Svoiski, V. A. Victorov, Murray Moinester, Jürgen Engelfried, V. V. Molchanov, T. Lungov, S. Y. Jun, M. Luksys, C. O. Escobar, Simon Kwan, L.G. Landsberg, J. Lach, A. A. Vorobyov, A. I. Sitnikov, A. P. Nilov, H. Krüger, M.Y. Balatz, I. Larin, F. G. Garcia, U. Dersch, J. Kilmer, G.V. Davidenko, A. V. Evdokimov, Viktor Matveev, I.S. Filimonov, K. D. Nelson, P. S. Cooper, C. R. Newsom, Li Yunshan, A. I. Kulyavtsev, V. F. Kurshetsov, R. Zukanovich-Funchal, S. V. Petrenko, E. J. Ramberg, E. M. Leikin, M. E. Mattson, G. F. Rappazzo, Vincent J Smith, A.G. Dolgolenko, Mao Zhenlin, B. V. Razmyslovich, A. Lamberto, K. Vorwalter, V. E. Vishnyakov, E. Vázquez-Jáuregui, Lev Uvarov, J. Simon, L. J. Dauwe, J. M. You, Aldo Penzo, V. P. Maleev, Nikolay Terentyev, Yasar Onel, A.G. Atamantchouk, Mehmet Kaya, Victor Golovtsov, P. Schiavon, A. M. F. Endler, A. Ocherashvili, Suat Ozkorucuklu, M. Gaspero, D. Skow, A. Morelos, P. Gouffon, Nikolay Bondar, G. P. Thomas, Mao Chensheng, A. P. Kozhevnikov, E. McCliment, I. Torres, Ugur Akgun, Erhan Gülmez, A. G. Krivshich, L. Emediato, A.V. Nemitkin, D. Mao, He Kangling, Andrey Vasiliev, M. A. Kubantsev, V. I. Rud, D. V. Vavilov, L. M. Kochenda, V. S. Verebryusov, S. B. Nurushev, A. Kushnirenko, N. P. Kuropatkin, Victor Kim, G. Alkhazov, V. P. Kubarovsky, M. Procario, L. Stutte, M. Srivastava, James Russ, V. Stepanov, P. Mathew, I. Eschrich, V. Steiner, I. Giller, R. M. Edelstein, Ahmet S. Ayan, P. V. Neoustroev, E. Ozel, Zhao Wenheng, Zheng Shuchen, and J. Amaro-Reyes

Subjects
Physics, Particle physics, Meson, 010308 nuclear & particles physics, Branching fraction, General Physics and Astronomy, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Fermilab, Charm (quantum number), Nuclear Experiment, 010306 general physics
Abstract

We report the first observation of a charm-strange meson D(+)(sJ)(2632) at a mass of 2632.5+/-1.7 MeV/c(2) in data from SELEX, the charm hadro-production experiment E781 at Fermilab. This state is seen in two decay modes, D(+)(s)eta and D0K+. In the D(+)(s)eta decay mode we observe a peak with 101 events over a combinatoric background of 54.9 events at a mass of 2635.4+/-3.3 MeV/c(2). There is a corresponding peak of 21 events over a background of 6.9 at 2631.5+/-2.0 MeV/c(2) in the decay mode D0K+. The decay width of this state is

Published
2004
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44. Observation of a narrow charm-strange meson D-sJ(+)(2632)-> D-s(+)eta and (DK+)-K-0

Author

A V, Evdokimov, U, Akgun, G, Alkhazov, J, Amaro-Reyes, A G, Atamantchouk, A S, Ayan, M Y, Balatz, N F, Bondar, P S, Cooper, L J, Dauwe, G V, Davidenko, U, Dersch, A G, Dolgolenko, G B, Dzyubenko, R, Edelstein, L, Emediato, A M F, Endler, J, Engelfried, I, Eschrich, C O, Escobar, I S, Filimonov, F G, Garcia, M, Gaspero, I, Giller, V L, Golovtsov, P, Gouffon, E, Gülmez, He, Kangling, M, Iori, S Y, Jun, M, Kaya, J, Kilmer, V T, Kim, L M, Kochenda, I, Konorov, A P, Kozhevnikov, A G, Krivshich, H, Krüger, M A, Kubantsev, V P, Kubarovsky, A I, Kulyavtsev, N P, Kuropatkin, V F, Kurshetsov, A, Kushnirenko, S, Kwan, J, Lach, A, Lamberto, L G, Landsberg, I, Larin, E M, Leikin, Li, Yunshan, M, Luksys, T, Lungov, V P, Maleev, D, Mao, Mao, Chensheng, Mao, Zhenlin, P, Mathew, M, Mattson, V, Matveev, E, McCliment, M A, Moinester, V V, Molchanov, A, Morelos, K D, Nelson, A V, Nemitkin, P V, Neoustroev, C, Newsom, A P, Nilov, S B, Nurushev, A, Ocherashvili, Y, Onel, E, Ozel, S, Ozkorucuklu, A, Penzo, S V, Petrenko, P, Pogodin, M, Procario, E, Ramberg, G F, Rappazzo, B V, Razmyslovich, V I, Rud, J, Russ, P, Schiavon, J, Simon, A I, Sitnikov, D, Skow, V J, Smith, M, Srivastava, V, Steiner, V, Stepanov, L, Stutte, M, Svoiski, N K, Terentyev, G P, Thomas, I, Torres, L N, Uvarov, A N, Vasiliev, D V, Vavilov, E, Vázquez-Jáuregui, V S, Verebryusov, V A, Victorov, V E, Vishnyakov, A A, Vorobyov, K, Vorwalter, J, You, Zhao, Wenheng, Zheng, Shuchen, and R, Zukanovich-Funchal

