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1. Kaonic atoms with SIDDHARTA-2 at the DAΦNE collider

Author

Sirghi F., Abbene L., Bazzi M., Bosnar D., Bragadireanu M., Buttacavoli A., Cargnelli M., Carminati M., Clozza A., Deda G., Del Grande R., Dulski K., De Paolis L., Fabbietti L., Fiorini C., Friščić I., Guaraldo C., Iliescu M., Iwasaki M., Khreptak A., Manti S., Marton J., Miliucci M., Moskal P., Napolitano F., Sgaramella F., Niedźwiecki S., Ohnishi H., Piscicchia K., Sada Y., Scordo A., Silarski M., Sirghi D., Skurzok M., Spallone A., Toho K., Tüchler M., Yoshida C., Zmeska J., and Curceanu C.

Subjects
Physics, QC1-999
Abstract

The most important information still missing in the field of the low-energy antikaon-nucleon inter actions studies is the experimental determination of the hadronic energy shift and width of kaonic deuterium. This measurement will be performed by the SIDDHARTA-2 experiment, installed at the DAΦNE collider and presently in data taking campaign. The precise measurement of the shift and width of the 1s level with respect to the purely electromagnetic calculated values, generated by the presence of the strong interaction, through the measurement of the X-ray transitions to this level, in kaonic hydrogen, was performed by the SIDDHARTA collaboration, the kaonic deuterium is underway by SIDDHARTA-2. These measurement will allow the first precise experimental extraction of the isospin dependent antikaon-nucleon scattering lengths, funda mental quantities for understanding low-energy QCD in the strangeness sector. The experimental challenge of the kaonic deuterium measurement is the very small X-rays yield, the even larger width (compared to kaonic hy drogen), and the difficulty to perform X-rays spectroscopy with weak signals in the high radiation environment of DAΦNE. It was, therefore, crucial to develop a new apparatus involving large-area X-rays detector system, to optimize the signal and to control and by improve the signal-to-background ratio by gaining in solid angle, increasing the timing capability, and as well implementing additional charge particle tracking veto systems.

Published
2024
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2. SIDDHARTA-2 veto system design and performance for kaonic atoms studies at DAΦNE

Author

Sgaramella F., Bazzi M., Bosnar D., Bragadireanu M., Cargnelli M., Carminati M., Clozza A., Deda G., Del Grande R., Dulski K., De Paolis L., Fabbietti L., Fiorini C., Friščić I., Guaraldo C., Iliescu M., Iwasaki M., Khreptak A., Manti S., Marton J., Miliucci M., Moskal P., Napolitano F., Niedźwiecki S., Ohnishi H., Piscicchia K., Sada Y., Scordo A., Silarski M., Sirghi D., Sirghi F., Skurzok M., Spallone A., Toho K., Tüchler M., Yoshida C., Zmeskal J., and Curceanu C.

Subjects
Physics, QC1-999
Abstract

Light kaonic atoms spectroscopy provides a unique approach to study the low-energy strong interaction in the strangeness sector. Precise measurements of X-ray emission from light kaonic atoms provide valuable information on kaon-nucleus interaction at threshold without the need for extrapolation as required in scattering experiments. The SIDDHARTA-2 experiment at the DAΦNE collider of INFN-LNF is now poised to perform the challenging measurements of the K−- d 2p → 1s transition to extract the isospin-dependent antikaonnucleon scattering lengths. To achieve this goal, the background reduction is a crucial factor. This paper provides an overview of the SIDDHARTA-2 Veto-1 system, which uses scintillators outside the vacuum chamber to detect charged particles produced by K− absorption by the nucleus. The arrival time of these particles is correlated with the position where the kaonic atom has been created inside the setup, allowing for the rejection of kaons stopped outside the target cell, which is a critical component for reducing the background and improve the accuracy of the measurement.

Published
2023
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3. Kaonic lead feasibility measurement at DA{\Phi}NE to solve the charged kaon mass discrepancy

Author

Bosnar, D., Abbene, L., Amsler, C., Artibani, F., Bazzi, M., Bragadireanu, M., Buttacavoli, A., Cargnelli, M., Carminati, M., Clozza, A., Clozza, F., Deda, G., De Paolis, L., Del Grande, R., Dulski, K., Fabbietti, L., Fiorini, C., Friščić, I., Guaraldo, C., Iliescu, M., Iwasaki, M., Khreptak, A., Makek, M., Manti, S., Marton, J., Moskal, P., Napolitano, F., Niedźwiecki, S., Ohnishi, H., Piscicchia, K., Scordo, A., Sgaramella, F., Sirghi, D., Sirghi, F., Skurzok, M., Silarski, M., Spallone, A., Toho, K., Tüchler, M., Doce, O. Vasquez, Zmeskal, J., and Curceanu, C.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

An HPGe detector equipped with a transistor reset preamplifier and readout with a CAEN DT5781 fast pulse digitizer was employed in the measurement of X-rays from kaonic lead at the DA$\Phi$NE $e^+e^-$ collider at the Laboratori Nazionali di Frascati of INFN. A thin scintillator in front of a lead target was used to select kaons impinging on it and to form the trigger for the HPGe detector. We present the results of the kaonic lead feasibility measurement, where we show that the resolution of the HPGe detector in regular beam conditions remains the same as that without the beam and that a satisfactory background reduction can be achieved. This measurement serves as a test bed for future dedicated kaonic X-rays measurements for the more precise determination of the charged kaon mass., Comment: 14 pages, 7 figures

Published
2024

4. Measurement of the mesonic decay branch of the $\bar{K}\!N\!N$ quasi-bound state

Author

Yamaga, T., Ajimura, S., Asano, H., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwai, M., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Murayama, R., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

We conducted measurements of $K^- + {^3{\rm He}} \to \pi \!Y \!N + N'$ reactions using a $1~{\rm GeV}/c$ $K^-$-beam, with the objective of understanding the broad decay width of $\bar{K} \!N \!N$ (approximately twice as broad as that of $\Lambda(1405)$ considered to be the $\bar{K} \!N$ quasi-bound state). We successfully reproduced distributions of the $\pi \! Y \! N$ invariant mass and momentum transfer for $\pi \! Y \! N$ using model fitting functions for $\bar{K} \!N \!N$ formation and quasi-free $\bar{K}$ absorption (${\rm QF}_{\bar{K}-{\rm abs}}$) processes. The model can describe the experimental data quite well, and four $\bar{K} \! N \! N \to \pi \! Y \! N $ cross-sections were obtained. The results indicate that mesonic decay is the dominant decay branch of $\bar{K} \! N \! N$. The results also suggest that $\Gamma_{\pi \Lambda N} \sim \Gamma_{\pi \Sigma N}$, which indicates that the $I_{\bar{K} \! N}=1$ absorption channel, in addition to the $I_{\bar{K} \! N}=0$ absorption channel, substantially contribute to the $\bar{K} \! N \! N$ decay, making the $\bar{K} \! N \! N$ state approximately twice as unstable as $\Lambda$(1405).

Published
2024

5. A multi-center, Phase II trial of nab-paclitaxel and gemcitabine in patients with non-small-cell lung cancer previously treated with platinum-based chemotherapy

Author

Tachihara M, Kiriu T, Hata A, Hatakeyama Y, Nakata K, Nagano T, Yamamoto M, Kobayashi K, Ohnishi H, Katakami N, and Nishimura Y

Subjects
nab-paclitaxel, gemcitabine, non-small cell lung cancer, Neoplasms. Tumors. Oncology. Including cancer and carcinogens, RC254-282
Abstract

Motoko Tachihara,1 Tatsunori Kiriu,1 Akito Hata,2 Yukihisa Hatakeyama,3 Kyosuke Nakata,1 Tatsuya Nagano,1 Masatsugu Yamamoto,1 Kazuyuki Kobayashi,1 Hisashi Ohnishi,3 Nobuyuki Katakami,2 Yoshihiro Nishimura11Division of Respiratory Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Hyogo 650-0017, Japan; 2Department of Medical Oncology, Kobe City Medical Center General Hospital, Kobe, Hyogo 650-0047, Japan; 3Department of Respiratory Medicine, Akashi Medical Center, Akashi, Hyogo 674-0063, JapanBackground: Nanoparticle albumin-bound paclitaxel (nab-PTX) plus gemcitabine (GEM) significantly improved overall survival in patients with metastatic pancreatic adenocarcinoma. Anti-tumor synergy between GEM and nab-PTX was recently demonstrated in a mouse model. We planned to assess the efficacy and safety of the combination of nab-PTX + GEM in patients with non-small-cell lung cancer (NSCLC) previously treated with platinum-based chemotherapy.Methods: Patients with advanced NSCLC with progressive disease after platinum-based chemotherapy, an Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0 or 1, and adequate kidney, liver and bone marrow function were eligible. Treatment consisted of nab-PTX (100 mg/m2) + GEM (1000 mg/m2) on days 1 and 8 of each 3-week cycle until progression disease or unacceptable toxicity occurred. The primary endpoint was progression-free survival (PFS).Results: Of the 28 patients enrolled, all were evaluable for response and toxicity. The median age was 68 years (range 47–79), and 23 were male and 5 female. The histologic subtypes were: adenocarcinoma in 19 patients, and squamous cell carcinoma in 9 patients. Seventeen patients had ECOG PS 1 and 11 patients had PS 0. Twenty-four patients were second line and 4 patients were third line. The median number of cycles administered was 4 (range 1–10). The overall response rate was 17.9%. The disease control rate was 67.9%. The median progression-free survival was 3.1 months (95% confidence interval [CI] =1.6–4.1). Adverse events were generally tolerable except grade 3 interstitial pneumonia with in 4 patients (14.3%).Conclusion: The efficacy of nab-PTX in combination with GEM in advanced second or third-line NSCLC patients was limited and the frequent occurrence of interstitial pneumonia was unacceptable.Keywords: nab-paclitaxel, gemcitabine, non-small-cell lung cancer

Published
2019

6. Trigger rejection factor in the first kaonic helium run with the complete SIDDHARTA-2 setup

Author

De Paolis L., Bazzi M., Bosnar D., Bragadireanu M., Cargnelli M., Carminati M., Clozza A., Deda G., Del Grande R., Fabbietti L., Fiorini C., Friščić I., Guaraldo C., Iliescu M., Iwasaki M., Khreptak A., King P., Sandri P. Levi, Manti S., Marton J., Miliucci M., Moskal P., Napolitano F., Niedźwiecki S., Ohnishi H., Piscicchia K., Sada Y., Scordo A., Sgaramella F., Shi H., Silarski M., Sirghi D.L., Sirghi F., Skurzok M., Spallone A., Toho K., Tüchler M., Doce O. Vazquez, Yoshida C., Zmeskal J., and Curceanu C.

Subjects
Physics, QC1-999
Abstract

The SIDDHARTA-2 experiment aims to perform the first measurement of the kaonic deuterium 2p → 1s x-ray transition energy. Such measurement, together with the measurement of kaonic hydrogen 2p → 1s x-ray energy transition performed by the SIDDHARTA experiment in 2011, allows the determination of kaon proton and kaon neutron scattering lengths and represents a fundamental input for the low energies QCD in the strangeness sector theory. The SIDDHARTA-2 experiment is presently installed at the DAΦNE electronpositron collider at the National Laboratories of Frascati, in Italy. In May 2022, the kaonic 4He x-ray transitions measurement was performed by the complete SIDDHARTA-2 setup, by using a gaseous target. The result of this measurement is presented in this paper, with a specific focus on the background rejection performed by the kaon trigger system.

Published
2022
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7. Clinical utility of fractional exhaled nitric oxide and blood eosinophils counts in the diagnosis of asthma-COPD overlap

Author

Takayama Y, Ohnishi H, Ogasawara F, Oyama K, Kubota T, and Yokoyama A

Subjects
asthma-COPD overlap, fractional exhaled nitric oxide, blood eosinophil counts, Diseases of the respiratory system, RC705-779
Abstract

Yusuke Takayama, Hiroshi Ohnishi, Fumiya Ogasawara, Kosuke Oyama, Tetsuya Kubota, Akihito Yokoyama Department of Hematology and Respiratory Medicine, Kochi Medical School, Kochi University, Nankoku City, Kochi, Japan Background: Asthma–COPD overlap (ACO) is difficult to diagnose because it is characterized by persistent airflow limitation, and patients present with several manifestations that are usually associated with both asthma and COPD. In this retrospective study, we aimed to evaluate the diagnostic accuracy of fractional exhaled nitric oxide (FeNO) and blood eosinophil counts for the clinical diagnosis of ACO.Patients and methods: A total of 121 patients were divided into two study groups, COPD alone or ACO, which was based on criteria from the joint document by the Global Initiative for Asthma and the Global initiative for chronic Obstructive Lung Disease. From July 2014 to April 2017, FeNO levels and blood eosinophil counts were measured in specimens from patients naïve to inhaled corticosteroids (ICS) and those using ICS. Receiver operating characteristic curve analysis was used to determine the cutoff values of FeNO and blood eosinophil levels that provided the best differential diagnosis between ACO and COPD.Results: Among a total of 121 patients, 65 patients were diagnosed with COPD and 56 patients with ACO. The FeNO level was higher in patients with ACO than in patients with COPD (median 24.5 vs 16.0 ppb, respectively; P

Published
2018

8. First measurement of kaonic helium-4 M-series transitions

Author

Sgaramella, F, Sirghi, D, Abbene, L, Artibani, F, Bazzi, M, Bosnar, D, Bragadireanu, M, Buttacavoli, A, Cargnelli, M, Carminati, M, Clozza, A, Clozza, F, Deda, G, Del Grande, R, De Paolis, L, Dulski, K, Fabbietti, L, Fiorini, C, Friscic, I, Guaraldo, C, Iliescu, M, Iwasaki, M, Khreptak, A, Manti, S, Marton, J, Miliucci, M, Moskal, P, Napolitano, F, Niedzwiecki, S, Ohnishi, H, Piscicchia, K, Principato, F, Scordo, A, Silarski, M, Sirghi, F, Skurzok, M, Spallone, A, Toho, K, Tuchler, M, Doce, O Vazquez, Yoshida, C, Zmeskal, J, and Curceanu, C

Subjects
Nuclear Experiment
Abstract

In this paper we present the results of a new kaonic helium-4 measurement with a 1.37 g/l gaseous target by the SIDDHARTA-2 experiment at the DA{\Phi}NE collider. We measured, for the first time, the energies and yields of three transitions belonging to the Mseries. Moreover, we improved by a factor about three, the statistical precision of the 2p level energy shift and width induced by the strong interaction, obtaining the most precise measurement for gaseous kaonic helium, and measured the yield of the L{\alpha} transition at the employed density, providing a new experimental input to investigate the density dependence of kaonic atoms transitions yield., Comment: 12 pages, 5 figures, 3 tables

Published
2023

9. CdZnTe detectors tested at the DA{\Phi}NE collider for future kaonic atoms measurements

Author

Scordo, A., Abbene, L., Artibani, F., Bazzi, M., Bettelli, M., Bosnar, D., Borghi, G., Bragadireanu, M., Buttacavoli, A., Cargnelli, M., Carminati, M., Clozza, A., Clozza, F., De Paolis, L., Deda, G., Del Grande, R., Fabbietti, L., Fiorini, C., Friščić, I., Guaraldo, C., Iliescu, M., Iwasaki, M., Khreptak, A., Manti, S., Marton, J., Moskal, P., Napolitano, F., Niedźwiecki, S., Ohnishi, H., Piscicchia, K., Principato, F., Sada, Y., Sgaramella, F., Shi, H., Silarski, M., Sirghi, D. L., Sirghi, F., Skurzok, M., Spallone, A., Toho, K., Tüchler, M., Yoshida, C., Zappettini, A., Zmeskal, J., and Curceanu, C.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The SIDDHARTA-2 collaboration at the INFN Laboratories of Frascati (LNF) aims to perform groundbreaking measurements on kaonic atoms. In parallel and beyond the ongoing kaonic deuterium, presently running on the DA$\Phi$NE collider at LNF, we plan to install additional detectors to perform further kaonic atoms' studies, taking advantage of the unique low energy and low momentum spread $K^-$ beam delivered by the at-rest decay of the $\phi$ meson. CdZnTe devices are ideal for detecting transitions toward both the upper and lower levels of intermediate-mass kaonic atoms, like kaonic carbon and aluminium, which have an important impact on the strangeness sector of nuclear physics. We present the results obtained in a set of preliminary tests conducted on DA$\Phi$NE, in view of measurements foreseen in 2024, with the twofold aim to tune the timing window required to reject the extremely high electromagnetic background, and to quantify the readout electronics saturation effect due to the high rate, when placed close to the Interaction Region (IR). In the first test we used commercial devices and electronics, while for the second one both were customized at the IMEM-CNR of Parma and the University of Palermo. The results confirmed the possibility of finding and matching a proper timing window where to identify the signal events and proved better performances, in terms of energy resolution, of the custom system. In both cases, strong saturation effects were confirmed, accounting for a loss of almost 90\% of the events, which will be overcome by a dedicated shielding structure foreseen for the final experimental setup.

Published
2023

10. Measurements of high-n transitions in intermediate mass kaonic atoms by SIDDHARTA-2 at DA$\mathrm{\Phi}$NE

Author

Sgaramella, F., Tüchler, M., Amsler, C., Bazzi, M., Bosnar, D., Bragadireanu, M., Cargnelli, M., Carminati, M., Clozza, A., Deda, G., Del Grande, R., De Paolis, L., Fabbietti, L., Fiorini, C., Friščić, I., Guaraldo, C., Iliescu, M., Iwasaki, M., Khreptak, A., Manti, S., Marton, J., Miliucci, M., Moskal, P., Napolitano, F., Niedźwiecki, S., Ohnishi, H., Piscicchia, K., Sada, Y., Scordo, A., Shi, H., Silarski, M., Sirghi, D., Sirghi, F., Skurzok, M., Spallone, A., Toho, K., Doce, O. Vazquez, Widmann, E., Yoshida, C., Zmeskal, J., and Curceanu, C.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

The SIDDHARTA-2 experiment installed at the DA$\mathrm{\Phi}$NE collider of INFN-LNF performed, for the first time, measurements of high-n transitions in intermediate mass kaonic atoms during the data taking campaigns of 2021 and 2022. Kaonic carbon, oxygen, nitrogen and aluminium transitions, which occur in the setup materials, were measured by using the kaons stopped in the gaseous helium target cell with aluminium frames and Kapton walls, and are reported in this paper. These new kaonic atoms measurements add valuable input to the kaonic atoms transitions data base, which is used as a reference for theories and models of the low-energy strong interaction between antikaon and nuclei. Moreover, these results pave the way for future dedicated kaonic atoms measurements through the whole periodic table and to a new era for the antikaon-nuclei studies at low energy., Comment: 8 pages, 7 figures

Published
2023
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11. Effects of aural stimulation with capsaicin ointment on swallowing function in elderly patients with non-obstructive dysphagia

Author

Kondo E, Jinnouchi O, Ohnishi H, Kawata I, Nakano S, Goda M, Kitamura Y, Abe K, Hoshikawa H, Okamoto H, and Takeda N

Subjects
Dysphagia, Swallowing reflex, Capsaicin ointment, Aural stimulation, Arnold ear-cough reflex, Geriatrics, RC952-954.6
Abstract

Eiji Kondo,1,2 Osamu Jinnouchi,3 Hiroki Ohnishi,3 Ikuji Kawata,3 Seiichi Nakano,2 Masakazu Goda,1 Yoshiaki Kitamura,1 Koji Abe,1 Hiroshi Hoshikawa,4 Hidehiko Okamoto,5 Noriaki Takeda1 1Department of Otolaryngology, University of Tokushima School of Medicine, Tokushima, Japan; 2Department of Otolaryngology, Kochi National Hospital, Kochi, Japan; 3Department of Otolaryngology, Anan Kyoei Hospital, Anan, Japan; 4Department of Otolaryngology, Kagawa University School of Medicine, Kagawa, Japan; 5Department of Sensori-Motor Integration, National Institute for Physiological Sciences, Okazaki, Japan Objective: In the present study, an attempt was made to examine the effects of aural ­stimulation with ointment containing capsaicin on swallowing function in order to develop a novel and safe treatment for non-obstructive dysphagia in elderly patients. Design: A prospective pilot, non-blinded, non-controlled study with case series evaluating a new treatment. Setting: Secondary hospitals. Patients and methods: The present study included 26 elderly patients with non-obstructive dysphagia. Ointment containing 0.025% capsaicin (0.5 g) was applied to the external auditory canal with a cotton swab under otoscope only once or once a day for 7 days before swallowing of a bolus of colored water (3 mL), which was recorded by transnasal videoendoscopy and evaluated according to the endoscopic swallowing score. Results: After a single application of 0.025% capsaicin ointment to the right external auditory canal, the endoscopic swallowing score was significantly decreased, and this effect lasted for 60 minutes. After repeated applications of the ointment to each external auditory canal alternatively once a day for 7 days, the endoscopic swallowing score decreased significantly in patients with more severe non-obstructive dysphagia. Of the eight tube-fed patients of this group, three began direct swallowing exercises using jelly, which subsequently restored their oral food intake.Conclusion: These findings suggest that stimulation of the external auditory canal with ointment containing capsaicin improves swallowing function in elderly patients with non-obstructive dysphagia. By the same mechanism used by angiotensin-converting enzyme inhibitors to induce cough reflex, which has been shown to prevent aspiration pneumonia, aural stimulation with capsaicin may reduce the incidence of aspiration pneumonia in dysphagia patients via Arnold’s ear-cough reflex stimulation. Keywords: swallowing reflex, Arnold’s ear-cough reflex, external auditory canal, oral food intake

Published
2014

12. Precise lifetime measurement of $^4_\Lambda$H hypernucleus using in-flight $^4$He$(K^-, \pi^0)^4_\Lambda$H reaction

Author

Akaishi, T., Asano, H., Chen, X., Clozza, A., Curceanu, C., Del Grande, R., Guaraldo, C., Han, C., Hashimoto, T., Iliescu, M., Inoue, K., Ishimoto, S., Itahashi, K., Iwasaki, M., Ma, Y., Miliucci, M., Murayama, R., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, S., Tanida, K., Toda, T., Tokuda, M., Yamaga, T., Yuan, X., Zhang, P., Zhang, Y., and Zhang, H.

Subjects
Nuclear Experiment
Abstract

We present a new measurement of the $^4_\Lambda$H hypernuclear lifetime using in-flight $K^-$ + $^4$He $\rightarrow$ $^4_\Lambda$H + $\pi^0$ reaction at the J-PARC hadron facility. We demonstrate, for the first time, the effective selection of the hypernuclear bound state using only the $\gamma$-ray energy decayed from $\pi^0$. This opens the possibility for a systematic study of isospin partner hypernuclei through comparison with data from ($K^-$, $\pi^-$) reaction. As the first application of this method, our result for the $^4_\Lambda$H lifetime, $\tau(^4_\Lambda \mathrm{H}) = 206 \pm 8 (\mathrm{stat.}) \pm 12 (\mathrm{syst.})\ \mathrm{ps}$, is one of the most precise measurements to date. We are also preparing to measure the lifetime of the hypertriton ($^3_\Lambda$H) using the same setup in the near future.

