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1. The ILC as a natural SUSY discovery machine and precision microscope: from light higgsinos to tests of unification

Author

Baer, Howard, Berggren, Mikael, Fujii, Keisuke, List, Jenny, Lehtinen, Suvi-Leena, Tanabe, Tomohiko, and Yan, Jacqueline

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

The requirement of electroweak naturalness in simple supersymmetric models implies the existence of a cluster of four light higgsinos with mass $\sim 100-300$\,GeV, the lighter the better. While such light compressed spectra may be challenging to observe at LHC, the International Linear $e^+e^-$ Collider (ILC) with $\sqrt{s}>2m_{\rm higgsino}$ would serve as both a SUSY discovery machine and a precision microscope. We study higgsino pair production signatures at the ILC based on full, \texttt{Geant4-}based simulation of the ILD detector concept. We examine several benchmark scenarios that may be challenging for discovery at HL-LHC due to mass differences between the higgsino states between $20$ and $4$\,GeV. Assuming $\sqrt{s}= 500$\,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 allow extraction of gaugino masses to $\sim 3-20\%$ (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 HL-LHC., Comment: 43 pages, 33 figures

Published
2019
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2. Naturalness and light Higgsinos: why ILC is the right machine for SUSY discovery

Author

Lehtinen, Suvi-Leena, Baer, Howard, Berggren, Mikael, Fujii, Keisuke, List, Jenny, Tanabe, Tomohiko, and Yan, Jacqueline

Subjects
High Energy Physics - Phenomenology
Abstract

Radiatively-driven natural supersymmetry, a theoretically and experimentally well-motivated framework, centers around the predicted existence of four light, nearly mass-degenerate Higgsinos with mass $\sim 100-200$ GeV (not too far above $m_Z$). The small mass splittings amongst the higgsinos, typically 4-20 GeV, results in very little visible energy arising from decays of the heavier higgsinos. Given that other SUSY particles are considerably heavy, this makes detection challenging at hadron colliders. On the other hand, the clean environment of an electron-positron collider with $\sqrt{s}>2m_{higgsino}$ would enable a decisive search of these required higgsinos, and thus either the discovery or exclusion of natural SUSY. We present a detailed simulation study of precision measurements of higgsino masses and production cross sections at $\sqrt{s}$ = 500 GeV of the proposed International Linear Collider currently under consideration for construction in Japan. The study is based on a Geant4 simulation of the International Large Detector concept. We examine several benchmark points just beyond the HL-LHC reach, with four light higgsinos directly accessible by the ILC, and the mass differences between the lightest SUSY particle and the heavier states ranging from about 4 to 20 GeV. It can be shown that their masses and production cross sections can be precisely measured to approximately 1\% precision or better. These precise measurements allow for extracting the underlying weak scale SUSY parameters, giving predictions for the masses of heavier SUSY states. These provide motivation for future high-energy colliders. Additionally, dark matter properties may be derived. Evolution of the measured gaugino masses to high energies should allow testing the hypothesis of gaugino mass unification., Comment: 6 pages, 4 figures; to appear in the proceedings for EPS-HEP2017, 5-12 July 2017, Venice, Italy

Published
2017

3. The Potential of the ILC for Discovering New Particles

Author

Fujii, Keisuke, Grojean, Christophe, Peskin, Michael E., Barklow, Tim, Gao, Yuanning, Kanemura, Shinya, Kim, Hyungdo, List, Jenny, Nojiri, Mihoko, Perelstein, Maxim, Pöschl, Roman, Reuter, Jürgen, Simon, Frank, Tanabe, Tomohiko, Wells, James D., Yu, Jaehoon, Baer, Howard, Berggren, Mikael, Heinemeyer, Sven, Lehtinen, Suvi-Leena, Tian, Junping, Wilson, Graham, Yan, Jacqueline, Murayama, Hitoshi, and Brau, James