Abstract

We report the first observation of a charm-strange meson D(+)(sJ)(2632) at a mass of 2632.5+/-1.7 MeV/c(2) in data from SELEX, the charm hadro-production experiment E781 at Fermilab. This state is seen in two decay modes, D(+)(s)eta and D0K+. In the D(+)(s)eta decay mode we observe a peak with 101 events over a combinatoric background of 54.9 events at a mass of 2635.4+/-3.3 MeV/c(2). There is a corresponding peak of 21 events over a background of 6.9 at 2631.5+/-2.0 MeV/c(2) in the decay mode D0K+. The decay width of this state is17 MeV/c(2) at 90% confidence level. The relative branching ratio Gamma(D0K+)/Gamma(D(+)(s)eta) is 0.14+/-0.06. The mechanism that keeps this state narrow is unclear. Its decay pattern is also unusual, being dominated by the D(+)(s)eta decay mode.

Published
2004

45. New upper limit for the branching ratio of theΩ−→Ξ−γ radiative decay

Author

T. Dubbs, Shi Huanzhang, D Chen, N. K. Terentyev, Tkatch, I. F. Albuquerque, E. McCliment, L. N. Uvarov, Lang Pengfei, P. Gouffon, R.A. Carrigan, Alexei Khanzadeev, J. Lach, A. S. Denisov, Zhao Wenheng, Tang Fukun, A. M. F. Endler, H. Gottschalk, Mcp Maia, Zheng Shuchen, M. Luksys, V.A. Schegelsky, A. V. Dobrovolsky, An.A. Vorobyov, Carlos Escobar, A. Morelos, N. F. Bondar, Mahon, M. A. Kubantsev, Dai Lisheng, V. L. Golovtsov, V. M. Samsonov, Li Chengze, Li Yunshan, M. Foucher, Vincent J Smith, Yan Jie, P. S. Cooper, C. R. Newsom, N. P. Kuropatkin, V. T. Grachev, Zhong Yuanyuan, and S. Timm

Subjects
Physics, Particle physics, Proton, Branching fraction, Hyperon, Radiative decay, Omega, Nuclear physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Limit (mathematics), Fermilab, Nuclear Experiment, Beam (structure)
Abstract

We have searched for the rare hyperon radiative decay Omega- to Xi- gamma, using the Fermilab Proton Center 375 GeV/c charged hyperon beam. Our measurement of the Omega- beam fraction at 13.6 m from production is (4.8 +_ 0.4)10**(-5). No signal was found and we determine a new upper limit of (4.6 x 10**-4) at 90% CL for the Omega- to Xi- gamma branching ratio.

Published
1994
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46. First measurement ofπ−e→π−eγpion virtual compton scattering