Published
2023
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13. New opportunities for kaonic atoms measurements from CdZnTe detectors

Author

Abbene, L., Bettelli, M., Buttacavoli, A., Principato, F., Zappettini, A., Amsler, C., Bazzi, M., Bosnar, D., Bragadireanu, M., Cargnelli, M., Carminati, M., Clozza, A., Deda, G., De Paolis, L., Del Grande, R., Fabbietti, L., Fiorini, C., Friščić, I., Guaraldo, C., Iliescu, M., Iwasaki, M., Khreptak, A., Manti, S., Marton, J., Miliucci, M., Moskal, P., Napolitano, F., Niedźwiecki, S., Ohnishi, H., Piscicchia, K., Sada, Y., Sgaramella, F., Shi, H., Silarski, M., Sirghi, D. L., Sirghi, F., Skurzok, M., Spallone, A., Toho, K., Tüchler, M., Doce, O. Vazquez, Yoshida, C., Zmeskal, J., Scordo, A., and Curceanu, C.

Subjects
Physics - Instrumentation and Detectors
Abstract

We present the tests performed by the SIDDHARTA-2 collaboration at the DA{\Phi}NE collider with a quasi-hemispherical CdZnTe detector. The very good room-temperature energy resolution and efficiency in a wide energy range show that this detector technology is ideal for studying radiative transitions in intermediate and heavy-mass kaonic atoms. The CdZnTe detector was installed for the first time in an accelerator environment to perform tests on the background rejection capabilities, which were achieved by exploiting the SIDDHARTA-2 Luminosity Monitor. A spectrum with an $^{241}Am$ source has been acquired, with beams circulating in the main rings, and peak resolutions of 6% at 60 keV and of 2.2% at 511 keV have been achieved. The background suppression factor, which turned out to be of the order of $\simeq10^{5-6}$, opens the possibility to plan for future kaonic atom measurements with CdZnTe detectors.

Published
2023
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14. Pole position of $\Lambda(1405)$ measured in $d(K^-,n)\pi\Sigma$ reactions

Author

Collaboration, J-PARC E31, Aikawa, S., Ajimura, S., Akaishi, T., Asano, H., Beer, G., Berucci, C., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishimoto, S., Ishikawa, T., Itahashi, K., Iwai, M., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Komatsu, Y., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Murayama, R., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Omar, Z., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokiyasu, A. O., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Vazquez-Doce, O., Widmann, E., Yamaga, T., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

We measured a set of $\pi^\pm\Sigma^\mp$, $\pi^0\Sigma^0$, and $\pi^-\Sigma^0$ invariant mass spectra below and above the $\bar{K}N$ mass threshold in $K^-$-induced reactions on deuteron. We deduced the $S$-wave $\bar{K}N\rightarrow\pi\Sigma$ and $\bar{K}N\rightarrow\bar{K}N$ scattering amplitudes in the isospin 0 channel in the framework of a $\bar{K}N$ and $\pi\Sigma$ coupled channel. We find that a resonance pole corresponding to $\Lambda(1405)$ is located at 1417.7$^{+6.0}_{-7.4}$(fitting errors)$^{+1.1}_{-1.0}$(systematic errors) + $[-26.1^{+6.0}_{-7.9}$(fitting errors)$^{+1.7}_{-2.0}$(systematic errors)]$i$ MeV/$c^2$, closer to the $\bar{K}N$ mass threshold than the value determined by the Particle Data Group., Comment: 8 pages, 5 figures

Published
2022
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15. Studies of the linearity and stability of Silicon Drift Detectors for kaonic atoms X-ray spectroscopy

Author

Khreptak, A., Amsler, C., Bazzi, M., Bosnar, D., Bragadireanu, M., Carminati, M., Cargnelli, M., Clozza, A., Deda, G., De Paolis, L., Del Grande, R., Fabbietti, L., Fiorini, C., Guaraldo, C., Iliescu, M., Iwasaki, M., Manti, S., Marton, J., Miliucci, M., Moskal, P., Napolitano, F., Niedźwiecki, S., Ohnishi, H., Piscicchia, K., Sada, Y., Scordo, A., Sgaramella, F., Shi, H., Silarski, M., Sirghi, D., Sirghi, F., Skurzok, M., Spallone, A., Toho, K., Tüchler, M., Doce, O. Vazquez, Zmeskal, J., Yoshida, C., and Curceanu, C.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The SIDDHARTA-2 experiment at the DA$\Phi$NE collider aims to perform precision measurements of kaonic atoms X-ray spectroscopy for the investigation of the antikaon-nucleon strong interaction. To achieve this goal, novel large-area Silicon Drift Detectors (SDDs) have been developed. These devices have special geometry, field configuration and readout electronics that ensure excellent performance in terms of linearity and stability. The paper presents preliminary results for the linearity determination and stability monitoring of the SDDs system during the measurement of kaonic deuterium carried out in the summer of 2022.

Published
2022

16. First tests of the full SIDDHARTA-2 experimental apparatus with a 4 He gaseous target

Author

Scordo, A., Amsler, C., Bazzi, M., Bosnar, D., Bragadireanu, M., Cargnelli, M., Carminati, M., Clozza, A., Deda, G., De Paolis, L., Del Grande, R., Fabbietti, L., Fiorini, C., Guaraldo, C., Iliescu, M., Iwasaki, M., Khreptak, A., King, P., Sandri, P. Levi, Manti, S., Marton, J., Miliucci, M., Moskal, P., Napolitano, F., Niedźwiecki, S., Ohnishi, H., Piscicchia, K., Sada, Y., Sgaramella, F., Shi, H., Silarski, M., Sirghi, D. L., Sirghi, F., Skurzok, M., Spallone, A., Toho, K., Tüchler, M., Doce, O. Vazquez, Yoshida, C., Zmeskal, J., and Curceanu, C.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

In this paper, we present the first tests performed after the full installation of the SIDDHARTA-2 experimental apparatus on the Interaction Region of the DA{\Phi}NE collider at the INFN National Laboratories of Frascati. Before starting the first measurement of the kaonic deuterium 2p{\rightarrow}1s transition, accurate evaluation of the background rejection. mainly achieved with the Kaon Trigger system, was required. This run, performed in the period 04-26/05/2022 with a 4 He gaseous target, confirmed the 10^5 rejection factor obtained with a reduced version of the setup and different machine conditions in 2021. This important outcome motivated the filling of the target cell with deuterium and the starting of the measurement campaign of the kaonic deuterium 2p{\rightarrow}1s transition.

Published
2022
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17. Differential cross sections and photon beam asymmetries of $\eta$ photoproduction on the proton at $E_\gamma$ = 1.3-2.4 GeV

Author

Hashimoto, T., Nam, T., Muramatsu, N., Ahn, J. K., Chang, W. C., Chen, J. Y., Chu, M. L., Date, S., Gogami, T., Goto, H., Hamano, H., He, Q. H., Hicks, K., Hiraiwa, T., Honda, Y., Hotta, T., Ikuno, H., Inoue, Y., Ishikawa, T., Jaegle, I., Jo, J. M., Kasamatsu, Y., Katsuragawa, H., Kido, S., Kon, Y., Matsumoto, S., Matsumura, Y., Miyabe, M., Mizutani, K., Nakamura, T., Nakano, T., Niiyama, M., Nozawa, Y., Ohashi, Y., Ohnishi, H., Ohta, T., Ozawa, K., Rangacharyulu, C., Ryu, S. Y., Sada, Y., Shibukawa, T., Shimizu, H., Shirai, R., Shiraishi, K., Strokovsky, E. A., Sugaya, Y., Sumihama, M., Suzuki, S., Tanaka, S., Taniguchi, Y., Tokiyasu, A., Tomida, N., Tsuchikawa, Y., Ueda, T., Yamazaki, H., Yamazaki, R., Yanai, Y., Yorita, T., Yoshida, C., and Yosoi, M.

Subjects
Nuclear Experiment
Abstract

We have carried out exclusive measurements for the photoproduction of an $\eta$ meson from a proton target with an egg-shaped calorimeter made of BGO crystals (BGOegg) and forward charged-particle detectors at the SPring-8 LEPS2 beamline. The differential cross sections and photon beam asymmetries of the $\gamma p \to \eta p$ reaction are measured in a center-of-mass energy ($W$) range of $1.82$-$2.32$ GeV and a polar angle range of $-1.0 < \cos{\theta^{\eta}_{\mathrm{c.m.}}} < 0.6$. The reaction is identified by selecting a proton and two $\gamma$'s produced by an $\eta$-meson decay. The kinematic fit method was employed to select the reaction candidate with the confidence level larger than $1$\%. A bump structure at $W$ = $2.0$-$2.3$ GeV in the differential cross section is confirmed at extremely backward $\eta$ polar angles, where the existing data are inconsistent with each other. This bump structure is likely associated with high-spin resonances that couple with $s\bar{s}$ quarks. The results of the photon beam asymmetries in a wide $\eta$ polar angle range are new for the photon beam energies exceeding $2.1$ GeV. These results are not reproduced by the existing partial wave analyses. They provide an additional constraint to nucleon resonance studies at high energies., Comment: 16 pages, 11 figures

Published
2022
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18. SPring-8 LEPS2 beamline: A facility to produce a multi-GeV photon beam via laser Compton scattering

Author

Muramatsu, N., Yosoi, M., Yorita, T., Ohashi, Y., Ahn, J. K., Ajimura, S., Asano, Y., Chang, W. C., Chen, J. Y., Date, S., Gogami, T., Hamano, H., Hashimoto, T., Hiraiwa, T., Hotta, T., Ishikawa, T., Kasamatsu, Y., Katsuragawa, H., Kobayakawa, R., Kohri, H., Masumoto, S., Matsumura, Y., Miyabe, M., Mizutani, K., Morino, Y., Nakano, T., Nam, T., Niiyama, M., Nozawa, Y., Ohkuma, H., Ohnishi, H., Ohta, T., Oishi, M., Ozawa, K., Ryu, S. Y., Sada, Y., Saito, H., Shibukawa, T., Shimizu, H., Shirai, R., Shoji, M., Sumihama, M., Suzuki, S., Tanaka, S., Taniuchi, Y., Tokiyasu, A. O., Tomida, N., Tsuchikawa, Y., Watanabe, K., Yoon, C. J., and Yoshida, C.

Subjects
Physics - Accelerator Physics, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

We have constructed a new laser-Compton-scattering facility, called the LEPS2 beamline, at the 8-GeV electron storage ring, SPring-8. This facility provides a linearly polarized photon beam in a tagged energy range of 1.3--2.4 GeV. Thanks to a small divergence of the low-emittance storage-ring electrons, the tagged photon beam has a size (sigma) suppressed to about 4 mm even after it travels about 130 m to the experimental building that is independent of the storage ring building and contains large detector systems. This beamline is designed to achieve a photon beam intensity higher than that of the first laser-Compton-scattering beamline at SPring-8 by adopting the simultaneous injection of up to four high-power laser beams and increasing a transmittance for the long photon-beam path up to about 77%. The new beamline is under operation for hadron photoproduction experiments.

Published
2021
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19. Recent results and future prospects of kaonic nuclei at J-PARC

Author

Sakuma, F., Ajimura, S., Akaishi, T., Asano, H., Bazzi, M., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Clozza, A., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwasaki, M., Iwai, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Miliucci, M., Mizoi, Y., Morra, O., Murayama, R., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Ozawa, K., Piscicchia, K., Sada, Y., Sakaguchi, A., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Simon, M., Sirghi, D., Sirghi, F., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vázquez, Widmann, E., Yamaga, T., Yamazaki, T., Yoshida, C., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

$\bar K$-nuclear bound systems, kaonic nuclei, have been widely discussed as products of the strongly attractive $\bar K N$ interaction in $I = 0$ channels. Recently, we demonstrated that kaonic nuclei can be produced via in-flight $(K^-,N)$ reactions using the low-momentum DC kaon beam at the J-PARC E15 experiment. We observed the simplest kaonic nuclei, $K^-pp$, having a much deeper binding energy than normal nuclei. For further studies, we have proposed a series of experimental programs for the systematic investigation of light kaonic nuclei, from $\bar K N$ ($\Lambda(1405)$) to $\bar K NNNN$. In the new experiment approved as J-PARC E80, we will measure the $\bar K NNN$ ($A=3$) system as a first step toward a comprehensive study., Comment: 10 pages, 5 figures, proceedings of the 8th Asia-Pacific Conference on Few-Body Problems in Physics (APFB2020), accepted for publication in Fwe-Body Systems

Published
2021
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20. Fundamental physics at the strangeness frontier at DA{\Phi}NE. Outline of a proposal for future measurements

Author

Curceanu, C., Guaraldo, C., Scordo, A., Sirghi, D., Piscicchia, K., Amsler, C., Zmeskal, J., Bosnar, D., Eidelman, S., Ohnishi, H., and Sada, Y.

Subjects
Nuclear Experiment
Abstract

The DA{\Phi}NE collider at INFN-LNF is a unique source of low-energy kaons, which was used by the DEAR, SIDDHARTA and AMADEUS collaborations for unique measurements of kaonic atoms and kaon-nuclei interactions. Presently, the SIDDHARTA-2 collaboration is underway to measure the kaonic deuterium exotic atom. With this document we outline a proposal for fundamental physics at the strangeness frontier for future measurements of kaonic atoms and kaon-nuclei interactions at DA{\Phi}NE, which is intended to stimulate discussions within the broad scientific community performing research directly or indirectly related to this field.

Published
2021

21. A search for the K−pp bound state in the 3He(K−in-flight, n) reaction at J-PARC

Author

Hashimoto T., Ajimura S., Beer G., Bhang H., Bragadireanu M., Buehler P., Busso L., Cargnelli M., Choi S., Curceanu C., Enomoto S., Faso D., Fujioka H., Fujiwara Y., Fukuda T., Guaraldo C., Hayano R. S., Hiraiwa T., Iio M., Iliescu M., Inoue K., Ishiguro Y., Ishikawa T., Ishimoto S., Ishiwatari T., Itahashi K., Iwai M., Iwasaki M., Kato Y., Kawasaki S., Kienle P., Kou H., Ma Y., Marton J., Matsuda Y., Mizoi Y., Morra O., Nagae T., Noumi H., Ohnishi H., Okada S., Outa H., Piscicchia K., Poli Lener M., Romero Vida A., Sada Y., Sakaguchi A., Sakuma F., Sato M., Scordo A., Sekimoto M., Shi H., Sirghi D., Sirghi F., Suzuki K., Suzuki S., Suzuki T., Tanida K., Tatsuno H., Tokuda M., Tomono D., Toyoda A., Tsukada K., Vazquez Doce O., Widmann E., Wuenschek B. K., Yamaga T., Yamazaki T., Yim H., Zhang Q., and Zmeska J.

Subjects
Physics, QC1-999
Abstract

We have collected the first physics data of an experimental search for the simplest kaonic nuclear bound state, “K− pp”, by the 3He(K− n) reaction at J-PARC. We confirmed that our spectrometer system works as designed and observed clear peak structure composed of the quasi-elastic K−“n” → K−n and the charge-exchange K−“p” → ¯̅K0n reactions in the forward neutron spectrum.

Published
2014
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22. Search for the K−pp bound state via the in-flight 3He(K−, n) reaction

Author

Sada Y., Ajimura S., Beer G., Bhang H., Bragadireanu M., Buehler P., Busso L., Cargnelli M., Choi S., Curceanu C., Enomoto S., Faso D., Fujioka H., Fujiwara Y., Fukuda T., Guaraldo C., Hashimoto T., Hayano R. S., Hiraiwa T., Iio M., Iliescu M., Inoue K., Ishiguro Y., Ishikawa T., Ishimoto S., Ishiwatari T., Itahashi K., Iwai M., Iwasaki M., Kato Y., Kawasaki S., Kienle P., Kou H., Ma Y., Marton J., Matsuda Y., Mizoi Y., Morra O., Nagae T., Noumi H., Ohnishi H., Okada S., Outa H., Piscicchia K., Poli Lener M., Romero Vidal A., Sakaguchi A., Sakuma F., Sato M., Scordo A., Sekimoto M., Shi H., Sirghi D., Sirghi F., Suzuki K., Suzuki S., Suzuki T., Tanida K., Tatsuno H., Tokuda M., Tomono D., Toyoda A., Tsukada K., Vazquez Doce O., Widmann E., Weunschek B. K., Yamaga T., Yamazaki T., Yim H., Zhang Q., and Zmeskal J.

Subjects
Physics, QC1-999
Abstract

In the J-PARC E15 experiment, a K− pp search was performed via the 3He(K−, n) reaction at 1.0 GeV/c. A forward-going neutron is detected by a neutron counter with 15 m flight length, and decay particles from K− pp are simultaneously measured by a cylindrical detector system that surrounds a liquid 3He target system. In March and May, 2013, we carried out the first physics data-taking with 5×109 incident kaons on the 3He target, and we have obtained a preliminary exclusive analysis result of 3He(K−, Λp)n reaction.

Published
2014
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23. Nuclear dependence of light neutral meson production in p-A collisions at 400 GeV with NA60

Author

Arnaldi, R., Banicz, K., Borer, K., Castor, J., Chaurand, B., Chen, W., Cicalò, C., Colla, A., Cortese, P., Damjanovic, S., David, A., De Falco, A., Devaux, A., Ducroux, L., En'yo, H., Fargeix, J., Ferretti, A., Floris, M., Förster, A., Force, P., Guettet, N., Guichard, A., Gulkanian, H., Heuser, J. M., Jarron, P., Keil, M., Kluberg, L., Li, Z., Lourenço, C., Lozano, J., Manso, F., Martins, P., Masoni, A., Neves, A., Ohnishi, H., Oppedisano, C., Parracho, P., Pillot, P., Poghosyan, T., Puddu, G., Radermacher, E., Ramalhete, P., Rosinsky, P., Scomparin, E., Seixas, J., Serci, S., Shahoyan, R., Sonderegger, P., Specht, H. J., Tieulent, R., Uras, A., Usai, G., Veenhof, R., and Wöhri, H. K.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

The NA60 experiment has studied low-mass muon pair production in proton-nucleus collisions with a system of Be, Cu, In, W, Pb and U targets, using a 400 GeV proton beam at the CERN SPS. The transverse momentum spectra of the $\rho/\omega$ and $\phi$ mesons are measured in the full $p_\mathrm{T}$ range accessible, from $p_\mathrm{T} = 0$ up to 2 GeV/$c$. The nuclear dependence of the production cross sections of the $\eta$, $\omega$ and $\phi$ mesons has been found to be consistent with the power law $\sigma_\mathrm{pA} \propto \mathrm{A}^\alpha$, with the $\alpha$ parameter increasing as a function of $p_\mathrm{T}$ for all the particles, and an approximate hierarchy $\alpha_\eta \approx \alpha_\phi > \alpha_\omega$. The cross section ratios $\sigma_\eta/\sigma_\omega$, $\sigma_\rho/\sigma_\omega$ and $\sigma_\phi/\sigma_\omega$ have been studied as a function of the size A of the production target, and an increase of the $\eta$ and $\phi$ yields relative to the $\omega$ is observed from p-Be to p-U collisions.

Published
2020
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24. Observation of a $\bar{K}NN$ bound state in the $^3{\rm He} (K^-, \Lambda p)n$ reaction

Author

Yamaga, T., Ajimura, S., Asano, H., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwai, M., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

We have performed an exclusive measurement of the $K^{-}+\! ~^{3}{\rm He} \to \Lambda pn$ reaction at an incident kaon momentum of $1\ {\rm GeV}/c$.In the $\Lambda p$ invariant mass spectrum, a clear peak was observed below the mass threshold of $\bar{K}\!+\!N\!+\!N$, as a signal of the kaonic nuclear bound state, $\bar{K}NN$.The binding energy, decay width, and $S$-wave Gaussian reaction form-factor of this state were observed to be $B_{K} = 42\pm3({\rm stat.})^{+3}_{-4}({\rm syst.})\ {\rm MeV}$, $\Gamma_{K} = 100\pm7({\rm stat.})^{+19}_{-9}({\rm syst.})\ {\rm MeV}$, and $Q_{K} = 383\pm11({\rm stat.})^{+4}_{-1}({\rm syst.})\ {\rm MeV}/c$, respectively. The total production cross-section of $\bar{K}NN$, determined by its $\Lambda p$ decay mode, was $\sigma^{tot}_{K} \cdot BR_{\Lambda p} = 9.3\pm0.8({\rm stat.})^{+1.4}_{-1.0}({\rm syst.})\ \mu{\rm b}$.We estimated the branching ratio of the $\bar{K}NN$ state to the $\Lambda p$ and $\Sigma^{0}p$ decay modes as $BR_{\Lambda p}/BR_{\Sigma^{0}p} \sim 1.7$, by assuming that the physical processes leading to the $\Sigma N\!N$ final states are analogous to those of $\Lambda pn$., Comment: 13 pages, 12 figures

Published
2020
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25. Search for $\eta'$ bound nuclei in the $^{12}{\rm C}(\gamma,p)$ reaction with simultaneous detection of decay products

Author

Tomida, N., Muramatsu, N., Niiyama, M., Ahn, J. K., Chang, W. C., Chen, J. Y., Chu, M. L., Daté, S., Gogami, T., Goto, H., Hamano, H., Hashimoto, T., He, Q. H., Hicks, K., Hiraiwa, T., Honda, Y., Hotta, T., Ikuno, H., Inoue, Y., Ishikawa, T., Jaegle, I., Jo, J. M., Kasamatsu, Y., Katsuragawa, H., Kido, S., Kon, Y., Maruyama, T., Masumoto, S., Matsumura, Y., Miyabe, M., Mizutani, K., Nagahiro, H., Nakamura, T., Nakano, T., Nam, T., Ngan, T. N. T., Nozawa, Y., Ohashi, Y., Ohnishi, H., Ohta, T., Ozawa, K., Rangacharyulu, C., Ryu, S. Y., Sada, Y., Sasagawa, M., Shibukawa, T., Shimizu, H., Shirai, R., Shiraishi, K., Strokovsky, E. A., Sugaya, Y., Sumihama, M., Suzuki, S., Tanaka, S., Tokiyasu, A., Tsuchikawa, Y., Ueda, T., Yamazaki, H., Yamazaki, R., Yanai, Y., Yorita, T., Yoshida, C., and Yosoi, M.

