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First Measurement of Deeply Virtual Compton Scattering on the Neutron with Detection of the Active Neutron 首次测量中子的深虚康普顿散射并探测到活动中子
Pub Date : 2024-06-21 DOI: arxiv-2406.15539
A. Hobart, S. Niccolai, M. Čuić, K. Kumerički, P. Achenbach, J. S. Alvarado, W. R. Armstrong, H. Atac, H. Avakian, L. Baashen, N. A. Baltzell, L. Barion, M. Bashkanov, M. Battaglieri, B. Benkel, F. Benmokhtar, A. Bianconi, A. S. Biselli, S. Boiarinov, M. Bondi, W. A. Booth, F. Bossù, K. -Th. Brinkmann, W. J. Briscoe, W. K. Brooks, S. Bueltmann, V. D. Burkert, T. Cao, R. Capobianco, D. S. Carman, P. Chatagnon, G. Ciullo, P. L. Cole, M. Contalbrigo, A. D'Angelo, N. Dashyan, R. De Vita, M. Defurne, A. Deur, S. Diehl, C. Dilks, C. Djalali, R. Dupre, H. Egiyan, A. El Alaoui, L. El Fassi, L. Elouadrhiri, S. Fegan, A. Filippi, C. Fogler, K. Gates, G. Gavalian, G. P. Gilfoyle, D. Glazier, R. W. Gothe, Y. Gotra, M. Guidal, K. Hafidi, H. Hakobyan, M. Hattawy, F. Hauenstein, D. Heddle, M. Holtrop, Y. Ilieva, D. G. Ireland, E. L. Isupov, H. Jiang, H. S. Jo, K. Joo, T. Kageya, A. Kim, W. Kim, V. Klimenko, A. Kripko, V. Kubarovsky, S. E. Kuhn, L. Lanza, M. Leali, S. Lee, P. Lenisa, X. Li, I. J. D. MacGregor, D. Marchand, V. Mascagna, M. Maynes, B. McKinnon, Z. E. Meziani, S. Migliorati, R. G. Milner, T. Mineeva, M. Mirazita, V. Mokeev, C. Muñoz Camacho, P. Nadel-Turonski, P. Naidoo, K. Neupane, G. Niculescu, M. Osipenko, P. Pandey, M. Paolone, L. L. Pappalardo, R. Paremuzyan, E. Pasyuk, S. J. Paul, W. Phelps, N. Pilleux, M. Pokhrel, S. Polcher Rafael, J. Poudel, J. W. Price, Y. Prok, T. Reed, J. Richards, M. Ripani, J. Ritman, P. Rossi, A. A. Golubenko, C. Salgado, S. Schadmand, A. Schmidt, Marshall B. C. Scott, E. M. Seroka, Y. G. Sharabian, E. V. Shirokov, U. Shrestha, N. Sparveris, M. Spreafico, S. Stepanyan, I. I. Strakovsky, S. Strauch, J. A. Tan, N. Trotta, R. Tyson, M. Ungaro, S. Vallarino, L. Venturelli, V. Tommaso, H. Voskanyan, E. Voutier, D. P Watts, X. Wei, R. Williams, M. H. Wood, L. Xu, N. Zachariou, J. Zhang, Z. W. Zhao, M. Zurek
Measuring Deeply Virtual Compton Scattering on the neutron is one of thenecessary steps to understand the structure of the nucleon in terms ofGeneralized Parton Distributions (GPDs). Neutron targets play a complementaryrole to transversely polarized proton targets in the determination of the GPD$E$. This poorly known and poorly constrained GPD is essential to obtain thecontribution of the quarks' angular momentum to the spin of the nucleon. DVCSon the neutron was measured for the first time selecting the exclusive finalstate by detecting the neutron, using the Jefferson Lab longitudinallypolarized electron beam, with energies up to 10.6 GeV, and the CLAS12 detector.The extracted beam-spin asymmetries, combined with DVCS observables measured onthe proton, allow a clean quark-flavor separation of the imaginary parts of theGPDs $H$ and $E$.
测量中子的深虚康普顿散射是根据广义粒子分布(GPD)了解核子结构的必要步骤之一。在确定 GPD$E$ 时,中子靶与横向极化质子靶起着互补作用。这种知之甚少和约束不足的 GPD 对于获得夸克角动量对核子自旋的贡献至关重要。通过使用杰斐逊实验室的纵向极化电子束(能量高达10.6 GeV)和CLAS12探测器对中子进行探测,首次选择了中子的排他性终态来测量中子的DVCS。
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引用次数: 0
Dihadron Azimuthal Correlations in Deep-Inelastic Scattering Off Nuclear Targets 核目标深弹道散射中的迪哈德龙方位相关性
Pub Date : 2024-06-20 DOI: arxiv-2406.14387
CLAS Collaboration
We measured the nuclear dependence of the di-pion azimuthal correlationfunction in deep-inelastic scattering (DIS) using the CEBAF Large AcceptanceSpectrometer (CLAS) and a 5 GeV electron beam. As the nuclear-target sizeincreases, transitioning from deuterium to carbon, iron, and lead, thecorrelation function broadens monotonically. Its shape exhibits a significantdependence on kinematics, including the transverse momentum of the pions andthe difference in their rapidity. None of the various Monte-Carlo eventgenerators we evaluated could fully replicate the observed correlationfunctions and nuclear effects throughout the entire phase space. As the firststudy of its kind in DIS experiments, this research provides an importantbaseline for enhancing our understanding of the interplay between the nuclearmedium and the hadronization process in hadron production.