Author

A. Ocherashvili, G. Alkhazov, A. G. Atamantchouk, M. Y. Balatz, N. F. Bondar, P. S. Cooper, L. J. Dauwe, G. V. Davidenko, U. Dersch, A. G. Dolgolenko, G. B. Dzyubenko, R. Edelstein, L. Emediato, A. M. F. Endler, J. Engelfried, I. Eschrich, C. O. Escobar, A. V. Evdokimov, I. S. Filimonov, F. G. Garcia, M. Gaspero, I. Giller, V. L. Golovtsov, P. Gouffon, E. Gülmez, He Kangling, M. Iori, S. Y. Jun, M. Kaya, J. Kilmer, V. T. Kim, L. M. Kochenda, I. Konorov, A. P. Kozhevnikov, A. G. Krivshich, H. Krüger, M. A. Kubantsev, V. P. Kubarovsky, A. I. Kulyavtsev, N. P. Kuropatkin, V. F. Kurshetsov, A. Kushnirenko, S. Kwan, J. Lach, A. Lamberto, L. G. Landsberg, I. Larin, E. M. Leikin, Li Yunshan, M. Luksys, T. Lungov, V. P. Maleev, D. Mao, Mao Chensheng, Mao Zhenlin, P. Mathew, M. Mattson, V. Matveev, E. McCliment, M. A. Moinester, V. V. Molchanov, A. Morelos, K. D. Nelson, A. V. Nemitkin, P. V. Neoustroev, C. Newsom, A. P. Nilov, S. B. Nurushev, Y. Onel, E. Ozel, S. Ozkorucuklu, A. Penzo, S. I. Petrenko, P. Pogodin, B. Pouh, M. Procario, V. A. Prutskoi, E. Ramberg, G. F. Rappazzo, B. V. Razmyslovich, V. I. Rud, J. Russ, P. Schiavon, J. Simon, A. I. Sitnikov, D. Skow, V. J. Smith, M. Srivastava, V. Steiner, V. Stepanov, L. Stutte, M. Svoiski, N. K. Terentyev, G. P. Thomas, L. N. Uvarov, A. N. Vasiliev, D. V. Vavilov, V. S. Verebryusov, V. A. Victorov, V. E. Vishnyakov, A. A. Vorobyov, K. Vorwalter, J. You, Zhao Wenheng, Zheng Shuchen, and R. Zukanovich-Funchal

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Chiral perturbation theory, 010308 nuclear & particles physics, Monte Carlo method, Compton scattering, Sigma, Electron, 01 natural sciences, Nuclear physics, Cross section (physics), Pion, 0103 physical sciences, High Energy Physics::Experiment, Fermilab, 010306 general physics
Abstract

Pion virtual compton scattering (VCS) via the reaction pi(-)e-->pi(-)egamma was observed in the Fermilab E781 SELEX experiment. SELEX used a 600 GeV/c pi(-) beam incident on target atomic electrons, detecting the incident pi(-) and the final state pi(-), electron and gamma. Theoretical predictions based on chiral perturbation theory are incorporated into a Monte Carlo simulation of the experiment and are compared to the data. The number of reconstructed events (=9) and their distribution with respect to the kinematic variables (for the kinematic region studied) are in reasonable accord with the predictions. The corresponding pi(-) VCS experimental cross section is sigma=38.8+/-13 nb, in agreement with the theoretical expectation of sigma=34.7 nb.

Published
2002
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47. First Observation of the Doubly Charmed BaryonΞcc+

Author

Mithat Kaya, Nikolay Bondar, G. P. Thomas, E. McCliment, L. Emediato, U. Dersch, D. V. Vavilov, B. V. Razmyslovich, L. M. Kochenda, J. M. You, L. J. Dauwe, Murray Moinester, P. Mathew, M. Gaspero, I. Eschrich, J. Lach, A. A. Vorobyov, H. Krüger, I.S. Filimonov, A. Morelos, M. Luksys, L.G. Landsberg, V. Steiner, T. Lungov, S. Y. Jun, Victor Kim, Yasar Onel, V. E. Vishnyakov, Erhan Gülmez, V. S. Verebryusov, I. Giller, D. Skow, He Kangling, Vincent J Smith, A.G. Dolgolenko, G. Alkhazov, Mao Zhenlin, K. Vorwalter, M. A. Kubantsev, V. P. Maleev, I. Konorov, Victor Golovtsov, A. Ocherashvili, V. I. Rud, M. Svoiski, V. A. Victorov, P. S. Cooper, C. R. Newsom, A. Lamberto, V. V. Molchanov, Nikolay Terentyev, V. A. Prutskoi, M. Mattson, R. M. Edelstein, A. V. Evdokimov, Viktor Matveev, V. P. Kubarovsky, G. F. Rappazzo, A. I. Kulyavtsev, F. G. Garcia, J. Kilmer, Li Yunshan, P. Gouffon, A. Kushnirenko, R. Zukanovich-Funchal, M. Procario, E. M. Leikin, Lev Uvarov, N. P. Kuropatkin, A.G. Atamantchouk, I. Larin, P. V. Neoustroev, E. Ozel, L. Stutte, Zhao Wenheng, Jürgen Engelfried, M. Srivastava, A. M. F. Endler, M. Iori, Zheng Shuchen, K. D. Nelson, P. Pogodin, James Russ, J. Simon, A. P. Kozhevnikov, V. Stepanov, A. I. Sitnikov, V. F. Kurshetsov, S. V. Petrenko, Aldo Penzo, Andrey Vasiliev, Suat Ozkorucuklu, A. P. Nilov, G.V. Davidenko, P. Schiavon, A. G. Krivshich, E. Oliveira, G. B. Dzyubenko, C. O. Escobar, E. J. Ramberg, A.V. Nemitkin, S. B. Nurushev, Mao Chensheng, D. Mao, Simon Kwan, and M.Y. Balatz

Subjects
Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hyperon, General Physics and Astronomy, Lambda baryon, 7. Clean energy, 01 natural sciences, Xi baryon, Charmed baryons, Baryon, Nuclear physics, Particle decay, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

We observe a signal for the doubly charmed baryon Xi(+)(cc) in the charged decay mode Xi(+)(cc)-->Lambda(+)(c)K-pi(+) in data from SELEX, the charm hadroproduction experiment at Fermilab. We observe an excess of 15.9 events over an expected background of 6.1+/-0.5 events, a statistical significance of 6.3sigma. The observed mass of this state is 3519+/-1 MeV/c(2). The Gaussian mass width of this state is 3 MeV/c(2), consistent with resolution; its lifetime is less than 33 fs at 90% confidence.