Subjects
Nuclear Experiment
Abstract

We measured missing mass spectrum of the $^{12}{\rm C}(\gamma,p)$ reaction for the first time in coincidence with potential decay products from $\eta'$ bound nuclei. We tagged an ($\eta+p$) pair associated with the $\eta'N\to\eta N$ process in a nucleus. After applying kinematical selections to reduce backgrounds, no signal events were observed in the bound-state region. An upper limit of the signal cross section in the opening angle $\cos\theta^{\eta p}_{lab}<-0.9$ was obtained to be 2.2 nb/sr at the 90$\%$ confidence level. It is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree $\eta'$ production rate. Our results indicate a small branching fraction of the $\eta'N\to\eta N$ process and/or a shallow $\eta'$-nucleus potential., Comment: 7 pages, 4 figures

Published
2020
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26. Precision Spectroscopy of Kaonic Helium-3 Atoms X-rays at J-PARC

Author

Tanida K., Suzuki T., Sirghi F., Sirghi D., Shi H., Sekimoto M., Sato M., Sakuma F., Outa H., Okada S., Ohnishi H., Noumi H., Matsuda Y., Marton J., Kienle P., Kou H., Iwasaki M., Itahashi K., Ishiwatari T., Ishimoto S., Hiraiwa T., Hayano R.S., Hashimoto T., Guaraldo C., Fujiwara Y., Fujioka H., Enomoto S., Doce O.V., Curceanu C., Choi S., Cargnelli M., Bhang H., Iio M., Tatsuno H., Tokuda M., Tomono D., Toyoda A., Tsukada K., Vidal A.R., Widmann E., Wunschek B., Yamazaki T., and Zmeskal J.

Subjects
Physics, QC1-999
Abstract

We will measure the Balmer-series x-rays of kaonic-3He atoms using large-area high-resolution silicon drift x-rays detectors in order to provide the crucial information of K−-nucleus strong interaction at the low energy limit. The strong interaction 2p level shift will be determined with a precision of a few eV. At the present status, the construction of all detectors is in progress. In February, 2009, the first tuning of K1.8BR beamline was performed by the secondary beam generated in J-PARC hadron facility. The data taking will be started soon.

Published
2010
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27. A search for deeply-bound kaonic nuclear states at J-PARC

Author

Sakaguchi A., Sada Y., Pietreanu D., Outa H., Okada S., Ohnishi H., Noumi H., Nagae T., Morra O., Mizoi Y., Matsuda Y., Marton J., Kienle P., Kou H., Iwasaki M., Iwai M., Itahashi K., Ishiwatari T., Ishimoto S., Ishikawa T., Inoue K., Iliescu M., Iio M., Hiraiwa T., Hayano R.S., Hashimoto T., Guaraldo C., Fukuda Y., Fukuda T., Fujiwara Y., Faso D., Fujioka H., Enomoto S., Curceanu C., Choi S., Cargnelli M., Busso L., Buehler P., Bragadireanu M., Bhang H., Beer G., Ajimura S., Sakuma F., Sato M., Sekimoto M., Sirghi D., Sirghi F., Suzuki K., Suzuki S., Suzuki T., Tatsuno H., Tokuda M., Tomono D., Toyoda A., Tsukada K., Widmann E., Yamazaki T., Yim H., and Zmeskal J.

Subjects
Physics, QC1-999
Abstract

The J-PARC E15 experiment will be performed to search for the simplest kaonic nuclear bound state, K− pp, by the in-flight 3He(K−,n) reaction. The exclusive measurement can be performed by a simultaneous measurement of the missing mass using the primary neutron and the invariant mass via the expected decay, K− pp → Λp → pπ− p. In this report, an overview of the experiment and the preparation status are presented.

Published
2010
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28. Write-ups for workshop on the project for the hadron experimental facility of J-PARC, Partial collection of LOIs at the extended hadron hall and the related topics

Author

Association, Hadron Hall Users', Achenbach, P., Ahn, J. K., Ajimura, S., Akaishi, T., Akaishi, Y., Andersson, W. Ikegami, Aoki, K., Asano, H., Bleser, S., Botta, E., Bölting, M., Chang, WC., Feliciello, A., Fujioka, H., Hassanvand, M., Honda, R., Ichikawa, Y., Ishikawa, T., Itahashi, K., Komatsu, Y., Miwa, K., Miyachi, Y., Morino, Y., Nakano, T., Nakamura, S. N., Naruki, M., Noumi, H., Ohnishi, H., Okada, S., Ozawa, K., Pochodzalla, J., Sako, H., Sakuma, F., Sawada, T., Schupp, F., Shirotori, K., Steinen, M., Sugaya, Y., Suzuki, K., Takahashi, H., Takahashi, T., Takahashi, T. N., Tanaka, K., Tomida, N., Ukai, M., Yamaga, T., Yamamoto, T., Yamazaki, T., Yang, S., Yue, M., and Collaboration, J-PARC KOTO

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

This write-up document is a summary of International workshop on the project for the extended hadron experimental facility which was held from March 26 to 28, 2018 at KEK Tokai Campus. This document is a collection of Letter Of Intents (LOIs) related to the proposed beam lines in the extended hadron experimental facility at J-PARC.

Published
2019

29. A compensated multi-gap RPC with 2 m-long strips for the LEPS2 experiment

Author

Watanabe, K., Tanaka, S., Chang, W. C., Chen, H., Chu, M. L., Cuenca-Garcia, J. J., Gogami, T., Gonzalez-Diaz, D., Niiyama, M., Ohashi, Y., Ohnishi, H., Tomida, N., and Yosoi, M.

Subjects
Physics - Instrumentation and Detectors
Abstract

We have developed multi-gap resistive plate chambers (MRPCs) with 2.5 x 200 cm2 readout strips for the time-of-flight (TOF) detector system of the LEPS2 experiment at SPring-8. These chambers consist of 2 stacks and 5 gas gaps per stack, in a mirrored configuration. A time resolution of sigma ~ 80 ps was achieved for any position within a strip (at above 99% detection efficiency); after performing the time-charge slewing correction, this value could be reduced to 60 ps. A link between the small contribution of the slewing correction to timing and the suppression of modal dispersion in the detector could be established.

Published
2018
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30. '$\mathbf{{\textit K^-}{\textit p}{\textit p}}$', a ${\overline{K}}$-Meson Nuclear Bound State, Observed in $^{3}{\rm He}({K^-}, {\Lambda} p)n$ Reactions

Author

collaboration, J-PARC E15, Ajimura, S., Asano, H., Beer, G., Berucci, C., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamaga, T., Yamazaki, T., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

We observed a distinct peak in the $\Lambda p$ invariant mass spectrum of $^{3}{\rm He}(K^-, \, \Lambda p)n$, well below the mass threshold of $m_K + 2 m_p$. By selecting a relatively large momentum-transfer region $q = 350 \sim 650$ MeV/$c$, one can clearly separate the peak from the quasi-free process, $\overline{K}N \rightarrow \overline{K}N$ followed by the non-resonant absorption by the two spectator-nucleons $\overline{K}NN \rightarrow \Lambda N $. We found that the simplest fit to the observed peak gives us a Breit-Wigner pole position at $B_{\rm {\it Kpp}} = 47 \pm 3 \, (stat.) \,^{+3}_{-6} \,(sys.)$ MeV having a width $\Gamma_{\rm {\it Kpp}} = 115 \pm 7 \, (stat.) \,^{+10}_{-9} \,(sys.)$ MeV, and the $S$-wave Gaussian reaction form-factor parameter $Q_{\rm {\it Kpp}} = 381 \pm 14 \, (stat.)\,^{+57}_{-0} \,(sys.)$ MeV/$c$, as a new form of the nuclear bound system with strangeness -- "$K^-pp$"., Comment: 17 pages, 4 figures

Published
2018

31. Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., Al-Bataineh, H., Alexander, J., Alfred, M., Al-Jamel, A., Al-Ta'ani, H., Angerami, A., Aoki, K., Apadula, N., Aphecetche, L., Aramaki, Y., Armendariz, R., Aronson, S. H., Asai, J., Asano, H., Aschenauer, E. C., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Bagoly, A., Bai, M., Baksay, G., Baksay, L., Baldisseri, A., Bannier, B., Barish, K. N., Barnes, P. D., Bassalleck, B., Basye, A. T., Bathe, S., Batsouli, S., Baublis, V., Bauer, F., Baumann, C., Baumgart, S., Bazilevsky, A., Belikov, S., Belmont, R., Bennett, R., Berdnikov, A., Berdnikov, Y., Bhom, J. H., Bickley, A. A., Bjorndal, M. T., Blau, D. S., Boer, M., Boissevain, J. G., Bok, J. S., Borel, H., Boyle, K., Brooks, M. L., Brown, D. S., Bryslawskyj, J., Bucher, D., Buesching, H., Bumazhnov, V., Bunce, G., Burward-Hoy, J. M., Butsyk, S., Camacho, C. M., Campbell, S., Roman, V. Canoa, Caringi, A., Castera, P., Chai, J. -S., Chang, B. S., Chang, W. C., Charvet, J. -L., Chen, C. -H., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Choi, J. B., Choi, S., Choudhury, R. K., Christiansen, P., Chujo, T., Chung, P., Churyn, A., Chvala, O., Cianciolo, V., Citron, Z., Cleven, C. R., Cobigo, Y., Cole, B. A., Comets, M. P., del Valle, Z. Conesa, Connors, M., Constantin, P., Csanád, M., Csörgö, T., Dahms, T., Dairaku, S., Danchev, I., Danley, T. W., Das, K., Datta, A., Daugherity, M. S., David, G., Dayananda, M. K., Deaton, M. B., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dharmawardane, K. V., Dietzsch, O., Ding, L., Dion, A., Do, J. H., Donadelli, M., D'Orazio, L., Drachenberg, J. L., Drapier, O., Drees, A., Drees, K. A., Dubey, A. K., Durham, J. M., Durum, A., Dutta, D., Dzhordzhadze, V., Edwards, S., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Engelmore, T., Enokizono, A., En'yo, H., Espagnon, B., Esumi, S., Eyser, K. O., Fadem, B., Fan, W., Feege, N., Fields, D. E., Finger, M., Finger, Jr., M., Fleuret, F., Fokin, S. L., Forestier, B., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fung, S. -Y., Fusayasu, T., Gadrat, S., Gainey, K., Gal, C., Gallus, P., Garg, P., Garishvili, A., Garishvili, I., Gastineau, F., Ge, H., Germain, M., Glenn, A., Gong, H., Gong, X., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Grim, G., Perdekamp, M. Grosse, Gunji, T., Guo, L., Gustafsson, H. Å., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hagiwara, M. N., Hahn, K. I., Hamagaki, H., Hamblen, J., Han, R., Hanks, J., Harada, H., Hartouni, E. P., Haruna, K., Harvey, M., Hasegawa, S., Haseler, T. O. S., Hashimoto, K., Haslum, E., Hasuko, K., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Heuser, J. M., Hiejima, H., Hill, J. C., Hill, K., Hobbs, R., Hodges, A., Hohlmann, M., Hollis, R. S., Holmes, M., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hori, Y., Hornback, D., Hotvedt, N., Huang, J., Huang, S., Hur, M. G., Ichihara, T., Ichimiya, R., Iinuma, H., Ikeda, Y., Imai, K., Imrek, J., Inaba, M., Inoue, Y., Iordanova, A., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Ivanishchev, D., Iwanaga, Y., Jacak, B. V., Javani, M., Ji, Z., Jia, J., Jiang, X., Jin, J., Jinnouchi, O., Johnson, B. M., Jones, T., Joo, K. S., Jouan, D., Jumper, D. S., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kaneta, M., Kaneti, S., Kang, B. H., Kang, J. H., Kang, J. S., Kanou, H., Kapustinsky, J., Karatsu, K., Kasai, M., Kawagishi, T., Kawall, D., Kawashima, M., Kazantsev, A. V., Kelly, S., Kempel, T., Khachatryan, V., Khanzadeev, A., Kijima, K. M., Kikuchi, J., Kim, A., Kim, B. I., Kim, C., Kim, D. H., Kim, D. J., Kim, E., Kim, E. -J., Kim, H. J., Kim, K. -B., Kim, M., Kim, S. H., Kim, Y. -J., Kim, Y. K., Kim, Y. -S., Kincses, D., Kinney, E., Kiriluk, K., Kiss, Á., Kistenev, E., Kiyomichi, A., Klatsky, J., Klay, J., Klein-Boesing, C., Kleinjan, D., Kline, P., Kochenda, L., Kochetkov, V., Komatsu, Y., Komkov, B., Konno, M., Koster, J., Kotchetkov, D., Kotov, D., Kozlov, A., Král, A., Kravitz, A., Krizek, F., Kroon, P. J., Kubart, J., Kunde, G. J., Kurgyis, B., Kurihara, N., Kurita, K., Kurosawa, M., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Layton, D., Lebedev, A., Bornec, Y. Le, Leckey, S., Lee, B., Lee, D. M., Lee, J., Lee, K. B., Lee, K. S., Lee, M. K., Lee, S. H., Lee, S. R., Lee, T., Leitch, M. J., Leite, M. A. L., Leitgab, M., Lenzi, B., Leung, Y. H., Lewis, B., Lewis, N. A., Li, X., Li, X. H., Lichtenwalner, P., Liebing, P., Lim, H., Lim, S. H., Levy, L. A. Linden, Liška, T., Litvinenko, A., Liu, H., Liu, M. X., Lökös, S., Love, B., Lynch, D., Maguire, C. F., Majoros, T., Makdisi, Y. I., Makek, M., Malakhov, A., Malik, M. D., Manion, A., Manko, V. I., Mannel, E., Mao, Y., Mašek, L., Masui, H., Masumoto, S., Matathias, F., McCain, M. C., McCumber, M., McGaughey, P. L., McGlinchey, D., McKinney, C., Means, N., Mendoza, M., Meredith, B., Miake, Y., Mibe, T., Mignerey, A. C., Mihalik, D. E., Mikeš, P., Miki, K., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, D. K., Mishra, G. C., Mishra, M., Mitchell, J. T., Mitrovski, M., Mitsuka, G., Miyachi, Y., Miyasaka, S., Mohanty, A. K., Mohapatra, S., Moon, H. J., Moon, T., Morino, Y., Morreale, A., Morrison, D. P., Morrow, S. I., Moss, J. M., Motschwiller, S., Moukhanova, T. V., Mukhopadhyay, D., Murakami, T., Murata, J., Mwai, A., Nagae, T., Nagamiya, S., Nagashima, K., Nagata, Y., Nagle, J. L., Naglis, M., Nagy, M. I., Nakagawa, I., Nakamiya, Y., Nakamura, K. R., Nakamura, T., Nakano, K., Nam, S., Nattrass, C., Nederlof, A., Newby, J., Nguyen, M., Nihashi, M., Niida, T., Norman, B. E., Nouicer, R., Novák, T., Novitzky, N., Nyanin, A. S., Nystrand, J., Oakley, C., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Ojha, I. D., Oka, M., Okada, K., Omiwade, O. O., Onuki, Y., Koop, J. D. Orjuela, Osborn, J. D., Oskarsson, A., Otterlund, I., Ouchida, M., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, B. H., Park, I. H., Park, J., Park, S., Park, S. K., Park, W. J., Pate, S. F., Patel, L., Patel, M., Pei, H., Peng, J. -C., Peng, W., Pereira, H., Perepelitsa, D. V., Peresedov, V., Peressounko, D. Yu., PerezLara, C. E., Petti, R., Pinkenburg, C., Pisani, R. P., Proissl, M., Purschke, M. L., Purwar, A. K., Qu, H., Radzevich, P. V., Rak, J., Rakotozafindrabe, A., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Reynolds, D., Riabov, V., Riabov, Y., Richardson, E., Richford, D., Rinn, T., Roach, D., Roche, G., Rolnick, S. D., Romana, A., Rosati, M., Rosen, C. A., Rosendahl, S. S. E., Rosnet, P., Rowan, Z., Rukoyatkin, P., Runchey, J., Ružička, P., Rykov, V. L., Ryu, S. S., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakashita, K., Sakata, H., Sako, H., Samsonov, V., Sano, M., Sano, S., Sarsour, M., Sato, H. D., Sato, S., Sato, T., Sawada, S., Schmoll, B. K., Sedgwick, K., Seele, J., Seidl, R., Semenov, A. Yu., Semenov, V., Sen, A., Seto, R., Sharma, D., Shea, T. K., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shimomura, M., Shohjoh, T., Shoji, K., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, B. K., Singh, C. P., Singh, V., Skoby, M. J., Skutnik, S., Slunečka, M., Smith, W. C., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sukhanov, A., Sullivan, J. P., Sun, J., Sun, Z., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Takahara, A., Taketani, A., Tanabe, R., Tanaka, K. H., Tanaka, Y., Taneja, S., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tarján, P., Tennant, E., Themann, H., Thomas, D., Thomas, T. L., Tieulent, R., Todoroki, T., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Tomášek, M., Tomita, Y., Torii, H., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Tsuji, T., Tuli, S. K., Tydesjö, H., Tyurin, N., Ueda, Y., Ujvari, B., Vale, C., Valle, H., van Hecke, H. W., Vargyas, M., Vazquez-Zambrano, E., Veicht, A., Velkovska, J., Vértesi, R., Vinogradov, A. A., Virius, M., Vossen, A., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, D., Watanabe, K., Watanabe, Y., Watanabe, Y. S., Wei, F., Wei, R., Wessels, J., White, S. N., Willis, N., Winter, D., Wolin, S., Wong, C. P., Woody, C. L., Wright, R. M., Wysocki, M., Xia, B., Xie, W., Xu, C., Xu, Q., Yamaguchi, Y. L., Yamaura, K., Yang, R., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., Yoo, J. H., You, Z., Young, G. R., Younus, I., Yu, H., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zelenski, A., Zhang, C., Zharko, S., Zhou, S., Zimamyi, J., Zolin, L., and Zou, L.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

The PHENIX collaboration presents first measurements of low-momentum ($0.4$1\,GeV/$c$) direct-photon yield $dN_{\gamma}^{\rm dir}/d\eta$ is a smooth function of $dN_{\rm ch}/d\eta$ and can be well described as proportional to $(dN_{\rm ch}/d\eta)^\alpha$ with $\alpha{\approx}1.25$. This scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and the Large Hadron Collider, for centrality selected samples, as well as for different, $A$$+$$A$ collision systems. At a given beam energy the scaling also holds for high $p_T$ ($>5$\,GeV/$c$) but when results from different collision energies are compared, an additional $\sqrt{s_{_{NN}}}$-dependent multiplicative factor is needed to describe the integrated-direct-photon yield., Comment: 673 authors from 82 institutions, 10 pages, 4 figures. v2 is version accepted for publication in Physical Review Letters. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Published
2018
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32. Low-momentum direct photon measurement in Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=200$ GeV

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Al-Bataineh, H., Alexander, J., Alfred, M., Aoki, K., Aphecetche, L., Armendariz, R., Aronson, S. H., Asai, J., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Bagoly, A., Baksay, G., Baksay, L., Baldisseri, A., Barish, K. N., Barnes, P. D., Bassalleck, B., Bathe, S., Batsouli, S., Baublis, V., Bazilevsky, A., Belikov, S., Belmont, R., Bennett, R., Berdnikov, A., Berdnikov, Y., Bickley, A. A., Boer, M., Boissevain, J. G., Bok, J. S., Borel, H., Boyle, K., Brooks, M. L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Bunce, G., Butsyk, S., Campbell, S., Roman, V. Canoa, Chang, B. S., Charvet, J. -L., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Chujo, T., Chung, P., Churyn, A., Cianciolo, V., Cleven, C. R., Cole, B. A., Comets, M. P., Connors, M., Constantin, P., Csanád, M., Csörgő, T., Dahms, T., Danley, T. W., Das, K., David, G., Deaton, M. B., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dietzsch, O., Dion, A., Do, J. H., Donadelli, M., Drapier, O., Drees, A., Dubey, A. K., Durham, J. M., Durum, A., Dzhordzhadze, V., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Enokizono, A., En'yo, H., Esumi, S., Eyser, K. O., Fan, W., Feege, N., Fields, D. E., Finger, M., Finger, Jr., M., Fleuret, F., Fokin, S. L., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fusayasu, T., Gadrat, S., Gallus, P., Garg, P., Garishvili, I., Ge, H., Glenn, A., Gong, H., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Perdekamp, M. Grosse, Gunji, T., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hamagaki, H., Han, R., Harada, H., Hartouni, E. P., Haruna, K., Hasegawa, S., Haseler, T. O. S., Haslum, E., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Hiejima, H., Hill, J. C., Hill, K., Hobbs, R., Hodges, A., Hohlmann, M., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hornback, D., Hoshino, T., Hotvedt, N., Huang, J., Ichihara, T., Iinuma, H., Imai, K., Inaba, M., Inoue, Y., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Ivanishchev, D., Jacak, B. V., Ji, Z., Jia, J., Jin, J., Jinnouchi, O., Johnson, B. M., Joo, K. S., Jouan, D., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kaneta, M., Kang, J. H., Kanou, H., Kawall, D., Kazantsev, A. V., Khachatryan, V., Khanzadeev, A., Kikuchi, J., Kim, D. H., Kim, D. J., Kim, E., Kim, E. -J., Kim, M., Kincses, D., Kinney, E., Kiss, Á., Kistenev, E., Kiyomichi, A., Klay, J., Klein-Boesing, C., Kochenda, L., Kochetkov, V., Komkov, B., Konno, M., Kotchetkov, D., Kotov, D., Kozlov, A., Král, A., Kravitz, A., Kubart, J., Kunde, G. J., Kurihara, N., Kurita, K., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Lebedev, A., Lee, D. M., Lee, M. K., Lee, S. H., Lee, T., Leitch, M. J., Leite, M. A. L., Lenzi, B., Leung, Y. H., Lewis, N. A., Li, X., Lim, S. H., Liška, T., Litvinenko, A., Liu, M. X., Lökös, S., Love, B., Lynch, D., Maguire, C. F., Majoros, T., Makdisi, Y. I., Malakhov, A., Malik, M. D., Manko, V. I., Mao, Y., Mašek, L., Masui, H., Matathias, F., McCumber, M., McGaughey, P. L., McGlinchey, D., Miake, Y., Mignerey, A. C., Mihalik, D. E., Mikeš, P., Miki, K., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, M., Mitchell, J. T., Mitrovski, M., Mitsuka, G., Moon, T., Morreale, A., Morrison, D. P., Morrow, S. I., Moukhanova, T. V., Mukhopadhyay, D., Murata, J., Nagamiya, S., Nagashima, K., Nagata, Y., Nagle, J. L., Naglis, M., Nakagawa, I., Nakamiya, Y., Nakamura, T., Nakano, K., Newby, J., Nguyen, M., Norman, B. E., Nouicer, R., Novák, T., Novitzky, N., Nyanin, A. S., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Oka, M., Okada, K., Omiwade, O. O., Koop, J. D. Orjuela, Osborn, J. D., Oskarsson, A., Ouchida, M., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, J., Park, S., Park, W. J., Pate, S. F., Patel, M., Pei, H., Peng, J. -C., Peng, W., Pereira, H., Perepelitsa, D. V., Peresedov, V., Peressounko, D. Yu., PerezLara, C. E., Pinkenburg, C., Purschke, M. L., Purwar, A. K., Qu, H., Radzevich, P. V., Rak, J., Rakotozafindrabe, A., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Riabov, V., Riabov, Y., Richford, D., Rinn, T., Roche, G., Romana, A., Rosati, M., Rosendahl, S. S. E., Rosnet, P., Rowan, Z., Rukoyatkin, P., Runchey, J., Rykov, V. L., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakata, H., Sako, H., Samsonov, V., Sarsour, M., Sato, S., Sawada, S., Schmoll, B. K., Seele, J., Seidl, R., Semenov, V., Seto, R., Sharma, D., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shimomura, M., Shoji, K., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, C. P., Singh, V., Skoby, M. J., Skutnik, S., Slunečka, M., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sun, Z, Sun, Z., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Taketani, A., Tanaka, Y., Tanida, K., Tannenbaum, M. J., Taranenko, A., Tarján, P., Thomas, T. L., Tieulent, R., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Torii, H., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Ujvari, B., Vale, C., Valle, H., van Hecke, H. W., Velkovska, J., Vértesi, R., Vinogradov, A. A., Virius, M., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, Y., Wei, F., Wessels, J., White, S. N., Winter, D., Wong, C. P., Woody, C. L., Wysocki, M., Xie, W., Xu, C., Xu, Q., Yamaguchi, Y. L., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., Yoo, J. H., Young, G. R., Younus, I., Yu, H., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zhang, C., Zharko, S., Zhou, S., Zimamyi, J., Zolin, L., and Zou, L.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