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

This paper addresses the question of whether the International Linear Collider has the capability of discovering new particles that have not already been discovered at the CERN Large Hadron Collider. We summarize the various paths to discovery offered by the ILC, and discuss them in the context of three different scenarios: 1. LHC does not discover any new particles, 2. LHC discovers some new low mass states and 3. LHC discovers new heavy particles. We will show that in each case, ILC plays a critical role in discovery of new phenomena and in pushing forward the frontiers of high-energy physics as well as our understanding of the universe in a manner which is highly complementary to that of LHC. For the busy reader, a two-page executive summary is provided at the beginning of the document., Comment: 52 pages, 18 figures

Published
2017

4. Naturalness and light higgsinos: A powerful reason to build the ILC

Author

Baer, Howard, Berggren, Mikael, Fujii, Keisuke, Lehtinen, Suvi-Leena, List, Jenny, Tanabe, Tomohiko, and Yan, Jacqueline

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

A core prediction of natural Supersymmetry is the existence of four light higgsinos not too far above the mass of the $Z$ boson. The small mass splittings amongst the higgsinos -- typically 5-20\,GeV -- imply very little visible energy release from decays of heavier higgsinos. In particular, if other SUSY particles are quite heavy, as can be the case in SUSY with radiatively-driven naturalness, the higgsinos are extremely hard to detect at hadron colliders. The clean environment of electron-positron colliders with $\sqrt{s} > 2m_{\mathrm{higgsino}}$, however, would allow for a decisive search for the required light higgsinos. Thus, $e^+e^-$ colliders should either discover or exclude natural SUSY. We present a detailed study of higgsino pair production at the proposed International Linear $e^+e^-$ Collider which is under consideration for construction in Japan. A variety of precision measurements should allow for extraction of underlying parameters and provide a window onto physics at the grand unified scale., Comment: 5pages plus title page, proceedings ICHEP 2016

Published
2016

5. Dark matter relic density from observations of supersymmetry at the ILC

Author

Lehtinen, Suvi-Leena, Berggren, Mikael, and List, Jenny

Subjects
High Energy Physics - Phenomenology
Abstract

Supersymmetry can explain the observed dark matter relic density with a neutralino dark matter particle and a coannihilating, almost mass-degenerate sparticle. If this were the case in nature, a linear electron positron collider like the ILC could discover the two sparticles if their masses are in the kinematic reach of the collider. This contribution discusses which observations are necessary at the ILC for predicting the dark matter relic density correctly and for confirming that the observed lightest neutralino is the only kind of dark matter. We take the case of stau coannihilation as an example., Comment: 8 pages, 6 figures, Talk presented at the International Workshop on Future Linear Colliders (LCWS15), Whistler, Canada, 2-6 November 2015

Published
2016

6. The ILC as a natural SUSY discovery machine andprecision microscope: From light higgsinos to tests of unification

Author

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

Abstract

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

Published
2020
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7. The ILD detector at the ILC

