المؤلفون: Aryshev, Alexander, Behnke, Ties, Berggren, Mikael, Brau, James, Craig, Nathaniel, Freitas, Ayres, Gaede, Frank, Gessner, Spencer, Gori, Stefania, Grojean, Christophe, Heinemeyer, Sven, Jeans, Daniel, Kruger, Katja, List, Benno, List, Jenny, Liu, Zhen, Michizono, Shinichiro, Miller, David W., Moult, Ian, Murayama, Hitoshi, Nakada, Tatsuya, Nanni, Emilio, Nojiri, Mihoko, Padamsee, Hasan, Perelstein, Maxim, Peskin, Michael E., Poeschl, Roman, Posen, Sam, Robson, Aidan, Strube, Jan, Suehara, Taikan, Tian, Junping, Titov, Maxim, Vos, Marcel, White, Andrew, Wilson, Graham, Yokoya, Kaoru, Zarnecki, Aleksander Filip, Adachi, Ichiro, Agashe, Kaustubh, Jovin, Tatjana Agatonovic, Aihara, Hiroaki, Altmannshofer, Wolfgang, Alves, Daniele, Anguiano, Justin, Aoki, Ken-Ichi, Aoki, Masato, Aoki, Toshihiro, Aoki, Yumi, Arai, Yasuo, Araki, Hayato, Asada, Haruka, Asai, Kento, Asai, Shoji, Attie, David, Baer, Howard, Bagger, Jonathan, Bai, Yang, Bailey, Ian, Barrue, Ricardo, Bartoldus, Rainer, Barzi, Emanuela, Basso, Matthew, Bauerdick, Lothar, Baum, Sebastian, Bellerive, Alain, Belomestnykh, Sergey, Antequera, Jorge Berenguer, Beyer, Jakob, Bhat, Pushpalatha, Bilki, Burak, Black, Kevin, Bloom, Kenneth, Bodwin, Geoffrey, Boisvert, Veronique, Boran, Fatma, Boudry, Vincent, Boughezal, Radja, Boveia, Antonio, Bozovic-Jelisavcic, Ivanka, Brient, Jean-Claude, Brodsky, Stanley, Brunetti, Laurent, Buesser, Karsten, Bulyak, Eugene, Burrows, Philip N., Burt, Graeme C., Cai, Yunhai, Cairo, Valentina, Canepa, Anadi, Celiberto, Francesco Giovanni, Cenni, Enrico, Chacko, Zackaria, Chaikovska, Iryna, Checchin, Mattia, Chen, Lisong, Chen, Thomas Y., Cheng, Hsin Chia, Cho, Gi-Chol, Choudhary, Brajesh, Clarke, Jim, Cline, James, Co, Raymond, Cohen, Timothy, Colas, Paul, Damerell, Chris, Das, Arindam, Dasu, Sridhara, Dawson, Sally, de Blas, Jorge, de Lima, Carlos Henrique, Deandrea, Aldo, Dehmelt, Klaus, Delayen, Jean, Demarteau, Marcel, Denisov, Dmitri, Dermisek, Radovan, Dieguez, Angel, Dohmae, Takeshi, Dopke, Jens, Dort, Katharina, Du, Yong, Dudar, Bohdan, Dutta, Bhaskar, Dutta, Juhi, Einhaus, Ulrich, Elsen, Eckhard, Endo, Motoi, Eremeev, Grigory, Eren, Engin, Erler, Jens, Esarey, Eric, Everett, Lisa, Golfe, Angeles Faus, Garcia, Marcos Fernandez, Foster, Brian, Fourches, Nicolas, Fouz, Mary-Cruz, Fujii, Keisuke, Fujimoto, Junpei, Torregrosa, Esteban Fullan, Furukawa, Kazuro, Fusayasu, Takahiro, Fuster, Juan, Ganjour, Serguei, Gao, Yuanning, Gaur, Naveen, Geng, Rongli, Georgi, Howard, Gherghetta, Tony, Goldstein, Joel, Goncalves, Dorival, Gonski, Julia, Gonzalo, Tomas, Goto, Takeyoshi, Goto, Toru, Graf, Norman, Grames, Joseph, Grannis, Paul, Gray, Lindsey, Grohsjean, Alexander, Gu, Jiayin, Guler, Yalcin, Gutierrez, Phillip, Haba, Junji, Haber, Howard, Hallford, John, Hamaguchi, Koichi, Han, Tao, Hara, Kazuhiko, Harada, Daisuke, Hashimoto, Koji, Hashino, Katsuya, Hayashi, Masahito, Heinrich, Gudrun, Hidaka, Keisho, Higuchi, Takeo, Hinode, Fujio, Hioki, Zenro, Hirose, Minoru, Hiroshima, Nagisa, Hisano, Junji, Hollik, Wolfgang, Homiller, Samuel, Hong, Sungwoo, Hook, Anson, Horii, Yasuyuki, Hoshina, Hiroki, Hristova, Ivana, Huitu, Katri, Hyakutake, Yoshifumi, Iijima, Toru, Ikematsu, Katsumasa, Ilderton, Anton, Inami, Kenji, Irles, Adrian, Ishikawa, Akimasa, Ishiwata, Koji, Ito, Hayato, Ivanov, Igor, Iwamoto, Sho, Iwamoto, Toshiyuki, Iwasaki, Masako, Iwashita, Yoshihisa, Jia, Haoyi, Morales, Fabricio Jimenez, Joshi, Prakash, Jung, Sunghoon, Kacarevic, Goran, Kagan, Michael, Kakizaki, Mitsuru, Kalinowski, Jan, Kaminski, Jochen, Kanaya, Kazuyuki, Kanemura, Shinya, Kanno, Hayato, Kano, Yuya, Kashiwagi, Shigeru, Kato, Yukihiro, Kawada, Nanami, Kawada, Shin-ichi, Kawagoe, Kiyotomo, Khoze, Valery, Kichimi, Hiromichi, Kim, Doojin, Kitahara, Teppei, Kitano, Ryuichiro, Klamka, Jan, Komamiya, Sachio, Kong, K. C., Konomi, Taro, Kotera, Katsushige, Kou, Emi, Kravchenko, Ilya, Kubo, Kiyoshi, Kubo, Takayuki, Kumaoka, Takuya, Kumar, Ashish, Kumar, Nilanjana, Kunath, Jonas, Kundu, Saumyen, Kunitomo, Hiroshi, Kurata, Masakazu, Kuriki, Masao, Kusenko, Alexander, Lagouri, Theodota, Lankford, Andrew J., Lastovicka-Medin, Gordana, Diberder, Francois Le, Lee, Claire, Liepe, Matthias, Linacre, Jacob, Liptak, Zachary, Lomte, Shivani, Low, Ian, Ma, Yang, Maalouf, Hani, MacFarlane, David, Madison, Brendon, Madlener, Thomas, Maeda, Tomohito, Malek, Paul, Mandal, Sanjoy, Markiewicz, Thomas, Marshall, John, Martens, Aurelien, Martin, Victoria, Martinello, Martina, Rivero, Celso Martinez, Maru, Nobuhito, Matheson, John, Matsumoto, Shigeki, Matsunaga, Hiroyuki, Matsuo, Yutaka, Mawatari, Kentarou, Mbagwu, Johnpaul, McIntosh, Peter, McKeown, Peter, Meade, Patrick, Mekala, Krzysztof, Merkel, Petra, Mihara, Satoshi, Miralles, Víctor, Lopez, Marcos Miralles, Mishima, Go, Mishima, Satoshi, Mistlberger, Bernhard, Mitov, Alexander, Miyabayashi, Kenkichi, Miyamoto, Akiya, Mohanty, Gagan, Monaco, Laura, Mondragon, Myriam, Montgomery, Hugh E., Moortgat-Pick, Gudrid, Morange, Nicolas, Llacer, María Moreno, Moretti, Stefano, Mori, Toshinori, Morii, Toshiyuki, Moroi, Takeo, Morrissey, David, Nachman, Benjamin, Nagano, Kunihiro, Nakajima, Jurina, Nakamura, Eiji, Narita, Shinya, Nath, Pran, Nelson, Timothy, Newbold, David, Niki, Atsuya, Nishimura, Yasuhiro, Nishiyama, Eisaku, Nomura, Yasunori, Nowak, Kacper, Nozaki, Mitsuaki, de Vera, María Teresa Nunez Pardo, Ochoa, Ines, Ogata, Masahito, Ohashi, Satoru, Ohta, Hikaru, Ohta, Shigemi, Ohuchi, Norihito, Oide, Hideyuki, Okada, Nobuchika, Okada, Yasuhiro, Okawa, Shohei, Okayasu, Yuichi, Okugawa, Yuichi, Okugi, Toshiyuki, Okui, Takemichi, Okuyama, Yoshitaka, Omet, Mathieu, Omori, Tsunehiko, Ono, Hiroaki, Onoe, Tomoki, Ootani, Wataru, Otono, Hidetoshi, Ozawa, Shuhei, Griso, Simone