We have measured direct photons for $p_T<5~$GeV/$c$ in minimum bias and 0\%--40\% most central events at midrapidity for Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=200$ GeV. The $e^{+}e^{-}$ contribution from quasi-real direct virtual photons has been determined as an excess over the known hadronic contributions in the $e^{+}e^{-}$ mass distribution. A clear enhancement of photons over the binary scaled $p$$+$$p$ fit is observed for $p_T<4$ GeV/$c$ in Cu$+$Cu data. The $p_T$ spectra are consistent with the Au$+$Au data covering a similar number of participants. The inverse slopes of the exponential fits to the excess after subtraction of the $p$$+$$p$ baseline are 285$\pm$53(stat)$\pm$57(syst)~MeV/$c$ and 333$\pm$72(stat)$\pm$45(syst)~MeV/$c$ for minimum bias and 0\%--40\% most central events, respectively. The rapidity density, $dN/dy$, of photons demonstrates the same power law as a function of $dN_{\rm ch}/d\eta$ observed in Au$+$Au at the same collision energy., Comment: 453 authors from 74 institutions, 12 pages, 8 figures, 2 tables. v3 is version accepted for publication in Physical Review C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Published
2018
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33. The Odyssey of Kaonic Atoms Studies at the DA\(\Phi \)NE Collider: From DEAR to SIDDHARTA-2

Author

Artibani, F., primary, Clozza, F., additional, Bazzi, M., additional, Capoccia, C., additional, Clozza, A., additional, De Paolis, L., additional, Dulski, K., additional, Guaraldo, C., additional, Iliescu, M., additional, Khreptak, A., additional, Manti, S., additional, Napolitano, F., additional, Vazquez Doce, O., additional, Scordo, A., additional, Sgaramella, F., additional, Sirghi, F., additional, Spallone, A., additional, Cargnelli, M., additional, Marton, J., additional, Tüchler, M., additional, Zmeskal, J., additional, Abbene, L., additional, Buttacavoli, A., additional, Principato, F., additional, Bosnar, D., additional, Friščić, I., additional, Bragadireanu, M., additional, Borghi, G., additional, Carminati, M., additional, Deda, G., additional, Fiorini, C., additional, Del Grande, R., additional, Iwasaki, M., additional, Moskal, P., additional, Niedźwiecki, S., additional, Silarski, M., additional, Skurzok, M., additional, Ohnishi, H., additional, Toho, K., additional, Sirghi, D., additional, Piscicchia, K., additional, and Curceanu, C.O., additional

Published
2024
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34. Performance of TOF-RPC for the BGOegg experiment

Author

Tomida, N., Tran, N., Niiyama, M., Ohnishi, H., and Muramatsu, N.

Subjects
Physics - Instrumentation and Detectors
Abstract

We constructed a new time-of-flight (TOF) detector consisting of resistive plate chambers (RPCs) to measure particle energy in the BGOegg experiment. The BGOegg-RPC has a unique feature which enables us to cover a large area with a small number of readout channels. For this purpose, we developed the RPC with a strip size of 2.5 cm $\times$ 100 cm. The BGOegg-RPC covers an area of 320 cm $\times$ 200 cm with only 256 channels of readout electronics. In case of large readout RPCs, an originated signal is distorted and dispersed during propagation. In addition, there happens a signal reflection at the end of the strip. Although we designed the BGOegg-RPC and front-end electronics with minimized signal reflection, a small reflection still remained, deteriorating the resulting time resolution. After establishing calibration and correction methods to improve the performance of the BGOegg-RPC, we obtained the time resolution of {\sigma}~60 ps around the central region of strips.

Published
2016
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35. Workshop on Physics with Neutral Kaon Beam at JLab (KL2016) Mini-Proceedings

Author

Albrow, M., Amaryan, M., Chudakov, E., Degtyarenko, P., Feijoo, A., Fernandez-Ramirez, C., Fernando, I. P., Filippi, A., Goity, J. L., Haberzettl, H., Jackson, B. C., Kamano, H., Keith, C., Kohl, M., Larin, I., Liang, Wei-Hong, Magas, V. K., Mai, M., Manley, D. M., Mathieu, V., Myhrer, F., Nakayama, K., Noumi, H., Oh, Y., Ohnishi, H., Oset, E., Pennington, M., Ramos, A., Richards, D., Santopinto, E., Schumacher, R., Szczepaniak, A., Taylor, S., Wojtsekhowski, B., Xie, Ju-Jun, Ziegler, V., and Zou, B.

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

The KL2016 Workshop is following the Letter of Intent LoI12-15-001 "Physics Opportunities with Secondary KL beam at JLab" submitted to PAC43 with the main focus on the physics of excited hyperons produced by the Kaon beam on unpolarized and polarized targets with GlueX setup in Hall D. Such studies will broaden a physics program of hadron spectroscopy extending it to the strange sector. The Workshop was organized to get a feedback from the community to strengthen physics motivation of the LoI and prepare a full proposal. Further details about the Workshop can be found on the web page of the conference: http://www.jlab.org/conferences/kl2016/index.html ., Comment: 238 pages, Editors: M. Amaryan, E. Chudakov, C. Meyer, M. Pennington, J. Ritman, and I. Strakovsky

Published
2016

36. Structure near $K^-$+$p$+$p$ threshold in the in-flight $^3$He$(K^-,\Lambda p)n$ reaction

Author

Collaboration, J-PARC E15, Sada, Y., Ajimura, S., Bazzi, M., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Faso, D., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Vidal, A. Romero, Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Wuenschek, B. K., Yamaga, T., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

To search for an S= -1 di-baryonic state which decays to $\Lambda p$, the $ {\rm{}^3He}(K^-,\Lambda p)n_{missing}$ reaction was studied at 1.0 GeV/$c$. Unobserved neutrons were kinematically identified from the missing mass $M_X$ of the $ {\rm{}^3He}(K^-,\Lambda p)X$ reaction in order to have a large acceptance for the $\Lambda pn$ final state. The observed $\Lambda p n$ events, distributed widely over the kinematically allowed region of the Dalitz plot, establish that the major component comes from a three nucleon absorption process. A concentration of events at a specific neutron kinetic energy was observed in a region of low momentum transfer to the $\Lambda p$. To account for the observed peak structure, the simplest S-wave pole was assumed to exist in the reaction channel, having Breit-Wigner form in energy and with a Gaussian form-factor. A minimum $\chi^2$ method was applied to deduce its mass $M_X\ =$ 2355 $ ^{+ 6}_{ - 8}$ (stat.) $ \pm 12$ (syst.) MeV/c$^2$, and decay-width $\Gamma_X\ = $ 110 $ ^{+ 19}_{ - 17}$ (stat.) $ \pm 27$ (syst.) MeV/c$^2$, respectively. The form factor parameter $Q_X \sim$ 400 MeV/$c$ implies that the range of interaction is about 0.5, Comment: 12pages, 8 figures

Published
2016
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37. Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., Al-Bataineh, H., Alexander, J., Alfred, M., Al-Ta'ani, H., Angerami, A., Aoki, K., Apadula, N., Aphecetche, L., Aramaki, Y., Armendariz, R., Aronson, S. H., Asai, J., Asano, H., Aschenauer, E. C., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Bai, M., Baksay, G., Baksay, L., Baldisseri, A., Bandara, N. S., Bannier, B., Barish, K. N., Barnes, P. D., Bassalleck, B., Basye, A. T., Bathe, S., Batsouli, S., Baublis, V., Baumann, C., Baumgart, S., Bazilevsky, A., Beaumier, M., Beckman, S., Belikov, S., Belmont, R., Bennett, R., Berdnikov, A., Berdnikov, Y., Bickley, A. A., Blau, D. S., Boissevain, J. G., Bok, J. S., Borel, H., Boyle, K., Brooks, M. L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Bunce, G., Butsyk, S., Camacho, C. M., Campbell, S., Castera, P., Chang, B. S., Charvet, J. -L., Chen, C. -H., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Choi, J. B., Choi, S., Choudhury, R. K., Christiansen, P., Chujo, T., Chung, P., Churyn, A., Chvala, O., Cianciolo, V., Citron, Z., Cleven, C. R., Cole, B. A., Comets, M. P., Connors, M., Constantin, P., Csanád, M., Csörgő, T., Dahms, T., Dairaku, S., Danchev, I., Danley, D., Das, K., Datta, A., Daugherity, M. S., David, G., Deaton, M. B., DeBlasio, K., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dharmawardane, K. V., Dietzsch, O., Ding, L., Dion, A., Diss, P. B., Do, J. H., Donadelli, M., D'Orazio, L., Drapier, O., Drees, A., Drees, K. A., Dubey, A. K., Durham, J. M., Durum, A., Dutta, D., Dzhordzhadze, V., Edwards, S., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Engelmore, T., Enokizono, A., En'yo, H., Esumi, S., Eyser, K. O., Fadem, B., Feege, N., Fields, D. E., Finger, M., Finger, Jr., M., Fleuret, F., Fokin, S. L., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fusayasu, T., Gadrat, S., Gainey, K., Gal, C., Gallus, P., Garg, P., Garishvili, A., Garishvili, I., Ge, H., Giordano, F., Glenn, A., Gong, H., Gong, X., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Perdekamp, M. Grosse, Gunji, T., Guo, L., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hahn, K. I., Hamagaki, H., Hamblen, J., Hamilton, H. F., Han, R., Han, S. Y., Hanks, J., Harada, H., Hartouni, E. P., Haruna, K., Hasegawa, S., Haseler, T. O. S., Hashimoto, K., Haslum, E., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Hiejima, H., Hill, J. C., Hobbs, R., Hohlmann, M., Hollis, R. S., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hori, Y., Hornback, D., Hoshino, T., Hotvedt, N., Huang, J., Huang, S., Ichihara, T., Ichimiya, R., Ide, J., Iinuma, H., Ikeda, Y., Imai, K., Imrek, J., Inaba, M., Inoue, Y., Iordanova, A., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Ivanishchev, D., Jacak, B. V., Javani, M., Jezghani, M., Jia, J., Jiang, X., Jin, J., Jinnouchi, O., Johnson, B. M., Joo, K. S., Jouan, D., Jumper, D. S., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kanda, S., Kaneta, M., Kaneti, S., Kang, B. H., Kang, J. H., Kang, J. S., Kanou, H., Kapustinsky, J., Karatsu, K., Kasai, M., Kawall, D., Kawashima, M., Kazantsev, A. V., Kempel, T., Key, J. A., Khachatryan, V., Khanzadeev, A., Kijima, K. M., Kikuchi, J., Kim, B. I., Kim, C., Kim, D. H., Kim, D. J., Kim, E., Kim, E. -J., Kim, G. W., Kim, H. J., Kim, K. -B., Kim, M., Kim, S. H., Kim, Y. -J., Kim, Y. K., Kimelman, B., Kinney, E., Kiriluk, K., Kiss, Á., Kistenev, E., Kitamura, R., Kiyomichi, A., Klatsky, J., Klay, J., Klein-Boesing, C., Kleinjan, D., Kline, P., Koblesky, T., Kochenda, L., Kochetkov, V., Komatsu, Y., Komkov, B., Konno, M., Koster, J., Kotchetkov, D., Kotov, D., Kozlov, A., Král, A., Kravitz, A., Krizek, F., Kubart, J., Kunde, G. J., Kurihara, N., Kurita, K., Kurosawa, M., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Lebedev, A., Lee, B., Lee, D. M., Lee, J., Lee, K., Lee, K. B., Lee, K. S., Lee, M. K., Lee, S, Lee, S. H., Lee, S. R., Lee, T., Leitch, M. J., Leite, M. A. L., Leitgab, M., Leitner, E., Lenzi, B., Lewis, B., Li, X., Liebing, P., Lim, S. H., Levy, L. A. Linden, Liška, T., Litvinenko, A., Liu, H., Liu, M. X., Love, B., Luechtenborg, R., Lynch, D., Maguire, C. F., Makdisi, Y. I., Makek, M., Malakhov, A., Malik, M. D., Manion, A., Manko, V. I., Mannel, E., Mao, Y., Mašek, L., Masui, H., Masumoto, S., Matathias, F., McCumber, M., McGaughey, P. L., McGlinchey, D., McKinney, C., Means, N., Meles, A., Mendoza, M., Meredith, B., Miake, Y., Mibe, T., Mignerey, A. C., Mikeš, P., Miki, K., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, D. K., Mishra, M., Mitchell, J. T., Mitrovski, M., Miyachi, Y., Miyasaka, S., Mizuno, S., Mohanty, A. K., Mohapatra, S., Montuenga, P., Moon, H. J., Moon, T., Morino, Y., Morreale, A., Morrison, D. P., Motschwiller, S., Moukhanova, T. V., Mukhopadhyay, D., Murakami, T., Murata, J., Mwai, A., Nagae, T., Nagamiya, S., Nagashima, K., Nagata, Y., Nagle, J. L., Naglis, M., Nagy, M. I., Nakagawa, I., Nakagomi, H., Nakamiya, Y., Nakamura, K. R., Nakamura, T., Nakano, K., Nattrass, C., Nederlof, A., Netrakanti, P. K., Newby, J., Nguyen, M., Nihashi, M., Niida, T., Nishimura, S., Norman, B. E., Nouicer, R., Novak, T., Novitzky, N., Nyanin, A. S., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Oka, M., Okada, K., Omiwade, O. O., Onuki, Y., Koop, J. D. Orjuela, Osborn, J. D., Oskarsson, A., Ouchida, M., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, B. H., Park, I. H., Park, J., Park, J. S., Park, S., Park, S. K., Park, W. J., Pate, S. F., Patel, L., Patel, M., Pei, H., Peng, J. -C., Pereira, H., Perepelitsa, D. V., Perera, G. D. N., Peresedov, V., Peressounko, D. Yu., Perry, J., Petti, R., Pinkenburg, C., Pinson, R., Pisani, R. P., Proissl, M., Purschke, M. L., Purwar, A. K., Qu, H., Rak, J., Rakotozafindrabe, A., Ramson, B. J., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Reynolds, D., Riabov, V., Riabov, Y., Richardson, E., Rinn, T., Roach, D., Roche, G., Rolnick, S. D., Romana, A., Rosati, M., Rosen, C. A., Rosendahl, S. S. E., Rosnet, P., Rowan, Z., Rubin, J. G., Rukoyatkin, P., Ružička, P., Rykov, V. L., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakashita, K., Sakata, H., Sako, H., Samsonov, V., Sano, M., Sano, S., Sarsour, M., Sato, S., Sato, T., Sawada, S., Schaefer, B., Schmoll, B. K., Sedgwick, K., Seele, J., Seidl, R., Semenov, A. Yu., Semenov, V., Sen, A., Seto, R., Sett, P., Sexton, A., Sharma, D., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shimomura, M., Shoji, K., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, B. K., Singh, C. P., Singh, V., Skutnik, S., Slunečka, M., Snowball, M., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Sparks, N. A., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sukhanov, A., Sumita, T., Sun, J., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Takahara, A., Taketani, A., Tanabe, R., Tanaka, Y., Taneja, S., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tarján, P., Tennant, E., Themann, H., Thomas, T. L., Tieulent, R., Timilsina, A., Todoroki, T., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Tomášek, M., Torii, H., Towell, C. L., Towell, R., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Tsuji, T., Vale, C., Valle, H., van Hecke, H. W., Vargyas, M., Vazquez-Zambrano, E., Veicht, A., Velkovska, J., Vértesi, R., Vinogradov, A. A., Virius, M., Vossen, A., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, D., Watanabe, K., Watanabe, Y., Watanabe, Y. S., Wei, F., Wei, R., Wessels, J., White, A. S., White, S. N., Winter, D., Wolin, S., Wood, J. P., Woody, C. L., Wright, R. M., Wysocki, M., Xia, B., Xie, W., Xue, L., Yalcin, S., Yamaguchi, Y. L., Yamaura, K., Yang, R., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., Yoo, J. H., Yoon, I., You, Z., Young, G. R., Younus, I., Yu, H., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zelenski, A., Zhang, C., Zhou, S., Zimamyi, J., Zolin, L., and Zou, L.

Subjects
Nuclear Experiment
Abstract

Measurements of the fractional momentum loss ($S_{\rm loss}\equiv{\delta}p_T/p_T$) of high-transverse-momentum-identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au$+$Au and Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=62.4$ and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb$+$Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{\rm loss}$ as a function of a number of variables: the number of participants, $N_{\rm part}$, the number of quark participants, $N_{\rm qp}$, the charged-particle density, $dN_{\rm ch}/d\eta$, and the Bjorken energy density times the equilibration time, $\varepsilon_{\rm Bj}\tau_{0}$. We find that the $p_T$ where $S_{\rm loss}$ has its maximum, varies both with centrality and collision energy. Above the maximum, $S_{\rm loss}$ tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{_{NN}}}$=200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{\rm loss}$ with $dN_{\rm ch}/d\eta$ and $\varepsilon_{\rm Bj}\tau_{0}$, lending insight on the physics of parton energy loss., Comment: 630 authors, 21 pages, 16 figures, 7 tables. v2 is version accepted by Phys. Rev. C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Published
2015
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38. Transverse energy production and charged-particle multiplicity at midrapidity in various systems from $\sqrt{s_{NN}}=7.7$ to 200 GeV