Author

Abramowicz, Halina, Agatonovic Jovin, Tatjana, Alonso, Oscar, Amjad, Mohammad Sohail, An, Fenfen, Andricek, Ladislav, Anduze, Marc, Anguiano, Justin, Antonov, Evgeny, Aoki, Yumi, Arteche, Fernando, Attié, David, Büscher, Volker, Bach, Ole, Balagura, Vladislav, Baudot, Jérome, Begunov, Vadim, Behera, Subhasish, Behnke, Ties, Bellerive, Alain, Belver, Daniel, Benhammou, Yan, Berggren, Mikael, Berriaud, Christophe, Bertolone, Gregory, Besançon, Marc, Besson, Auguste, Beyer, Jakob, Bezshyyko, Oleg, Bhattacharya, Deb Sankar, Bhattacharya, Purba, Bocharnikov, Vladimir, Boronat, Marca, Borysov, Oleksandr, Bosley, Robert, Boudry, Vincent, Boumedine, Djamel, Bourgeois, Christian, Bozovic Jelisavcic, Ivanka, Breton, Dominique, Brianne, Eldwan, Brient, Jean-Claude, Briggl, Konrad, Buesser, Karsten, Callier, Stephane, Calvo Alamillo, Enrique, Carrillo, Camilo, Catalán, Ana, Chadeeva, Marina, Chau, Phi, Chera, Madalina, Chetverushkin, Boris, Chrzaszcz, Marcin, Claus, Gilles, Colas, Paul, Colledani, Claude, Combaret, Christophe, Cornat, Rémi, Corriveau, Francois, Cvach, Jaroslav, Danilov, Mikhail, de La Taille, Christophe, Deguchi, Yuto, Desch, Klaus, Dieguez, Angel, Diener, Ralf, Dixit, Madhu, Dong, Mingyi, Dorokhov, Andrei, Dozière, Guy, Drutskoy, Alexey, Dulucq, Frederic, Edy, Evelyne, Einhaus, Ulrich, El Bitar, Ziad, Elkhalii, Amine, Emberger, Lorenz, Esperante, Danniel, Eté, Rémi, Fang, Yaquan, Fedorchuk, Oleksiy, Firlej, Miroslaw, Fiutowski, Tomasz, Fleck, Ivor, Fouz, María Cruz, Fujii, Kazuki, Fujii, Keisuke, Fullana, Esteban, Fusayasu, Takahiro, Fuster, Juan, Göttlicher, Peter, Gadow, Karsten, Gaede, Frank, Gallas, Alexandre, Ganjour, Serguei, García, Ignacio, Cabrera, Hector García, Garillot, Guillaume, Garutti, Erika, Gastaldi, Franck, Ghislain, Patrick, Goffe, Mathieu, Gomis, Pablo, Gong, Wenxuan, Gonnin, Alexandre, Goswami, Deepanjali, Goto, Kiichi, Graf, Christian, Gregor, Ingrid-Maria, Grenier, Gerald, Guillaumat, Rémi, Habermehl, Moritz, Hagge, Lars, Hartbrich, Oskar, Hartjes, Fred, Henschel, Hans, Heuchel, Daniel, Hidalgo, Salvador, Himmi, Abdelkader, Hu, Tao, Hu-Guo, Christine, Ianigro, Jean-Christophe Tibor, Idzik, Marek, Irles, Adrian, Ishihara, Hiroki, Ishikawa, Akimasa, Jönsson, Leif, Jaaskelainen, Kimmo, Jeans, Daniel, Jeglot, Jimmy, Kacarevic, Goran, Kachel, Maciej, Kajiwara, Shogo, Kalinowski, Jan, Kaminski, Jochen, Kamiya, Yoshio, Karl, Robert, Kato, Yu, Kato, Yukihiro, Kawada, Shin-ichi, Kawagoe, Kiyotomo, Khan, Sameen A, Kleinwort, Claus, Kluit, Peter, Kobayashi, Makoto, Koffmane, Christian, Komamiya, Sachio, Korpachev, Sergey, Kotera, Katsushige, Krämer, Uwe, Krüger, Katja, Kunath, Jonas, Kurata, Masakazu, Kurca, Tibor, Kvasnicka, Jirí, Lacour, Didier, Laktineh, Imad, Lange, Wolfgang, Lehtinen, Suvi-Leena, Lesiak, Tadeusz, Levy, Aharon, Levy, Itamar, Li, Bo, Li, Gang, Ligtenberg, Cornelis, List, Benno, List, Jenny, Liu, Linghui, Liu, Yong, Liu, Zhenan, Lohmann, Wolfgang, Louzir, Marc, Lu, Shaojun, Lundberg, Bjoern, Maalmi, Jihane, Magniette, Frédéric, Majumdar, Nayana, Makida, Yasuhiro, Malek, Paul, Marín, Jesús, Marshall, John, Martens, Stephan, Martin-Chassard, Gisele, Masetti, Lucia, Masuda, Ryunosuke, Mathez, Herve, Matsuda, Takeshi, McDonaldS, Kirk