Pagan, Papa, Alessandro, Paparella, Rocco, Park, Eun-Kyung, Perez, Gilad, Perez-Lorenzana, Abdel, Peters, Yvonne, Petriello, Frank, Piedra, Jonatan, Porod, Werner, Potter, Christopher, Price, Alan, Radkhorrami, Yasser, Reina, Laura, Reuter, Juergen, Richard, Francois, Riemann, Sabine, Rimmer, Robert, Rizzo, Thomas, Robens, Tania, Ruber, Roger, Jimeno, Alberto Ruiz, Saeki, Takayuki, Saha, Ipsita, Saito, Tomoyuki, Sakaguchi, Makoto, Sakai, Tadakatsu, Sakaki, Yasuhito, Sakurai, Kodai, Salvatico, Riccardo, Salvatore, Fabrizio, San, Yik Chuen, Sandick, Pearl, Sanuki, Tomoyuki, Sasikumar, Kollassery Swathi, Schaefer, Oliver, Schaefer, Ruth, Schneekloth, Uwe, Schoerner-Sadenius, Thomas, Schroeder, Carl, Schuster, Philip, Schwartzman, Ariel, Schwienhorst, Reinhard, Sefkow, Felix, Seiya, Yoshihiro, Sekiguchi, Motoo, Sekizawa, Kazuyuki, Senyo, Katsumi, Sert, Hale, Sertore, Danielev, Settles, Ronald, Shafi, Qaisar, Shahdara, Tetsuo, Haghi, Barmak Shams Es, Sharma, Ashish, Shelton, Jessie, Shepherd-Themistocleous, Claire, Shibuya, Hiroto, Shidara, Tetsuo, Shimomura, Takashi, Shindou, Tetsuo, Shoji, Yutaro, Shu, Jing, Sievers, Ian, Simon, Frank, Singh, Rajeev, Soreq, Yotam, Stanitzki, Marcel, Stapnes, Steinar, Steinhebel, Amanda, Stupak, John, Su, Shufang, Suekane, Fumihiko, Sugamoto, Akio, Sugawara, Yuji, Sugimoto, Satoru, Sugimoto, Yasuhiro, Sugiyama, Hiroaki, Sumino, Yukinari, Sundrum, Raman, Suzuki, Atsuto, Suzuki, Shin, Swiatlowski, Maximilian, Tait, Tim M. P., Takahashi, Shota, Takahashi, Tohru, Takeshita, Tohru, Takeuchi, Michihisa, Takubo, Yosuke, Tanabe, Tomohiko, Tanedo, Philip, Tanimoto, Morimitsu, Tao, Shuichiro, Tata, Xerxes, Tauchi, Toshiaki, Taylor, Geoffrey, Terada, Takahiro, Terunuma, Nobuhiro, Thaler, Jesse, Thea, Alessandro, Tillinger, Finn, Timmermans, Jan, Tobioka, Kohsaku, Toda, Kouichi, Tokiyasu, Atsushi, Toma, Takashi, Torndal, Julie, Tosun, Mehmet, Tsai, Yu-Dai, Tseng, Shih-Yen, Tsumura, Koji, Tuckler, Douglas, Uchida, Yoshiki, Uchiyama, Yusuke, Ueda, Daiki, Ukegawa, Fumihiko, Umemori, Kensei, Urakawa, Junji, Vallee, Claude, Vega, Roberto, Velasco, Liliana, Verdu-Andres, Silvia, Vernieri, Caterina, Vila, Anna, Alvarez, Ivan Vila, Vossebeld, Joost, Vsrms, Raghava, Vukasinovic, Natasa, Wackeroth, Doreen, Wakida, Moe, Wang, Liantao, Washio, Masakazu, Watanabe, Takashi, Watson, Nigel, Watts, Gordon, Weiglein, Georg, Wells, James D., Wenskat, Marc, Westhoff, Susanne, White, Glen, Williams, Ciaran, Willocq, Stephane, Wing, Matthew, Winter, Alasdair, Winter, Marc, Wu, Yongcheng, Xie, Keping, Xu, Tao, Yakovlev, Vyacheslav, Yamada, Shuei, Yamamoto, Akira, Yamamoto, Hitoshi, Yamamoto, Kei, Yamamoto, Yasuchika, Yamanaka, Masato, Yamashita, Satoru, Yamatani, Masahiro, Yamatsu, Naoki, Yasui, Shigehiro, Yoda, Takuya, Yonamine, Ryo, Yoshihara, Keisuke, Yoshioka, Masakazu, Yoshioka, Tamaki, Yuasa, Fukuko, Yumino, Keita, Zerwas, Dirk, Zheng, Ya-Juan, Zhou, Jia, Zhu, Hua Xing, Zobov, Mikhail, Zomer, Fabian