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., Al-Bataineh, H., Alexander, J., Alfred, M., Al-Jamel, A., Al-Ta'ani, H., Angerami, A., Aoki, K., Apadula, N., Aphecetche, L., Aramaki, Y., Armendariz, R., Aronson, S. H., Asai, J., Asano, H., Aschenauer, E. C., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Bai, M., Bai, X., Baksay, G., Baksay, L., Baldisseri, A., Bandara, N. S., Bannier, B., Barish, K. N., Barnes, P. D., Bassalleck, B., Basye, A. T., Bathe, S., Batsouli, S., Baublis, V., Bauer, F., Baumann, C., Baumgart, S., Bazilevsky, A., Beaumier, M., Beckman, S., Belikov, S., Belmont, R., Bennett, R., Berdnikov, A., Berdnikov, Y., Bhom, J. H., Bickley, A. A., Bjorndal, M. T., Black, D., Blau, D. S., Boissevain, J. G., Bok, J. S., Borel, H., Boyle, K., Brooks, M. L., Brown, D. S., Bryslawskyj, J., Bucher, D., Buesching, H., Bumazhnov, V., Bunce, G., Burward-Hoy, J. M., Butsyk, S., Campbell, S., Caringi, A., Castera, P., Chai, J. -S., Chang, B. S., Charvet, J. -L., Chen, C. -H., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Choi, J. B., Choi, S., Choudhury, R. K., Christiansen, P., Chujo, T., Chung, P., Churyn, A., Chvala, O., Cianciolo, V., Citron, Z., Cleven, C. R., Cobigo, Y., Cole, B. A., Comets, M. P., del Valle, Z. Conesa, Connors, M., Constantin, P., Cronin, N., Crossette, N., Csanád, M., Csörgő, T., Dahms, T., Dairaku, S., Danchev, I., Danley, D., Das, K., Datta, A., Daugherity, M. S., David, G., Dayananda, M. K., Deaton, M. B., DeBlasio, K., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dharmawardane, K. V., Dietzsch, O., Ding, L., Dion, A., Diss, P. B., Do, J. H., Donadelli, M., D'Orazio, L., Drachenberg, J. L., Drapier, O., Drees, A., Drees, K. A., Dubey, A. K., Durham, J. M., Durum, A., Dutta, D., Dzhordzhadze, V., Edwards, S., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Engelmore, T., Enokizono, A., En'yo, H., Espagnon, B., Esumi, S., Eyser, K. O., Fadem, B., Feege, N., Fields, D. E., Finger, M., Finger Jr., M., Fleuret, F., Fokin, S. L., Forestier, B., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fung, S. -Y., Fusayasu, T., Gadrat, S., Gainey, K., Gal, C., Gallus, P., Garg, P., Garishvili, A., Garishvili, I., Gastineau, F., Ge, H., Germain, M., Giordano, F., Glenn, A., Gong, H., Gong, X., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Grim, G., Perdekamp, M. Grosse, Gu, Y., Gunji, T., Guo, L., Guragain, H., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hagiwara, M. N., Hahn, K. I., Hamagaki, H., Hamblen, J., Hamilton, H. F., Han, R., Han, S. Y., Hanks, J., Harada, H., Hartouni, E. P., Haruna, K., Harvey, M., Hasegawa, S., Haseler, T. O. S., Hashimoto, K., Haslum, E., Hasuko, K., Hayano, R., Hayashi, S., He, X., Heffner, M., Hemmick, T. K., Hester, T., Heuser, J. M., Hiejima, H., Hill, J. C., Hobbs, R., Hohlmann, M., Hollis, R. S., Holmes, M., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hori, Y., Hornback, D., Hoshino, T., Hotvedt, N., Huang, J., Huang, S., Hur, M. G., Ichihara, T., Ichimiya, R., Iinuma, H., Ikeda, Y., Imai, K., Imazu, Y., Imrek, J., Inaba, M., Inoue, Y., Iordanova, A., Isenhower, D., Isenhower, L., Ishihara, M., Isinhue, A., Isobe, T., Issah, M., Isupov, A., Ivanishchev, D., Iwanaga, Y., Jacak, B. V., Javani, M., Jeon, S. J., Jezghani, M., Jia, J., Jiang, X., Jin, J., Jinnouchi, O., Johnson, B. M., Jones, T., Joo, K. S., Jouan, D., Jumper, D. S., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kanda, S., Kaneta, M., Kaneti, S., Kang, B. H., Kang, J. H., Kang, J. S., Kanou, H., Kapustinsky, J., Karatsu, K., Kasai, M., Kawagishi, T., Kawall, D., Kawashima, M., Kazantsev, A. V., Kelly, S., Kempel, T., Key, J. A., Khachatryan, V., Khandai, P. K., Khanzadeev, A., Kijima, K. M., Kikuchi, J., Kim, A., Kim, B. I., Kim, C., Kim, D. H., Kim, D. J., Kim, E., Kim, E. -J., Kim, G. W., Kim, H. J., Kim, K. -B., Kim, M., Kim, Y. -J., Kim, Y. K., Kim, Y. -S., Kimelman, B., Kinney, E., Kiss, Á., Kistenev, E., Kitamura, R., Kiyomichi, A., Klatsky, J., Klay, J., Klein-Boesing, C., Kleinjan, D., Kline, P., Koblesky, T., Kochenda, L., Kochetkov, V., Kofarago, M., Komatsu, Y., Komkov, B., Konno, M., Koster, J., Kotchetkov, D., Kotov, D., Kozlov, A., Král, A., Kravitz, A., Krizek, F., Kroon, P. J., Kubart, J., Kunde, G. J., Kurihara, N., Kurita, K., Kurosawa, M., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Lebedev, A., Bornec, Y. Le, Leckey, S., Lee, B., Lee, D. M., Lee, G. H., Lee, J., Lee, K. B., Lee, K. S., Lee, M. K., Lee, S, Lee, S. H., Lee, S. R., Lee, T., Leitch, M. J., Leite, M. A. L., Leitgab, M., Lenzi, B., Lewis, B., Li, X., Li, X. H., Lichtenwalner, P., Liebing, P., Lim, H., Lim, S. H., Levy, L. A. Linden, Liška, T., Litvinenko, A., Liu, H., Liu, M. X., Love, B., Lynch, D., Maguire, C. F., Makdisi, Y. I., Makek, M., Malakhov, A., Malik, M. D., Manion, A., Manko, V. I., Mannel, E., Mao, Y., Maruyama, T., Mašek, L., Masui, H., Masumoto, S., Matathias, F., McCain, M. C., McCumber, M., McGaughey, P. L., McGlinchey, D., McKinney, C., Means, N., Meles, A., Mendoza, M., Meredith, B., Miake, Y., Mibe, T., Midori, J., Mignerey, A. C., Mikeš, P., Miki, K., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, D. K., Mishra, G. C., Mishra, M., Mitchell, J. T., Mitrovski, M., Miyachi, Y., Miyasaka, S., Mizuno, S., Mohanty, A. K., Mohapatra, S., Montuenga, P., Moon, H. J., Moon, T., Morino, Y., Morreale, A., Morrison, D. P., Moskowitz, M., Moss, J. M., Motschwiller, S., Moukhanova, T. V., Mukhopadhyay, D., Murakami, T., Murata, J., Mwai, A., Nagae, T., Nagamiya, S., Nagashima, K., Nagata, Y., Nagle, J. L., Naglis, M., Nagy, M. I., Nakagawa, I., Nakagomi, H., Nakamiya, Y., Nakamura, K. R., Nakamura, T., Nakano, K., Nam, S., Nattrass, C., Nederlof, A., Netrakanti, P. K., Newby, J., Nguyen, M., Nihashi, M., Niida, T., Nishimura, S., Norman, B. E., Nouicer, R., Novak, T., Novitzky, N., Nukariya, A., Nyanin, A. S., Nystrand, J., Oakley, C., Obayashi, H., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Oide, H., Ojha, I. D., Oka, M., Okada, K., Omiwade, O. O., Onuki, Y., Koop, J. D. Orjuela, Osborn, J. D., Oskarsson, A., Otterlund, I., Ouchida, M., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, B. H., Park, I. H., Park, J., Park, J. S., Park, S., Park, S. K., Park, W. J., Pate, S. F., Patel, L., Patel, M., Pei, H., Peng, J. -C., Pereira, H., Perepelitsa, D. V., Perera, G. D. N., Peresedov, V., Peressounko, D. Yu., Perry, J., Petti, R., Pinkenburg, C., Pinson, R., Pisani, R. P., Proissl, M., Purschke, M. L., Purwar, A. K., Qu, H., Rak, J., Rakotozafindrabe, A., Ramson, B. J., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Reynolds, D., Riabov, V., Riabov, Y., Richardson, E., Rinn, T., Riveli, N., Roach, D., Roche, G., Rolnick, S. D., Romana, A., Rosati, M., Rosen, C. A., Rosendahl, S. S. E., Rosnet, P., Rowan, Z., Rubin, J. G., Rukoyatkin, P., Ružička, P., Rykov, V. L., Ryu, M. S., Ryu, S. S., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakashita, K., Sakata, H., Sako, H., Samsonov, V., Sano, M., Sano, S., Sarsour, M., Sato, H. D., Sato, S., Sato, T., Sawada, S., Schaefer, B., Schmoll, B. K., Sedgwick, K., Seele, J., Seidl, R., Sekiguchi, Y., Semenov, V., Sen, A., Seto, R., Sett, P., Sexton, A., Sharma, D., Shaver, A., Shea, T. K., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shimomura, M., Shohjoh, T., Shoji, K., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, B. K., Singh, C. P., Singh, V., Skolnik, M., Skutnik, S., Slunečka, M., Smith, W. C., Snowball, M., Solano, S., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Steinberg, P., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Stone, M. R., Sugitate, T., Suire, C., Sukhanov, A., Sullivan, J. P., Sumita, T., Sun, J., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Takahara, A., Taketani, A., Tanabe, R., Tanaka, K. H., Tanaka, Y., Taneja, S., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tarján, P., Tennant, E., Themann, H., Thomas, D., Thomas, T. L., Tieulent, R., Timilsina, A., Todoroki, T., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Tomášek, M., Torii, H., Towell, C. L., Towell, R., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Tsuji, T., Tuli, S. K., Tydesjö, H., Tyurin, N., Vale, C., Valle, H., van Hecke, H. W., Vargyas, M., Vazquez-Zambrano, E., Veicht, A., Velkovska, J., Vértesi, R., Vinogradov, A. A., Virius, M., Voas, B., Vossen, A., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, D., Watanabe, K., Watanabe, Y., Watanabe, Y. S., Wei, F., Wei, R., Wessels, J., Whitaker, S., White, A. S., White, S. N., Willis, N., Winter, D., Wolin, S., Woody, C. L., Wright, R. M., Wysocki, M., Xia, B., Xie, W., Xue, L., Yalcin, S., Yamaguchi, Y. L., Yamaura, K., Yang, R., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., Yoo, J. H., Yoon, I., You, Z., Young, G. R., Younus, I., Yu, H., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zelenski, A., Zhang, C., Zhou, S., Zimamyi, J., Zolin, L., and Zou, L.

Subjects
Nuclear Experiment
Abstract

Measurements of midrapidity charged particle multiplicity distributions, $dN_{\rm ch}/d\eta$, and midrapidity transverse-energy distributions, $dE_T/d\eta$, are presented for a variety of collision systems and energies. Included are distributions for Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$, 130, 62.4, 39, 27, 19.6, 14.5, and 7.7 GeV, Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=200$ and 62.4 GeV, Cu$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, U$+$U collisions at $\sqrt{s_{_{NN}}}=193$ GeV, $d$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, $^{3}$He$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, and $p$$+$$p$ collisions at $\sqrt{s_{_{NN}}}=200$ GeV. Centrality-dependent distributions at midrapidity are presented in terms of the number of nucleon participants, $N_{\rm part}$, and the number of constituent quark participants, $N_{q{\rm p}}$. For all $A$$+$$A$ collisions down to $\sqrt{s_{_{NN}}}=7.7$ GeV, it is observed that the midrapidity data are better described by scaling with $N_{q{\rm p}}$ than scaling with $N_{\rm part}$. Also presented are estimates of the Bjorken energy density, $\varepsilon_{\rm BJ}$, and the ratio of $dE_T/d\eta$ to $dN_{\rm ch}/d\eta$, the latter of which is seen to be constant as a function of centrality for all systems., Comment: 706 authors, 32 pages, 20 figures, 34 tables, 2004, 2005, 2008, 2010, 2011, and 2012 data. v2 is version accepted for publication in Phys. Rev. C

Published
2015
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39. Measurements of elliptic and triangular flow in high-multiplicity $^{3}$He$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., Al-Bataineh, H., Alexander, J., Alfred, M., Al-Ta'ani, H., Andrews, K. R., Angerami, A., Aoki, K., Apadula, N., Aphecetche, L., Appelt, E., Aramaki, Y., Armendariz, R., Aronson, S. H., Asai, J., Asano, H., Aschenauer, E. C., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Bai, M., Baksay, G., Baksay, L., Baldisseri, A., Bandara, N. S., Bannier, B., Barish, K. N., Barnes, P. D., Bassalleck, B., Basye, A. T., Bathe, S., Batsouli, S., Baublis, V., Baumann, C., Bazilevsky, A., Beaumier, M., Beckman, S., Belikov, S., Belmont, R., Ben-Benjamin, J., Bennett, R., Berdnikov, A., Berdnikov, Y., Bhom, J. H., Bickley, A. A., Blau, D. S., Boissevain, J. G., Bok, J. S., Borel, H., Boyle, K., Brooks, M. L., Broxmeyer, D., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Bunce, G., Butsyk, S., Camacho, C. M., Campbell, S., Caringi, A., Castera, P., Chang, B. S., Chang, W. C., Charvet, J. -L., Chen, C. -H., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Choi, J. B., Choudhury, R. K., Christiansen, P., Chujo, T., Chung, P., Churyn, A., Chvala, O., Cianciolo, V., Citron, Z., Cleven, C. R., Cole, B. A., Comets, M. P., del Valle, Z. Conesa, Connors, M., Constantin, P., Csanád, M., Csörgő, T., Dahms, T., Dairaku, S., Danchev, I., Danley, D., Das, K., Datta, A., Daugherity, M. S., David, G., Dayananda, M. K., Deaton, M. B., DeBlasio, K., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dharmawardane, K. V., Dietzsch, O., Dion, A., Diss, P. B., Do, J. H., Donadelli, M., D'Orazio, L., Drapier, O., Drees, A., Drees, K. A., Dubey, A. K., Durham, J. M., Durum, A., Dutta, D., Dzhordzhadze, V., Edwards, S., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Engelmore, T., Enokizono, A., En'yo, H., Esumi, S., Eyser, K. O., Fadem, B., Feege, N., Fields, D. E., Finger, M., Finger, Jr., M., Fleuret, F., Fokin, S. L., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fusayasu, T., Gadrat, S., Gal, C., Gallus, P., Garg, P., Garishvili, I., Ge, H., Giordano, F., Glenn, A., Gong, H., Gong, X., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Grim, G., Perdekamp, M. Grosse, Gu, Y., Gunji, T., Guo, L., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hahn, K. I., Hamagaki, H., Hamblen, J., Hamilton, H. F., Han, R., Han, S. Y., Hanks, J., Harada, H., Harper, C., Hartouni, E. P., Haruna, K., Hasegawa, S., Haseler, T. O. S., Hashimoto, K., Haslum, E., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Hiejima, H., Hill, J. C., Hobbs, R., Hohlmann, M., Hollis, R. S., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hori, Y., Hornback, D., Hoshino, T., Hotvedt, N., Huang, J., Huang, S., Ichihara, T., Ichimiya, R., Iinuma, H., Ikeda, Y., Imai, K., Imrek, J., Inaba, M., Inoue, Y., Iordanova, A., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Ivanishchev, D., Iwanaga, Y., Jacak, B. V., Jezghani, M., Jia, J., Jiang, X., Jin, J., Jinnouchi, O., John, D., Johnson, B. M., Jones, T., Joo, K. S., Jouan, D., Jumper, D. S., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kanda, S., Kaneta, M., Kaneti, S., Kang, B. H., Kang, J. H., Kang, J. S., Kanou, H., Kapustinsky, J., Karatsu, K., Kasai, M., Kawall, D., Kawashima, M., Kazantsev, A. V., Kempel, T., Key, J. A., Khachatryan, V., Khanzadeev, A., Kijima, K. M., Kikuchi, J., Kim, A., Kim, B. I., Kim, C., Kim, D. H., Kim, D. J., Kim, E., Kim, E. -J., Kim, G. W., Kim, M., Kim, S. H., Kim, Y. -J., Kim, Y. K., Kimelman, B., Kinney, E., Kiriluk, K., Kiss, Á., Kistenev, E., Kitamura, R., Kiyomichi, A., Klatsky, J., Klay, J., Klein-Boesing, C., Kleinjan, D., Kline, P., Koblesky, T., Kochenda, L., Kochetkov, V., Komkov, B., Konno, M., Koster, J., Kotchetkov, D., Kotov, D., Kozlov, A., Král, A., Kravitz, A., Kubart, J., Kunde, G. J., Kurihara, N., Kurita, K., Kurosawa, M., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Layton, D., Lebedev, A., Lee, D. M., Lee, J., Lee, K. B., Lee, K. S., Lee, M. K., Lee, S, Lee, S. H., Lee, S. R., Lee, T., Leitch, M. J., Leite, M. A. L., Lenzi, B., Li, X., Lichtenwalner, P., Liebing, P., Lim, S. H., Levy, L. A. Linden, Liška, T., Litvinenko, A., Liu, H., Liu, M. X., Love, B., Lynch, D., Maguire, C. F., Makdisi, Y. I., Makek, M., Malakhov, A., Malik, M. D., Manion, A., Manko, V. I., Mannel, E., Mao, Y., Mašek, L., Masui, H., Matathias, F., McCumber, M., McGaughey, P. L., McGlinchey, D., McKinney, C., Means, N., Meles, A., Mendoza, M., Meredith, B., Miake, Y., Mibe, T., Mignerey, A. C., Mikeš, P., Miki, K., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, D. K., Mishra, M., Mitchell, J. T., Mitrovski, M., Miyachi, Y., Miyasaka, S., Mizuno, S., Mohanty, A. K., Montuenga, P., Moon, H. J., Moon, T., Morino, Y., Morreale, A., Morrison, D. P., Motschwiller, S., Moukhanova, T. V., Mukhopadhyay, D., Murakami, T., Murata, J., Mwai, A., Nagamiya, S., Nagashima, K., Nagata, Y., Nagle, J. L., Naglis, M., Nagy, M. I., Nakagawa, I., Nakagomi, H., Nakamiya, Y., Nakamura, K. R., Nakamura, T., Nakano, K., Nam, S., Nattrass, C., Netrakanti, P. K., Newby, J., Nguyen, M., Nihashi, M., Niida, T., Nishimura, S., Norman, B. E., Nouicer, R., Novak, T., Novitzky, N., Nyanin, A. S., Oakley, C., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Oka, M., Okada, K., Omiwade, O. O., Onuki, Y., Koop, J. D. Orjuela, Osborn, J. D., Oskarsson, A., Ouchida, M., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, B. H., Park, I. H., Park, J., Park, J. S., Park, S., Park, S. K., Park, W. J., Pate, S. F., Patel, L., Patel, M., Pei, H., Peng, J. -C., Pereira, H., Perepelitsa, D. V., Perera, G. D. N., Peresedov, V., Peressounko, D. Yu., Perry, J., Petti, R., Pinkenburg, C., Pinson, R., Pisani, R. P., Proissl, M., Purschke, M. L., Purwar, A. K., Qu, H., Rak, J., Rakotozafindrabe, A., Ramson, B. J., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Reynolds, D., Riabov, V., Riabov, Y., Richardson, E., Rinn, T., Roach, D., Roche, G., Rolnick, S. D., Romana, A., Rosati, M., Rosen, C. A., Rosendahl, S. S. E., Rosnet, P., Rowan, Z., Rubin, J. G., Rukoyatkin, P., Ružička, P., Rykov, V. L., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakashita, K., Sakata, H., Sako, H., Samsonov, V., Sano, S., Sarsour, M., Sato, S., Sato, T., Savastio, M., Sawada, S., Schaefer, B., Schmoll, B. K., Sedgwick, K., Seele, J., Seidl, R., Semenov, A. Yu., Semenov, V., Sen, A., Seto, R., Sett, P., Sexton, A., Sharma, D., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shim, H. H., Shimomura, M., Shoji, K., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, B. K., Singh, C. P., Singh, V., Skutnik, S., Slunečka, M., Snowball, M., Sodre, T., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sukhanov, A., Sumita, T., Sun, J., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Takahara, A., Taketani, A., Tanabe, R., Tanaka, Y., Taneja, S., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tarján, P., Tennant, E., Themann, H., Thomas, D., Thomas, T. L., Tieulent, R., Timilsina, A., Todoroki, T., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Tomášek, M., Tomita, Y., Torii, H., Towell, C. L., Towell, R., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Utsunomiya, K., Vale, C., Valle, H., van Hecke, H. W., Vazquez-Zambrano, E., Veicht, A., Velkovska, J., Vértesi, R., Vinogradov, A. A., Virius, M., Vossen, A., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, D., Watanabe, K., Watanabe, Y., Watanabe, Y. S., Wei, F., Wei, R., Wessels, J., White, A. S., White, S. N., Winter, D., Woody, C. L., Wright, R. M., Wysocki, M., Xia, B., Xie, W., Xue, L., Yalcin, S., Yamaguchi, Y. L., Yamaura, K., Yang, R., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., Yoo, J. H., Yoo, J. S., Yoon, I., You, Z., Young, G. R., Younus, I., Yu, H., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zelenski, A., Zhang, C., Zhou, S., Zimamyi, J., Zolin, L., and Zou, L.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

We present the first measurement of elliptic ($v_2$) and triangular ($v_3$) flow in high-multiplicity $^{3}$He$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV. Two-particle correlations, where the particles have a large separation in pseudorapidity, are compared in $^{3}$He$+$Au and in $p$$+$$p$ collisions and indicate that collective effects dominate the second and third Fourier components for the correlations observed in the $^{3}$He$+$Au system. The collective behavior is quantified in terms of elliptic $v_2$ and triangular $v_3$ anisotropy coefficients measured with respect to their corresponding event planes. The $v_2$ values are comparable to those previously measured in $d$$+$Au collisions at the same nucleon-nucleon center-of-mass energy. Comparison with various theoretical predictions are made, including to models where the hot spots created by the impact of the three $^{3}$He nucleons on the Au nucleus expand hydrodynamically to generate the triangular flow. The agreement of these models with data may indicate the formation of low-viscosity quark-gluon plasma even in these small collision systems., Comment: 630 authors, 9 pages, 4 figures, 2 tables. v2 is the version accepted for publication by Physical Review Letters. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Published
2015
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40. Measurement of the strong interaction induced shift and width of the 1s state of kaonic deuterium at J-PARC

Author

Zmeskal, J., Sato, M., Ajimura, S., Bazzi, M., Beer, G., Berucci, C., Bhang, H., Bosnar, D., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Clozza, A., Curceanu, C., D'uffizi, A., Enomoto, S., Fabbietti, L., Faso, D., Fiorini, C., Fujioka, H., Ghio, F., Golser, R., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kawasaki, S., Lachner, J., Sandri, P. Levi, Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Moskal, P., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Pietreanu, D., Piscicchia, K., Lener, M. Poli, Vidal, A. Romero, Sada, Y., Sakaguchi, A., Sakuma, F., Sbardella, E., Scordo, A., Sekimoto, M., Shi, H., Silarski, M., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Toyoda, A., Tucakovic, I., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamaga, T., Yamazaki, T., and Zhang, Q.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

The antikaon-nucleon interaction close to threshold provides crucial information on the interplay between spontaneous and explicit chiral symmetry breaking in low-energy QCD. In this context the importance of kaonic deuterium X-ray spectroscopy has been well recognized, but no experimental results have yet been obtained due to the difficulty of the measurement. We propose to measure the shift and width of the kaonic deuterium 1s state with an accuracy of 60 eV and 140 eV respectively at J-PARC. These results together with the kaonic hydrogen data (KpX at KEK, DEAR and SIDDHARTA at DAFNE) will then permit the determination of values of both the isospin I=0 and I=1 antikaon-nucleon scattering lengths and will provide the most stringent constraints on the antikaon-nucleon interaction, promising a breakthrough. Refined Monte Carlo studies were performed, including the investigation of background suppression factors for the described setup. These studies have demonstrated the feasibility of determining the shift and width of the kaonic deuterium atom 1s state with the desired accuracy of 60 eV and 140 eV., Comment: 12 pages, 9 figures

Published
2015
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41. Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Al-Bataineh, H., Al-Jamel, A., Alexander, J., Aoki, K., Aphecetche, L., Armendariz, R., Aronson, S. H., Asai, J., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Baksay, G., Baksay, L., Baldisseri, A., Barish, K. N., Barnes, P. D., Bassalleck, B., Bathe, S., Batsouli, S., Baublis, V., Bauer, F., Bazilevsky, A., Belikov, S., Bennett, R., Berdnikov, Y., Bickley, A. A., Bjorndal, M. T., Boissevain, J. G., Borel, H., Boyle, K., Brooks, M. L., Brown, D. S., Bucher, D., Buesching, H., Bumazhnov, V., Bunce, G., Burward-Hoy, J. M., Butsyk, S., Campbell, S., Chai, J. -S., Chang, B. S., Charvet, J. -L., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Chujo, T., Chung, P., Churyn, A., Cianciolo, V., Cleven, C. R., Cobigo, Y., Cole, B. A., Comets, M. P., Constantin, P., Csanád, M., Csörgő, T., Dahms, T., Das, K., David, G., Deaton, M. B., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dietzsch, O., Dion, A., Donadelli, M., Drachenberg, J. L., Drapier, O., Drees, A., Dubey, A. K., Durum, A., Dzhordzhadze, V., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Enokizono, A., En'yo, H., Espagnon, B., Esumi, S., Eyser, K. O., Fields, D. E., Finger, M., Finger, Jr., M., Fleuret, F., Fokin, S. L., Forestier, B., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fung, S. -Y., Fusayasu, T., Gadrat, S., Garishvili, I., Gastineau, F., Germain, M., Glenn, A., Gong, H., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Perdekamp, M. Grosse, Gunji, T., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hagiwara, M. N., Hamagaki, H., Han, R., Harada, H., Hartouni, E. P., Haruna, K., Harvey, M., Haslum, E., Hasuko, K., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Heuser, J. M., Hiejima, H., Hill, J. C., Hobbs, R., Hohlmann, M., Holmes, M., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hornback, D., Huang, S., Hur, M. G., Ichihara, T., Iinuma, H., Imai, K., Inaba, M., Inoue, Y., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Jacak, B. V., Jia, J., Jin, J., Jinnouchi, O., Johnson, B. M., Joo, K. S., Jouan, D., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kaneta, M., Kang, J. H., Kanou, H., Kawagishi, T., Kawall, D., Kazantsev, A. V., Kelly, S., Khanzadeev, A., Kikuchi, J., Kim, D. H., Kim, D. J., Kim, E., Kim, Y. -S., Kinney, E., Kiss, Á., Kistenev, E., Kiyomichi, A., Klay, J., Klein-Boesing, C., Kochenda, L., Kochetkov, V., Komkov, B., Konno, M., Kotchetkov, D., Kozlov, A., Král, A., Kravitz, A., Kroon, P. J., Kubart, J., Kunde, G. J., Kurihara, N., Kurita, K., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Lebedev, A., Bornec, Y. Le, Leckey, S., Lee, D. M., Lee, M. K., Lee, T., Leitch, M. J., Leite, M. A. L., Lenzi, B., Li, X., Li, X. H., Lim, H., Liška, T., Litvinenko, A., Liu, M. X., Love, B., Lynch, D., Maguire, C. F., Makdisi, Y. I., Malakhov, A., Malik, M. D., Manko, V. I., Mao, Y., Mašek, L., Masui, H., Matathias, F., McCain, M. C., McCumber, M., McGaughey, P. L., Miake, Y., Mikeš, P., Miki, K., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, G. C., Mishra, M., Mitchell, J. T., Mitrovski, M., Morreale, A., Morrison, D. P., Moss, J. M., Moukhanova, T. V., Mukhopadhyay, D., Murata, J., Nagamiya, S., Nagata, Y., Nagle, J. L., Naglis, M., Nakagawa, I., Nakamiya, Y., Nakamura, T., Nakano, K., Newby, J., Nguyen, M., Norman, B. E., Nouicer, R., Nyanin, A. S., Nystrand, J., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Ojha, I. D., Oka, M., Okada, K., Omiwade, O. O., Oskarsson, A., Otterlund, I., Ouchida, M., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, J., Park, W. J., Pate, S. F., Pei, H., Peng, J. -C., Pereira, H., Peresedov, V., Peressounko, D. Yu., Pinkenburg, C., Pisani, R. P., Purschke, M. L., Purwar, A. K., Qu, H., Rak, J., Rakotozafindrabe, A., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Riabov, V., Riabov, Y., Roche, G., Romana, A., Rosati, M., Rosendahl, S. S. E., Rosnet, P., Rukoyatkin, P., Rykov, V. L., Ryu, S. S., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakata, H., Samsonov, V., Sato, H. D., Sato, S., Sawada, S., Seele, J., Seidl, R., Semenov, V., Seto, R., Sharma, D., Shea, T. K., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shimomura, M., Shohjoh, T., Shoji, K., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, C. P., Singh, V., Skutnik, S., Slunečka, M., Smith, W. C., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sullivan, J. P., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Taketani, A., Tanaka, K. H., Tanaka, Y., Tanida, K., Tannenbaum, M. J., Taranenko, A., Tarján, P., Thomas, T. L., Todoroki, T., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Torii, H., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Tuli, S. K., Tydesjö, H., Tyurin, N., Vale, C., Valle, H., van Hecke, H. W., Velkovska, J., Vértesi, R., Vinogradov, A. A., Virius, M., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, Y., Wessels, J., White, S. N., Willis, N., Winter, D., Woody, C. L., Wysocki, M., Xie, W., Yamaguchi, Y. L., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., Young, G. R., Younus, I., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zhang, C., Zhou, S., Zimányi, J., and Zolin, L.