T, Mikhaylov, Dmitry, Mirabito, Laurent, Miroshin, Sergey, Mitaroff, Winfried, Miyamoto, Akiya, Mizuno, Takahiro, Mjönmark, Ulf, Mogi, Takanori, Moortgat-Pick, Gudrid, Morel, Frédéric, Moreno, Sergio, Mori, Toshinori, Moron, Jakub, Moya, David, Mukhopadhyay, Supratik, Munwes, Yonathan, Nanni, Jérome, Napoly, Olivier, Narita, Shinya, Navarrete, Jose Javier, Negishi, Kentaro, Ninkovic, Jelena, Noori Shirazi, Amir, Ogawa, Tomohisa, Okamura, Takahiro, Omori, Tsunehiko, Ono, Hiroaki, Ootani, Wataru, Oskarsson, Anders, Ostermann, Lennart, Ouyang, Qun, Pöschl, Roman, Parraud, Jean-Marc, Pawlik, Bogdan, Pellegrini, Giulio, Perello, Martin, Perez, Alejandro, Pham, Hung, Piedrafita, Javier, Pierre-Emile, Thomas, Pingault, Antoine, Pinto, Olin Lyod, Polák, Ivo, Popova, Elena, Poulose, Poulose, Pradas, Alvaro, Prahl, Volker, Price, Tony, Provenza, Ambra, Pelayo, Jesús Puerta, Qi, Huirong, Radkhorrami, Yasser, Raux, Ludovic, Raven, Gerhard, Reinecke, Mathias, Richard, Francois, Richter, Rainer, Riemann, Sabine, Robles Manzano, Maria Soledad, Rogan, Christopher, Rolph, Jack, Ros, Eduardo, Rosmanitz, Anna, Royon, Christophe, Ruan, Manqi, Ruiz-Jimeno, Alberto, Sasikumar, Swathi Kollassery, Saveliev, Andrey, Saveliev, Valery, Schäfer, Oliver, Schmitt, Christian, Schneekloth, Uwe, Schoerner-Sadenius, Thomas, Schultz-Coulon, Hans-Christian, Schuwalow, Sergej, Sefkow, Felix, Seguin-Moreau, Nathalie, Sekiya, Izumi, Settles, Ronald, Shekhtman, L, Shen, Wei, Shiraz, Ryousuke, Shoji, Aiko, Simon, Frank, Sinram, Klaus, Smiljanic, Ivan, Specht, Matthieu, Stromhagen, Richard, Sudo, Yuji, Suehara, Taikan, Sugimoto, Yasuhiro, Sugiyama, Akira, Sun, Zhihong, Swientek, Krzysztof, Takahashi, Tohru, Takeshita, Tohru, Tamaya, Yukinaru, Tanabe, Tomohiko, Tauchi, Toshiaki, Telnov, Valery, Terlecki, Pzremyslaw, Thiebault, Alice, Tian, Junping, Timmermans, Jan, Titov, Maxim, Tran, Huong Lan, Tread, Reima, Tsionou, Dimitra, Tsuji, Naoki, Tuchming, Boris, Tytgat, Michael, Uesugi, Yuto, Uozumi, Satoru, Valin, Isabelle, Vallée, Claude, van der Graaf, Harry, Van Der Kolk, Naomi, van Doren, Brian, Verdugo de Osa, Antonio, Vidal, Guillem, Videau, Henri, Vila, Iván, Villarrejo, Miguel Angel, Volkov, Denis, Vos, Marcel, Vukasinovic, Natasa, Wang, Yan, Watanabe, Takashi, Watson, Nigel, Werthenbach, Ulrich, Wilson, Graham W, Wing, Matthew, Winter, Alasdair, Winter, Marc, Wojtoń, Tomasz, Yamashita, Satoru, Yoshioka, Tamaki, Yu, Boxiang, Yu, Dan, Yuan, Zhenxiong, Yumino, Keita, Zarnecki, Aleksander Filip, Zeitnitz, Christian, Zerwas, Dirk, Zhao, Hang, Zhao, Jingzhou, Zhao, Ruiguang, Zhao, Yüe, Zhu, Hongbo, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and ILD