我们利用CEBAF大型接受谱仪(CLAS)和5 GeV电子束测量了深弹性散射(DIS)中二离子方位相关函数的核依赖性。随着核-靶尺寸的增加,从氘过渡到碳、铁和铅,相关函数单调地拓宽。它的形状与运动学有很大关系,包括粒子的横向动量和它们的速度差异。我们评估过的各种蒙特卡洛事件发生器,没有一个能在整个相空间完全复制观测到的相关函数和核效应。作为在 DIS 实验中进行的首次同类研究,这项研究为加深我们对强子产生过程中核鎓与强子化过程之间相互作用的理解提供了一个重要的基线。
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引用次数: 0
Direct neutrino-mass measurement based on 259 days of KATRIN data 根据 259 天的 KATRIN 数据直接测量中微子质量
Pub Date : 2024-06-19 DOI: arxiv-2406.13516
M. Aker, D. Batzler, A. Beglarian, J. Behrens, J. Beisenkötter, M. Biassoni, B. Bieringer, Y. Biondi, F. Block, S. Bobien, M. Böttcher, B. Bornschein, L. Bornschein, T. S. Caldwell, M. Carminati, A. Chatrabhuti, S. Chilingaryan, B. A. Daniel, K. Debowski, M. Descher, D. Díaz Barrero, P. J. Doe, O. Dragoun, G. Drexlin, F. Edzards, K. Eitel, E. Ellinger, R. Engel, S. Enomoto, A. Felden, C. Fengler, C. Fiorini, J. A. Formaggio, C. Forstner, F. M. Fränkle, K. Gauda, A. S. Gavin, W. Gil, F. Glück, S. Grohmann, R. Grössle, R. Gumbsheimer, N. Gutknecht, V. Hannen, L. Hasselmann, N. Haußmann, K. Helbing, H. Henke, S. Heyns, S. Hickford, R. Hiller, D. Hillesheimer, D. Hinz, T. Höhn, A. Huber, A. Jansen, C. Karl, J. Kellerer, K. Khosonthongkee, M. Kleifges, M. Klein, J. Kohpeiß, C. Köhler, L. Köllenberger, A. Kopmann, N. Kovač, A. Kovalík, H. Krause, L. La Cascio, T. Lasserre, J. Lauer, T. Le, O. Lebeda, B. Lehnert, G. Li, A. Lokhov M. Machatschek, M. Mark, A. Marsteller, E. L. Martin, C. Melzer, S. Mertens, S. Mohanty, J. Mostafa, K. Müller, A. Nava, H. Neumann, S. Niemes, A. Onillon, D. S. Parno, M. Pavan, U. Pinsook, A. W. P. Poon, J. M. Lopez Poyato, S. Pozzi, F. Priester, J. Ráliš, S. Ramachandran, R. G. H. Robertson, C. Rodenbeck, M. Röllig, C. Röttele, M. Ryšavý, R. Sack, A. Saenz, R. Salomon, P. Schäfer, M. Schlösser, K. Schlösser, L. Schlüter, S. Schneidewind, U. Schnurr, M. Schrank, J. Schürmann, A. Schütz, A. Schwemmer, A. Schwenck, M. Šefčík, D. Siegmann, F. Simon, F. Spanier, D. Spreng, W. Sreethawong, M. Steidl, J. Štorek, X. Stribl, M. Sturm, N. Suwonjandee, N. Tan Jerome, H. H. Telle, L. A. Thorne, T. Thümmler, S. Tirolf, N. Titov, I. Tkachev, K. Urban, K. Valerius, D. Vénos, C. Weinheimer, S. Welte, J. Wendel, C. Wiesinger, J. F. Wilkerson, J. Wolf, S. Wüstling, J. Wydra, W. Xu, S. Zadorozhny, G. Zeller
The fact that neutrinos carry a non-vanishing rest mass is evidence ofphysics beyond the Standard Model of elementary particles. Their absolute massbears important relevance from particle physics to cosmology. In this work, wereport on the search for the effective electron antineutrino mass with theKATRIN experiment. KATRIN performs precision spectroscopy of the tritium$beta$-decay close to the kinematic endpoint. Based on the first fiveneutrino-mass measurement campaigns, we derive a best-fit value of $m_nu^{2} ={-0.14^{+0.13}_{-0.15}}~mathrm{eV^2}$, resulting in an upper limit of $m_nu <{0.45}~mathrm{eV}$ at 90 % confidence level. With six times the statistics ofprevious data sets, amounting to 36 million electrons collected in 259measurement days, a substantial reduction of the background level and improvedsystematic uncertainties, this result tightens KATRIN's previous bound by afactor of almost two.
中微子的静止质量不等这一事实,是基本粒子标准模型之外的物理学证据。从粒子物理学到宇宙学,它们的绝对质量都具有重要意义。在这项工作中,我们报告了利用 KATRIN 实验寻找电子反中微子有效质量的情况。KATRIN对接近运动终点的氚(beta)衰变进行了精确的光谱分析。在第一次中微子质量测量活动的基础上,我们得出了一个最佳拟合值:$m_nu^{2} ={-0.14^{+0.13}_{-0.15}}~mathrm{eV^2}$ ,结果在90%的置信度下,上限为$m_nu <{0.45}~mathrm{eV}$ 。由于统计量是以前数据集的六倍,即在259个测量日中收集了3,600万个电子,本底水平大大降低,系统不确定性也有所改善,这一结果将KATRIN以前的上限收紧了近两倍。
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引用次数: 0
Measurement of Spin-Density Matrix Elements in $Δ^{++}(1232)$ photoproduction 测量 $Δ^{++}(1232)$ 光生成中的自旋密度矩阵元素
Pub Date : 2024-06-18 DOI: arxiv-2406.12829
F. Afzal, C. S. Akondi, M. Albrecht, M. Amaryan, S. Arrigo, V. Arroyave, A. Asaturyan, A. Austregesilo, Z. Baldwin, F. Barbosa, J. Barlow, E. Barriga, R. Barsotti, D. Barton, V. Baturin, V. V. Berdnikov, T. Black, W. Boeglin, M. Boer, W. J. Briscoe, T. Britton, S. Cao, E. Chudakov, G. Chung, P. L. Cole, O. Cortes, V. Crede, M. M. Dalton, D. Darulis, A. Deur, S. Dobbs, A. Dolgolenko, M. Dugger, R. Dzhygadlo, D. Ebersole, M. Edo, H. Egiyan, T. Erbora, P. Eugenio, A. Fabrizi, C. Fanelli, S. Fang, J. Fitches, A. M. Foda, S. Furletov, L. Gan, H. Gao, A. Gardner, A. Gasparian, D. Glazier, C. Gleason, V. S. Goryachev, B. Grube, J. Guo, L. Guo, J. Hernandez, K. Hernandez, N. D. Hoffman, D. Hornidge, G. Hou, P. Hurck, A. Hurley, W. Imoehl, D. G. Ireland, M. M. Ito, I. Jaegle, N. S. Jarvis, T. Jeske, M. Jing, R. T. Jones, V. Kakoyan, G. Kalicy, V. Khachatryan, C. Kourkoumelis, A. LaDuke, I. Larin, D. Lawrence, D. I. Lersch, H. Li, B. Liu, K. Livingston, G. J. Lolos, L. Lorenti, V. Lyubovitskij, R. Ma, D. Mack, A. Mahmood, H. Marukyan, V. Matveev, M. McCaughan, M. McCracken, C. A. Meyer, R. Miskimen, R. E. Mitchell, K. Mizutani, V. Neelamana, L. Ng, E. Nissen, S. Orešić, A. I. Ostrovidov, Z. Papandreou, C. Paudel, R. Pedroni, L. Pentchev, K. J. Peters, E. Prather, S. Rakshit, J. Reinhold, A. Remington, B. G. Ritchie, J. Ritman, G. Rodriguez, D. Romanov, K. Saldana, C. Salgado, S. Schadmand, A. M. Schertz, K. Scheuer, A. Schick, A. Schmidt, R. A. Schumacher, J. Schwiening, N. Septian, P. Sharp, X. Shen, M. R. Shepherd, J. Sikes, A. Smith, E. S. Smith, D. I. Sober, A. Somov, S. Somov, J. R. Stevens, I. I. Strakovsky, B. Sumner, K. Suresh, V. V. Tarasov, S. Taylor, A. Teymurazyan, A. Thiel, T. Viducic, T. Whitlatch, N. Wickramaarachchi, Y. Wunderlich, B. Yu, J. Zarling, Z. Zhang, X. Zhou, B. Zihlmann
We report the measurement of spin-density matrix elements of the$Delta^{++}(1232)$ in the photoproduction reaction $gamma p topi^-Delta^{++}(1232)$ with the GlueX experiment in Hall D at Jefferson Lab.The measurement used a linearly polarized photon beam with$E_gamma=8.2-8.8$~GeV and the statistical precision exceeds the previousmeasurement from SLAC by three orders of magnitude for the momentum transfersquared region $-t < 1.4$ GeV$^2$. The data are sensitive to the previouslyundetermined relative sign between couplings in existing Regge exchange models.Linear combinations of the extracted SDMEs allow for a decomposition intonatural and unnatural exchange amplitudes, which shows that the unnaturalexchange plays an important role in the low $-t$ region.