Subjects
Nuclear Experiment
Abstract

We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au$+$Au and Cu$+$Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au$+$Au collisions at $\sqrt{s_{_{NN}}}$=200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu$+$Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au$+$Au and Cu$+$Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{\rm part}$. We observe that $v_2$ divided by eccentricity ($\varepsilon$) monotonically increases with $N_{\rm part}$ and scales as ${N_{\rm part}^{1/3}}$. The Cu$+$Cu data at 62.4 GeV falls below the other scaled $v_{2}$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy $KE_T=m_T-m$ between $0.1

Published
2014
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42. Beam-energy and system-size dependence of the space-time extent of the pion emission source produced in heavy ion collisions

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., Al-Bataineh, H., Al-Ta'ani, H., Alexander, J., Alfred, M., Angerami, A., Aoki, K., Apadula, N., Aphecetche, L., Aramaki, Y., Armendariz, R., Aronson, S. H., Asai, J., Asano, H., Aschenauer, E. C., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Bai, M., Baksay, G., Baksay, L., Baldisseri, A., Bandara, N. S., Bannier, B., Barish, K. N., Barnes, P. D., Bassalleck, B., Basye, A. T., Bathe, S., Batsouli, S., Baublis, V., Baumann, C., Baumgart, S., Bazilevsky, A., Beaumier, M., Beckman, S., Belikov, S., Belmont, R., Bennett, R., Berdnikov, A., Berdnikov, Y., Bickley, A. A., Bing, X., Black, D., Blau, D. S., Boissevain, J. G., Bok, J. S., Borel, H., Boyle, K., Brooks, M. L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Bunce, G., Butsyk, S., Camacho, C. M., Campbell, S., Castera, P., Chang, B. S., Charvet, J. -L., Chen, C. -H., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Choi, J. B., Choi, S., Choudhury, R. K., Christiansen, P., Chujo, T., Chung, P., Churyn, A., Chvala, O., Cianciolo, V., Citron, Z., Cleven, C. R., Cole, B. A., Comets, M. P., Connors, M., Constantin, P., Csanád, M., Csörgő, T., Dahms, T., Dairaku, S., Danchev, I., Das, K., Datta, A., Daugherity, M. S., David, G., Deaton, M. B., DeBlasio, K., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dharmawardane, K. V., Dietzsch, O., Ding, L., Dion, A., Do, J. H., Donadelli, M., Drapier, O., Drees, A., Drees, K. A., Dubey, A. K., Durham, J. M., Durum, A., Dutta, D., Dzhordzhadze, V., D'Orazio, L., Edwards, S., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Engelmore, T., Enokizono, A., En'yo, H., Esumi, S., Eyser, K. O., Fadem, B., Feege, N., Fields, D. E., Finger, M., Finger, Jr., M., Fleuret, F., Fokin, S. L., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fusayasu, T., Gadrat, S., Gainey, K., Gal, C., Gallus, P., Garg, P., Garishvili, A., Garishvili, I., Ge, H., Giordano, F., Glenn, A., Gong, H., Gong, X., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Perdekamp, M. Grosse, Gu, Y., Gunji, T., Guo, L., Guragain, H., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hahn, K. I., Hamagaki, H., Hamblen, J., Han, R., Han, S. Y., Hanks, J., Harada, H., Hartouni, E. P., Haruna, K., Hasegawa, S., Hashimoto, K., Haslum, E., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Hiejima, H., Hill, J. C., Hobbs, R., Hohlmann, M., Hollis, R. S., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hori, Y., Hornback, D., Hoshino, T., Huang, J., Huang, S., Ichihara, T., Ichimiya, R., Ide, J., Iinuma, H., Ikeda, Y., Imai, K., Imazu, Y., Imrek, J., Inaba, M., Inoue, Y., Iordanova, A., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Ivanischev, D., Ivanishchev, D., Jacak, B. V., Javani, M., Jeon, S. J., Jezghani, M., Jia, J., Jiang, X., Jin, J., Jinnouchi, O., Johnson, B. M., Joo, E., Joo, K. S., Jouan, D., Jumper, D. S., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kaneta, M., Kaneti, S., Kang, B. H., Kang, J. H., Kang, J. S., Kanou, H., Kapustinsky, J., Karatsu, K., Kasai, M., Kawall, D., Kawashima, M., Kazantsev, A. V., Kempel, T., Key, J. A., Khachatryan, V., Khanzadeev, A., Kihara, K., Kijima, K. M., Kikuchi, J., Kim, B. I., Kim, C., Kim, D. H., Kim, D. J., Kim, E., Kim, E. -J., Kim, H. -J., Kim, H. J., Kim, K. -B., Kim, M., Kim, S. H., Kim, Y. -J., Kim, Y. K., Kinney, E., Kiriluk, K., Kiss, Á., Kistenev, E., Kiyomichi, A., Klatsky, J., Klay, J., Klein-Boesing, C., Kleinjan, D., Kline, P., Koblesky, T., Kochenda, L., Kochetkov, V., Kofarago, M., Komatsu, Y., Komkov, B., Konno, M., Koster, J., Kotchetkov, D., Kotov, D., Kozlov, A., Král, A., Kravitz, A., Krizek, F., Kubart, J., Kunde, G. J., Kurihara, N., Kurita, K., Kurosawa, M., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Lebedev, A., Lee, B., Lee, D. M., Lee, J., Lee, K., Lee, K. B., Lee, K. S., Lee, M. K., Lee, S. H., Lee, S. R., Lee, T., Leitch, M. J., Leite, M. A. L., Leitgab, M., Leitner, E., Lenzi, B., Lewis, B., Li, X., Liebing, P., Lim, S. H., Levy, L. A. Linden, Liška, T., Litvinenko, A., Liu, H., Liu, M. X., Love, B., Luechtenborg, R., Lynch, D., Maguire, C. F., Makdisi, Y. I., Makek, M., Malakhov, A., Malik, M. D., Manion, A., Manko, V. I., Mannel, E., Mao, Y., Mašek, L., Masui, H., Masumoto, S., Matathias, F., McCumber, M., McGaughey, P. L., McGlinchey, D., McKinney, C., Means, N., Meles, A., Mendoza, M., Meredith, B., Miake, Y., Mibe, T., Mignerey, A. C., Mikeš, P., Miki, K., Miller, A. J., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, D. K., Mishra, M., Mitchell, J. T., Mitrovski, M., Miyachi, Y., Miyasaka, S., Mizuno, S., Mohanty, A. K., Montuenga, P., Moon, H. J., Moon, T., Morino, Y., Morreale, A., Morrison, D. P., Motschwiller, S., Moukhanova, T. V., Mukhopadhyay, D., Murakami, T., Murata, J., Mwai, A., Nagae, T., Nagamiya, S., Nagata, Y., Nagle, J. L., Naglis, M., Nagy, M. I., Nakagawa, I., Nakagomi, H., Nakamiya, Y., Nakamura, K. R., Nakamura, T., Nakano, K., Nattrass, C., Nederlof, A., Netrakanti, P. K., Newby, J., Nguyen, M., Nihashi, M., Niida, T., Norman, B. E., Nouicer, R., Novitzky, N., Nyanin, A. S., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Oka, M., Okada, K., Omiwade, O. O., Onuki, Y., Koop, J. D. Orjuela, Oskarsson, A., Ouchida, M., Ozaki, H., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, B. H., Park, I. H., Park, J., Park, S., Park, S. K., Park, W. J., Pate, S. F., Patel, L., Patel, M., Pei, H., Peng, J. -C., Pereira, H., Perepelitsa, D. V., Perera, G. D. N., Peresedov, V., Peressounko, D. Yu., Perry, J., Petti, R., Pinkenburg, C., Pinson, R., Pisani, R. P., Proissl, M., Purschke, M. L., Purwar, A. K., Qu, H., Rak, J., Rakotozafindrabe, A., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Reynolds, D., Riabov, V., Riabov, Y., Richardson, E., Riveli, N., Roach, D., Roche, G., Rolnick, S. D., Romana, A., Rosati, M., Rosen, C. A., Rosendahl, S. S. E., Rosnet, P., Rowan, Z., Rubin, J. G., Rukoyatkin, P., Ružička, P., Rykov, V. L., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakashita, K., Sakata, H., Sako, H., Samsonov, V., Sano, M., Sano, S., Sarsour, M., Sato, S., Sato, T., Sawada, S., Schaefer, B., Schmoll, B. K., Sedgwick, K., Seele, J., Seidl, R., Semenov, A. Yu., Semenov, V., Sen, A., Seto, R., Sett, P., Sexton, A., Sharma, D., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shimomura, M., Shoji, K., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, B. K., Singh, C. P., Singh, V., Skutnik, S., Slunečka, M., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Soumya, M., Sourikova, I. V., Sparks, N. A., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sukhanov, A., Sumita, T., Sun, J., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Takahara, A., Taketani, A., Tanabe, R., Tanaka, Y., Taneja, S., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tarján, P., Tennant, E., Themann, H., Thomas, T. L., Timilsina, A., Todoroki, T., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Tomášek, M., Torii, H., Towell, M., Towell, R., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Tsuji, T., Vale, C., Valle, H., van Hecke, H. W., Vargyas, M., Vazquez-Zambrano, E., Veicht, A., Velkovska, J., Vértesi, R., Vinogradov, A. A., Virius, M., Vossen, A., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, D., Watanabe, K., Watanabe, Y., Watanabe, Y. S., Wei, F., Wei, R., Wessels, J., Whitaker, S., White, S. N., Winter, D., Wolin, S., Wood, J. P., Woody, C. L., Wright, R. M., Wysocki, M., Xia, B., Xie, W., Xue, L., Yalcin, S., Yamaguchi, Y. L., Yamaura, K., Yang, R., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., Yoon, I., You, Z., Young, G. R., Younus, I., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zelenski, A., Zhang, C., Zhou, S., Zimányi, J., and Zolin, L.

Subjects
Nuclear Experiment
Abstract

Two-pion interferometry measurements are used to extract the Gaussian radii $R_{{\rm out}}$, $R_{{\rm side}}$, and $R_{{\rm long}}$, of the pion emission sources produced in Cu$+$Cu and Au$+$Au collisions at several beam collision energies $\sqrt{s_{_{NN}}}$ at PHENIX. The extracted radii, which are compared to recent STAR and ALICE data, show characteristic scaling patterns as a function of the initial transverse size $\bar{R}$ of the collision systems and the transverse mass $m_T$ of the emitted pion pairs, consistent with hydrodynamiclike expansion. Specific combinations of the three-dimensional radii that are sensitive to the medium expansion velocity and lifetime, and the pion emission time duration show nonmonotonic $\sqrt{s_{_{NN}}}$ dependencies. The nonmonotonic behaviors exhibited by these quantities point to a softening of the equation of state that may coincide with the critical end point in the phase diagram for nuclear matter., Comment: 622 authors, 8 pages, 5 figures, data from 2005, 2007, and 2010. Submitted to Phys. Rev. Lett. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Published
2014

43. Precise lifetime measurement of Λ4H hypernucleus using in-flight 4He(K−,π0)Λ4H reaction

Author

Akaishi, T., primary, Asano, H., additional, Chen, X., additional, Clozza, A., additional, Curceanu, C., additional, Del Grande, R., additional, Guaraldo, C., additional, Han, C., additional, Hashimoto, T., additional, Iliescu, M., additional, Inoue, K., additional, Ishimoto, S., additional, Itahashi, K., additional, Iwasaki, M., additional, Ma, Y., additional, Miliucci, M., additional, Murayama, R., additional, Noumi, H., additional, Ohnishi, H., additional, Okada, S., additional, Outa, H., additional, Piscicchia, K., additional, Sakaguchi, A., additional, Sakuma, F., additional, Sato, M., additional, Scordo, A., additional, Shirotori, K., additional, Sirghi, D., additional, Sirghi, F., additional, Suzuki, S., additional, Tanida, K., additional, Toda, T., additional, Tokuda, M., additional, Yamaga, T., additional, Yuan, X., additional, Zhang, P., additional, Zhang, Y., additional, and Zhang, H., additional

Published
2023
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44. Measurement of $K_S^0$ and $K^{*0}$ in $p$$+$$p$, $d$$+$Au, and Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=200$ GeV

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., Al-Bataineh, H., Alexander, J., Alfred, M., Angerami, A., Aoki, K., Apadula, N., Aphecetche, L., Aramaki, Y., Armendariz, R., Aronson, S. H., Asai, J., Asano, H., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Bai, M., Baksay, G., Baksay, L., Baldisseri, A., Bandara, N. S., Bannier, B., Barish, K. N., Barnes, P. D., Bassalleck, B., Basye, A. T., Bathe, S., Batsouli, S., Baublis, V., Baumann, C., Bazilevsky, A., Beaumier, M., Beckman, S., Belikov, S., Belmont, R., Bennett, R., Berdnikov, A., Berdnikov, Y., Bhom, J. H., Bickley, A. A., Black, D., Blau, D. S., Boissevain, J. G., Bok, J., Bok, J. S., Borel, H., Boyle, K., Brooks, M. L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Bunce, G., Butsyk, S., Campbell, S., Caringi, A., Chang, B. S., Charvet, J. -L., Chen, C. -H., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Choi, J. B., Choudhury, R. K., Christiansen, P., Chujo, T., Chung, P., Churyn, A., Chvala, O., Cianciolo, V., Citron, Z., Cleven, C. R., Cole, B. A., Comets, M. P., del Valle, Z. Conesa, Connors, M., Constantin, P., Csanád, M., Csörgő, T., Dahms, T., Dairaku, S., Danchev, I., Das, K., Datta, A., Daugherity, M. S., David, G., Dayananda, M. K., Deaton, M. B., DeBlasio, K., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dharmawardane, K. V., Dietzsch, O., Ding, L., Dion, A., Do, J. H., Donadelli, M., Drapier, O., Drees, A., Drees, K. A., Dubey, A. K., Durham, J. M., Durum, A., Dutta, D., Dzhordzhadze, V., D'Orazio, L., Edwards, S., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Engelmore, T., Enokizono, A., En'yo, H., Esumi, S., Eyser, K. O., Fadem, B., Feege, N., Fields, D. E., Finger, M., Finger, Jr., M., Fleuret, F., Fokin, S. L., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fusayasu, T., Gadrat, S., Gal, C., Gallus, P., Garg, P., Garishvili, I., Ge, H., Giordano, F., Glenn, A., Gong, H., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Grim, G., Perdekamp, M. Grosse, Gu, Y., Gunji, T., Guragain, H., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hahn, K. I., Hamagaki, H., Hamblen, J., Han, R., Han, S. Y., Hanks, J., Harada, H., Hartouni, E. P., Haruna, K., Hasegawa, S., Haslum, E., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Hiejima, H., Hill, J. C., Hobbs, R., Hohlmann, M., Hollis, R. S., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hornback, D., Hoshino, T., Huang, S., Ichihara, T., Ichimiya, R., Iinuma, H., Ikeda, Y., Imai, K., Imazu, Y., Inaba, M., Inoue, Y., Iordanova, A., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Ivanischev, D., Ivanishchev, D., Iwanaga, Y., Jacak, B. V., Jeon, S. J., Jezghani, M., Jia, J., Jiang, X., Jin, J., Jinnouchi, O., Johnson, B. M., Jones, T., Joo, E., Joo, K. S., Jouan, D., Jumper, D. S., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kaneta, M., Kang, J. H., Kang, J. S., Kanou, H., Kapustinsky, J., Karatsu, K., Kasai, M., Kawall, D., Kawashima, M., Kazantsev, A. V., Kempel, T., Key, J. A., Khachatryan, V., Khanzadeev, A., Kihara, K., Kijima, K. M., Kikuchi, J., Kim, A., Kim, B. I., Kim, C., Kim, D. H., Kim, D. J., Kim, E., Kim, E. -J., Kim, H. -J., Kim, M., Kim, Y. -J., Kim, Y. K., Kinney, E., Kiss, Á., Kistenev, E., Kiyomichi, A., Klatsky, J., Klay, J., Klein-Boesing, C., Kleinjan, D., Kline, P., Koblesky, T., Kochenda, L., Kochetkov, V., Kofarago, M., Komkov, B., Konno, M., Koster, J., Kotchetkov, D., Kotov, D., Kozlov, A., Král, A., Kravitz, A., Kubart, J., Kunde, G. J., Kurihara, N., Kurita, K., Kurosawa, M., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Lebedev, A., Lee, D. M., Lee, J., Lee, K. B., Lee, K. S., Lee, M. K., Lee, S. H., Lee, T., Leitch, M. J., Leite, M. A. L., Leitgab, M., Lenzi, B., Li, X., Lichtenwalner, P., Liebing, P., Lim, S. H., Levy, L. A. Linden, Liška, T., Litvinenko, A., Liu, H., Liu, M. X., Love, B., Lynch, D., Maguire, C. F., Makdisi, Y. I., Makek, M., Malakhov, A., Malik, M. D., Manion, A., Manko, V. I., Mannel, E., Mao, Y., Mašek, L., Masui, H., Matathias, F., McCumber, M., McGaughey, P. L., McGlinchey, D., McKinney, C., Means, N., Meles, A., Mendoza, M., Meredith, B., Miake, Y., Mibe, T., Mignerey, A. C., Mikeš, P., Miki, K., Miller, A. J., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, D. K., Mishra, M., Mitchell, J. T., Mitrovski, M., Miyasaka, S., Mizuno, S., Mohanty, A. K., Montuenga, P., Moon, H. J., Moon, T., Morino, Y., Morreale, A., Morrison, D. P., Moukhanova, T. V., Mukhopadhyay, D., Murakami, T., Murata, J., Mwai, A., Nagamiya, S., Nagata, Y., Nagle, J. L., Naglis, M., Nagy, M. I., Nakagawa, I., Nakagomi, H., Nakamiya, Y., Nakamura, K. R., Nakamura, T., Nakano, K., Nam, S., Nattrass, C., Netrakanti, P. K., Newby, J., Nguyen, M., Nihashi, M., Niida, T., Norman, B. E., Nouicer, R., Novitzky, N., Nyanin, A. S., Oakley, C., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Oka, M., Okada, K., Omiwade, O. O., Onuki, Y., Koop, J. D. Orjuela, Oskarsson, A., Ouchida, M., Ozaki, H., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, I. H., Park, J., Park, S., Park, S. K., Park, W. J., Pate, S. F., Patel, L., Patel, M., Pei, H., Peng, J. -C., Pereira, H., Perepelitsa, D. V., Perera, G. D. N., Peresedov, V., Peressounko, D. Yu., Perry, J., Petti, R., Pinkenburg, C., Pinson, R., Pisani, R. P., Proissl, M., Purschke, M. L., Purwar, A. K., Qu, H., Rak, J., Rakotozafindrabe, A., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Reynolds, D., Riabov, V., Riabov, Y., Richardson, E., Riveli, N., Roach, D., Roche, G., Rolnick, S. D., Romana, A., Rosati, M., Rosen, C. A., Rosendahl, S. S. E., Rosnet, P., Rowan, Z., Rubin, J. G., Rukoyatkin, P., Ružička, P., Rykov, V. L., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakashita, K., Sakata, H., Sako, H., Samsonov, V., Sano, S., Sarsour, M., Sato, S., Sato, T., Sawada, S., Schaefer, B., Schmoll, B. K., Sedgwick, K., Seele, J., Seidl, R., Semenov, V., Sen, A., Seto, R., Sett, P., Sexton, A., Sharma, D., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shimomura, M., Shoji, K., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, B. K., Singh, C. P., Singh, V., Skutnik, S., Slunečka, M., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sukhanov, A., Sumita, T., Sun, J., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Takahara, A., Taketani, A., Tanabe, R., Tanaka, Y., Taneja, S., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tarján, P., Themann, H., Thomas, D., Thomas, T. L., Timilsina, A., Todoroki, T., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Tomášek, M., Torii, H., Towell, M., Towell, R., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Vale, C., Valle, H., van Hecke, H. W., Vargyas, M., Vazquez-Zambrano, E., Veicht, A., Velkovska, J., Vértesi, R., Vinogradov, A. A., Virius, M., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, D., Watanabe, K., Watanabe, Y., Watanabe, Y. S., Wei, F., Wei, R., Wessels, J., Whitaker, S., White, S. N., Winter, D., Wolin, S., Woody, C. L., Wright, R. M., Wysocki, M., Xia, B., Xie, W., Xue, L., Yalcin, S., Yamaguchi, Y. L., Yamaura, K., Yang, R., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., Yoon, I., You, Z., Young, G. R., Younus, I., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zelenski, A., Zhang, C., Zhou, S., Zimányi, J., and Zolin, L.