Subjects
detector: technology, Physics::Instrumentation and Detectors, ILD detector, site, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Accelerator Physics, High Energy Physics::Experiment, tracking detector, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], ILC Coll, detector: design, activity report
Abstract

The International Large Detector, ILD, is a detector concept which has been developed for the electron-positron collider ILC. The detector has been optimized for precision physics in a range of energies between 90 GeV and 1 TeV. ILD features a high precision, large volume combined silicon and gaseous tracking system, together with a high granularity calorimeter, all inside a 3.5 T solenoidal magnetic field. The paradigm of particle flow has been the guiding principle of the design of ILD. In this document the required performance of the detector, the proposed implementation and the readiness of the different technologies needed for the implementation are discussed. This is done in the framework of the ILC collider proposal, now under consideration in Japan, and includes site specific aspects needed to build and operate the detector at the proposed ILC site in Japan.

Published
2019

10. Supersymmetry parameter determination at the International Linear Collider

Author

Lehtinen, Suvi-Leena, List, Jenny, and Sander, Christian

Subjects
High Energy Physics::Phenomenology
Abstract

In this thesis, the prospects for determining supersymmetry parameters from observationsof supersymmetric particles at the International Linear Collider (ILC) areinvestigated. Supersymmetry (SUSY) has been proposed in order to solve gaps inthe Standard Model of particle physics, among them the hierarchy problem and theunexplained dark matter content in the universe. There are many free parameters insupersymmetry, whose values give rise to the properties of the supersymmetric particleswhich can be searched for by experiments. While the Large Hadron Collider (LHC)has successfully excluded many possible scenarios, regions of parameter space remainunexplored, especially where the supersymmetric particles decay with little visible energy.For example, models with light higgsinos or scalar tau coannihilation can escapedetection at the LHC. These kinds of scenarios could be discovered or excluded by theproposed ILC, which would collide polarised electron and positron beams at the centreof-mass energy of 500 GeV. The advantages of this machine over the LHC, namely itsthe clean experimental environment and triggerless detector operation, would allow forthe discovery of almost any particle within its kinematic reach.If supersymmetric discoveries were made at the ILC, it would be possible to measurethe properties of the SUSY particles very precisely. These measurements enable determiningsome of the underlying SUSY parameters via tting the parameters to theSUSY observations. In this thesis, a 10-parameter or 13-parameter phenomenologicalMinimal Supersymmetric Standard Model and high-scale 4-6-parameter models(CMSSM, NUHM1 and NUHM2) are tted to sets of possible observations from theILC. Two types of scenarios are considered: light higgsinos motivated by naturalness,and scalar tau coannihilation motivated by the dark matter relic density. It is shownthat the precision measurements of the SUSY and Higgs sectors allow for determiningsome of the SUSY parameters. Additionally, strong predictions for unobserved heavyparticle masses can be made, leading to guidance on future high-energy particle colliders.Furthermore, it is possible under certain circumstances to check whether theobserved particles explain the dark matter relic density. It is shown that the permilleor percent-level measurements from the International Large Detector are crucial formaking these predictions. Additionally, the determined parameters in the weak scalets are evolved to the GUT scale to test the gaugino mass unication hypothesis. Theresults give a strong argument for building an electron-positron collider to close thegaps in the LHC searches or to study any particles that the latter nds.

Published
2018

12. Natural SUSY at the ILC: from MZ to the GUT scale

Author

Berggren, Carl Mikael, Fujii, Keisuke, List, Jenny, Tanabe, Tomohiko, Lehtinen, Suvi-Leena, Baer, Howard, and Yan, Jacqueline

Subjects
High Energy Physics::Phenomenology
Abstract

an Alpine LHC Physics Summit, ALPS 2017, Obergurgl, Austria, 17 Apr 2017 - 22 Apr 2017, The most basic requirement for naturalness in supersymmetric models is theexistence of rather light partners of the Higgs boson, the Higgsinos, atmasses not too far above M_Z. Despite the pressure from LHC data on the simplesthigh-scale models (like the cMSSM), such light Higgsinos can still berealised in different types of GUT-scale models from NUHM2 to mirageunification models. The ILC will offer the unique discovery potentialfor the elusive higgsino particles and allow for precision measurementsof their properties. In this contribution, prospects for the achievableprecisions for masses, the very small mass splittings and polarised productioncross sections will be presented. Based on these, we studied the possibilities todetermine the SUSY parameters at the weak scale, and to extrapolate theirrunning to the GUT scale. We will discuss the prospects to therebydifferentiate between various GUT-scale models and SUSY breaking schemes andto predict the masses of the remaining SUSY particles. In particular thelatter could provide important guidance for the energy scale of the next hadron collider after the LHC.