我们报告了在杰斐逊实验室D大厅利用GlueX实验测量光生成反应$gamma p topi^-Delta^{++}(1232)$ 的$Delta^{++}(1232)$ 的自旋密度矩阵元素的结果。测量使用了线性偏振光子束,其E_gamma=8.2-8.8$~GeV,在动量转移平方区域$-t < 1.4$ GeV$^2$,统计精度比之前SLAC的测量超出了三个数量级。提取的SDMEs的线性组合可以分解为自然和非自然的交换振幅,这表明非自然交换在低t$区域起着重要作用。
{"title":"Measurement of Spin-Density Matrix Elements in $Δ^{++}(1232)$ photoproduction","authors":"F. Afzal, C. S. Akondi, M. Albrecht, M. Amaryan, S. Arrigo, V. Arroyave, A. Asaturyan, A. Austregesilo, Z. Baldwin, F. Barbosa, J. Barlow, E. Barriga, R. Barsotti, D. Barton, V. Baturin, V. V. Berdnikov, T. Black, W. Boeglin, M. Boer, W. J. Briscoe, T. Britton, S. Cao, E. Chudakov, G. Chung, P. L. Cole, O. Cortes, V. Crede, M. M. Dalton, D. Darulis, A. Deur, S. Dobbs, A. Dolgolenko, M. Dugger, R. Dzhygadlo, D. Ebersole, M. Edo, H. Egiyan, T. Erbora, P. Eugenio, A. Fabrizi, C. Fanelli, S. Fang, J. Fitches, A. M. Foda, S. Furletov, L. Gan, H. Gao, A. Gardner, A. Gasparian, D. Glazier, C. Gleason, V. S. Goryachev, B. Grube, J. Guo, L. Guo, J. Hernandez, K. Hernandez, N. D. Hoffman, D. Hornidge, G. Hou, P. Hurck, A. Hurley, W. Imoehl, D. G. Ireland, M. M. Ito, I. Jaegle, N. S. Jarvis, T. Jeske, M. Jing, R. T. Jones, V. Kakoyan, G. Kalicy, V. Khachatryan, C. Kourkoumelis, A. LaDuke, I. Larin, D. Lawrence, D. I. Lersch, H. Li, B. Liu, K. Livingston, G. J. Lolos, L. Lorenti, V. Lyubovitskij, R. Ma, D. Mack, A. Mahmood, H. Marukyan, V. Matveev, M. McCaughan, M. McCracken, C. A. Meyer, R. Miskimen, R. E. Mitchell, K. Mizutani, V. Neelamana, L. Ng, E. Nissen, S. Orešić, A. I. Ostrovidov, Z. Papandreou, C. Paudel, R. Pedroni, L. Pentchev, K. J. Peters, E. Prather, S. Rakshit, J. Reinhold, A. Remington, B. G. Ritchie, J. Ritman, G. Rodriguez, D. Romanov, K. Saldana, C. Salgado, S. Schadmand, A. M. Schertz, K. Scheuer, A. Schick, A. Schmidt, R. A. Schumacher, J. Schwiening, N. Septian, P. Sharp, X. Shen, M. R. Shepherd, J. Sikes, A. Smith, E. S. Smith, D. I. Sober, A. Somov, S. Somov, J. R. Stevens, I. I. Strakovsky, B. Sumner, K. Suresh, V. V. Tarasov, S. Taylor, A. Teymurazyan, A. Thiel, T. Viducic, T. Whitlatch, N. Wickramaarachchi, Y. Wunderlich, B. Yu, J. Zarling, Z. Zhang, X. Zhou, B. Zihlmann","doi":"arxiv-2406.12829","DOIUrl":"https://doi.org/arxiv-2406.12829","url":null,"abstract":"We report the measurement of spin-density matrix elements of the\u0000$Delta^{++}(1232)$ in the photoproduction reaction $gamma p to\u0000pi^-Delta^{++}(1232)$ with the GlueX experiment in Hall D at Jefferson Lab.\u0000The measurement used a linearly polarized photon beam with\u0000$E_gamma=8.2-8.8$~GeV and the statistical precision exceeds the previous\u0000measurement from SLAC by three orders of magnitude for the momentum transfer\u0000squared region $-t < 1.4$ GeV$^2$. The data are sensitive to the previously\u0000undetermined relative sign between couplings in existing Regge exchange models.\u0000Linear combinations of the extracted SDMEs allow for a decomposition into\u0000natural and unnatural exchange amplitudes, which shows that the unnatural\u0000exchange plays an important role in the low $-t$ region.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141521027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photoproduction of J/$ψ$ and dileptons in Pb-Pb collisions with nuclear overlap 核重叠 Pb-Pb 碰撞中 J/$ψ$ 和二重子的光生成
Pub Date : 2024-06-18 DOI: arxiv-2406.12630
Nicolas Bizéfor the ALICE collaboration
Photon-photon reactions and the production of J/$psi$ meson throughphotonuclear reactions have been extensively studied in ultra-peripheralheavy-ion collisions, in which the impact parameter is larger than twice thenuclear radius. In recent years, coherently photoproduced J/$psi$ and dileptonproduction via photon-photon interactions have also been observed innucleus-nucleus (A-A) collisions with nuclear overlap. The former can help toconstrain the nuclear gluon distributions at low Bjorken-$x$ and high energy,while the latter could be used to further map the electromagnetic fieldsproduced in heavy-ion collisions. In addition, these measurements can shedlight on the theory behind photon-induced reactions in A-A collisions withnuclear overlap, including possible interactions of the measured probes withthe formed and fast expanding quark-gluon plasma. Since the produced quarkoniumis expected to keep the polarization of the incoming photon due to $s$-channelhelicity conservation, the photoproduction origin of the J/$psi$ yield excessat very low transverse momentum, $p_{rm T}$, can be confirmed by themeasurement of the J/$psi$ polarization. The ALICE detector can performquarkonium production measurements at both mid ($|y|<0.9$) and forward($2.5