مصطلحات موضوعية: Physics - Accelerator Physics, High Energy Physics - Experiment, High Energy Physics - Phenomenology

الوصف: The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This document brings the story of the ILC up to date, emphasizing its strong physics motivation, its readiness for construction, and the opportunity it presents to the US and the global particle physics community.
Comment: 356 pages, Large pdf file (40 MB) submitted to Snowmass 2021; v2 references to Snowmass contributions added, additional authors; v3 references added, some updates, additional authors

URL الوصول: http://arxiv.org/abs/2203.07622

المؤلفون: Sasikumar, Kollassery Swathi

الوصف: Dissertation, Universität Hamburg, 2020; Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY THESIS 221 pp. (2020). doi:10.3204/PUBDB-2021-01241 = Dissertation, Universität Hamburg, 2020
The International Linear Collider is a proposed $e^{+}e^{-}$ collider with tunable centre-of-mass energies and polarised beams. By performing high-precision measurements of Standard Model observables and searches for new particles the ILC can serve as a complementary machine to the LHC.In supersymmetric extensions of the Standard Model, higgsino-like charginos and neutralinos are preferred to have masses of the order of the electroweak scale by naturalness arguments. Such light $\tilde{\chi}_{1}^{\pm}$, $\tilde{\chi}^{0}_{1}$ and $\tilde{\chi}^{0}_{2}$ states can be almost mass degenerate. Due to their mass degeneracy it is very difficult to observe the decay of such higgsinos at hadron colliders. ILC being an $e^+e^-$ collider has the prospect of providing a very clean physics environment to observe or exclude such scenarios. However, in addition to the desired $e^{+}e^{-}\rightarrow\tilde{\chi}^{+}\tilde{\chi}^{-}$ processes, parasitic collisions of real and virtual photons radiated off the $e^+e^-$ beams occurat the rates depending on the centre-of-mass energy (250 GeV - 1 TeV) and other beam parameters. In this thesis the effects of such $\gamma\gamma\rightarrow$ low $p_{T}$ hadron overlay on the low $\Delta M$ higgsino analysis is studied.The study considers two benchmark points that exhibits mass differences of $\mathcal{O}$ [1 GeV] in the higgsino sector. In the given higgsino scenarios, the visible decay products have low transverse momenta due to the small mass differences between the higgsinos. The $\gamma\gamma\rightarrow$ low $p_{T}$ hadron overlay has a very similartopology to the signal event which makes the removal of the overlay very challenging.The standard methods to remove $\gamma\gamma$ background, e.g methods based on jet clustering remain inadequate. The study presents a newly developed track grouping algorithm which is based on the concept of displaced signal and $\gamma\gamma\rightarrow$ low $p_{T}$ hadron overlay vertices. By applying the track grouping algorithm to separate $\gamma\gamma\rightarrow$ low $p_{T}$ hadron tracks from the higgsino decay tracks, ananalysis has been performed using