Published
2017
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15. Light higgsinos - a powerful reason to build the ILC

Author

Lehtinen, Suvi-Leena, Berggren, Carl Mikael, List, Jenny, Baer, Howard, Fujii, Keisuke, Tanabe, Tomohiko, and Yan, Jacqueline

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

International Conference on Supersymmetry and Unification of Fundamental Interactions, SUSY, Melbourne, Australia, 4 Jul 2016 - 8 Jul 2016, Natural SUSY with light, nearly mass-degenerate Higgsinos is a theoretically well motivated scenario which would in general escape LHC searches. An electron-positron collider would provide a clean environment where the Higgsinos would be either discovered or excluded. We present a detailed study of precision measurements of Higgsinos at the proposed International Linear Collider with √s = 500 GeV, using a Geant4-based simulation of the International Large Detector concept. The scenarios considered have Higgsino mass differences of 10 - 20 GeV and a heavy scalar sector. The precision measurements can be used to determine the parameters of NUHM2. Alternatively, weak scale gaugino masses can be extracted which allows for tests of gaugino mass unification.

Published
2016
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18. Dark matter relic density from observations of supersymmetry at the ILC

Author

Lehtinen, Suvi-Leena

Subjects
Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Astrophysics::Cosmology and Extragalactic Astrophysics
Abstract

If supersymmetric particles were discovered at the ILC, would we be able to prove that the dark matter candidate discovered is the only dark matter particle? This was investigated using a scenario with a mostly bino lightest supersymmetric particle and a coannihilating stau. In this scenario, the ILC could find the sleptons and lighter gauginos, while the LHC could discover and measure parts of the coloured spectrum. We will demonstrate which measurements and precisions are needed to determine whether the observed dark matter candidate is the sole constituent of the dark matter relic density. The required precisions will be compared to the predicted precisions at the ILC.