光子-光子反应和通过光子核反应产生J/$psi$介子已经在超外围重离子碰撞中得到了广泛的研究,在这种碰撞中,碰撞参数大于核半径的两倍。近年来,在核重叠的核-核(A-A)对撞中也观测到了通过光子相互作用相干产生的J/$psi$和二轻子。前者有助于在低Bjorken-$x$和高能量下约束核胶子分布,而后者可用于进一步绘制重离子碰撞中产生的电磁场。此外,这些测量还可以揭示核重叠的A-A对撞中光子诱导反应背后的理论,包括测量探针与已形成并快速膨胀的夸克-胶子等离子体之间可能存在的相互作用。由于s$沟道褶皱守恒,产生的夸克鎓预计会保持进入光子的偏振,因此可以通过测量J/$psi$的偏振来证实J/$psi$在很低的横动量($p_{rm T}$)下产生过量的光生源。ALICE探测器可以在中速($|y|<0.9$)和前速($2.5
{"title":"Photoproduction of J/$ψ$ and dileptons in Pb-Pb collisions with nuclear overlap","authors":"Nicolas Bizéfor the ALICE collaboration","doi":"arxiv-2406.12630","DOIUrl":"https://doi.org/arxiv-2406.12630","url":null,"abstract":"Photon-photon reactions and the production of J/$psi$ meson through\u0000photonuclear reactions have been extensively studied in ultra-peripheral\u0000heavy-ion collisions, in which the impact parameter is larger than twice the\u0000nuclear radius. In recent years, coherently photoproduced J/$psi$ and dilepton\u0000production via photon-photon interactions have also been observed in\u0000nucleus-nucleus (A-A) collisions with nuclear overlap. The former can help to\u0000constrain the nuclear gluon distributions at low Bjorken-$x$ and high energy,\u0000while the latter could be used to further map the electromagnetic fields\u0000produced in heavy-ion collisions. In addition, these measurements can shed\u0000light on the theory behind photon-induced reactions in A-A collisions with\u0000nuclear overlap, including possible interactions of the measured probes with\u0000the formed and fast expanding quark-gluon plasma. Since the produced quarkonium\u0000is expected to keep the polarization of the incoming photon due to $s$-channel\u0000helicity conservation, the photoproduction origin of the J/$psi$ yield excess\u0000at very low transverse momentum, $p_{rm T}$, can be confirmed by the\u0000measurement of the J/$psi$ polarization. The ALICE detector can perform\u0000quarkonium production measurements at both mid ($|y|<0.9$) and forward\u0000($2.5<y<4$) rapidities down to $p_{rm T} = 0$. In the following, the new ALICE\u0000measurements of the J/$psi$ $y$-differential cross section and the first\u0000polarization results of coherently photoproduced J/$psi$ via the dimuon decay\u0000channel at forward rapidity in Pb-Pb collisions at $sqrt{s_{NN}}=$ 5.02 TeV\u0000are reported. Additionally, the measurement of an excess with respect to\u0000expectations from hadronic production in the dielectron yield, at low mass and\u0000$p_{rm T}$, at midrapidity in Pb-Pb collisions at $sqrt{s_{NN}}=$ 5.02~TeV,\u0000is presented. The results are compared with available theoretical models.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141521029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Polarized internal target experiments based on EIC beams 基于 EIC 光束的偏振内靶实验
Pub Date : 2024-06-17 DOI: arxiv-2406.11480
B. Wojtsekhowski
The Electron-Ion Collider is under construction at BNL. It will havehigh-energy high-intensity polarized beams of electrons and hadrons. Thesebeams will allow a high accuracy investigation of nucleon structure in the low-to very-low-x DIS regime. At the same time, similar to the realization at HERA,these beams could be used with an internal target for a very productiveinvestigation of medium- to high-x nucleon structure. Due to a novel regime ofelectron beam operation and its high polarization and intensity, theFigure-of-Merit of an internal target experiment at EIC will be 500+ timeshigher than was obtained by HERMES.