the full detector simulation for the International Large Detector (ILD). It is shown that the group tracking algorithm can very efficiently separate $\gamma\gamma\rightarrow$ low $p_{T}$ hadron tracks from the higgsinodecay tracks. The results from the analysis show that even with the presence of $\gamma\gamma\rightarrow$ low $p_{T}$ hadron overlay, the key observables of the higgsinos can be reconstructed with an uncertainty of a few percent. A comparison with the previous study which was performedwithout the inclusion of $\gamma\gamma\rightarrow$ low $p_{T}$ hadron events is made to enhance the understanding about the effects of the overlay on the higgsino analysis.
Published by Verlag Deutsches Elektronen-Synchrotron, Hamburg

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::b01a645f92cdcf60611e3cf6f53d6fd2

المؤلفون: Sasikumar, Kollassery Swathi, List, Jenny, Berggren, Carl Mikael, Lehtinen, Suvi-Leena, Fuji, Keisuke, Yan, Jacqueline, Tanabe, Tomohiko, Baer, Howard

الوصف: The European Physical Society - High Energy Physics Conference 2019, EPS-HEP 2019, Ghent, Belgium, Belgium, 10 Jul 2019 - 17 Jul 2019; Proceedings of Science (2020).
The requirement of electroweak naturalness in simple supersymmetric models motivates the existence of a cluster of four light higgsinos with mass $100 - 300$ GeV, the lighter the better. While such light compressed spectra may be challenging to observe at the LHC, future $e^+e^-$ colliders with $\sqrt{s} > 2$m(higgsino) would serve as both a SUSY discovery machine and a precision microscope.We study signatures of higgsino pair production at the ILC based on full, Geant4-based simulation of the ILD detector concept. We examine several benchmark scenarios that may or may not be accessible to HL-LHC searches, with mass differences between the higgsino states between 4 and 20 GeV. Assuming $\sqrt{s}\geq$ 500 GeV and $1000$ fb$^{-1}$ of integrated luminosity, the individual higgsino masses can be measured to $1 - 2\%$ precision in case of the larger mass differences, and at the level of 5$\%$ for the smallest mass difference case. The higgsino mass splittings are sensitive to the electroweak gaugino masses and can allow extraction of gaugino masses to $3 - 20\%$ (depending on the model). Extrapolation of gaugino masses via renormalization group running can test the hypothesis of gaugino mass unification. We also examine a case with natural generalized mirage mediation where the unification of gaugino masses at an intermediate scale apparently gives rise to a natural SUSY spectrum somewhat beyond the reach of the HL-LHC.
Published by Proceedings of Science

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::f4de4cc468b84b2f43744f6f7cb1e041

المؤلفون: Sasikumar, Kollassery Swathi, List, Jenny, Berggren, Carl Mikael

المصدر: Pre-ILD Software Analysis Meeting, Pre-ILD Meeting, Ichinoseki, DESY, Japan, 2018-02-18-2018-02-19

الوصف: Pre-ILD Software Analysis Meeting, Pre-ILD Meeting, Ichinoseki, DESY, Japan, 18 Feb 2018 - 19 Feb 2018