Published
2015

20. International Large Detector: Interim Design Report

Author

Abramowicz, Halina, Agatonovic Jovin, Tatjana, Alonso, Oscar, Amjad, Mohammad Sohail, An, Fenfen, Andricek, Ladislav, Anduze, Marc, Anguiano, Justin, Antonov, Evgeny, Aoki, Yumi, Arteche, Fernando, Attié, David, Büscher, Volker, Bach, Ole, Balagura, Vladislav, Baudot, Jérome, Begunov, Vadim, Behera, Subhasish, Behnke, Ties, Bellerive, Alain, Belver, Daniel, Benhammou, Yan, Berggren, Mikael, Berriaud, Christophe, Bertolone, Gregory, Besançon, Marc, Besson, Auguste, Beyer, Jakob, Bezshyyko, Oleg, Bhattacharya, Deb Sankar, Bhattacharya, Purba, Blazey, Gerald, Bocharnikov, Vladimir, Boronat, Marca, Borysov, Oleksandr, Bosley, Robert, Boudry, Vincent, Boumediene, Djamel, Bourgeois, Christian, Bozovic Jelisavcic, Ivanka, Breton, Dominique, Brianne, Eldwan, Brient, Jean-Claude, Briggl, Konrad, Buesser, Karsten, Callier, Stephane, Calvo Alamillo, Enrique, Carrillo, Camilo, Catalán, Ana, Chadeeva, Marina, Chau, Phi, Chera, Madalina, Chetverushkin, Boris, Chrzaszcz, Marcin, Claus, Gilles, Colas, Paul, Colledani, Claude, Combaret, Christophe, Cornat, Rémi, Corriveau, Francois, Danilov, Mikhail, Deguchi, Yuto, Desch, Klaus, Dieguez, Angel, Diener, Ralf, Dixit, Madhu, Dong, Mingyi, Dorokhov, Andrei, Dozière, Guy, Drutskoy, Alexey, Dulucq, Frederic, Dyshkant, Alexander, Edy, Evelyne, Eigen, Gerald, Einhaus, Ulrich, El Bitar, Ziad, Elkhalii, Amine, Emberger, Lorenz, Esperante, Danniel, Eté, Rémi, Fang, Yaquan, Fedorchuk, Oleksiy, Firlej, Miroslaw, Fiutowski, Tomasz, Fleck, Ivor, Fourches, Nicolas, Fouz, María Cruz, Francis, Kurt, Fujii, Kazuki, Fujii, Keisuke, Fullana, Esteban, Fusayasu, Takahiro, Fuster, Juan, Göttlicher, Peter, Gadow, Karsten, Gaede, Frank, Gallas, Alexandre, Ganjour, Serguei, García, Ignacio, García Cabrera, Hector, Garillot, Guillaume, Garutti, Erika, Gastaldi, Franck, Ghislain, Patrick, Goffe, Mathieu, Gomis, Pablo, Gong, Wenxuan, Gonnin, Alexandre, Goswami, Deepanjali, Goto, Kiichi, Graf, Christian, Gregor, Ingrid-Maria, Grenier, Gerald, Guillaumat, Réi, Habermehl, Moritz, Hagge, Lars, Hartbrich, Oskar, Hartjes, Fred, Henschel, Hans, Heuchel, Daniel, Hidalgo, Salvador, Himmi, Abdelkader, Hu, Tao, Hu-Guo, Christine, Ianigro, Jean-Christophe Tibor, Idzik, Marek, Irles, Adrian, Ishihara, Hiroki, Ishikawa, Akimasa, Jönsson, Leif, Jaaskelainen, Kimmo, Jeans, Daniel, Jeglot, Jimmy, Kacarevic, Goran, Kachel, Maciej, Kajiwara, Shogo, Kalinowski, Jan, Kaminski, Jochen, Kamiya, Yoshio, Karl, Robert, Kato, Yu, Kato, Yukihiro, Kawada, Shin-Ichi, Kawagoe, Kiyotomo, Khan, Sameen A, Kleinwort, Claus, Kluit, Peter, Kobayashi, Makoto, Koffmane, Christian, Komamiya, Sachio, Korpachev, Sergey, Kotera, Katsushige, Krämer, Uwe, Krüger, Katja, Kunath, Jonas, Kurata, Masakazu, Kurca, Tibor, Kvasnicka, Jirí, Lacour, Didier, Laktineh, Imad, Lange, Wolfgang, Lehtinen, Suvi-Leena, Lesiak, Tadeusz, Levy, Aharon, Levy, Itamar, Li, Bo, Li, Gang, Ligtenberg, Cornelis, List, Benno, List, Jenny, Liu, Linghui, Liu, Yong, Liu, Zhenan, Lohmann, Wolfgang, Louzir, Marc, Lu, Shaojun, Lundberg, Bjoern, Maalmi, Jihane, Magniette, Frédéric, Majumdar, Nayana, Makida, Yasuhiro, Malek, Paul, Marín, Jesús, Marshall, John, Martens, Stephan, Martin-Chassard, Gisele, Masetti, Lucia, Masuda, Ryunosuke, Mathez, Herve, Matsuda, Takeshi, McDonald, Kirk T, Mikhaylov, Dmitry, Mirabito, Laurent, Miroshin, Sergey, Mitaroff, Winfried, Miyamoto, Akiya, Mizuno, Takahiro, Mjörnmark, Ulf, Mogi, Takanori, Moortgat-Pick, Gudrid, Morel, Frédéric, Moreno, Sergio, Mori, Toshinori, Moron, Jakub, Moya, David, Mukhopadhyay, Supratik, Munwes, Yonathan, Nagamine, Tadashi, Nanni, Jérome, Napoly, Olivier, Narita, Shinya, Navarrete, Jose Javier, Negishi, Kentaro, Ninkovic, Jelena, Noori