电子-离子对撞机正在 BNL 建设中。它将拥有高能量、高强度的电子和中子偏振光束。这些光束将允许在低到极低的 x DIS 状态下对核子结构进行高精度研究。同时,与在 HERA 实现的情况类似,这些光束也可以与内部目标一起用于对中高倍核子结构进行富有成效的研究。由于电子束运行的新机制及其高偏振和高强度,EIC 内部靶实验的功绩值将比 HERMES 高 500 多倍。
{"title":"Polarized internal target experiments based on EIC beams","authors":"B. Wojtsekhowski","doi":"arxiv-2406.11480","DOIUrl":"https://doi.org/arxiv-2406.11480","url":null,"abstract":"The Electron-Ion Collider is under construction at BNL. It will have\u0000high-energy high-intensity polarized beams of electrons and hadrons. These\u0000beams will allow a high accuracy investigation of nucleon structure in the low-\u0000to very-low-x DIS regime. At the same time, similar to the realization at HERA,\u0000these beams could be used with an internal target for a very productive\u0000investigation of medium- to high-x nucleon structure. Due to a novel regime of\u0000electron beam operation and its high polarization and intensity, the\u0000Figure-of-Merit of an internal target experiment at EIC will be 500+ times\u0000higher than was obtained by HERMES.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Measurement of $J/ψ$ and $ψleft(2Sright)$ production in $p+p$ and $p+d$ interactions at 120 GeV 在120 GeV的$p+p$和$p+d$相互作用中测量$J/ψ$和$ψleft(2Sright)$的产生
Pub Date : 2024-06-17 DOI: arxiv-2406.11459
C. H. Leung, K. Nagai, K. Nakano, D. Nawarathne, J. Dove, S. Prasad, N. Wuerfel, C. A. Aidala, J. Arrington, C. Ayuso, C. L. Barker, C. N. Brown, W. C. Chang, A. Chen, D. C. Christian, B. P. Dannowitz, M. Daugherity, L. El Fassi, D. F. Geesaman, R. Gilman, Y. Goto, R. Guo, T. J. Hague, R. J. Holt, M. F. Hossain, D. Isenhower, E. Kinney, A. Klein, D. W. Kleinjan, Y. Kudo, P. -J. Lin, K. Liu, M. X. Liu, W. Lorenzon, R. E. McClellan, P. L. McGaughey, M. M. Medeiros, Y. Miyachi, S. Miyasaka, D. H. Morton, K. Nakahara, S. Nara, S. F. Pate, J. C. Peng, A. Pun, B. J. Ramson, P. E. Reimer, J. G. Rubin, F. Sanftl, S. Sawada, T. Sawada, M. B. C. Scott, T. -A. Shibata, A. S. Tadepalli, M. Teo, R. S. Towell, S. Uemura, S. G. Wang, A. B. Wickes, J. Wu, Z. H. Ye
We report the $p+p$ and $p+d$ differential cross sections measured in theSeaQuest experiment for $J/psi$ and $psileft(2Sright)$ production at 120GeV beam energy covering the forward $x$-Feynman ($x_F$) range of $0.5 < x_F<0.9$. The measured cross sections are in good agreement with theoreticalcalculations based on the nonrelativistic QCD (NRQCD) using the long-distancematrix elements deduced from a recent global analysis of proton- andpion-induced charmonium production data. The $sigma_{psileft(2Sright)} /sigma_{J/psi}$ cross section ratios are found to increase as $x_F$ increases,indicating that the $q bar{q}$ annihilation process has larger contributionsin the $psileft(2Sright)$ production than the $J/psi$ production. The$sigma_{pd}/2sigma_{pp}$ cross section ratios are observed to besignificantly different for the Drell-Yan process and $J/psi$ production,reflecting their different production mechanisms. We find that the$sigma_{pd}/2sigma_{pp}$ ratios for $J/psi$ production at the forward $x_F$region are sensitive to the $bar{d}/ bar{u}$ flavor asymmetry of the protonsea, analogous to the Drell-Yan process. The transverse momentum ($p_T$)distributions for $J/psi$ and $psileft(2Sright)$ production are alsopresented and compared with data collected at higher center-of-mass energies.
我们报告了在SeaQuest实验中测量到的$p+p$和$p+d$差分截面,这些截面是在120GeV束能下测量的$J/psi$和$psileft(2Sright)$产生,覆盖了0.5 < x_F<0.9$的正向$x$-费曼($x_F$)范围。测得的截面与基于非相对论QCD(NRQCD)的理论计算结果吻合得很好,后者使用的是最近对质子和子诱导的粲产生数据进行全局分析时推导出的长距离矩阵元素。发现随着x_F$的增加,$sigma_{psileft(2Sright)} /sigma_{J/psi}$截面比也会增加,这表明在$psileft(2Sright)$产生中,$q bar{q}$湮灭过程比$J/psi$产生有更大的贡献。在德雷尔-杨过程和$J/psi$产生中,观察到$sigma_{pd}/2sigma_{pp}$截面比明显不同,这反映了它们不同的产生机制。我们发现,在前向$x_F$区域,$J/psi$产生的$sigma_{pd}/2sigma_{pp}$比对质子海的$bar{d}/bar{u}$味道不对称性很敏感,这与德雷尔-扬过程类似。同时还给出了$J/psi$和$psileft(2Sright)$产生的横动量($p_T$)分布,并与在更高的质心能量下收集的数据进行了比较。
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引用次数: 0
Experimental studies of the three nucleon system dynamics in the proton induced deuteron breakup at 108 MeV 108 兆电子伏质子诱导氘核破裂中三个核子系统动力学的实验研究
Pub Date : 2024-06-14 DOI: arxiv-2407.01582
A. Łobejko, E. Stephan, I. Ciepał, J. Golak, N. Kalantar--Nayestanaki, S. Kistryn, B. Kłos, A. Kozela, P. Kulessa, W. Parol, R. Skibiński, I. Skwira-Chalot, A. Szadziński, A. Wilczek, H. Witała, B. Włoch, J. Zejma
The differential cross sections for the $^2$H(p,pp)n reaction have beenmeasured for 84 angular configurations of the outgoing protons in the range ofpolar angles from 13 to 33 degrees with a proton beam of 108 MeV. Data havebeen collected in the Cyclotron Center Bronowice (CCB) at the Institute ofNuclear Physics PAS in Cracow, using the BINA detector setup. Analysis leadingto determination of the breakup cross section values is described. Absolutenormalization is obtained by normalization to the simultaneously measured$^2$H(p,d)p scattering events.Experimental results are compared to thestate-of-the-art theoretical calculations. Global analysis shows significantinfluence of the Coulomb interaction and small effects of three nucleon forcein the studied phase space region.