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d4cb0f478515699a75788e34b93f2811

المؤلفون: Berggren, Carl Mikael, Sasikumar, Kollassery Swathi, List, Jenny, Sert, Hale, Moortgat-Pick, Gudrid, Robens, Tanja, Bruemmer, Felix, Rolbiecki, Krzysztof

المصدر: Asain Linear Collider Workshop, ALCW18, Fukuoka, Japan, 2018-05-28-2018-06-01

الوصف: Asain Linear Collider Workshop, ALCW18, Fukuoka, Japan, 28 May 2018 - 1 Jun 2018

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4efeb89df6129d37b627c6ba916599b9
https://bib-pubdb1.desy.de/record/416621

المؤلفون: Sasikumar, Kollassery Swathi, List, Jenny, Berggren, Carl Mikael

المصدر: LC forum-Helmholtz Terascale Meeting, Hamburg, DESY, Germany, 2017-11-27-2017-11-29
ILD Software Meeting 2017, Lyon, IPNL, France, 2017-04-24-2017-04-28

الوصف: LC forum - Helmholtz Terascale Meeting, Hamburg, DESY, Germany, 27 Nov 2017 - 29 Nov 2017

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a47f0d16b3d13854d057bec881baa01
https://bib-pubdb1.desy.de/record/398112

المؤلفون: Sasikumar, Kollassery Swathi, List, Jenny

الوصف: 10th Annual meeting of Helmholtz Alliance “Physics at Terascale”, Hamburg, DESY, Germany, 21 Nov 2016 - 23 Nov 2016 ; (2016).

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3e8379b36e923bf1e53df438d1a8bb56

المؤلفون: Sasikumar, Kollassery Swathi

الوصف: PIER PhD Seminar, DESY, Hamburg, DESY, Germany, 17 Nov 2016 - 17 Nov 2016 ; (2016).

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::1e46f26bdc2a6467e6afca25e018c6a4

المؤلفون: Sasikumar, Kollassery Swathi

المساهمون: List, Jenny

المصدر: 9th Annual Meeting of the Helmholtz Alliance "Physics at the Terascale", Hamburg, DESY, Germany, 2015-11-17-2015-11-19

الوصف: 9th Annual Meeting of the Helmholtz Alliance "Physics at the Terascale", Hamburg, DESY, Germany, 17 Nov 2015 - 19 Nov 2015 ; (2015).

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6504fb777e1d3681c6ae57cba8002a8d
https://bib-pubdb1.desy.de/record/316030

المؤلفون: Sasikumar, Kollassery Swathi, List, Jenny, Berggren, Carl Mikael

المصدر: Linear Collider Workshop 2015, LCWS, Whistler, DESY, Canada, 2015-11-02-2015-11-06
DPG Spring Meeting 2017, Muenster, Germany, 2017-03-27-2017-03-31

الوصف: Linear Collider Workshop 2015, LCWS, Whistler, DESY, Canada, 2 Nov 2015 - 6 Nov 2015 ; (2015).
the ILC physics program enables us to make high precision measurements of themost celebrated “Higgs Boson” and to know more about the BSM particles. The γγbackgrounds are one of the major challenges we are facing today. As far as now wehave tried to suppress these backgrounds using the KT algorithm methods and havebeen successful in a certain ways. But the precision measurements of a few cases likeHiggsinos with very small mass differences and important cases like Higgs selfcouplingare very difficult due to γγ overlay. As the decay products of Higgsinoshave low momentum they move along the z-axis and thus cannot be distinguishedamong the γγ backgrounds using the KT algorithm methods. Higgs self-couplingevents are so very rare that while eradicating γγ backgrounds using KT algorithmthere are fair chances of loosing the important signals. In this presentation, we discussthe need of reliable simulation of the detailed properties of γγ events. We study the γγevents used in DBD simulations and compare it to the alternative descriptions andthus try to determine their properties.

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ddf5926b438bab44cdddab1ca27bfc10
https://bib-pubdb1.desy.de/record/316028