Shirazi, Amir, Ogawa, Tomohisa, Okamura, Takahiro, Omori, Tsunehiko, Ono, Hiroaki, Ootani, Wataru, Oskarsson, Anders, Östermann, Lennart, Ouyang, Qun, Pöschl, Roman, Parraud, Jean-Marc, Pawlik, Bogdan, Pellegrini, Giulio, Perello, Martin, Perez, Alejandro, Pham, Hung, Piedrafita, Javier, Pierre-Emile, Thomas, Pingault, Antoine, Pinto, Olin Lyod, Polák, Ivo, Popova, Elena, Poulose, Poulose, Pradas, Alvaro, Prahl, Volker, Price, Tony, Provenza, Ambra, Puerta Pelayo, Jesús, Qi, Huirong, Radkhorrami, Yasser, Raux, Ludovic, Raven, Gerhard, Reinecke, Mathias, Richard, Francois, Richter, Rainer, Riemann, Sabine, Robles Manzano, Maria Soledad, Rogan, Christopher, Rolph, Jack, Ros, Eduardo, Rosmanitz, Anna, Royon, Christophe, Ruan, Manqi, Ruiz-Jimeno, Alberto, Sanuki, Tomoyuki, Sasikumar, Swathi Kollassery, Sato, Yo, Saveliev, Andrey, Saveliev, Valery, Schäfer, Oliver, Schmitt, Christian, Schneekloth, Uwe, Schörner-Sadenius, Thomas, Schultz-Coulon, Hans-Christian, Schuwalow, Sergej, Sefkow, Felix, Seguin-Moreau, Nathalie, Sekiya, Izumi, Settles, Ronald, Shekhtman, L., Shen, Wei, Shiraz, Ryousuke, Shoji, Aiko, Simon, Frank, Sinram, Klaus, Smiljanic, Ivan, Specht, Matthieu, Stromhagen, Richard, Sudo, Yuji, Suehara, Taikan, Sugimoto, Yasuhiro, Sugiyama, Akira, Swientek, Krzysztof, Takahashi, Tohru, Takeshita, Tohru, Tamaya, Yukinaru, Tanabe, Tomohiko, Tauchi, Toshiaki, Telnov, Valery, Terlecki, Pzremyslaw, Thiebault, Alice, Tian, Junping, Timmermans, Jan, Titov, Maxim, Tran, Huong Lan, Tread, Reima, Tsionou, Dimitra, Tsuji, Naoki, Tuchming, Boris, Tytgat, Michael, Ueno, Takayuki, Uesugi, Yuto, Uozumi, Satoru, Valin, Isabelle, Vallée, Claude, Verdugo De Osa, Antonio, Vidal, Guillem, Videau, Henri, Vila, Iván, Villarrejo, Miguel Angel, Volkov, Denis, Vos, Marcel, Vukasinovic, Natasa, Wang, Yan, Watanabe, Takashi, Watson, Nigel, Werthenbach, Ulrich, Wilson, Graham W, Wing, Matthew, Winter, Alasdair, Winter, Marc, Wojtoń, Tomasz, Yamamoto, Hitoshi, Yamashita, Satoru, Yonamine, Ryo, Yoshioka, Tamaki, Yu, Boxiang, Yu, Dan, Yuan, Zhenxiong, Yumino, Keita, Zarnecki, Aleksander Filip, Zeitnitz, Christian, Zerwas, Dirk, Zhao, Hang, Zhao, Jingzhou, Zhao, Ruiguang, Zhao, Yüe, Zhu, Hongbo, and Zutshi, Vishnu

Subjects
detector: technology, electron positron, Physics::Instrumentation and Detectors, ILD detector, Physics::Accelerator Physics, costs, interface, High Energy Physics::Experiment, 7. Clean energy, ILC Coll, performance
Abstract

The ILD detector is proposed for an electron-positron collider with collision centre-of-mass energies from 90~\GeV~to about 1~\TeV. It has been developed over the last 10 years by an international team of scientists with the goal to design and eventually propose a fully integrated detector, primarily for the International Linear Collider, ILC. In this report the fundamental ideas and concepts behind the ILD detector are discussed and the technologies needed for the realisation of the detector are reviewed. The document starts with a short review of the science goals of the ILC, and how the goals can be achieved today with the detector technologies at hand. After a discussion of the ILC and the environment in which the experiment will take place, the detector is described in more detail, including the status of the development of the technologies foreseen for each subdetector. The integration of the different sub-systems into an integrated detector is discussed, as is the interface between the detector and the collider. This is followed by a concise summary of the benchmarking which has been performed in order to find an optimal balance between performance and cost. To the end the costing methodology used by ILD is presented, and an updated cost estimate for the detector is presented. The report closes with a summary of the current status and of planned future actions.

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