用 108 兆电子伏的质子束测量了出射质子在 13 至 33 度极角范围内的 84 个角度构型的 $^2$H(p,pp)n 反应的微分截面。数据是在克拉科夫核物理研究所(Institute of Nuclear Physics PAS)的布罗诺维采回旋加速器中心(Cyclotron Center Bronowice,CCB)利用 BINA 探测器装置收集的。文中介绍了确定分裂截面值的分析方法。实验结果与最新理论计算结果进行了比较。全局分析表明,在所研究的相空间区域,库仑相互作用的影响很大,而三核力的影响很小。
{"title":"Experimental studies of the three nucleon system dynamics in the proton induced deuteron breakup at 108 MeV","authors":"A. Łobejko, E. Stephan, I. Ciepał, J. Golak, N. Kalantar--Nayestanaki, S. Kistryn, B. Kłos, A. Kozela, P. Kulessa, W. Parol, R. Skibiński, I. Skwira-Chalot, A. Szadziński, A. Wilczek, H. Witała, B. Włoch, J. Zejma","doi":"arxiv-2407.01582","DOIUrl":"https://doi.org/arxiv-2407.01582","url":null,"abstract":"The differential cross sections for the $^2$H(p,pp)n reaction have been\u0000measured for 84 angular configurations of the outgoing protons in the range of\u0000polar angles from 13 to 33 degrees with a proton beam of 108 MeV. Data have\u0000been collected in the Cyclotron Center Bronowice (CCB) at the Institute of\u0000Nuclear Physics PAS in Cracow, using the BINA detector setup. Analysis leading\u0000to determination of the breakup cross section values is described. Absolute\u0000normalization is obtained by normalization to the simultaneously measured\u0000$^2$H(p,d)p scattering events.Experimental results are compared to the\u0000state-of-the-art theoretical calculations. Global analysis shows significant\u0000influence of the Coulomb interaction and small effects of three nucleon force\u0000in the studied phase space region.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"abs/2107.10606 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141521032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An experimental search for an explanation of the difference between beam and bottle neutron lifetime measurements 通过实验寻找束中子寿命测量和瓶中子寿命测量之间差异的解释
Pub Date : 2024-06-14 DOI: arxiv-2406.10378
M. F. Blatnik, L. S. Blokland, N. Callahan, J. H. Choi, S. Clayton, C. B Cude-Woods, B. W. Filippone, W. R. Fox, E. Fries, P. Geltenbort, F. M. Gonzalez, L. Hayen, K. P. Hickerson, A. T. Holley, T. M. Ito, A. Komives, S Lin, Chen-Yu Liu, M. F. Makela, C. L. Morris, R. Musedinovic, C. M. O'Shaughnessy, R. W. Pattie Jr., J. C. Ramsey, D. J. Salvat, A. Saunders, S. J. Seestrom, E. I. Sharapov, M. Singh, Z. Tang, W. F. Uhrich, J. Vanderwerp, P. Walstrom, Z. Wang, A. R. Young
The past two decades have yielded several new measurements and reanalysis ofolder measurements of the neutron lifetime. These have led to a 4.4 standarddeviation discrepancy between the most precise measurements of the neutrondecay rate producing protons in cold neutron beams and the most preciselifetime measured in neutron storage experiments. Here we publish an analysisof the recently published UCN aimed a searching for an explanation of thisdifference using the model proposed by Koch and Hummel.