Subjects
Nuclear Experiment
Abstract

The PHENIX experiment at the Relativistic Heavy Ion Collider has performed a systematic study of $K_S^0$ and $K^{*0}$ meson production at midrapidity in $p$$+$$p$, $d$$+$Au, and Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=200$ GeV. The $K_S^0$ and $K^{*0}$ mesons are reconstructed via their $K_S^0 \rightarrow \pi^0(\rightarrow \gamma\gamma)\pi^0(\rightarrow\gamma\gamma)$ and $K^{*0} \rightarrow K^{\pm}\pi^{\mp}$ decay modes, respectively. The measured transverse-momentum spectra are used to determine the nuclear modification factor of $K_S^0$ and $K^{*0}$ mesons in $d$$+$Au and Cu$+$Cu collisions at different centralities. In the $d$$+$Au collisions, the nuclear modification factor of $K_S^0$ and $K^{*0}$ mesons is almost constant as a function of transverse momentum and is consistent with unity showing that cold-nuclear-matter effects do not play a significant role in the measured kinematic range. In Cu$+$Cu collisions, within the uncertainties no nuclear modification is registered in peripheral collisions. In central collisions, both mesons show suppression relative to the expectations from the $p$$+$$p$ yield scaled by the number of binary nucleon-nucleon collisions in the Cu$+$Cu system. In the $p_T$ range 2--5 GeV/$c$, the strange mesons ($K_S^0$, $K^{*0}$) similarly to the $\phi$ meson with hidden strangeness, show an intermediate suppression between the more suppressed light quark mesons ($\pi^0$) and the nonsuppressed baryons ($p$, $\bar{p}$). At higher transverse momentum, $p_T>5$ GeV/$c$, production of all particles is similarly suppressed by a factor of $\approx$ 2., Comment: 590 authors, 22 pages, 14 figures, 5 tables. Submitted to Phys. Rev. C Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Published
2014
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45. Transverse-energy distributions at midrapidity in $p$$+$$p$, $d$$+$Au, and Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$--200~GeV and implications for particle-production models

Author

Adler, S. S., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Al-Jamel, A., Alexander, J., Aoki, K., Aphecetche, L., Armendariz, R., Aronson, S. H., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Baldisseri, A., Barish, K. N., Barnes, P. D., Bassalleck, B., Bathe, S., Batsouli, S., Baublis, V., Bauer, F., Bazilevsky, A., Belikov, S., Bennett, R., Berdnikov, Y., Bjorndal, M. T., Boissevain, J. G., Borel, H., Boyle, K., Brooks, M. L., Brown, D. S., Bruner, N., Bucher, D., Buesching, H., Bumazhnov, V., Bunce, G., Burward-Hoy, J. M., Butsyk, S., Camard, X., Campbell, S., Chai, J. -S., Chand, P., Chang, W. C., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Choudhury, R. K., Chujo, T., Cianciolo, V., Cleven, C. R., Cobigo, Y., Cole, B. A., Comets, M. P., Constantin, P., Csanád, M., Csörgő, T., Cussonneau, J. P., Dahms, T., Das, K., David, G., Deák, F., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Devismes, A., Dietzsch, O., Dion, A., Drachenberg, J. L., Drapier, O., Drees, A., Dubey, A. K., Durum, A., Dutta, D., Dzhordzhadze, V., Efremenko, Y. V., Egdemir, J., Enokizono, A., En'yo, H., Espagnon, B., Esumi, S., Fields, D. E., Finck, C., Fleuret, F., Fokin, S. L., Forestier, B., Fox, B. D., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fukao, Y., Fung, S. -Y., Gadrat, S., Gastineau, F., Germain, M., Glenn, A., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Perdekamp, M. Grosse, Gunji, T., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haggerty, J. S., Hagiwara, M. N., Hamagaki, H., Hansen, A. G., Harada, H., Hartouni, E. P., Haruna, K., Harvey, M., Haslum, E., Hasuko, K., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Heuser, J. M., Hidas, P., Hiejima, H., Hill, J. C., Hobbs, R., Holmes, M., Holzmann, W., Homma, K., Hong, B., Hoover, A., Horaguchi, T., Hur, M. G., Ichihara, T., Iinuma, H., Ikonnikov, V. V., Imai, K., Inaba, M., Inuzuka, M., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Jacak, B. V., Jia, J., Jin, J., Jinnouchi, O., Johnson, B. M., Johnson, S. C., Joo, K. S., Jouan, D., Kajihara, F., Kametani, S., Kamihara, N., Kaneta, M., Kang, J. H., Katou, K., Kawabata, T., Kawagishi, T., Kazantsev, A. V., Kelly, S., Khachaturov, B., Khanzadeev, A., Kikuchi, J., Kim, D. J., Kim, E., Kim, E. J., Kim, G. -B., Kim, H. J., Kim, Y. -S., Kinney, E., Kiss, Á., Kistenev, E., Kiyomichi, A., Klein-Boesing, C., Kobayashi, H., Kochenda, L., Kochetkov, V., Kohara, R., Komkov, B., Konno, M., Kotchetkov, D., Kozlov, A., Kroon, P. J., Kuberg, C. H., Kunde, G. J., Kurihara, N., Kurita, K., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lajoie, J. G., Lebedev, A., Bornec, Y. Le, Leckey, S., Lee, D. M., Lee, M. K., Leitch, M. J., Leite, M. A. L., Li, X. H., Lim, H., Litvinenko, A., Liu, M. X., Maguire, C. F., Makdisi, Y. I., Malakhov, A., Malik, M. D., Manko, V. I., Mao, Y., Martinez, G., Masui, H., Matathias, F., Matsumoto, T., McCain, M. C., McGaughey, P. L., Miake, Y., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, G. C., Mitchell, J. T., Mohanty, A. K., Morrison, D. P., Moss, J. M., Moukhanova, T. V., Mukhopadhyay, D., Muniruzzaman, M., Murata, J., Nagamiya, S., Nagata, Y., Nagle, J. L., Naglis, M., Nakamura, T., Newby, J., Nguyen, M., Norman, B. E., Nyanin, A. S., Nystrand, J., O'Brien, E., Ogilvie, C. A., Ohnishi, H., Ojha, I. D., Okada, K., Omiwade, O. O., Oskarsson, A., Otterlund, I., Oyama, K., Ozawa, K., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, J., Park, W. J., Pate, S. F., Pei, H., Penev, V., Peng, J. -C., Pereira, H., Peresedov, V., Peressounko, D. Yu., Pierson, A., Pinkenburg, C., Pisani, R. P., Purschke, M. L., Purwar, A. K., Qu, H., Qualls, J. M., Rak, J., Ravinovich, I., Read, K. F., Reuter, M., Reygers, K., Riabov, V., Riabov, Y., Roche, G., Romana, A., Rosati, M., Rosendahl, S. S. E., Rosnet, P., Rukoyatkin, P., Rykov, V. L., Ryu, S. S., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Samsonov, V., Sanfratello, L., Santo, R., Sato, H. D., Sato, S., Sawada, S., Schutz, Y., Semenov, V., Seto, R., Sharma, D., Shea, T. K., Shein, I., Shibata, T. -A., Shigaki, K., Shimomura, M., Shohjoh, T., Shoji, K., Sickles, A., Silva, C. L., Silvermyr, D., Sim, K. S., Singh, C. P., Singh, V., Skutnik, S., Smith, W. C., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sullivan, J. P., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Taketani, A., Tanaka, K. H., Tanaka, Y., Tanida, K., Tannenbaum, M. J., Taranenko, A., Tarján, P., Thomas, T. L., Togawa, M., Tojo, J., Torii, H., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Tuli, S. K., Tydesjö, H., Tyurin, N., Uam, T. J., Vale, C., Valle, H., van Hecke, H. W., Velkovska, J., Velkovsky, M., Vértesi, R., Veszprémi, V., Vinogradov, A. A., Volkov, M. A., Vznuzdaev, E., Wagner, M., Wang, X. R., Watanabe, Y., Wessels, J., White, S. N., Willis, N., Winter, D., Wohn, F. K., Woody, C. L., Wysocki, M., Xie, W., Yanovich, A., Yokkaichi, S., Young, G. R., Younus, I., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zhang, C., Zhou, S., Zimányi, J., Zolin, L., and Zong, X.

Subjects
Nuclear Experiment
Abstract

Measurements of the midrapidity transverse energy distribution, $d\Et/d\eta$, are presented for $p$$+$$p$, $d$$+$Au, and Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV and additionally for Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ and 130 GeV. The $d\Et/d\eta$ distributions are first compared with the number of nucleon participants $N_{\rm part}$, number of binary collisions $N_{\rm coll}$, and number of constituent-quark participants $N_{qp}$ calculated from a Glauber model based on the nuclear geometry. For Au$+$Au, $\mean{d\Et/d\eta}/N_{\rm part}$ increases with $N_{\rm part}$, while $\mean{d\Et/d\eta}/N_{qp}$ is approximately constant for all three energies. This indicates that the two component ansatz, $dE_{T}/d\eta \propto (1-x) N_{\rm part}/2 + x N_{\rm coll}$, which has been used to represent $E_T$ distributions, is simply a proxy for $N_{qp}$, and that the $N_{\rm coll}$ term does not represent a hard-scattering component in $E_T$ distributions. The $dE_{T}/d\eta$ distributions of Au$+$Au and $d$$+$Au are then calculated from the measured $p$$+$$p$ $E_T$ distribution using two models that both reproduce the Au$+$Au data. However, while the number-of-constituent-quark-participant model agrees well with the $d$$+$Au data, the additive-quark model does not., Comment: 391 authors, 24 pages, 19 figures, and 15 Tables. Submitted to Phys. Rev. C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are publicly available at http://www.phenix.bnl.gov/papers.html

Published
2013
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46. System-size dependence of open-heavy-flavor production in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$=200 GeV

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Al-Bataineh, H., Alexander, J., Aoki, K., Apadula, N., Aphecetche, L., Armendariz, R., Aronson, S. H., Asai, J., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Baksay, G., Baksay, L., Baldisseri, A., Barish, K. N., Barnes, P. D., Bassalleck, B., Bathe, S., Batsouli, S., Baublis, V., Baumgart, S., Bazilevsky, A., Belikov, S., Bennett, R., Berdnikov, Y., Bickley, A. A., Boissevain, J. G., Borel, H., Boyle, K., Brooks, M. L., Buesching, H., Bumazhnov, V., Bunce, G., Butsyk, S., Campbell, S., Chang, B. S., Charvet, J. -L., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Chujo, T., Chung, P., Churyn, A., Cianciolo, V., Cleven, C. R., Cole, B. A., Comets, M. P., Constantin, P., Csanád, M., Csörgő, T., Dahms, T., Das, K., David, G., Deaton, M. B., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dietzsch, O., Dion, A., Donadelli, M., Drapier, O., Drees, A., Dubey, A. K., Durham, J. M., Durum, A., Dzhordzhadze, V., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Enokizono, A., En'yo, H., Esumi, S., Eyser, K. O., Fields, D. E., Finger, M., Finger, Jr., M., Fleuret, F., Fokin, S. L., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fusayasu, T., Gadrat, S., Garishvili, I., Glenn, A., Gong, H., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Perdekamp, M. Grosse, Gunji, T., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hamagaki, H., Han, R., Harada, H., Hartouni, E. P., Haruna, K., Haslum, E., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Hiejima, H., Hill, J. C., Hobbs, R., Hohlmann, M., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hornback, D., Ichihara, T., Iinuma, H., Imai, K., Inaba, M., Inoue, Y., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Jacak, B. V., Jia, J., Jin, J., Jinnouchi, O., Johnson, B. M., Joo, K. S., Jouan, D., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kaneta, M., Kang, J. H., Kanou, H., Kawall, D., Kazantsev, A. V., Khanzadeev, A., Kikuchi, J., Kim, D. H., Kim, D. J., Kim, E., Kinney, E., Kiss, Á., Kistenev, E., Kiyomichi, A., Klay, J., Klein-Boesing, C., Kochenda, L., Kochetkov, V., Komkov, B., Konno, M., Kotchetkov, D., Kozlov, A., Král, A., Kravitz, A., Kubart, J., Kunde, G. J., Kurihara, N., Kurita, K., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Lebedev, A., Lee, D. M., Lee, M. K., Lee, T., Leitch, M. J., Leite, M. A. L., Lenzi, B., Li, X., Liška, T., Litvinenko, A., Liu, M. X., Love, B., Lynch, D., Maguire, C. F., Makdisi, Y. I., Malakhov, A., Malik, M. D., Manko, V. I., Mao, Y., Mašek, L., Masui, H., Matathias, F., McCumber, M., McGaughey, P. L., McGlinchey, D., Miake, Y., Mikeš, P., Miki, K., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, M., Mitchell, J. T., Mitrovski, M., Morreale, A., Morrison, D. P., Moukhanova, T. V., Mukhopadhyay, D., Murata, J., Nagamiya, S., Nagata, Y., Nagle, J. L., Naglis, M., Nakagawa, I., Nakamiya, Y., Nakamura, T., Nakano, K., Newby, J., Nguyen, M., Norman, B. E., Nouicer, R., Nyanin, A. S., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Oka, M., Okada, K., Omiwade, O. O., Oskarsson, A., Ouchida, M., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, J., Park, W. J., Pate, S. F., Pei, H., Peng, J. -C., Pereira, H., Peresedov, V., Peressounko, D. Yu., Pinkenburg, C., Purschke, M. L., Purwar, A. K., Qu, H., Rak, J., Rakotozafindrabe, A., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Riabov, V., Riabov, Y., Roche, G., Romana, A., Rosati, M., Rosendahl, S. S. E., Rosnet, P., Rukoyatkin, P., Rykov, V. L., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakata, H., Samsonov, V., Sato, S., Sawada, S., Seele, J., Seidl, R., Semenov, V., Seto, R., Sharma, D., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shimomura, M., Shoji, K., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, C. P., Singh, V., Skutnik, S., Slunečka, M., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Taketani, A., Tanaka, Y., Tanida, K., Tannenbaum, M. J., Taranenko, A., Tarján, P., Thomas, T. L., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Torii, H., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Vale, C., Valle, H., van Hecke, H. W., Velkovska, J., Vértesi, R., Vinogradov, A. A., Virius, M., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, Y., Wessels, J., White, S. N., Winter, D., Woody, C. L., Wysocki, M., Xie, W., Yamaguchi, Y. L., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., Young, G. R., Younus, I., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zhang, C., Zhou, S., Zimányi, J., and Zolin, L.

Subjects
Nuclear Experiment
Abstract

The PHENIX Collaboration at the Relativistic Heavy Ion Collider has measured open heavy flavor production in Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}$=200 GeV through the measurement of electrons at midrapidity that originate from semileptonic decays of charm and bottom hadrons. In peripheral Cu$+$Cu collisions an enhanced production of electrons is observed relative to $p$$+$$p$ collisions scaled by the number of binary collisions. In the transverse momentum range from 1 to 5 GeV/$c$ the nuclear modification factor is $R_{AA}$$\sim$1.4. As the system size increases to more central Cu$+$Cu collisions, the enhancement gradually disappears and turns into a suppression. For $p_T>3$ GeV/$c$, the suppression reaches $R_{AA}$$\sim$0.8 in the most central collisions. The $p_T$ and centrality dependence of $R_{AA}$ in Cu$+$Cu collisions agree quantitatively with $R_{AA}$ in $d+$Au and Au$+$Au collisions, if compared at similar number of participating nucleons $\langle N_{\rm part} \rangle$., Comment: 380 authors, 13 pages, 12 figures, 2 tables. Submitted to Phys. Rev. C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Published
2013
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47. Medium modification of jet fragmentation in Au+Au collisions at sqrt(s_NN)=200 GeV measured in direct photon-hadron correlations

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., Al-Bataineh, H., Al-Ta'ani, H., Alexander, J., Angerami, A., Aoki, K., Apadula, N., Aphecetche, L., Aramaki, Y., Armendariz, R., Aronson, S. H., Asai, J., Asano, H., Aschenauer, E. C., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Bai, M., Baksay, G., Baksay, L., Baldisseri, A., Bannier, B., Barish, K. N., Barnes, P. D., Bassalleck, B., Basye, A. T., Bathe, S., Batsouli, S., Baublis, V., Baumann, C., Baumgart, S., Bazilevsky, A., Belikov, S., Belmont, R., Bennett, R., Berdnikov, A., Berdnikov, Y., Bickley, A. A., Bing, X., Blau, D. S., Boissevain, J. G., Bok, J. S., Borel, H., Boyle, K., Brooks, M. L., Buesching, H., Bumazhnov, V., Bunce, G., Butsyk, S., Camacho, C. M., Campbell, S., Castera, P., Chang, B. S., Chang, W. C., Charvet, J. -L., Chen, C. -H., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Choi, J. B., Choi, S., Choudhury, R. K., Christiansen, P., Chujo, T., Chung, P., Churyn, A., Chvala, O., Cianciolo, V., Citron, Z., Cleven, C. R., Cole, B. A., Comets, M. P., Connors, M., Constantin, P., Csanád, M., Csörgő, T., Dahms, T., Dairaku, S., Danchev, I., Das, K., Datta, A., Daugherity, M. S., David, G., Deaton, M. B., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dharmawardane, K. V., Dietzsch, O., Ding, L., Dion, A., Donadelli, M., Drapier, O., Drees, A., Drees, K. A., Dubey, A. K., Durham, J. M., Durum, A., Dutta, D., Dzhordzhadze, V., D'Orazio, L., Edwards, S., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Engelmore, T., Enokizono, A., En'yo, H., Esumi, S., Eyser, K. O., Fadem, B., Fields, D. E., Finger, M., Finger, Jr., M., Fleuret, F., Fokin, S. L., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fusayasu, T., Gadrat, S., Gainey, K., Gal, C., Garishvili, A., Garishvili, I., Glenn, A., Gong, H., Gong, X., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Perdekamp, M. Grosse, Gunji, T., Guo, L., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hahn, K. I., Hamagaki, H., Hamblen, J., Han, R., Hanks, J., Harada, H., Hartouni, E. P., Haruna, K., Hashimoto, K., Haslum, E., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Hiejima, H., Hill, J. C., Hobbs, R., Hohlmann, M., Hollis, R. S., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hori, Y., Hornback, D., Huang, S., Ichihara, T., Ichimiya, R., Ide, J., Iinuma, H., Ikeda, Y., Imai, K., Imrek, J., Inaba, M., Inoue, Y., Iordanova, A., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Ivanischev, D., Jacak, B. V., Javani, M., Jia, J., Jiang, X., Jin, J., Jinnouchi, O., Johnson, B. M., Joo, K. S., Jouan, D., Jumper, D. S., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kaneta, M., Kaneti, S., Kang, B. H., Kang, J. H., Kang, J. S., Kanou, H., Kapustinsky, J., Karatsu, K., Kasai, M., Kawall, D., Kawashima, M., Kazantsev, A. V., Kempel, T., Khanzadeev, A., Kijima, K. M., Kikuchi, J., Kim, B. I., Kim, C., Kim, D. H., Kim, D. J., Kim, E., Kim, E. -J., Kim, H. J., Kim, K. -B., Kim, S. H., Kim, Y. -J., Kim, Y. J., Kim, Y. K., Kinney, E., Kiriluk, K., Kiss, Á., Kistenev, E., Kiyomichi, A., Klatsky, J., Klay, J., Klein-Boesing, C., Kleinjan, D., Kline, P., Kochenda, L., Kochetkov, V., Komatsu, Y., Komkov, B., Konno, M., Koster, J., Kotchetkov, D., Kotov, D., Kozlov, A., Král, A., Kravitz, A., Krizek, F., Kubart, J., Kunde, G. J., Kurihara, N., Kurita, K., Kurosawa, M., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Layton, D., Lebedev, A., Lee, B., Lee, D. M., Lee, J., Lee, K., Lee, K. B., Lee, K. S., Lee, M. K., Lee, S. H., Lee, S. R., Lee, T., Leitch, M. J., Leite, M. A. L., Leitgab, M., Leitner, E., Lenzi, B., Lewis, B., Li, X., Liebing, P., Lim, S. H., Levy, L. A. Linden, Liška, T., Litvinenko, A., Liu, H., Liu, M. X., Love, B., Luechtenborg, R., Lynch, D., Maguire, C. F., Makdisi, Y. I., Makek, M., Malakhov, A., Malik, M. D., Manion, A., Manko, V. I., Mannel, E., Mao, Y., Mašek, L., Masui, H., Masumoto, S., Matathias, F., McCumber, M., McGaughey, P. L., McGlinchey, D., McKinney, C., Means, N., Mendoza, M., Meredith, B., Miake, Y., Mibe, T., Mignerey, A. C., Mikeš, P., Miki, K., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, D. K., Mishra, M., Mitchell, J. T., Mitrovski, M., Miyachi, Y., Miyasaka, S., Mohanty, A. K., Moon, H. J., Morino, Y., Morreale, A., Morrison, D. P., Motschwiller, S., Moukhanova, T. V., Mukhopadhyay, D., Murakami, T., Murata, J., Nagae, T., Nagamiya, S., Nagata, Y., Nagle, J. L., Naglis, M., Nagy, M. I., Nakagawa, I., Nakamiya, Y., Nakamura, K. R., Nakamura, T., Nakano, K., Nattrass, C., Nederlof, A., Newby, J., Nguyen, M., Nihashi, M., Niita, T., Norman, B. E., Nouicer, R., Novitzky, N., Nyanin, A. S., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Oka, M., Okada, K., Omiwade, O. O., Onuki, Y., Oskarsson, A., Ouchida, M., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, B. H., Park, I. H., Park, J., Park, S. K., Park, W. J., Pate, S. F., Patel, L., Pei, H., Peng, J. -C., Pereira, H., Peresedov, V., Peressounko, D. Yu., Petti, R., Pinkenburg, C., Pisani, R. P., Proissl, M., Purschke, M. L., Purwar, A. K., Qu, H., Rak, J., Rakotozafindrabe, A., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Reynolds, R., Riabov, V., Riabov, Y., Richardson, E., Roach, D., Roche, G., Rolnick, S. D., Romana, A., Rosati, M., Rosen, C. A., Rosendahl, S. S. E., Rosnet, P., Rukoyatkin, P., Ružička, P., Rykov, V. L., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakashita, K., Sakata, H., Samsonov, V., Sano, M., Sano, S., Sarsour, M., Sato, S., Sato, T., Sawada, S., Sedgwick, K., Seele, J., Seidl, R., Semenov, A. Yu., Semenov, V., Sen, A., Seto, R., Sharma, D., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shimomura, M., Shoji, K., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, B. K., Singh, C. P., Singh, V., Skutnik, S., Slunečka, M., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Soumya, M., Sourikova, I. V., Sparks, N. A., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sukhanov, A., Sun, J., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Takahara, A., Taketani, A., Tanabe, R., Tanaka, Y., Taneja, S., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tarján, P., Tennant, E., Themann, H., Thomas, T. L., Todoroki, T., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Tomášek, M., Tomita, Y., Torii, H., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Tsuji, T., Vale, C., Valle, H., van Hecke, H. W., Vargyas, M., Vazquez-Zambrano, E., Veicht, A., Velkovska, J., Vértesi, R., Vinogradov, A. A., Virius, M., Vossen, A., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, D., Watanabe, K., Watanabe, Y., Watanabe, Y. S., Wei, F., Wei, R., Wessels, J., White, S. N., Winter, D., Wolin, S., Wood, J. P., Woody, C. L., Wright, R. M., Wysocki, M., Xie, W., Yamaguchi, Y. L., Yamaura, K., Yang, R., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., You, Z., Young, G. R., Younus, I., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zelenski, A., Zhang, C., Zhou, S., Zimányi, J., and Zolin, L.