Published
2002
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48. First observation of the doubly charmed baryon Xi(+)(cc)

Author

M, Mattson, G, Alkhazov, A G, Atamantchouk, M Y, Balatz, N F, Bondar, P S, Cooper, L J, Dauwe, G V, Davidenko, U, Dersch, A G, Dolgolenko, G B, Dzyubenko, R, Edelstein, L, Emediato, A M F, Endler, J, Engelfried, I, Eschrich, C O, Escobar, A V, Evdokimov, I S, Filimonov, F G, Garcia, M, Gaspero, I, Giller, V L, Golovtsov, P, Gouffon, E, Gülmez, He, Kangling, M, Iori, S Y, Jun, M, Kaya, J, Kilmer, V T, Kim, L M, Kochenda, I, Konorov, A P, Kozhevnikov, A G, Krivshich, H, Krüger, M A, Kubantsev, V P, Kubarovsky, A I, Kulyavtsev, N P, Kuropatkin, V F, Kurshetsov, A, Kushnirenko, S, Kwan, J, Lach, A, Lamberto, L G, Landsberg, I, Larin, E M, Leikin, Li, Yunshan, M, Luksys, T, Lungov, V P, Maleev, D, Mao, Mao, Chensheng, Mao, Zhenlin, P, Mathew, V, Matveev, E, McCliment, M A, Moinester, V V, Molchanov, A, Morelos, K D, Nelson, A V, Nemitkin, P V, Neoustroev, C, Newsom, A P, Nilov, S B, Nurushev, A, Ocherashvili, E, Oliveira, Y, Onel, E, Ozel, S, Ozkorucuklu, A, Penzo, S V, Petrenko, P, Pogodin, M, Procario, V A, Prutskoi, E, Ramberg, G F, Rappazzo, B V, Razmyslovich, V I, Rud, J, Russ, P, Schiavon, J, Simon, A I, Sitnikov, D, Skow, V J, Smith, M, Srivastava, V, Steiner, V, Stepanov, L, Stutte, M, Svoiski, N K, Terentyev, G P, Thomas, L N, Uvarov, A N, Vasiliev, D V, Vavilov, V S, Verebryusov, V A, Victorov, V E, Vishnyakov, A A, Vorobyov, K, Vorwalter, J, You, Zhao, Wenheng, Zheng, Shuchen, and R, Zukanovich-Funchal

Abstract

We observe a signal for the doubly charmed baryon Xi(+)(cc) in the charged decay mode Xi(+)(cc)--Lambda(+)(c)K-pi(+) in data from SELEX, the charm hadroproduction experiment at Fermilab. We observe an excess of 15.9 events over an expected background of 6.1+/-0.5 events, a statistical significance of 6.3sigma. The observed mass of this state is 3519+/-1 MeV/c(2). The Gaussian mass width of this state is 3 MeV/c(2), consistent with resolution; its lifetime is less than 33 fs at 90% confidence.

Published
2002

49. Measurement of theΣ¯−lifetime and direct comparison with theΣ+lifetime

Author

Zhao Wenheng, Zheng Shuchen, J. Langland, D Chen, Alexei Khanzadeev, I. F. Albuquerque, P. S. Cooper, C. R. Newsom, L. N. Uvarov, A. V. Dobrovolsky, Li Yunshan, An.A. Vorobyov, Carlos Escobar, I. I. Tkatch, J. Lach, S. Timm, Li Chengze, Dai Lisheng, P. Gouffon, Zhong Yuanyuan, M. Luksys, R.F. Barbosa, V.A. Schegelsky, Vincent J Smith, Tang Fukun, A. M. F. Endler, A. S. Denisov, H. Gottschalk, M. Foucher, N. P. Kuropatkin, V. T. Grachev, J. R. P. Mahon, V. L. Golovtsov, T. Dubbs, Kubantsev, V. M. Samsonov, Yan Jie, E. McCliment, R.A. Carrigan, Shi Huanzhang, N. K. Terentyev, Lang Pengfei, A. Morelos, M. C. Pommot Maia, and N. F. Bondar

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Hyperon, Sigma
Published
1999
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