过去二十年来,对中子寿命进行了多次新的测量,并对较早的测量结果进行了重新分析。这导致冷中子束中产生质子的中子衰变率的最精确测量结果与中子贮存实验中测得的最精确寿命之间存在 4.4 个标准差的差异。在此,我们发表了对最近发表的 UCN 的分析,旨在利用 Koch 和 Hummel 提出的模型寻找对这一差异的解释。
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引用次数: 0
Final Search for Short-Baseline Neutrino Oscillations with the PROSPECT-I Detector at HFIR 利用高频红外探测器 PROSPECT-I 对短基线中微子振荡的最终搜索
Pub Date : 2024-06-14 DOI: arxiv-2406.10408
M. Andriamirado, B. Balantekin, C. D. Bass, O. Benevides Rodrigues, E. P. Bernard, N. S. Bowden, C. D. Bryan, R. Carr, T. Classen, A. J. Conant, G. Deichert, M. J. Dolinski, A. Erickson, A. Galindo-Uribarri, S. Gokhale, C. Grant, S. Hans, A. B. Hansell, K. M. Heeger, B. Heffron, D. E. Jaffe, S. Jayakumar, J. R. Koblanski, P. Kunkle, C. E. Lane, B. R. Littlejohn, A. Lozano Sanchez, X. Lu, F. Machado, J. Maricic, M. P. Mendenhall, A. M. Meyer, R. Milincic, P. E. Mueller, H. Mumm, R. Neilson, X. Qian, C. Roca, R. Rosero, P. Surukuchi, F. Sutanto, D. Venegas-Vargas, P. B. Weatherly, J. Wilhelmi, M. Yeh, C. Zhang, X. Zhang
The PROSPECT experiment is designed to perform precise searches forantineutrino disappearance at short distances (7 - 9~m) from compact nuclearreactor cores. This Letter reports results from a new neutrino oscillationanalysis performed using the complete data sample from the PROSPECT-I detectoroperated at the High Flux Isotope Reactor in 2018. The analysis uses amulti-period selection of inverse beta decay neutrino interactions with reducedbackgrounds and enhanced statistical power to set limits on electron-flavordisappearance caused by mixing with sterile neutrinos with 0.2 - 20 eV$^2$ masssplittings. Inverse beta decay positron energy spectra from six differentreactor-detector distance ranges are found to be statistically consistent withone another, as would be expected in the absence of sterile neutrinooscillations. The data excludes at 95% confidence level the existence ofsterile neutrinos in regions above 3~eV$^2$ previously unexplored byterrestrial experiments, including all space below 10~eV$^2$ suggested by therecently strengthened Gallium Anomaly. The best-fit point of the Neutrino-4reactor experiment's claimed observation of short-baseline oscillation is ruledout at more than five standard deviations.
PROSPECT实验旨在对紧凑型核反应堆堆芯短距离(7 - 9~m)的中微子消失进行精确搜索。这封信报告了利用2018年在高通量同位素反应堆运行的PROSPECT-I探测器的完整数据样本进行的一项新的中微子振荡分析的结果。该分析使用多周期选择的反贝塔衰变中微子相互作用,减少了背景并增强了统计能力,从而设定了与质量分裂为0.2 - 20 eV$^2$的不育中微子混合所引起的电子-中微子振荡的限制。研究发现,来自六个不同反应堆-探测器距离范围的反β衰变正电子能谱在统计上是相互一致的,这是在没有无源中微子振荡的情况下所预期的。这些数据在 95% 的置信水平上排除了先前未被地面实验探索过的 3~eV$^2$ 以上区域存在无源中微子的可能性,包括最近得到加强的镓异常所暗示的 10~eV$^2$ 以下的所有空间。中微子-4 反应堆实验声称观测到的短基线振荡的最佳拟合点被排除在五个标准偏差之外。
{"title":"Final Search for Short-Baseline Neutrino Oscillations with the PROSPECT-I Detector at HFIR","authors":"M. Andriamirado, B. Balantekin, C. D. Bass, O. Benevides Rodrigues, E. P. Bernard, N. S. Bowden, C. D. Bryan, R. Carr, T. Classen, A. J. Conant, G. Deichert, M. J. Dolinski, A. Erickson, A. Galindo-Uribarri, S. Gokhale, C. Grant, S. Hans, A. B. Hansell, K. M. Heeger, B. Heffron, D. E. Jaffe, S. Jayakumar, J. R. Koblanski, P. Kunkle, C. E. Lane, B. R. Littlejohn, A. Lozano Sanchez, X. Lu, F. Machado, J. Maricic, M. P. Mendenhall, A. M. Meyer, R. Milincic, P. E. Mueller, H. Mumm, R. Neilson, X. Qian, C. Roca, R. Rosero, P. Surukuchi, F. Sutanto, D. Venegas-Vargas, P. B. Weatherly, J. Wilhelmi, M. Yeh, C. Zhang, X. Zhang","doi":"arxiv-2406.10408","DOIUrl":"https://doi.org/arxiv-2406.10408","url":null,"abstract":"The PROSPECT experiment is designed to perform precise searches for\u0000antineutrino disappearance at short distances (7 - 9~m) from compact nuclear\u0000reactor cores. This Letter reports results from a new neutrino oscillation\u0000analysis performed using the complete data sample from the PROSPECT-I detector\u0000operated at the High Flux Isotope Reactor in 2018. The analysis uses a\u0000multi-period selection of inverse beta decay neutrino interactions with reduced\u0000backgrounds and enhanced statistical power to set limits on electron-flavor\u0000disappearance caused by mixing with sterile neutrinos with 0.2 - 20 eV$^2$ mass\u0000splittings. Inverse beta decay positron energy spectra from six different\u0000reactor-detector distance ranges are found to be statistically consistent with\u0000one another, as would be expected in the absence of sterile neutrino\u0000oscillations. The data excludes at 95% confidence level the existence of\u0000sterile neutrinos in regions above 3~eV$^2$ previously unexplored by\u0000terrestrial experiments, including all space below 10~eV$^2$ suggested by the\u0000recently strengthened Gallium Anomaly. The best-fit point of the Neutrino-4\u0000reactor experiment's claimed observation of short-baseline oscillation is ruled\u0000out at more than five standard deviations.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141521031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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arXiv - PHYS - Nuclear Experiment
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