Subjects
Nuclear Experiment
Abstract

The jet fragmentation function is measured with direct photon-hadron correlations in p+p and Au+Au collisions at sqrt(s_NN)=200 GeV. The p_T of the photon is an excellent approximation to the initial p_T of the jet and the ratio z_T=p_T^h/p_T^\gamma is used as a proxy for the jet fragmentation function. A statistical subtraction is used to extract the direct photon-hadron yields in Au+Au collisions while a photon isolation cut is applied in p+p. I_ AA, the ratio of jet fragment yield in Au+Au to that in p+p, indicates modification of the jet fragmentation function. Suppression, most likely due to energy loss in the medium, is seen at high z_T. The fragment yield at low z_T is enhanced at large angles. Such a trend is expected from redistribution of the lost energy into increased production of low-momentum particles., Comment: 562 authors, 70 insitutions, 8 pages, and 3 figures. Submitted to Phys. Rev. Lett. v2 has minor changes to improve clarity. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Published
2012
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48. Direct photon production in d+Au collisions at sqrt(s_NN)=200 GeV

Author

Adare, A., Adler, S. S., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Al-Bataineh, H., Al-Jamel, A., Alexander, J., Angerami, A., Aoki, K., Apadula, N., Aphecetche, L., Aramaki, Y., Armendariz, R., Aronson, S. H., Asai, J., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Bai, M., Baksay, G., Baksay, L., Baldisseri, A., Barish, K. N., Barnes, P. D., Bassalleck, B., Basye, A. T., Bathe, S., Batsouli, S., Baublis, V., Bauer, F., Baumann, C., Bazilevsky, A., Belikov, S., Belmont, R., Bennett, R., Berdnikov, A., Berdnikov, Y., Bhom, J. H., Bickley, A. A., Bjorndal, M. T., Blau, D. S., Boissevain, J. G., Bok, J. S., Borel, H., Boyle, K., Brooks, M. L., Brown, D. S., Bruner, N., Bucher, D., Buesching, H., Bumazhnov, V., Bunce, G., Burward-Hoy, J. M., Butsyk, S., Camacho, C. M., Camard, X., Campbell, S., Caringi, A., Chand, P., Chang, B. S., Chang, W. C., Charvet, J. -L., Chen, C. -H., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Choi, J. B., Choudhury, R. K., Christiansen, P., Chujo, T., Chung, P., Churyn, A., Chvala, O., Cianciolo, V., Citron, Z., Cobigo, Y., Cole, B. A., Comets, M. P., del Valle, Z. Conesa, Connors, M., Constantin, P., Csanád, M., Csörgő, T., Cussonneau, J. P., Dahms, T., Dairaku, S., Danchev, I., Das, K., Datta, A., David, G., Dayananda, M. K., Deák, F., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Devismes, A., Dharmawardane, K. V., Dietzsch, O., Dion, A., Donadelli, M., Drachenberg, J. L., Drapier, O., Drees, A., Drees, K. A., Dubey, A. K., Durham, J. M., Durum, A., Dutta, D., Dzhordzhadze, V., D'Orazio, L., Edwards, S., Efremenko, Y. V., Ellinghaus, F., Engelmore, T., Enokizono, A., En'yo, H., Espagnon, B., Esumi, S., Eyser, K. O., Fadem, B., Fields, D. E., Finck, C., Finger, M., Finger Jr, M., Fleuret, F., Fokin, S. L., Fox, B. D., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fung, S. -Y., Fusayasu, T., Gadrat, S., Garishvili, I., Germain, M., Glenn, A., Gong, H., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Grim, G., Perdekamp, M. Grosse, Gunji, T., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haggerty, J. S., Hahn, K. I., Hamagaki, H., Hamblen, J., Han, R., Hanks, J., Hansen, A. G., Hartouni, E. P., Haruna, K., Harvey, M., Haslum, E., Hasuko, K., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Heuser, J. M., Hidas, P., Hiejima, H., Hill, J. C., Hobbs, R., Hohlmann, M., Holzmann, W., Homma, K., Hong, B., Hoover, A., Horaguchi, T., Hornback, D., Huang, S., Ichihara, T., Ichimiya, R., Iinuma, H., Ikeda, Y., Ikonnikov, V. V., Imai, K., Imrek, J., Inaba, M., Inuzuka, M., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Ivanischev, D., Iwanaga, Y., Jacak, B. V., Jia, J., Jiang, X., Jin, J., Jinnouchi, O., Johnson, B. M., Johnson, S. C., Jones, T., Joo, K. S., Jouan, D., Jumper, D. S., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kaneta, M., Kang, J. H., Kapustinsky, J., Karatsu, K., Kasai, M., Katou, K., Kawabata, T., Kawall, D., Kawashima, M., Kazantsev, A. V., Kelly, S., Kempel, T., Khachaturov, B., Khanzadeev, A., Kijima, K. M., Kikuchi, J., Kim, A., Kim, B. I., Kim, D. H., Kim, D. J., Kim, E., Kim, E. -J., Kim, E. J., Kim, G. -B., Kim, H. J., Kim, S. H., Kim, Y. -J., Kinney, E., Kiriluk, K., Kiss, Á., Kistenev, E., Kiyomichi, A., Klay, J., Klein-Boesing, C., Kleinjan, D., Kobayashi, H., Kochenda, L., Kochetkov, V., Kohara, R., Komkov, B., Konno, M., Koster, J., Kotchetkov, D., Kozlov, A., Král, A., Kravitz, A., Kroon, P. J., Kuberg, C. H., Kunde, G. J., Kurita, K., Kurosawa, M., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Layton, D., Lebedev, A., Bornec, Y. Le, Leckey, S., Lee, D. M., Lee, J., Lee, K. B., Lee, K. S., Lee, T., Leitch, M. J., Leite, M. A. L., Lenzi, B., Li, X., Li, X. H., Lichtenwalner, P., Liebing, P., Lim, H., Levy, L. A. Linden, Liška, T., Litvinenko, A., Liu, H., Liu, M. X., Love, B., Lynch, D., Maguire, C. F., Makdisi, Y. I., Malakhov, A., Malik, M. D., Manko, V. I., Mannel, E., Mao, Y., Martinez, G., Mašek, L., Masui, H., Matathias, F., Matsumoto, T., McCain, M. C., McCumber, M., McGaughey, P. L., Means, N., Meredith, B., Miake, Y., Mibe, T., Mignerey, A. C., Mikeš, P., Miki, K., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, G. C., Mishra, M., Mitchell, J. T., Mohanty, A. K., Moon, H. J., Morino, Y., Morreale, A., Morrison, D. P., Moss, J. M., Moukhanova, T. V., Mukhopadhyay, D., Muniruzzaman, M., Murakami, T., Murata, J., Nagamiya, S., Nagle, J. L., Naglis, M., Nagy, M. I., Nakagawa, I., Nakamiya, Y., Nakamura, K. R., Nakamura, T., Nakano, K., Nam, S., Newby, J., Nguyen, M., Nihashi, M., Niita, T., Nouicer, R., Nyanin, A. S., Nystrand, J., Oakley, C., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Ojha, I. D., Oka, M., Okada, K., Onuki, Y., Oskarsson, A., Otterlund, I., Ouchida, M., Oyama, K., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, I. H., Park, J., Park, S. K., Park, W. J., Pate, S. F., Pei, H., Penev, V., Peng, J. -C., Pereira, H., Peresedov, V., Peressounko, D. Yu., Petti, R., Pierson, A., Pinkenburg, C., Pisani, R. P., Proissl, M., Purschke, M. L., Purwar, A. K., Qu, H., Qualls, J. M., Rak, J., Rakotozafindrabe, A., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Riabov, V., Riabov, Y., Richardson, E., Roach, D., Roche, G., Rolnick, S. D., Romana, A., Rosati, M., Rosen, C. A., Rosendahl, S. S. E., Rosnet, P., Rukoyatkin, P., Ružička, P., Rykov, V. L., Ryu, S. S., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakashita, K., Samsonov, V., Sanfratello, L., Sano, S., Santo, R., Sato, H. D., Sato, S., Sato, T., Sawada, S., Schutz, Y., Sedgwick, K., Seele, J., Seidl, R., Semenov, A. Yu., Semenov, V., Seto, R., Sharma, D., Shea, T. K., Shein, I., Shibata, T. -A., Shigaki, K., Shimomura, M., Shoji, K., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, B. K., Singh, C. P., Singh, V., Slunečka, M., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sukhanov, A., Sullivan, J. P., Sziklai, J., Takagi, S., Takagui, E. M., Taketani, A., Tanabe, R., Tanaka, K. H., Tanaka, Y., Taneja, S., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tarján, P., Themann, H., Thomas, D., Thomas, T. L., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Tomita, Y., Torii, H., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Tydesjö, H., Tyurin, N., Uam, T. J., Vale, C., Valle, H., van Hecke, H. W., Vazquez-Zambrano, E., Veicht, A., Velkovska, J., Velkovsky, M., Vértesi, R., Veszprémi, V., Vinogradov, A. A., Virius, M., Volkov, M. A., Vrba, V., Vznuzdaev, E., Wang, X. R., Watanabe, D., Watanabe, K., Watanabe, Y., Wei, F., Wei, R., Wessels, J., White, S. N., Willis, N., Winter, D., Wohn, F. K., Woody, C. L., Wright, R. M., Wysocki, M., Xie, W., Yamaguchi, Y. L., Yamaura, K., Yang, R., Yanovich, A., Ying, J., Yokkaichi, S., You, Z., Young, G. R., Younus, I., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zhang, C., Zhou, S., Zimányi, J., Zolin, L., and Zong, X.

Subjects
Nuclear Experiment
Abstract

Direct photons have been measured in sqrt(s_NN)=200 GeV d+Au collisions at midrapidity. A wide p_T range is covered by measurements of nearly-real virtual photons (1

Published
2012
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49. Measurement of Direct Photons in Au+Au Collisions at sqrt(s_NN) = 200 GeV

Author

Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Al-Jamel, A., Alexander, J., Aoki, K., Aphecetche, L., Armendariz, R., Aronson, S. H., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Baldisseri, A., Barish, K. N., Barnes, P. D., Bassalleck, B., Bathe, S., Batsouli, S., Baublis, V., Bauer, F., Bazilevsky, A., Belikov, S., Bennett, R., Berdnikov, Y., Bjorndal, M. T., Boissevain, J. G., Borel, H., Boyle, K., Brooks, M. L., Brown, D. S., Bucher, D., Buesching, H., Bumazhnov, V., Bunce, G., Burward-Hoy, J. M., Butsyk, S., Campbell, S., Chai, J. -S., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Chujo, T., Cianciolo, V., Cleven, C. R., Cobigo, Y., Cole, B. A., Comets, M. P., Connors, M., Constantin, P., Csanád, M., Csörgő, T., Dahms, T., Das, K., David, G., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dietzsch, O., Dion, A., Drachenberg, J. L., Drapier, O., Drees, A., Dubey, A. K., Durum, A., Dzhordzhadze, V., Efremenko, Y. V., Egdemir, J., Enokizono, A., En'yo, H., Espagnon, B., Esumi, S., Fields, D. E., Fleuret, F., Fokin, S. L., Forestier, B., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fukao, Y., Fung, S. -Y., Gadrat, S., Gastineau, F., Germain, M., Glenn, A., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Perdekamp, M. Grosse, Gunji, T., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haggerty, J. S., Hagiwara, M. N., Hamagaki, H., Harada, H., Hartouni, E. P., Haruna, K., Harvey, M., Haslum, E., Hasuko, K., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Heuser, J. M., Hiejima, H., Hill, J. C., Hobbs, R., Holmes, M., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hur, M. G., Ichihara, T., Iinuma, H., Imai, K., Imrek, J., Inaba, M., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Jacak, B. V., Jia, J., Jin, J., Jinnouchi, O., Johnson, B. M., Joo, K. S., Jouan, D., Kajihara, F., Kametani, S., Kamihara, N., Kaneta, M., Kang, J. H., Kawagishi, T., Kazantsev, A. V., Kelly, S., Khanzadeev, A., Kim, D. J., Kim, E., Kim, Y. -S., Kinney, E., Kiss, Á., Kistenev, E., Kiyomichi, A., Klein-Boesing, C., Kochenda, L., Kochetkov, V., Komkov, B., Konno, M., Kotchetkov, D., Kozlov, A., Kroon, P. J., Kunde, G. J., Kurihara, N., Kurita, K., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lajoie, J. G., Lebedev, A., Bornec, Y. Le, Leckey, S., Lee, D. M., Lee, M. K., Leitch, M. J., Leite, M. A. L., Li, X. H., Lim, H., Litvinenko, A., Liu, M. X., Maguire, C. F., Makdisi, Y. I., Malakhov, A., Malik, M. D., Manko, V. I., Masui, H., Matathias, F., McCain, M. C., McGaughey, P. L., Miake, Y., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, G. C., Mitchell, J. T., Morrison, D. P., Moss, J. M., Moukhanova, T. V., Mukhopadhyay, D., Murata, J., Nagamiya, S., Nagata, Y., Nagle, J. L., Naglis, M., Nakamura, T., Newby, J., Nguyen, M., Norman, B. E., Nyanin, A. S., Nystrand, J., O'Brien, E., Ogilvie, C. A., Ohnishi, H., Ojha, I. D., Okada, K., Omiwade, O. O., Oskarsson, A., Otterlund, I., Ozawa, K., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, J., Park, W. J., Pate, S. F., Pei, H., Peng, J. -C., Pereira, H., Peresedov, V., Peressounko, D. Yu., Pinkenburg, C., Pisani, R. P., Purschke, M. L., Purwar, A. K., Qu, H., Rak, J., Ravinovich, I., Read, K. F., Reuter, M., Reygers, K., Riabov, V., Riabov, Y., Roche, G., Romana, A., Rosati, M., Rosendahl, S. S. E., Rosnet, P., Rukoyatkin, P., Rykov, V. L., Ryu, S. S., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Samsonov, V., Sato, H. D., Sato, S., Sawada, S., Semenov, V., Seto, R., Sharma, D., Shea, T. K., Shein, I., Shibata, T. -A., Shigaki, K., Shimomura, M., Shohjoh, T., Shoji, K., Sickles, A., Silva, C. L., Silvermyr, D., Sim, K. S., Singh, C. P., Singh, V., Skutnik, S., Smith, W. C., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sullivan, J. P., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Taketani, A., Tanaka, K. H., Tanaka, Y., Tanida, K., Tannenbaum, M. J., Taranenko, A., Tarján, P., Thomas, T. L., Togawa, M., Tojo, J., Torii, H., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Tuli, S. K., Tydesjö, H., Tyurin, N., Vale, C., Valle, H., van Hecke, H. W., Velkovska, J., Vértesi, R., Vinogradov, A. A., Vznuzdaev, E., Wagner, M., Wang, X. R., Watanabe, Y., Wessels, J., White, S. N., Willis, N., Winter, D., Woody, C. L., Wysocki, M., Xie, W., Yanovich, A., Yokkaichi, S., Young, G. R., Younus, I., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zhang, C., Zimányi, J., and Zolin, L.

Subjects
Nuclear Experiment
Abstract

We report the measurement of direct photons at midrapidity in Au+Au collisions at sqrt{s_NN} = 200 GeV. The direct photon signal was extracted for the transverse-momentum range of 4 GeV/c < p_T < 22 GeV/c, using a statistical method to subtract decay photons from the inclusive-photon sample. The direct-photon nuclear-modification factor R_AA was calculated as a function of p_T for different Au+Au collision centralities using the measured p+p direct-photon spectrum and compared to theoretical predictions. R_AA was found to be consistent with unity for all centralities over the entire measured p_T range. Theoretical models that account for modifications of initial-direct-photon production due to modified-parton-distribution functions in Au and the different isospin composition of the nuclei, predict a modest change of R_AA from unity and are consistent with the data. Models with compensating effects of the quark-gluon plasma on high-energy photons, such as suppression of jet-fragmentation photons and induced-photon bremsstrahlung from partons traversing the medium, are also consistent with this measurement., Comment: PHENIX Collaboration, 346 authors, 8 pages, 4 figures, 1 table. Submitted to Phys. Rev. Lett. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Published
2012
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50. Nuclear-Modification Factor for Open-Heavy-Flavor Production at Forward Rapidity in Cu+Cu Collisions at sqrt(s_NN)=200 GeV

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Al-Bataineh, H., Alexander, J., Aoki, K., Aphecetche, L., Armendariz, R., Aronson, S. H., Asai, J., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Baksay, G., Baksay, L., Baldisseri, A., Barish, K. N., Barnes, P. D., Bassalleck, B., Bathe, S., Batsouli, S., Baublis, V., Bazilevsky, A., Belikov, S., Bennett, R., Berdnikov, Y., Bickley, A. A., Boissevain, J. G., Borel, H., Boyle, K., Brooks, M. L., Buesching, H., Bumazhnov, V., Bunce, G., Butsyk, S., Campbell, S., Chang, B. S., Charvet, J. -L., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Chujo, T., Chung, P., Churyn, A., Cianciolo, V., Cleven, C. R., Cole, B. A., Comets, M. P., Constantin, P., Csanád, M., Csörgő, T., Dahms, T., Das, K., David, G., Deaton, M. B., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dietzsch, O., Dion, A., Donadelli, M., Drapier, O., Drees, A., Dubey, A. K., Durum, A., Dzhordzhadze, V., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Enokizono, A., En'yo, H., Esumi, S., Eyser, K. O., Fields, D. E., Finger, M., Finger, Jr., M., Fleuret, F., Fokin, S. L., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fusayasu, T., Gadrat, S., Garishvili, I., Glenn, A., Gong, H., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Perdekamp, M. Grosse, Gunji, T., Gustafsson, H. -Å., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hamagaki, H., Han, R., Harada, H., Hartouni, E. P., Haruna, K., Haslum, E., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Hiejima, H., Hill, J. C., Hobbs, R., Hohlmann, M., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hornback, D., Ichihara, T., Iinuma, H., Imai, K., Inaba, M., Inoue, Y., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Jacak, B. V., Jia, J., Jin, J., Jinnouchi, O., Johnson, B. M., Joo, K. S., Jouan, D., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kaneta, M., Kang, J. H., Kanou, H., Kawall, D., Kazantsev, A. V., Khanzadeev, A., Kikuchi, J., Kim, D. H., Kim, D. J., Kim, E., Kinney, E., Kiss, Á., Kistenev, E., Kiyomichi, A., Klay, J., Klein-Boesing, C., Kochenda, L., Kochetkov, V., Komkov, B., Konno, M., Kotchetkov, D., Kozlov, A., Král, A., Kravitz, A., Kubart, J., Kunde, G. J., Kurihara, N., Kurita, K., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Lebedev, A., Lee, D. M., Lee, M. K., Lee, T., Leitch, M. J., Leite, M. A. L., Lenzi, B., Li, X., Liška, T., Litvinenko, A., Liu, M. X., Love, B., Lynch, D., Maguire, C. F., Makdisi, Y. I., Malakhov, A., Malik, M. D., Manko, V. I., Mao, Y., Mašek, L., Masui, H., Matathias, F., McCumber, M., McGaughey, P. L., Miake, Y., Mikeš, P., Miki, K., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, M., Mitchell, J. T., Mitrovski, M., Morreale, A., Morrison, D. P., Moukhanova, T. V., Mukhopadhyay, D., Murata, J., Nagamiya, S., Nagata, Y., Nagle, J. L., Naglis, M., Nakagawa, I., Nakamiya, Y., Nakamura, T., Nakano, K., Newby, J., Nguyen, M., Norman, B. E., Nouicer, R., Nyanin, A. S., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Oka, M., Okada, K., Omiwade, O. O., Oskarsson, A., Ouchida, M., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, J., Park, W. J., Pate, S. F., Pei, H., Peng, J. -C., Pereira, H., Peresedov, V., Peressounko, D. Yu., Pinkenburg, C., Purschke, M. L., Purwar, A. K., Qu, H., Rak, J., Rakotozafindrabe, A., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Riabov, V., Riabov, Y., Roche, G., Romana, A., Rosati, M., Rosendahl, S. S. E., Rosnet, P., Rukoyatkin, P., Rykov, V. L., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakata, H., Samsonov, V., Sato, S., Sawada, S., Seele, J., Seidl, R., Semenov, V., Seto, R., Sharma, D., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shimomura, M., Shoji, K., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, C. P., Singh, V., Skutnik, S., Slunečka, M., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Taketani, A., Tanaka, Y., Tanida, K., Tannenbaum, M. J., Taranenko, A., Tarján, P., Thomas, T. L., Togawa, M., Toia, A., Tojo, J., Tomášek, L., Torii, H., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Vale, C., Valle, H., van Hecke, H. W., Velkovska, J., Vértesi, R., Vinogradov, A. A., Virius, M., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, Y., Wessels, J., White, S. N., Winter, D., Woody, C. L., Wysocki, M., Xie, W., Yamaguchi, Y. L., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., Young, G. R., Younus, I., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zhang, C., Zhou, S., Zimányi, J., and Zolin, L.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Background: Heavy-flavor production in p+p collisions tests perturbative-quantum-chromodynamics (pQCD) calculations. Modification of heavy-flavor production in heavy-ion collisions relative to binary-collision scaling from p+p results, quantified with the nuclear-modification factor (R_AA), provides information on both cold- and hot-nuclear-matter effects. Purpose: Determine transverse-momentum, pt, spectra and the corresponding R_AA for muons from heavy-flavor mesons decay in p+p and Cu+Cu collisions at sqrt(s_NN)=200 GeV and y=1.65. Method: Results are obtained using the semi-leptonic decay of heavy-flavor mesons into negative muons. The PHENIX muon-arm spectrometers measure the p_T spectra of inclusive muon candidates. Backgrounds, primarily due to light hadrons, are determined with a Monte-Carlo calculation using a set of input hadron distributions tuned to match measured-hadron distributions in the same detector and statistically subtracted. Results: The charm-production cross section in p+p collisions at sqrt{s}=200 GeV, integrated over pt and in the rapidity range 1.4

Published
2012
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